2024-03-28T22:05:59Z
https://jurnal.ugm.ac.id/jag/oai
oai:jurnal.ugm.ac.id:article/6674
2020-12-29T07:45:47Z
jag:ART
Origin of the Late Paleozoic metamorphic rocks in East Johor, Peninsular Malaysia
Surjono, Sugeng Sapto
Leman, Shafeea
Low grade metamorphic rocks including slate, phyllite, metasandstone with subordinate schist and quartzite are widely distributed in the East Johor, Peninsular Malaysia. Regionally, this rock unit is extended northward up to northern Terengganu area. The protolith of this rocks unit were deposited in shallow marine depositional environment that subsequently metamorphosed during Carboniferous time. The very thick argillaceous and arenaceous rocks more than 5000 metres were produced by fast rate accommodation spaces due to global sea level rise during Early to Late Carboniferous against with high fine-grained sediment supply. Tectonic setting, basin formation and sedimentation processes were controlled by rifting of Indochina-East Malaya continental block from Gondwanaland during Devonian to Late Carboniferous. This rifting formed basins within a passive margin tectonic setting along the western margin of Indochina-East Malaya continental block.Keywords: Metamorphic rocks, shallow marine, Carboniferous, passive margin
Geological Engineering Department Universitas Gadjah Mada
2015-07-12
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/6674
10.22146/jag.6674
Journal of Applied Geology; Vol 2, No 2 (2010)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/6674/5221
Copyright (c) 2015 Sugeng Sapto Surjono, Shafeea Leman
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oai:jurnal.ugm.ac.id:article/7182
2018-01-15T03:32:04Z
jag:ART
Characteristics and genesis of montmorilonitic claystone from Bandung area, Wonosegoro, Boyolali, Central Java, Indonesia
Yuliyanti, Anita
Warmada, I Wayan
Titisari, Anastasia Dewi
The Bandung bentonite deposit is located in Wonosegoro District, Boyolali Regence, Central Java. Characteristics of bentonite in this area are very important due to increase demand on bentonite in the industry. Several methods are used to characterize the bentonite in this area, such as PLM (polarizing light microscope), X-Ray Diffraction and Scanning Electron Microscope combined with EDX measurements. The montmorilonitic claystone belongs to Kerek Formation from Banyuurip Member. This deposit consists of mainly montmorilonitic claystone interbedded with tuffaceous sandstone. Petrographical analysis shows that montmorilonitic claystone consists of mostly clay minerals with small amount of calcite, volcanic glass, feldspar, quartz, and opaque minerals. The clay minerals are likely as alteration product of volcanic glass. The oriented XRD analyses show that the clay samples consist of Ca-montmorilonite, illite, and kaolinite. Physico-chemical analyses of montmorilonitic claystone display that the initial CEC (cation exchange capacity) is 20 mgrek.Na2O/200gr (54 mg.Na2O/100gr) and low swelling ability for about 2 times of its initial volume. Based on its mineralogical association, textures, and stratigraphic position, the montmorilonite is formed from devitivication of volcanic glass in a diagenetic environment with over 2 km thicks of overburden. Keywords: Bentonite, montmorillonitic claystone, devitrivication, diagenesis, montmorillonite
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7182
10.22146/jag.7182
Journal of Applied Geology; Vol 3, No 1 (2011)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7182/5622
Copyright (c) 2015 Anita Yuliyanti, I Wayan Warmada, Anastasia Dewi Titisari
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oai:jurnal.ugm.ac.id:article/7191
2018-01-19T00:58:50Z
jag:ART
ORE MINERALOGY AND MINERAL CHEMISTRY OF PYRITE, GALENA, AND SPHALERITE AT SORIPESA PROSPECT AREA, SUMBAWA ISLAND, INDONESIA
Kant, Win
Warmada, I Wayan
Idrus, Arifudin
Setijadji, Lucas Donny
Watanabe, Koichiro
The Soripesa prospect area is located at Maria village, Wawo district, Bima region in the East Sumbawa Island, Indonesia. Lithology is dominantly composed of a lithic-crystal tuff of andesitic and dacitic composition and bedded limestone. The polymetallic epithermal quartz veins are hosted by andesitic volcaniclastic rocks. Within these veins, multiphases, colloform-crustiform, bedding to massive textures with pyrite, sphalerite, galena, chalcopyrite, chalcocite, azurite, and malachite are observed. Selected samples were analyzed by using ore microscopy and SEM-EDX. Ore minerals show replacement, ex-solution, colloform, and zonal textures. The paragenesis diagram was made from a careful study of polished sections and thin sections. Textures of ore minerals such as banded, exsolution, replacement, and zone, have been interpreted to correspond to the order of deposition. In pyrite, the average content of Co (0.45 wt.%) is higher than Ni content (0.14 wt.%) and it means that their origin may be hydrothermal origin. Average content ratio, Co:Ni is 2.81. Galena shows a low Ag content of 0.07 %in average. But they show a high Au content of 1.48 %in average. Sphalerite shows a low Fe content of 1.04 %in average and occasionally chalcopyrite inclusion/disease also occurred. Ga and Ge contents are also high in sphalerite. Co>Ni in pyrite, low content of Ag in Galena, low content of Fe and mole % FeS in sphalerite, high content of Ga and Ge, and log (Ga/Ge) in sphalerite, show that pyrite, galena, and sphalerite from Soripesa prospect area were formed under low temperature condition of hydrothermal fluid. Keywords: Ore textures, paragenesis, deposition, hydrothermal fluid, low temperature
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7191
10.22146/jag.7191
Journal of Applied Geology; Vol 4, No 1 (2012)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7191/5630
Copyright (c) 2015 Win Kant, I Wayan Warmada, Arifudin Idrus, Lucas Donny Setijadji, Koichiro Watanabe
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7192
2018-01-19T00:55:47Z
jag:ART
COASTAL AQUIFER GROUNDWATER MODELING IN THE SOUTHERN PART OF YOGYAKARTA AREA, INDONESIA
Rata, Doung
Eka Putra, Doni Prakasa
Hendrayana, Heru
Parangtritis beach, located in a coastal aquifer at the southern part of Yogyakarta Province, Indonesia is bounded by the Indian Ocean at the South, Opak River at the West, and Tertiary Limestone Rock to the East. Local land-use is predominantly agriculture, rice fields and settlements and the population is estimated to be 9,386 persons as per the 2012 census. The total surface area is estimated at 9.46 km2. The aims of this research were to understand the system of groundwater and to assess and predict saltwater intrusion by conducting a numerical groundwater model. Hydrological and hydrogeological data were collected directly from the field and from previous work for input into the model. The model simulates an unconfined aquifer system where the aquifer thickness varies from 30-40 meters. The material of the aquifer consists of sand varying from fine to coarse grain size and fine gravel with hydraulic conductivity values of 8.974 × 10−4, 1.794 × 10−3, and 1.337 × 10−3 m/s at the northern, central, and southern part of the research area, respectively. The maximum length of the saltwater interface was estimated at about 205.1 m laterally and 40 m vertically relative to the location of the groundwater table around 1m above sea level. Direction of groundwater flow is from north to south. Groundwater table elevation equals 5 m at the north and 0 m at the south with a hydraulic gradient estimated at about 2.45 × 10−3. As a result of a steady-state simulation as well as two cases of prediction for five and ten years in the future, it is determined that that the salinity of the surrounding environment is not potentially adverse to the groundwater quality in the study area. This is in part due to low population in this area and abundant groundwater resources, as well as the results of the groundwater model. Keywords: Coastal aquifer, numerical groundwater model, conceptual model, observed heads
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7192
10.22146/jag.7192
Journal of Applied Geology; Vol 4, No 1 (2012)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7192/5631
Copyright (c) 2015 Doung Rata, Doni Prakasa Eka Putra, Heru Hendrayana
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oai:jurnal.ugm.ac.id:article/7193
2018-01-19T00:59:46Z
jag:ART
Removal Of Copper From Water Using Columns Experiment Of Lignite, Shale, And Ironsand
Boreborey, Ty
Wilopo, Wahyu
Eka Putra, Doni Prakasa
Experimental studies using column testing of lignite, shale, and ironsand in copper solution were carried out to determine the adsorption capacity of lignite, shale, and ironsand in remediation of water contaminated with copper. Lignite, shale, and ironsand were analyzed using XRD, SEM/EDX, and XRF. The treatment process by column adsorption was carried out over a period of 24 hours at a stable velocity of 0.005ml/s. After treatment, the remaining copper in the solution was recorded, thus allowing the adsorption capacity of lignite, shale, and ironsand to be calculated. The results revealed that when the solution was treated by lignite and shale there was a good degree of copper removal, while the ironsand had very poor degree of copper removal. The best material for copper removal was lignite with 25-mesh grain size. Pyrite, graphite, calcite, and illite were found in lignite and smectite, calcite, pyrite, hematite, and illite were found in shale. These materials were also shown to contain an abundance of high-valence elements in Al2O3, SiO2, and Fe3O4 which contributes to additional adsorption capacity. CAC values for lignite and shale reached nearly to 100%, suggesting that lignite and shale have a high adsorption capacity. In contrast, ironsand, which has mostly sand minerals with little clay and organic content, caused the pollutant to move rapidly to the water table, reducing the adsorption potential. CAC values treated by ironsand were shown to be negative which showed an increasing of Cu2+ in natural ironsand into solution. Keywords: Copper, ironsand, shale, lignite, column experiment
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7193
10.22146/jag.7193
Journal of Applied Geology; Vol 4, No 1 (2012)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7193/5632
Copyright (c) 2015 Ty Boreborey, Wahyu Wilopo, Doni Prakasa Eka Putra
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7194
2018-01-19T01:01:04Z
jag:ART
Kinetic And Equilibrium Studies On The Adsorption Of Pb2+ And Zn2+ From Aqueous Solution Using Coco-Peat By Batch Experiment
Waskita, Kukuh Jalu
C. Resurreccion, Augustus
Budianta, Wawan
The presence of heavy metals in surface water, which is common in mining area pose harmful effect to human health and the environment. Recently, cocopeat has been studied as an effective sorbent material for removing heavy metals from wastewater. In this study, kinetic was done by analyzing the distribution of the heavy metal in sorbent material and liquid phase after mixing 50 mg/L solution of lead (Pb2+) and zinc (Zn2+)in single solute system with 0.1 g of coco-peat, that were consequently shaken at 5, 10, 15, 30, 60, 120, 180 and 360 minutes. To determine the equilibrium adsorption isotherm for each heavy metal, the solutions of 10, 20, 30,40 and 50 mg/L of Pb2+ and Zn2+ were prepared separately. Two different pH levels (natural pH, and pH 4) were setto describe the sorption behavior of Pb2+ and Zn2+ of each heavy metal.Using data from batch experiments, appropriate kinetic (time dependency) and equilibrium (isotherm) models were fitted on the sorbent material and liquid phase concentrations to determine adsorption parameters. Pseudo second-order kinetic model fitted well to the kinetic data due to chemisorption that happened during experiments. In other hand, Langmuir model fitted well to the equilibrium, this indicates that the sorption of lead and zinc on coco peat is monolayer and that the adsorbent’s surface is homogenous. The increase of heavy metals adsorption following the increase of pH might be due to negative charge of coco peat surface. Pb2+ adsorbed more than Zn2+ because ion with high hydration enthalpy will have smaller amount of ion adsorbed. The hydration enthalpies for Pb2+ and Zn2+ are 23 kJ/kg and 113 kJ/kg, receptively. Considering all the factors that we have discussed, cocopeat has high efficiency to remove the heavy metals from wastewater. Keywords: Coco-peat, adsorption, batch experiment, kinetic, equilibrium.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7194
10.22146/jag.7194
Journal of Applied Geology; Vol 4, No 1 (2012)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7194/5633
Copyright (c) 2015 Kukuh Jalu Waskita, Augustus C. Resurreccion, Wawan Budianta
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7195
2018-01-19T01:02:15Z
jag:ART
Removal Of Lead (Pb2+) From Aqueous Solutions By Natural Bentonite
Wilopo, Wahyu
Eka Putra, Doni Prakasa
Warmada, I Wayan
Hirajima, Tsuyoshi
The aim of the present work is to investigate the ability of natural bentonite (untreated) from Pacitan, East Java to remove lead ions from aqueous solution. The bentonite has specific surface area and cation exchange capacity of 27.52 m2 g−1 and 65.20 meq/100 gr of bentonite, respectively. Towards this aim, batch adsorption experiments were carried out and the effect of various parameters on this removal process has been investigated. The effects of pH, grain size of bentonite, adsorption time and lead ion concentration on the adsorption process were examined. The optimum pH for adsorption was found to be 9, with the finer grain size of bentonite is more effective. In adsorption studies, residual lead ions concentration reached equilibrium in a duration of 24 hours. Adsorption of lead on bentonite appeared to follow Freundlich isotherm. Our results demonstrate that the adsorption process was mostly dominated by ion exchange process. Keywords: Removal, lead, aqueous solution, natural bentonite, adsorption.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7195
10.22146/jag.7195
Journal of Applied Geology; Vol 4, No 1 (2012)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7195/5634
Copyright (c) 2015 Wahyu Wilopo, Doni Prakasa Eka Putra, I Wayan Warmada, Tsuyoshi Hirajima
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oai:jurnal.ugm.ac.id:article/7196
2018-01-19T01:02:59Z
jag:ART
Regional Depositional Model Of South Makassar Basin Depocenter, Makassar Strait, Based On Seismic Facies
Hidayat, Rahmadi
Husein, Salahuddin
Surjono, Sugeng Sapto
South Makassar Basin Depocenter (SMBD) is located in Southern Makassar Strait which has petroleum potential by the presence of oil and gas indications within the area based on Airborne Laser Fluorescence survey. However, detail studies within this area are not developed well. One of the studies which can be utilized for further discoveries of oil and gas field in SMBD is a study of depositional model using seismic facies method to maximize limited seismic and well data. Interpretation of depositional model in Eocene (syn-rift phase) was varied from alluvial plain and alluvial fan complex, continued gradually to platform. In Oligocene time (post-rift phase), massive transgression caused a major deepening in entire SMBD where the depositional environment changed to basinal plain. In early Miocene – recent interval (syn-orogenic phase), SMBD was relatively in stable condition at basinal plain environment. Lower Tanjung Sequence will be the most prolific petroleum play in SMBD due to its adequate source rock, reservoir rock and seal rock as well. Keywords: South Makassar basin, depositional model, seismic facies
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7196
10.22146/jag.7196
Journal of Applied Geology; Vol 4, No 1 (2012)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7196/5635
Copyright (c) 2015 Rahmadi Hidayat, Salahuddin Husein, Sugeng Sapto Surjono
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oai:jurnal.ugm.ac.id:article/7197
2018-03-02T01:56:48Z
jag:ART
Batch Studies On Arsenic Adsorption Onto Lignite, Bentonite, Shale And Iron Sand: Effects Of Ph, Time, Particle Size And Sulfate Concentration
Kyu Mar, Kyu
Karnawati, Dwikorita
Eka Putra, Doni Prakasa
Sarto, Sarto
Igarashi, Toshifumi
Tabelin, Carlito Baltazar
Arsenic (As) is a toxic element found in both natural and anthropogenic sources. High concentration of this element was recently uncovered in the groundwater of Sumbawa Island, Indonesia. To mitigate this problem, As adsorption potential of natural geological materials like lignite, bentonite, shale, and iron sand obtained in Indonesia were evaluated by batch experiments. Arsenic adsorption onto these materials was investigated as a function of solution pH, particle sizes of adsorbents and coexisting sulfate concentration. In addition, batch leaching experiments were performed to elucidate the stability of geogenic As present in all adsorbents at different pHs. The results showed that among these natural materials tested, lignite was the most effective adsorbent of As(V) followed by bentonite, shale and then iron sand, and that the amounts of As(III) adsorbed onto all adsorbents were lower than those of As(V).This indicates that As(III) is more mobile in comparison to As(V). The adsorption isotherms of As(III) and As(V) conformed to nonlinear types, either Langmuir or Freundlich. It was found that adsorption of As onto these natural adsorbents was pH-dependent. This could be attributed to the changes in the surface charges of the adsorbents with pH. With respect to the adsorbent particle size, the amount adsorbed somewhat increased with decreasing particle size, which could be explained by the larger surface area of the smaller particles. Acidic (pH < 6) and alkaline (pH >10) conditions destabilized the geogenic As content of the adsorbents, indicating that the effectiveness of these natural materials as adsorbents is greatly limited by the pH of the contaminated system. Keywords: Adsorption, arsenic, natural geological materials, particle size, pH
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7197
10.22146/jag.7197
Journal of Applied Geology; Vol 4, No 2 (2012)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7197/5636
Copyright (c) 2015 Kyu Kyu Mar, Dwikorita Karnawati, Doni Prakasa Eka Putra, Sarto Sarto, Toshifumi Igarashi, Carlito Baltazar Tabelin
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oai:jurnal.ugm.ac.id:article/7198
2018-03-02T01:58:37Z
jag:ART
Copper Mobility Assessment Using Speciation Schemes: Case Study–Mantrijeron District, Yogyakarta, Indonesia
Xaixongdeth, Phetnakhone
Hendrayana, Heru
Eka Putra, Doni Prakasa
Karnawati, Dwikorita
Sato, Tsutomu
factors such physical and chemical properties, especially mineralogical composition of such environment. This study focused on the mineralogical of two soils types (fine sandy loam and loamy fine sand) to retain/mobile Cu. Two non contaminated soils from Yogyakarta urban area, Indonesia, were artificially contaminated with Cu solution. Subsequently, soils artificially contaminated were extracted from various geochemical phases of soil by sequential extraction procedure. The results show that both of soils types can retain Cu well with maximum is 5.8 mg/g of loamy fine sand and 3.9mg/g of fine sandy loam. Additionally, the iron amorphous phase content in clay fraction is influence Cu retains in these soils. This is advantage in environment of Yogyakarta urban area, Indonesia, where this area underlain by loamy sand soil. Keywords: Copper, mobility, iron, sequential extraction.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7198
10.22146/jag.7198
Journal of Applied Geology; Vol 4, No 2 (2012)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7198/5637
Copyright (c) 2015 Phetnakhone Xaixongdeth, Heru Hendrayana, Doni Prakasa Eka Putra, Dwikorita Karnawati, Tsutomu Sato
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oai:jurnal.ugm.ac.id:article/7199
2018-03-02T02:00:50Z
jag:ART
Fluid Inclusion Study Of The Polymetallic Epithermal Quartz Veins At Soripesa Prospect Area, Sumbawa Island, Indonesia
Kant, Win
Warmada, I Wayan
Idrus, Arifudin
Setijadji, Lucas Donny
Watanabe, Koichiro
The Soripesa prospect area is located at Maria village, Wawo district, Bima region in the eastern part of Sumbawa Island, Indonesia. This area is a part of Cenozoic Calc-alkaline volcanic inner Banda-Sunda Arc. The dominant lithology of Soripesa prospect area are a lithic-crystal tuff of andesitic and dacitic composition and bedded limestone. There have five main polymetallic epithermal quartz veins in the Soripesa prospect area, namely, Rini vein, Jambu air vein, Dollah vein, Merpati vein, and Arif vein. Those quartz veins are hosted mainly in andesitic volcaniclastic rocks. Fluid inclusion study on those quartz veins is vey important to know the condition of hydrothermal fluids and their origin. Fluid inclusion study is conducted at the laboratory of Earth Resources Engineering Department, Kyushu University, Japan. Homogenization temperature, freeze temperature, eutectic temperature, and melting temperature can be known from fluid inclusion study. Based on fluid inclusion study, formation temperatures of all veins are between 250–260◦C. Melting temperature is between -0.2 to -3◦C. Based on the melting temperature, salinity (wt.% NaCl equiv.) of fluid inclusions is calculated by using Bodnar’s equation. Paleodepth of formations and pressure of trapping are also estimated by using formation temperature and salinity. Based on Hass (1971) diagram, estimated paleodepths of formations are 270 m for Merpati vein, 400 m for Dollah vein, 480 m for Rini vein, 570 m for Arif vein, and 680 m for Jambu Air vein, respectively. Pressure of trapping can also be estimated from depth of formation, density of lithostatic overburden, and gravity; 72 bars for Merpati vein, 106 bars for Dollah vein, 127 bars for Rini vein, 151 bars for Arif vien, and 180 bars for Jambu Air vein, respectively. Keywords: Soripesa, polymetallic quartz veins, homogenization temperature, salinity.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7199
10.22146/jag.7199
Journal of Applied Geology; Vol 4, No 2 (2012)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7199/5638
Copyright (c) 2015 Win Kant, I Wayan Warmada, Arifudin Idrus, Lucas Donny Setijadji, Koichiro Watanabe
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7200
2018-03-02T02:01:18Z
jag:ART
Lead Contamination In Soil Of Yogyakarta City, Indonesia
Budianta, Wawan
This paper investigates on Pb concentrations and mobility in soil of overall Yogyakarta City, Indonesia. The objectives of this study include to investigate Pb concentrations in the surface soil throughout Yogyakarta and to study their possible sources and potential environmental impacts. The soil samples from 168 locations in Yogyakarta was obtained, representing different land use and traffic conditions. Spatial analysis and sequential extraction analysis were performed. Generally, contour pattern of Pb value clearly shows that high value is concentrated in the middle and few north part of the study area, confirmed by traffic condition in the study area. In general, the results of sequential extraction analysis shows that Pb was predominantly associated with exchangeable fraction. The presence of lead in the exchangeable fractions may pose a serious environmental concern since they are highly soluble and potentially bio-available in the soil of study area. Keywords: Soil, lead contamination, GIS, sequential extraction.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7200
10.22146/jag.7200
Journal of Applied Geology; Vol 4, No 2 (2012)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7200/5639
Copyright (c) 2015 Wawan Budianta
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oai:jurnal.ugm.ac.id:article/7201
2018-03-02T02:01:48Z
jag:ART
Paleogeography And Sedimentation Dynamics Of Ujoh Bilang-Batubelah Limestone Member, Upstream Mahakam River, Ujoh Bilang Area, East Kalimantan Province
Novian, Indra
Kusuma Wijayanti, Herning Dyah
-
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7201
10.22146/jag.7201
Journal of Applied Geology; Vol 4, No 2 (2012)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7201/5640
Copyright (c) 2015 Indra Novian, Herning Dyah Kusuma Wijayanti
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oai:jurnal.ugm.ac.id:article/7202
2018-03-02T01:44:18Z
jag:ART
SITE RESPONSE CHARACTERISTICS OF H/V SPECTRUM BY MICROTREMOR SINGLE STATION OBSERVATIONS AT PALU CITY, INDONESIA
Thein, Pyi Soe
Pramumijoyo, Subagyo
Brotopuspito, Kirbani Sri
Wilopo, Wahyu
Kiyono, Junji
Setianto, Agung
In this study, we estimated predominant period of an H/V spectrum in Palu City, Indonesia, by using microtremor single station observations. Sulawesi Island, eastern Indonesia, is located at the junction between the converging Pacific-Philippine, Indo- Australian Plates and the Eurasian Plate. One of the major structures in Central Sulawesi is the Palu- Koro Fault system, which extends NNW-SSE direction and cross-cuts Sulawesi along more than 300 km from the North Sulawesi trench passing southward through Palu Bay then turn to the southeast, connecting to the Matano and Lawanopo Faults and further eastward both faults join to Tolo trench. Several earthquakes have been known along Palu-Koro Fault system such as Gimpu earthquake (1905), Kulawi earthquake (1907), Kantewu earthquake (1934), and offshore Donggala earthquake (1968) which caused tsunami that destroyed 800 houses and killed 200 people at Donggala district. Palu City, located at the northern tip of Palu depression, is a capital of the Central Sulawesi Province. It is located in the active seismic zone of the Palu-Koro fault. Spectral ratios for horizontal and vertical motion (H/V) from single-station microtremor records were used to identify the predominant periods of the ground vi- brations. Understanding the parameters of predominant period[s] and seismichazard is important for mitigation and environmental planning of the Palu region. Keywords: H/V spectrum, predominant period[s], microtremor single station observation
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7202
10.22146/jag.7202
Journal of Applied Geology; Vol 5, No 1 (2013)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7202/5641
Copyright (c) 2015 Pyi Soe Thein, Subagyo Pramumijoyo, Kirbani Sri Brotopuspito, Wahyu Wilopo, Junji Kiyono, Agung Setianto
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7203
2018-03-02T01:46:29Z
jag:ART
GROUND MOTION IN YOGYAKARTA CITY, YOGYAKARTA SPECIAL PROVINCE, INDONESIA ON DENSELY MICROTREMOR OBSERVATIONS AND SHEAR WAVE VELOCITY
Kyaw, Zaw Lin
Pramumijoyo, Subagyo
Husein, Salahuddin
Fathani, Teuku Faisal
Kiyono, Junji
Microtremor is currently considered the foremost tool in site effect studies. The ground motion is estimated with microtremor observations, meaning that subsoil mechanical properties and geometry are evaluated and from them an estimate of local amplification is computed. Here, the ground motion is studied by the site effects of seismic hazard zonation of urban areas in Yogyakarta City. The main purpose of this paper is zoning the geological engineering features and assessing seismic of the research urban area. In this regard, the microtremors are measured at 274 sites by single station sampling method and Nakamura technique. The microtremors of all over the city are processed by a model of Mitutoyo-GPL-6A3P. The amplification factor generally ranges between 0.70 and 5.56 and the natural frequency normally varies between 0.40 and 3.30 Hz. The information layers are prepared in GMT used for detecting the zonation of potential seismic hazard. The shear wave velocity is calculated in 12 existing drilling sites based on the geotechnical approach of SPT for soil condition. To study the ground motion, geological engineering condition is investigated using amplification factor, natural frequency, shear wave velocity maps which are analyzed using densely single microtremor observation and SPT from existing drilling sites. Keywords: Ground motion, amplification factors, natural frequency; H/V spectral ratio, microtremor observations, Yogyakarta Urban
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7203
10.22146/jag.7203
Journal of Applied Geology; Vol 5, No 1 (2013)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7203/5642
Copyright (c) 2015 Zaw Lin Kyaw, Subagyo Pramumijoyo, Salahuddin Husein, Teuku Faisal Fathani, Junji Kiyono
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7204
2018-03-02T01:47:39Z
jag:ART
COMPARISON OF KRIGING AND INVERSE DISTANCE WEIGHTED (IDW) INTERPOLATION METHODS IN LINEAMENT EXTRACTION AND ANALYSIS
Setianto, Agung
Triandini, Tamia
Analysis that is based on geostatistics eliminates many corresponding defects and limitations compared to classical statistics which have been developed by random distribution theory of processes and variables. Interpolation is important for local analysis by GIS, because many maps used for GIS operation are made by interpolation. In this research, two different methods which is Kriging method and Inverse Distance Weighted (IDW) method was examined for developing Digital Elevation Model image. Each method’s advantages and disadvantages were considered. The study are, Kepil, is within Kulon Progo physiographic and stratigraphic area, located in the western part of Yogyakarta city. This area is located close to the Java Island Subduction Zone, hence influence of tectonic plate movement is relatively dominant. Geological structures become a main factor that shapes the recent morphology. This study area also has many settlements and has high weathering and erosion rate. Lineaments are extracted based on Digital Elevation Model to provide assistance in delineating geological structures. The structural geology analysis and an understanding of tectonic phase of the area provide useful information for geological map- ping. Accuracy of lineament depends on extraction and imagery parameters used. In this study, the extraction was conducted by two different raster methods, namely Kriging and Inverse Distance Weighted (IDW) with the same resolution of 30 meters. Lineament extracted automatically (digitally) with certain parameter settings. Keywords: Kriging, inverse distance weighted, interpolation, lineament, random distribution, digital elevation model.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7204
10.22146/jag.7204
Journal of Applied Geology; Vol 5, No 1 (2013)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7204/5643
Copyright (c) 2015 Agung Setianto, Tamia Triandini
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7205
2018-03-02T01:49:06Z
jag:ART
HOST ROCKS’ GEOCHEMISTRY AND MINERALIZATION POTENTIAL OF POLYMETALLIC EPITHERMAL QUARTZ VEINS AT SORIPESA PROSPECT AREA, SUMBAWA ISLAND, INDONESIA
Khant, Win
Warmada, I Wayan
Idrus, Arifudin
Setijadji, Lucas Donny
Watanabe, Koichiro
The Soripesa prospect area is located at Maria village, Wawo district, Bima region in the eastern part of Sumbawa Island, Indonesia. This area is a part of Cenozoic Calc-alkaline volcanic inner Banda- Sunda Arc. There are five main polymetallic epithermal quartz veins in the Soripesa prospect area, namely, Rini vein, Jambu air vein, Dollah vein,Merpati vein, and Arif vein. The dominant lithology is a lithic-crystal tuff of andesitic and dacitic composition and bedded limestone. Major oxides and trace elements were analyzed by using X-Ray Fluorescence (XRF) to identify the host rock geochemistry. The main veins are hosted by andesitic and andesitic/ basaltic volcanic host rocks. Major elements compositions are affected by alteration. Based on the trace element data, host rocks of all veins were formed in the volcanic arc basalt (VAB) and island arc basalt (IAB) tectonic settings. Host rocks of Rini vein contain higher amount of precious and base metal elements (Zn, Cu, Pb, and Ag.etc.) than those of other host rocks. Keywords: Soripesa prospect area, lithology, tectonic setting, mineralization.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7205
10.22146/jag.7205
Journal of Applied Geology; Vol 5, No 1 (2013)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7205/5644
Copyright (c) 2015 Win Khant, I Wayan Warmada, Arifudin Idrus, Lucas Donny Setijadji, Koichiro Watanabe
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7206
2018-03-02T01:50:23Z
jag:ART
ASSESSMENT OF OPTIMUM YIELD OF GROUNDWATER WITHDRAWAL IN THE YOGYAKARTA CITY, INDONESIA
Eka Putra, Doni Prakasa
Iqbal, Muhammad
Hendrayana, Heru
Putranto, Thomas Triadi
The high demand of clean water supply and groundwater usages in Yogyakarta City, Indonesia has caused the lowering of groundwater table of about 3 m in average since 1984. This condition is caused by the increase number of groundwater pumping in this city relate to the rising of the urban population, economics condition, education and cultural activities, change of land use and increase number of hotels on this famous tourism city in Indonesia. Therefore, it became necessary to assess the optimum yield from the groundwater system beneath this city which can still preserve the recent level of shallow groundwater. This is important because most of the people in this city depends their daily water supply from shallow dug well. In order to assess the safe yield, a groundwater modeling is conducted. The data used on this modeling was taken from previous research and also primary data collected during this research such as; aquifer geometry, aquifer characteristics, shallow groundwater level, water usage/pumping wells discharge, river discharge and surface water level, and climate data. Prediction of the impact of groundwater pumping was made by increasing the water usage/pumping wells discharge on several scenarios. The result of this modeling shows that the optimum yield of the aquifer beneath Yogyakarta City area is about 125,000 m3/day. Keywords: Optimum yield, groundwater usage, groundwater table, pumping, urban population, shallow dug well.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7206
10.22146/jag.7206
Journal of Applied Geology; Vol 5, No 1 (2013)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7206/5645
Copyright (c) 2015 Doni Prakasa Eka Putra, Muhammad Iqbal, Heru Hendrayana, Thomas Triadi Putranto
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7207
2018-03-02T01:52:43Z
jag:ART
IMPROVEMENT OF EXPANSIVE SOIL BY ELECTRO-KINETIC METHOD
Thanh Thuy, Tran Thi
Eka Putra, Doni Prakasa
Budianta, Wawan
Hazarika, Hemanta
The roadway in Karangjati, Ngawi Regency, East Java, Indonesia, which is underlain by expansive soil, is susceptible to damage due to volume change. This research aims to improve the engineering properties, such as consistency limits, compressibility, and undrained shear strength of the montmorillonite dominated soil in this area using an electrokinetic stabilization method. Four electro-kinetic experiments were conducted using different electrolytes (calcium chloride or pure water) under different conditions (no-flow or flow water). The results show that, pH values of all soil samples decreased at anolyte and increased at catholyte. Atterberg limits of the soil samples were found to increase, where the liquid limit (LL) range of 79.72– 86.14%, plastic limit (PL) 25.22–30.80%, and plasticity index (PI) 53.28–60.92, liquidity Index (LI) 0.91–1.08. The compression index Cc was 0.50– 0.742. Undrained shear strength of treated soil range of 7–11 kPa. Moreover, strengthening degree of the treated soils achieve 304–556%. The soil improvement was achieved by decreasing the Atterberg limits, and compressibility and increasing the undrained shear strength. Applying calcium chloride and flow water condition were the most effective methods for the soil improvement. The mineralogical compositions of the soil samples did not change after the treatment. Keywords: Electro-kinetic stabilization, electro chemical injection, clayey soil improvement.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7207
10.22146/jag.7207
Journal of Applied Geology; Vol 5, No 1 (2013)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7207/5646
Copyright (c) 2015 Tran Thi Thanh Thuy, Doni Prakasa Eka Putra, Wawan Budianta, Hemanta Hazarika
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7208
2018-03-02T01:41:24Z
jag:ART
Determination of suitable groundwater quality for agriculture by using GIS application in Bantul Regency, Yogyakarta Special Province, Indonesia
Kong, Chhuon
Hendrayana, Heru
Setianto, Agung
irrigation purposes within Bantul area which is located on Yogyakarta Volcanic Groundwater Basin, 47 existing data points were used complementary with the results of 30 groundwater samples analysis which were collected from dug and tub wells in various locations of study area. ECw, TDS, pH and major cations: Na+, Ca2+, Mg2+, K+,and anions: Cl, HCO 3 , SO2 4 , NO 3 were analyzed as evaluation index. The relative tendency of ion in epm shows Ca2+>K+>Na+>Mg2+ and HCO 3 >Cl>SO2 4 . Variations in groundwater composition by using Mg/Ca vs. Na/Ca molar ratio indicates that the groundwater is close to silicate rock with influence of clastic carbonate rock. Higher salinity approach to the west of the Bantul indicates that groundwater quality is controlled by clastic carbonate rock and expose limestone of Sentolo hills. Groundwater samples fall under class I suggested that groundwater is good and suitable for irrigation based on Doneen’s classification of permeability index and 78.37% is in excellent category by Wilcox classification on N%. According to the SAR values plotted in the USSL diagram, the majority of the groundwater samples belong to C2-S1 and C2-S2 class, indicating medium salinity and low sodium water which can be used for irrigation with little danger. The suitability of groundwater quality for agriculture is determined by thematic maps produced from ArcGIS Spatial Analyst based on FAO guideline. Salinity is the significant problem that has slight to moderate restriction effect on crops productivities in this area. The ECw map indicates that good groundwater quality for crops is at the middle to the east of study area close to Opak River, while at the western irrigation water is affected but yielding no reduction on rice productivity. However, it has slight to moderate restriction on sensitive crops indicated in thematic map of crops land with different yield potential. The agricultural land in which has yield potential of 100%, 90% and 75% is about 2727.90 ha (38.56%), 735.49 ha (10.39%) and 208.98 ha (2.95%) of the study area respectively. Key words: Irrigation groundwater quality, total dissolved solids (TDS), electrical conductivity (EC), evaluation index, ArcGIS Spatial Analyst, FAO guideline, yield potential.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7208
10.22146/jag.7208
Journal of Applied Geology; Vol 5, No 2 (2013)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7208/5647
Copyright (c) 2015 Chhuon Kong, Heru Hendrayana, Agung Setianto
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7209
2018-03-02T01:40:10Z
jag:ART
ESTIMATION OF THE GEOLOGICAL STRENGTH INDEX SYSTEM FOR CAVITY LIMESTONE LAYER IN QUARRY AREA, REMBANG, CENTRAL JAVA PROVINCE, INDONESIA
Wijaya, R. Andy Erwin
Karnawati, Dwikorita
Srijono, Srijono
Wilopo, Wahyu
Limestone mining needs a good mine design which is safe for the environment. Mine design is determined by the rock mass quality. The rock mass quality in each mine location is not necessary the same depending on the geological conditions. The research area is located in limestone quarry of Sale District, Rembang Regency, Center Java Province-Indonesia. In the limestone quarry area, there is cavity zone which consists of cavity limestone layer at the wall of quarry bench. This cavity layer in limestone quarry has occurred by solution process. The cavity layer zone is a potentially weak zone which has caused bench failures in the limestone quarry area. The objective of this research is to analyze the rock mass quality in the cavity limestone layer using Geological Strength Index (GSI) system. Final result of the research is a rock mass characterization, specifically for cavity limestone layer. Keywords: geological strength index, limestone, cavity layer
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7209
10.22146/jag.7209
Journal of Applied Geology; Vol 5, No 2 (2013)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7209/5648
Copyright (c) 2015 R. Andy Erwin Wijaya, Dwikorita Karnawati, Srijono Srijono, Wahyu Wilopo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7210
2018-03-02T01:38:21Z
jag:ART
DETERMINATION OF NUCLEAR POWER PLANT SITE IN WEST BANGKA BASED ON ROCK MASS RATING AND GEOLOGICAL STRENGTH INDEX
Irvani, Irvani
Wilopo, Wahyu
Karnawati, Dwikorita
Indonesian government through the National Atomic Energy Agency has planned to build a nuclear power plant. One of the proposed sites is in West Bangka Regency, Bangka Belitung Archipelago Province. The engineering geology of this area is, however, not fully understood and requires further investigations. Engineering geology investigations were carried out by assessing the rock mass quality and bearing capacity based on field observation and drilling data. The assessment was conducted using Rock Mass Rating (RMR) and Geological Strength Index (GSI) classification. The rock mass in the study area was divided into four units, namely Units of Sandstone, Granite, Mudstone and Pebbly Sandstone. The RMR and GSI values in the study area are influenced by the parameters of discontinuity space density, the slope of discontinuity orientation, grade of weathering and groundwater conditions. The assessment shows that the Granite Unit has the best quality which is shown by the average RMR value of 53 and GSI value of 66. Based on the average RMR value, the Granite Unit is estimated to have cohesion value between 0.2 and 0.3 MPa, friction angle between 25° and 35°, and allowable bearing pressure between 280 and 135 T/m2. Based on the GSI value, the Granite Unit is estimated to have uniaxial compressive strength value between 1.0465 and 183.8 MPa, tensile strength between (-0.0122) and (-5.2625) MPa, rock mass strength values between 24.5244 and 220.351 MPa, and modulus of deformation within a range of 1.73–86.68 GPa. The Granite Unit is considered to be the most appropriate location for the nuclear power plants. Keywords: Nuclear power plant foundation, geological strength index, rock mass rating, rock mass quality
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7210
10.22146/jag.7210
Journal of Applied Geology; Vol 5, No 2 (2013)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7210/5649
Copyright (c) 2015 Irvani Irvani, Wahyu Wilopo, Dwikorita Karnawati
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7211
2018-03-02T01:36:51Z
jag:ART
CHARACTERISTICS AND LIQUEFACTION OF COAL FROM WARUKIN FORMATION, TABALONG AREA, SOUTH KALIMANTAN–INDONESIA
Nursanto, Edy
Idrus, Arifudin
Amijaya, Hendra
Pramumijoyo, Subagyo
Since the coal characteristic is the main controlling factors in coal liquefaction, thus five coal seams with different coal rank from Warukin Formation in Tabalong Area, South Kalimantan have been used in this study. Three seams were low rank coal (Wara 110, Wara 120, Wara 200) while two seams were medium rank (Tutupan 210 and Paringin 712). The objectives of this study was to investigate the effect of coal rank on the rate of coal conversion factor. Coal liquefaction was conducted in an autoclave on low pressure (14.7 psi) and temperature 120°C. Experiments were designed with time intervals 30, 60 and 90 minutes, respectively. The average coal properties of seam Wara 110, Wara 120 and Wara 200 were 26.65%, 5.08%, 46.26% and 30.60% for inherent moisture, ash content, volatile matter and. fixed carbon, respectively. In contrast, coal properties for seam Tutupan 210 and Paringin 712 were 18.42%, 1.81%, 23.02% and 35.76% for inherent moisture, ash content, volatile matter and fixed carbon, respectively. The maximum yields for Wara 110, Wara 120 and Wara 200 were 48.60% (30 minutes), 51.27% (60 minutes) and 46.72% (90 minutes). In comparison, Tutupan 210 and Paringin 712 resulted maximum yields of 8.22% (30 minutes), 18.35% (60 minutes), 6.23% (90 minutes). In conclusion, low rank coal has higher yield conversion compared to medium rank coal since it has higher H/C ratio. Keywords: Coal liquefaction, low rank coal, Kalimantan.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7211
10.22146/jag.7211
Journal of Applied Geology; Vol 5, No 2 (2013)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7211/5650
Copyright (c) 2015 Edy Nursanto, Arifudin Idrus, Hendra Amijaya, Subagyo Pramumijoyo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7212
2018-03-02T01:32:31Z
jag:ART
CHEMICAL COMPOSITION AND HYDRAULIC CONNECTIVITY OF SPRINGS IN THE SOUTHERN SLOPE OF MERAPI VOLCANO
Boulom, Johnny
Eka Putra, Doni Prakasa
Wilopo, Wahyu
Springs are easily found in the southern slope of Merapi volcano, Sleman Regency, Yogyakarta Special Province, Indonesia. Springs origins on this location are commonly related to the existing of Merapi Aquifer System, but importance question of all these springs are hydraulic connectivity among them. In response to the issue, the objective of this research is to determine hydraulic connectivity of springs based on their chemical composition. To answer the objectives, measurement of spring discharge and physicochemical properties of spring’s water and sampling of selected spring’s water were conducted on this research in the study area. Water chemistry composition was classify by Kurlov formula and displayed by Fingerprint diagram and Composition diagram. Results show that the chemical compositions of most all spring samples are almost similar and does not significantly different for most properties from upstream to downstream, which are Na–Ca–HCO3 water, only one spring of Umbul Jatiningsih spring had different chemical composition of Ca–Na–Mg– HCO3 water. Based on the Fingerprint diagram and Composition diagram evaluation, the spring’s water can be differentiated into three groups. Group 1 consists of ten springs which have similar chemical composition of Na–Ca–HCO3 and with electrical conductivity ranges between 150 to 200 mS/cm. Group 2 consists only one spring “Umbul Pajangan” which contain similar chemical composition to Group 1 but has significantly higher ions concentration (EC value about 400 mS/cm) and Group 3 consists also only one spring “Umbul Jatiningsih” which has significantly different ionic composition with Group 1 and 2. Regarding on this condition, it can be concluded that Group 1 spring is hydraulically connected and relate to the shallow aquifer system of Merapi Aquifer System. In other side, water of spring “Umbul Pajangan”possibly comes from deeper aquifer system of Merapi Aquifer System and this argument is supported by the spring discharge evaluation. Finally, spring “Umbul Jatiningsih” is originate mainly from different aquifer system of porous limestone aquifer. Keywords: Merapi aquifer system, spring, chemical composition, geological condition
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7212
10.22146/jag.7212
Journal of Applied Geology; Vol 6, No 1 (2014)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7212/5651
Copyright (c) 2015 Johnny Boulom, Doni Prakasa Eka Putra, Wahyu Wilopo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7213
2018-03-02T01:30:50Z
jag:ART
WEATHERING STAGE CONTROL OF TUFF AND ITS INFLUENCE TO THE MALINO–MANIPI LANDSLIDE SUSCEPTIBILITY, SOUTH SULAWESI INDONESIA
Busthan, Busthan
Imran, A.M.
Samang, L.
Ramli, M.
In 2013 there has been 34 incidents of landslides which cut the roads linking between Gowa and Sinjai off. The purpose of this study was to determine the effect on the stage of weathering of landslide in the study area. Methods used in this study are field survey, petrographic analysis, XRD analysis and shear strength testing of rock. Field survey results indicates that the area is dominated by tuffs that are partly volcanic breccia and lava. Petrographic analysis, showing the dominant composition of tuff with volcanic glass, bitownite, pyroxene and opaque minerals, and XRD analysis results indicate weathering tuffs that have experienced high and completely weathered contain smectite and halloysite clay types, and insitu shear strength test results indicate a strong shift to the lower tuff with high stage of weathering. Keywords: Susceptability to landslides, the stage of weathering, halloysite and smectite, shear strength, roads of Malino–Manipi
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7213
10.22146/jag.7213
Journal of Applied Geology; Vol 6, No 1 (2014)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7213/5652
Copyright (c) 2015 Busthan Busthan, A.M. Imran, L. Samang, M. Ramli
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7214
2018-03-02T01:27:08Z
jag:ART
ROCK MASS RATING OF CAVITY LIMESTONE LAYER IN REMBANG, CENTRAL JAVA, INDONESIA
Wijaya, R. Andy Erwin
Karnawati, Dwikorita
Srijono, Srijono
Wilopo, Wahyu
mine design. Mine design is determined by the rock mass quality, which varies from one mine location to another, depending on the geological conditions. The research area is located in limestone quarry of Sale District, Rembang Regency, Central Java Province, Indonesia. In the study area, a cavity zone is exposed at the wall of quarry bench and occurs by a solution process. The cavity layer zone is a weak zone which has caused bench failures. The objective of this research is to evaluate the quality of the cavity limestone layer for a safe mine design using Rock Mass Rating (RMR) system. Final result of the research is a rock mass characterization, specifically for the cavity limestone layer. Keywords: Rock mass rating, limestone, cavity layer
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7214
10.22146/jag.7214
Journal of Applied Geology; Vol 6, No 1 (2014)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7214/5653
Copyright (c) 2015 R. Andy Erwin Wijaya, Dwikorita Karnawati, Srijono Srijono, Wahyu Wilopo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7215
2018-03-02T01:25:14Z
jag:ART
HIGH SULFIDATION EPITHERMAL MINERALIZATION AND ORE MINERAL ASSEMBLAGES OF CIJULANG PROSPECT, WEST JAVA, INDONESIA
Tun, Myo Min
Warmada, I Wayan
Idrus, Arifudin
Harijoko, Agung
Verdiansyah, Okki
Watanabe, Koichiro
Cijulang is a high-sulfidation epithermal system hosted in the calc-alkaline rocks of andesite lava and lapilli tuff. Mineralization in the prospect is characterized by pyrite-enargite-gold and associated acid sulfate alteration. Studies on ore and gangue mineral assemblages and their mutual textural relationships were carried out in order to explore the paragenetic sequence of mineralization. Hypogene mineralization primarily occurs in the silicic core and the advanced argillic zone in the form of massive replacement, fracture-filling veinlets, vug-filling, patches and dissemination. Mineralization is apparently controlled by both lithology and structures. Common ore minerals include pyrite, enargite, luzonite, tennantite, chalcopyrite, covellite, galena, emplectite and Te-bearing minerals. The paragenetic study indicates that the epithermal prospect evolved from an early stage of intense acid leaching resulting in the formation of vuggy silica and advantage argillic mineral assemblage which was followed by the sulfides deposition. Two metal stages were identified during ore deposition: an early Fe-As-S stage and the later Cu-Fe-As-S stage. The former stage is char- acterized high-sulfidation state sulfides such as enargite/ luzonite+covellite whereas a later stage of Cu- Fe-As–S is represented by intermediate sulfidation state sulfides assemblage of tennantite+chalcopyrite. Gold is probably introduced in the early stage within the ore system and more abundant in the late stage. Keywords: Cijulang, high-sulfidation, acid sulfate, mineralization, enargite, paragenetic, metal stages
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7215
10.22146/jag.7215
Journal of Applied Geology; Vol 6, No 1 (2014)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7215/5654
Copyright (c) 2015 Myo Min Tun, I Wayan Warmada, Arifudin Idrus, Agung Harijoko, Okki Verdiansyah, Koichiro Watanabe
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7216
2018-03-02T01:21:40Z
jag:ART
GEOCHEMICAL VARIATIONS ON HOSTED VOLCANIC ROCKS OF CIBALIUNG EPITHERMAL GOLD MINERALISATION, BANTEN – INDONESIA: IMPLICATIONS FOR DISTRIBUTION OF SUBDUCTION COMPONENTS
Titisari, Anastasia Dewi
Phillips, David
Hartono, Hartono
Subduction of the Indo-Australian Plate beneath the Eurasian Plate formed at least seven magmatic arcs in Indonesia. One of the magmatic arcs is the Neogene Sunda-Banda arc hosts various style of gold mineralisation such as Cibaliung epithermal gold mineralisation. Major and trace element data for host volcanic rocks to the Cibaliung epithermal gold mineralisation is provided by this study to identify the magmatic arc system and the distribution of subduction components. Enriched LILE (Large Ion Lithopile Element) and LREE (Light Rare Earth Element) compositions for basaltic andesite – rhyodacitic samples from the Cibaliung district are characteristic of calc-alkaline arcs. In this typical volcanic arc, the subduction component can be shown to make a dominant contribution to its content of LILE such as Rb, K, Th, and Ba enriched (more than 88%) relative to the mantle and within plate inputs. The incompatible elements (Hf, Zr, and Nb) cannot be observed in the subduction component and thus assumed to be derived from trace element enriched sub-continental lithosphere. These incompatible elements are defined as conservative elements therefore it suggests that the magma occurrence is related to a hydrous slab component. Keywords: Subduction, Indo-Australian plate, magmatic arcs, volcanic rocks, Cibaliung, epithermal gold.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7216
10.22146/jag.7216
Journal of Applied Geology; Vol 6, No 1 (2014)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7216/5655
Copyright (c) 2015 Anastasia Dewi Titisari, David Phillips, Hartono Hartono
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7217
2018-01-15T03:11:13Z
jag:ART
LANDSLIDE SUSCEPTIBILITY ASSESSMENT OF KOKAP AREA USING MULTIPLE LOGISTIC REGRESSION
Makealoun, Somyot
Eka Putra, Doni Prakasa
Wilopo, Wahyu
A number of landslides have occured in Kokap SubDistrict, Kulon Progo Regency, Yogyakarta Special Province, Indonesia, which have influenced the communities. The natural disaster is commonly associated with a few days of heavy rainfall events. To mitigate the impact of landslides in this area, a landslide susceptibility assessment needs to be carried out. The main objective of this research is to develop a landslide susceptibility zonation in the research area by applying a logistic regression (LR) method. Field observation was conducted at 68 locations in the research area, in which 46 landslides occured. Data of slope angle, lithology, geologic structure and groundwater conditions were collected. The relationship between landslide occurrence and the slope angle, lithology, geologic structure and groundwater conditions was analysed using the LR method. The analysis results showed a 0.984 standard error, implying a good-fit model. The study area was classified into very low, low, moderate, high and very high landslide susceptibility zones with 0–20%, 20–40%, 40–60%, 60–80%, and 80–100%, respectively, probabilities of occurrence. A 60% area of the total study area was classified as a moderate to very high susceptibility to landslide. From 47 landslides, 80% landslides occured in high and very high landslide susceptibility zones, 17% landslides occured in the moderate susceptibility zone and 2% landslides occured in the low susceptible zone. None of landslides occured in the very low landslide susceptibility zone. The analysis results show that LR method is a very useful method for landslide prediction. Keywords: landslide susceptibility, multiple logistic regression, Kokap Kulon Progo-Indonesia
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7217
10.22146/jag.7217
Journal of Applied Geology; Vol 6, No 2 (2014)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7217/5656
Copyright (c) 2015 Somyot Makealoun, Doni Prakasa Eka Putra, Wahyu Wilopo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7218
2018-01-15T03:14:09Z
jag:ART
FLUID INCLUSION STUDIES OF THE EPITHERMAL QUARTZ VEINS FROM SUALAN PROSPECT, WEST JAVA, INDONESIA
Tun, Myo Min
Warmada, I Wayan
Idrus, Arifudin
Harijoko, Agung
Verdiansyah, Okki
Watanabe, Koichiro
Sualan prospect is located at Talegong Sub-district of Garut Regency, West Java, Indonesia. The area constitutes calc-alkaline volcanic and volcaniclastic rocks of Tertiary age. The rocks have experienced regional propylitic and argillic alteration. Fluid inclusions from quartz veins were studied in order to constrain the nature, characteristics and evolution of fluids. Microthermometric measurements on fluid inclusion were carried out by freezing and heating experiment. Temperatures of homogenization (Th) and final melting of ice (Tm) were measured for primary, liquid-dominated, two-phase inclusions. The values of Th range from 160°C to 210°C and salinities range from 0.35 to 4.96 wt.% NaCl equiv. Formation temperature of the quartz veins are estimated at 180°C and 190°C and paleo-depth of formation are at 80m and 140m, respectively. Microthermometric data indicates that fluid mixing and dilution were important processes during the evolution of hydrothermal system. Based on fluid inclusion types, microthermometric data, trapping temperature, paleo-depth, texture of quartz and hydrothermal alteration types, quartz veins from prospect were developed under epithermal environment. Keywords: Quartz vein, fluid inclusions, microthermometry, salinities, formation temperature, paleo-depth, epithermal, Sualan prospect.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7218
10.22146/jag.7218
Journal of Applied Geology; Vol 6, No 2 (2014)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7218/5657
Copyright (c) 2015 Myo Min Tun, I Wayan Warmada, Arifudin Idrus, Agung Harijoko, Okki Verdiansyah, Koichiro Watanabe
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7219
2018-01-15T03:17:12Z
jag:ART
METAMORPHIC EVOLUTION OF GARNET–BIOTITE–MUSCOVITE SCHIST FROM BARRU COMPLEX IN SOUTH SULAWESI, INDONESIA
Setiawan, Nugroho Imam
Osanai, Yasuhito
Nakano, Nobuhiko
Adachi, Tatsuro
This paper explains the first report in metamorphic evolution of pelitic schist from Barru Complex in South Sulawesi, Indonesia. Garnet-biotitemuscovite schist was examined petrologically to assess the metamorphic evolution history, which has implications on tectonic condition of this region. The rock mainly composed of garnet, biotite, muscovite, epidote, quartz, rutile, hematite, and plagioclase. Inclusions in the garnet preserve records of prograde stage of this rock, which are epidote, titanite, quartz, and apatite. Garnet, biotite, muscovite, quartz, rutile, and plagioclase are concluded as equilibrium assemblages at peak P-T condition of this rock, which estimated at 501–562 ºC and 0.89–0.97 GPa. The result is still on the ranges of the estimated geothermal gradient P-T path of eclogite from Bantimala Complex. Similar geothermal gradients of metamorphisms might be indicated that these metamorphic rocks were metamorphosed on the similar tectonic environments. Keywords: Pelitic schist, Barru Complex, South Sulawesi, metamorphic evolution.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7219
10.22146/jag.7219
Journal of Applied Geology; Vol 6, No 2 (2014)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7219/5658
Copyright (c) 2015 Nugroho Imam Setiawan, Yasuhito Osanai, Nobuhiko Nakano, Tatsuro Adachi
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7220
2018-01-15T03:19:50Z
jag:ART
AN EVALUATION OF ROCK SLOPE STABILITY USING LIMIT EQUILIBRIUM ANALYSES
Aprilia, Faridha
Indrawan, I Gde Budi
The stability of rock slopes is controlled by several factors, such as the intact rock strength, discontinuity characteristics, groundwater condition, and slope geometry. Limit equilibrium (LE) analyses have been commonly used in geotechnical practice to evaluate the stability of rock slopes. A number of methods of LE analyses, ranging from simple to sophisticated methods, have been developed. This paper presents stability analyses of rock slopes at the Batu Hijau open mine in Sumbawa Barat using various methods of LE analyses. The LE analyses were conducted at three cross sections of the northern wall of the open mine using the Bishop Simplified, Janbu Simplified, Janbu Generalised, and General Limit Equilibrium (GLE) methods in Slide slope stability package. In addition, a Plane Failure (PF) analysis was performed manually. Shear strength data of the discontinuity planes used in the LE analyses were obtained from back analyses of previous rock slope failures. The LE analysis results showed that the rock slopes were likely to have shallow non-circular critical failure surfaces. The factor of safety (Fs) values obtained from the Bishop Simplified, Janbu Simplified, Janbu Generalised, and GLE methods were found to be similar, while the Fs values obtained from the PF method were higher than those obtained from the more rigorous methods. Keywords: Batu Hijau mine, Bishop Simplified, Janbu Simplified, Janbu Generalised, limit equilibrium analyses, general limit equilibrium, rock slope stability, plane failure.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7220
10.22146/jag.7220
Journal of Applied Geology; Vol 6, No 2 (2014)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7220/5659
Copyright (c) 2015 Faridha Aprilia, I Gde Budi Indrawan
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7221
2018-01-15T03:24:56Z
jag:ART
DYNAMIC MORPHOLOGICAL CHANGES OF SPIT IN APRIL–MAY 2014 IN OPAK RIVER MOUTH, BANTUL, DAERAH ISTIMEWA YOGYAKARTA
Freski, Yan Restu
Setianto, Agung
Srijono, Srijono
As an oceanic coast, the beaches in the southern part of Java Island are predominantly influenced by ocean energy which is driven by periodical monsoon. This periodical process impacts the dynamic changes of spit in the river mouth system. Therefore, spit is a key to study the process in the southern coast of Java Island especially in Opak River Mouth. It needs a deep-root explanation about the morphological changes and the sedimentological mechanism. This research project was built by data such as spit geometry, aerial photographs and spontaneous wind direction. The supporting data included multitemporal IKONOS-Quickbird images from Google Earth and aerial photographs. These data were collected from field-work investigation and laboratorywork. The spit geometry was compiled by Global Positioning System handheld tracking along the edge of spit and crosschecked by aerial photograph using pole. The ultimate interpretation and periodic models were built by data reconstruction based on the geometry of spit and spontaneous wind direction. Spit changed weekly due to monsoon transition in April to May 2014. The morphological changes could be noted as the spit starting to be cut off by the highrate flow of Opak River. The process continued until the net drift moving westward. Keywords: April, coast, May, Opak river mouth, spit.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7221
10.22146/jag.7221
Journal of Applied Geology; Vol 6, No 2 (2014)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7221/5660
Copyright (c) 2015 Yan Restu Freski, Agung Setianto, Srijono Srijono
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7222
2018-01-15T03:27:12Z
jag:ART
ESTIMATION OF SUBSURFACE STRUCTURE BASED ON MICROTREMOR, BORE HOLE OBSERVATIONS AND STOCHASTIC STRONG GROUND MOTION SIMULATIONS IN PALU CITY, CENTRAL SULAWESI, INDONESIA: A VALIDATION AND SENSITIVITY STUDY ON THE 23 JANUARY 2005 (PALU) EARTHQUAKE
Thein, Pyi Soe
Pramumijoyo, Subagyo
Wilopo, Wahyu
Setianto, Agung
Brotopuspito, Kirbani Sri
Kiyono, Junji
In this study, we investigated the subsurface structure and strong ground motion parameters for Palu City. One of the major structures in Central Sulawesi is the Palu-Koro Fault system. Several powerful earthquakes have struck along the Palu-Koro Fault during recent years, one of the largest of which was an M 6.3 event that occurred on January 23, 2005 and caused several casualties. Following the event, we conducted a microtremor survey to estimate the shaking intensity distribution during the earthquake. From this survey we produced a map of the peak ground acceleration, velocity and ground shear strain in Palu City. We performed single observations of microtremors at 151 sites in Palu City. The results enabled us to estimate the site-dependent shaking characteristics of earthquake ground motion. We also conducted 8-site microtremor array investigation to gain a representative determination of the soil condition of subsurface structures in Palu. From the dispersion curve of array observations, the central business district of Palu corresponds to relatively soil condition with Vs ≤ 300 m/s, the predominant periods due to horizontal vertical ratios (HVSRs) are in the range of 0.4 to 1.8 s and the resonant frequency are in the range of 0.7 to 3.3 Hz. Three boreholes were throughout the basin especially in Palu area to evaluate the geotechnical properties of subsurface soil layers. The depths are varying from 1 m to 30 m. Strong ground motions of the Palu area were predicted based on the empirical stochastic green’s function method. Peak ground acceleration and peak ground velocity becomes more than 0.04 g and 30 kine in some areas, which causes severe damage for buildings in high probability. Keywords: Palu-Koro fault, microtremor, bore holes, peak ground acceleration and velocity.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/7222
10.22146/jag.7222
Journal of Applied Geology; Vol 6, No 2 (2014)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/7222/5661
Copyright (c) 2015 Pyi Soe Thein, Subagyo Pramumijoyo, Wahyu Wilopo, Agung Setianto, Kirbani Sri Brotopuspito, Junji Kiyono
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/16917
2017-10-24T04:15:08Z
jag:ART
Characteristics Of Hydrothermal Alteration In Cijulang Area, West Java, Indonesia
Tun, Myo Min
Warmada, I Wayan
Harijoko, Agung
Al-Furqan, Reza
Watanabe, Koichiro
Characterization of hydrothermal alteration in theCijulang area (West Java, Indonesia) was carriedout using shortwave infrared spectroscopy. Hydrothermal alteration in the Cijulang area occurs in the calc-alkaline volcanic and volcaniclastic rocks. Shortwave infrared spectroscopic measurements of reflectance for altered rocks and minerals were carried out by ASD-FieldSpec and the laboratory spectra acquired were then analysed with “The Spectral Geologist” software program. Shortwave infrared spectroscopy is capable of detecting most finegrained alteration minerals from different hydrothermal alteration zones. Characteristic alteration minerals identified from the SWIR technique include pyrophyllite, alunite, kaolinite, dickite, illite, montmorillonite, polygorskite, gypsum, epidote, paragonite, and muscovite. Most of the spectra show mixture ofalteration minerals and only a few display pure spectra of single mineral. The crystallinity of kaolinite from the samples was also determined from the reflectance spectra and show moderately to high crystallinity. Alteration system of the Cijulang prospectis similar to others documented high-sulfidation epithermal deposits, such as Rodalquilar (Spain), Summitville (Colorado), and Lepanto (Philippines). A characteristic alteration sequence and zonation of advanced argillic, argillic and propylitic alterationoutward from the silica core has resulted from the progressive cooling and neutralization of hot acidic magmatic fluid with the host rocks.Keywords: Cijulang, High-sulfidation, Alteration minerals, Shortwave Infrared Spectroscopy
Geological Engineering Department Universitas Gadjah Mada
2015-09-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/16917
10.22146/jag.16917
Journal of Applied Geology; Vol 7, No 1 (2015)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/16917/11123
Copyright (c) 2015 Myo Min Tun, I Wayan Warmada, Agung Harijoko, Reza Al-Furqan, Koichiro Watanabe
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/16918
2018-01-15T03:02:10Z
jag:ART
Geochemical Fraction, Mobility And Bioavailability Of Lead In Unsaturated Soil Of Yogyakarta City, Indonesia
Zaw Aye, Saw Aung
Hendrayana, Heru
Eka Putra, Doni Prakasa
Sato, Tsutomo
Lead (Pb) is one of common heavy metals found inthe soil of urban environment. In Yogyakarta City,Indonesia, lead content in the soil was already reported by some researchers, however all of the report were only reveals the distribution of lead concentration in the soil. Therefore, this research paper aims to understand the geochemical fraction leadin the soil of Yogyakarta City and assess the mobility and bioavailability of lead release to the environment. The soil sampling location is selected on Kotagede District, representing the oldest urban area of Yogyakarta city. A shallow bore hole was drill until about 7 m below the surface and soil/sediments weresampled for each 1 m depth started from the surface. Six steps of sequential extraction procedures were carried out to assess the geochemical fraction of Pb for each of soil samples. The sequential extraction shows that the highest amount of Pb in thesoil of Yogyakarta City is found in amorphous ironoxide, crystalline iron oxide and non residual fraction form of Pb. Based on the results of geochemical fraction, the mobility factor of lead can be calculated and reveals low mobility factor range from 0.4 to 3.3%. The mobility of lead is decreased from the surface to the deeper soil, on the other hand the bioavailability of Pb calculated from exchangeable and carbonate fraction is also show low risk of bioavailability. Therefore, it can be concluded that although Pb concentration is high in non-residual fraction, Pb isin low risk condition due to its poor mobility and bioavailability. But, concern on lead contamination should be considered because if the concentration of Pb is enriched over the adsorption capacity of ironoxide, it can easily release to the environment and can impact to human in the future.Keywords: Yogyakarta city, Lead, Sequential extraction, Geochemical fraction
Geological Engineering Department Universitas Gadjah Mada
2015-06-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/16918
10.22146/jag.16918
Journal of Applied Geology; Vol 7, No 1 (2015)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/16918/11124
Copyright (c) 2015 Saw Aung Zaw Aye, Heru Hendrayana, Doni Prakasa Eka Putra, Tsutomo Sato
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/16919
2020-02-20T03:32:46Z
jag:ART
Site Investigation For Construction Of Emergency Spillway At The Jatigede Dam
Indrawan, I Gde Budi
Warman, Gusti Imam
An emergency spillway has been planned to be constructed at the Jatigede Dam, West Java, to allow floodwater to flow downstream and to prevent the capacity of the main spillway to be exceeded during large flood events. The complex geology of theJatigede Dam area, however, poses a challenge to determine the suitable location for the emergency spillway construction, either in the area to the west or to the east of the embankment dam. An engineering geological mapping and landslide susceptibilityzoning were conducted to determine the engineeringgeological characteristics of the area surrounding theJatigede Dam. The site investigation showed that thearea to the west of the embankment dam tended tohave a lower slope inclination than the area to theeast of the embankment dam. Both areas to the westand to the east of the embankment dam were found tobe composed of less erosion resistant rock units. Theexistence of the earth retaining structures for slopestabilization in the area to the east of the embankment dam will, however, likely limit the flexibility in developing the emergency spillway route. With respect to the existence of fault systems, both areas to the west and to the east of the embankment dam will likely be influenced by similar conditions. The areato the west of the embankment dam tended to be lesssusceptible to landslide as compared to the area tothe east of the embankment dam. The undevelopedland use of the area to the west of the embankmen dam as compared to the area to the east of the embankment dam will provide more flexibility in construction of the emergency spillway. Due to the morefavorable engineering geological conditions, the area to the west of the embankment dam is proposed forthe location of the emergency spillway construction.Keywords: Emergency spillway, Engineering geological mapping, Jatigede Dam
Geological Engineering Department Universitas Gadjah Mada
2015-06-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/16919
10.22146/jag.16919
Journal of Applied Geology; Vol 7, No 1 (2015)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/16919/11125
Copyright (c) 2015 I Gde Budi Indrawan, Gusti Imam Warman
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/26947
2018-01-15T00:50:17Z
jag:ART
DEPOSITIONAL MODEL OF NGRAYONG FORMATION IN MADURA AREA, NORTH EAST JAVA BASIN, INDONESIA
Htwe, Paike
Surjono, Sugeng Sapto
Amijaya, Donatus Hendra
Sasaki, Kyuro
Lithofacies, Depositional environment, Sandstone, Ngrayong Formation, Madura Island, North East Java Basin
The early Middle Miocene Ngrayong Formation, an important reservoir of North East Java Basin, is well exposed in the central anticlinal part of Madura Island. The purpose of current study is to classify the depositional environments of the study area based on the characteristics and geometry of sedimentary facies. In the Madura island, the thicker clastics and deeper carbonates of Ngimbang Formation and Kujung Formation of Late Oligocene-Early Miocene deposited in the northeast-southwest asymmetrical half grabens. After the deposition of Kujung Formation, the basin morphology developed nearly eastwest trending shelf edge and the deposition of Tuban Formation began. The fine grained complex of Tuban Formation was followed by the Ngrayong Sandstones deposition. The depositional model of Ngrayong Formation is being producing of wide variety of depositional environments. Large scale cross-bedded sandstones and bioturbated massive sandstones with thin to medium bedded argillaceous limestone that outcrop in the northern part of the study area are deposited in costal environment. The heterolithic sandstone with planar and trough cross-lamination, fine grained sandstone with interlaminated structure and bioclastic carbonate exposed in the central part of the study area are deposited in upper shallow marine area. Dark grey siltstones and mudstones deposited in lower shallow marine area are well exposed in southern part of the study area. In conclusion, Ngrayong Formation in Madura area is developed in three depositional units which are coastal, upper shallow marine and lower shallow marine.
Geological Engineering Department Universitas Gadjah Mada
2015-07-26
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/26947
10.22146/jag.26947
Journal of Applied Geology; Vol 7, No 2 (2015); p. 51-60
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/26947/16594
Copyright (c) 2015 Paike Htwe, Sugeng Sapto Surjono, Donatus Hendra Amijaya, Kyuro Sasaki
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/26961
2017-11-30T03:58:40Z
jag:ART
Geochemistry, Hydrothermal alteration and Ore mineralogy of Skarn Mineralization at Wethey-Pheshey area, Thabeikkyin Township, Mandalay Region, Myanmar
Naing Oo, Toe
Setijadji, Lucas Donny
Warmada, I Wayan
Oo, Than Than
Wethey-Pheshey area · Skarn · Mineralization · Hydrotermal alteration · Geochemistry · Myanmar.
Wethey-Pheshy area is located 80 km north of Mandalay at Thabeikkyin Township, Mandalay Region. X-ray Diffraction (XRD) Analysis and Inductively Coupled Plasma Mass Spectrometry (ICP-MS) were applied in this study. Geochemical studies on the host rocks indicate that major and minor oxides compositions of metamorphicrocks show some degree of variation. CaO, MgO, FeO, TiO2 and P2O5 concentration of the metamorphic rock samples show a coherent negative correlation with SiO2 whereas Na2O is positively correlated with SiO2. The metamorphic rocks are strongly enriched in light rare earth elements (LREE) and relatively depleted in heavy rare earth element (HREE). The depleted Eu-nomalies in the chondrite-normalized REE diagrams indicate a plagioclase-depleted Eu crustal source or fractionation during magmatic differentiation. Intrusion of granitic rocks in the diopside marble caused the base metal ore mineralization and associated skarn alterations. Granite shows the sub-alkaline nature and peraluminous character. It is identified as I-type granite (magnetite series) developed in the volcanic arc setting. Hydrothermal alteration types associated with gold and skarn mineralization in the study area include calc-silicate alteration, propylitization, sericitization (argillitization) and hematization. Based on the nature and characteristics of host rocks, mineralization and alteration style and geochemical characteristics in the study area is identified as intrusion-related skarn mineralization. Common ore minerals include chalcopyrite, galena, sphalerite, pyrite, gold and Fe-oxides.
Geological Engineering Department Universitas Gadjah Mada
2016-07-26
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/26961
10.22146/jag.26961
Journal of Applied Geology; Vol 1, No 2 (2016); p. 53-62
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/26961/16602
Copyright (c) 2016 Toe Naing Oo, Lucas Donny Setijadji, I Wayan Warmada, Than Than Oo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/26962
2017-11-30T03:58:40Z
jag:ART
Occurrences and Characteristics of Gold Mineralization in Rampi Block Prospect, North Luwu Regency, South Sulawesi Province, Indonesia
Idrus, Arifudin
Mansur, Suaib
Ahmad, Ahmad
Rahmayuddin, Rahmayuddin
Abdul, Abdul
Gold · Orogenic/mesothermal · Rampi block prospect · North Luwu · Sulawesi · Indonesia.
This study is aimed to identify the occurences, characterisatics and genetic type of gold mineralization, and to elucidate the preliminary gold potential in the study area. Research method includes field observation of prospect geology, hydrothermal alteration and ore mineralization. Laboratory analysis consists of petrography, ore microscopy and ore chemistry. Geologically, quartz ± gold veins were found in Rampi block prospect, which are mainly hosted by metamorphic and metasediment rocks. The quartz veins has structurally segmented with massive, brecciated and laminated textures. Orientation and distribution of veins is controlled by NW–SE and NE–SW trending structures. Sulfides are present with minor abundance (<1 %). Pyrite is obviously observed and partially oxidized. Arsenopyrite and stibnite are minor, while basemetal (Pb, Zn) sulfides are very rare. Gold mineralization occurred in quartz veins and closely related to silica-clay and silicic alteration. Gold grade varies from 0.1 to 11 ppm Au (29 samples). Quartz veins contained high gold grade (>9 ppm) commonly show laminated and brecciated texture and has been undergone a supergene enrichment. According to several characteristics above, gold deposit in Rampi block prospect tends to meet the criteria of orogenic/mesothermal gold type (cf. Groves et al., 2003). The deposit shares similarities with Awak Mas prospect, which is already confirmed to be a mesothermal type in Luwu district (cf. Querubin and Walters, 2011). Therefore, discoveries of economic mesothermal gold deposits are still open in the metamorphic terrains, and thus, it requires a systematic exploration based on the genetic model of the deposit.
Geological Engineering Department Universitas Gadjah Mada
2016-07-26
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/26962
10.22146/jag.26962
Journal of Applied Geology; Vol 1, No 2 (2016); p. 63-70
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/26962/16603
Copyright (c) 2016 Arifudin Idrus, Suaib Mansur, Ahmad Ahmad, Rahmayuddin Rahmayuddin, Abdul Abdul
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/26963
2017-11-30T03:58:40Z
jag:ART
The Effectiveness of Wenner-Schlumberger and Dipole-dipole Array of 2D Geoelectrical Survey to Detect The Occurring of Groundwater in the Gunung Kidul Karst Aquifer System, Yogyakarta, Indonesia
Eka Putra, Doni Prakasa
Hermawan, Oktanius Richard
2D geoelectrical survey · Wenner-Schlumberger method · Dipole-dipole method · Karst aquifer · Gunung Kidul · Indonesia.
Until today, geoelectrical survey is the most effective method for groundwater exploration. 2D method or known as horizontal profiling is now the most appropriate method in the geoelectrical survey compare to vertical electrical sounding method. The 2D method of Wenner-Schlumberger and Dipole-dipole configuration proved to be very effective to locate conventional aquifer occurrence on volcanic terrain or sedimentary terrain. Karst aquifer system is an unconventional aquifer and acts very differ in contrast with the conventional sedimentary aquifer. Heterogeneity and discontinuity of limestones in karst terrain will reveal a wide variety of resistivities, hence it is difficult to interpret. This research has important objective to define the effectiveness of the Wenner-Schlumberger and Dipole-dipole configuration in the 2D geoelectrical survey to explore groundwater in the karst area. Field observation of geology and 2D geoelectrical survey were conducted in underground river of Kali Suci Area, Gunung Kidul. In Kali Suci where an endokarst cave was occured on the surface, line survey was placed in the top of the cave and across the geometry of the cave. Measured stratigraphy in the wall of the cave found four types of limestone which consist of packstone, wackestone, grainstone and crystalline limestone. The Wenner-Schlumberger and Dipole-dipole method can detect differentiation of limestone types and also the exposed underground river successfully. However, compared to Wenner-Schlumberger array, Dipole-dipole array reveals less vertical accuration.. Therefore, on this research, the best method to detect water saturated zone or gourndwater in the karst system is the Wenner-Schlumberger method.
Geological Engineering Department Universitas Gadjah Mada
2016-07-26
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/26963
10.22146/jag.26963
Journal of Applied Geology; Vol 1, No 2 (2016); p. 71-81
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/26963/16604
Copyright (c) 2016 Doni Prakasa Eka Putra, Oktanius Richard Hermawan
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/26964
2017-11-30T03:58:40Z
jag:ART
Lithofacies and Sedimentation of Organic Matter in Fine Grained Rocks of Nanggulan Formation in Kulon Progo, Yogyakarta
Amijaya, Donatus Hendra
Adibah, Najibatul
Ansory, Ahmad Z.A.
Fine-grained rock · Lithofacies · Organic matter · Nanggulan Formation · Kulon Progo
Fine grained rocks especially shale play a significant role in shale hydrocarbon system. Research on Eocene Nanggulan shale becomes an interest lately since this shale is considered as prospective interval for shale gas source. It potentially contains significant organic matter because coaly sediment is found in this formation as well. Nanggulan Formation fine grained rocks was deposited in various depositional environment from estuary – shallow marine. This paper integrates the result of lithofacies and depositional environment analysis with organic geochemical data to understand the sedimentation process of organic matter. Samples were taken from cores. The result of 14 geochemically analysed samples shows Total Organic Carbon (TOC) content between 0.36–1.00 % for fin e grained rocks (shales) and 12.80 % for coaly shales. Nine samples are categorized as fair and 2 samples are categorized as good source rock. The depositional environment of Nanggulan Formation sediment, which was shallow marine at Late Eocene and estuary (salt marsh) at Early Eocene, produced sediment with higher TOC. Whereas the deposition of sediment in estuary (tidal flat) at Middle Eocene produced lower content of TOC. Vulcanic activity at Middle Eocene also caused less organic material preservation because it produced abundant inorganic material.
Geological Engineering Department Universitas Gadjah Mada
2016-07-26
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/26964
10.22146/jag.26964
Journal of Applied Geology; Vol 1, No 2 (2016); p. 82-88
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/26964/16605
Copyright (c) 2016 Donatus Hendra Amijaya, Najibatul Adibah, Ahmad Z.A. Ansory
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/26978
2018-01-15T03:05:00Z
jag:ART
MINERALOGY, GEOCHEMISTRY, AND SEQUENTIAL EXTRACTION EXPERIMENT OF REE IN WEATHERED ANGGI GRANITE, MANOKWARI REGENCY, WEST PAPUA, INDONESIA
Prasastia, Ega Gita
Setijadji, Lucas Donny
Warmada, I Wayan
Anggi Granite, REE, Weathering, Sequential extraction experiment, Geochemical fraction
This research objective is to identify geochemical andmineralogical characteristics of Rare earth elements(REE) in the weathering products of Anggi Granite, which is located in Manokwari Regency, WestPapua, Indonesia. The research is conducted on 7samples of fresh rocks and 7 samples of weatheredrocks of Anggi Granite. The research analysis consists of petrography, XRD, XRF, and sequential extraction experiment, supported by secondary dataand references. Anggi Granite is S-type and peraluminous granite that contains zircon, monazite andapatite as a rare earth bearing minerals. Weathering products of Anggi Granite do not have a significant enrichment of REE, even some of the samplesare depleted in REE. REE in weathered Anggi Granite are dominantly present in the primary minerals,mostly in zircon and monazite. Extractable formof geochemical fractions include crystalline Fe-oxideoccluded fraction (ilmenite, hematite and goethite),and ion-exchangeable (illite, kaolin and chlorite).Enrichment of REE in the weathered Anggi Granite is influenced by the presence of resistant REEbearing minerals, in the forms of zircon and monazite, degree of weathering related to the presenceof secondary minerals, and other factors such as pHand Eh
Geological Engineering Department Universitas Gadjah Mada
2015-07-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/26978
10.22146/jag.26978
Journal of Applied Geology; Vol 7, No 1 (2015)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/26978/16616
Copyright (c) 2015 Ega Gita Prasastia, Lucas Donny Setijadji, I Wayan Warmada
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/26979
2018-01-15T03:04:06Z
jag:ART
DETERMINATION OF NUCLEAR POWER PLANT SITE IN WEST BANGKA BASED ON ROCK MASS RATING AND GEOLOGICAL STRENGTH INDEX
Irvani, Irvani
Wilopo, Wahyu
Karnawati, Dwikorita
nuclear power plant foundation, Geological Strength Index, Rock Mass Rating, rock mass quality
Indonesian government through the NationalAtomic Energy Agency has planned to build anuclear power plant. One of the proposed sitesis in West Bangka Regency, Bangka BelitungArchipelago Province. The engineering geologyof this area is, however, not fully understood andrequires further investigations. Engineering geology investigations were carried out by assessing therock mass quality and bearing capacity based onfield observation and drilling data. The assessmentwas conducted using Rock Mass Rating (RMR)and Geological Strength Index (GSI) classifications.The rock masses in the study area were dividedinto four units, namely units of sandstone, granite,mudstone and pebbly sandstone. The RMR andGSI values in the study area were influenced by theparameters of discontinuity space density, the slopeof discontinuity orientation, grade of weatheringand groundwater conditions. The assessment showsthat the granite unit had the best quality which wasshown by a 53 average RMR value and 66 GSIvalue. Based on the average RMR value, the graniteunit was estimated to have cohesion value between0.2 and 0.3 MPa, friction angle between 25° and35°, and allowable bearing pressure between 280and 135 T/m2. Based on the GSI value, the graniteunit was estimated to have uniaxial compressivestrength value between 1.0465 and 183.8 MPa, ten-sile strength between (-0.0122) and (-5.2625) MPa,rock mass strength values between 24.5244 and220.351 MPa, and modulus of deformation withina range of 1.73 - 86.68 GPa. The Granite Unit wasconsidered to be the most appropriate location forthe nuclear power plants.
Geological Engineering Department Universitas Gadjah Mada
2015-07-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/26979
10.22146/jag.26979
Journal of Applied Geology; Vol 7, No 1 (2015)
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/26979/16617
Copyright (c) 2015 Irvani Irvani, Wahyu Wilopo, Dwikorita Karnawati
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/26980
2018-01-15T02:33:01Z
jag:ART
MINERAL POTENTIAL MAPPING USING GEOGRAPHIC INFORMATION SYSTEMS (GIS) FOR GOLD MINERALIZATION IN WEST JAVA, INDONESIA
Sirisokha, Seang
Setijadji, Lucas Donny
Warmada, I Wayan
GIS, Weight of evidence method, Mineral potential mapping, Bayah Dome, Bogor, West Java
Western Java is a part of the Sunda Banda magmatic belt. This belt is well known to be host for several gold deposits in Indonesia, the distribution of 107 Au occurrences in this area was examined in terms of spatial association with various geological phenomena. The goal of this project is to use GIS to conduct weights of evidence (WofE) model for gold mineralization in West Java, Indonesia. A Geographic Information System (GIS) is a computer system for capturing, storing, querying, analyzing, and displaying geospatial data and weight of evidence method is one of the most important datadriven methods for mapping in GIS. The method is a probability based on technique for mapping mineral potential using the spatial distribution of known mineral occurrences. Therefore this method is very useful for gold potential mapping. There are six evidences maps such as NE–SW lineaments NW–SE Lineament, host rocks, heat sources, clay alteration and limonitic alteration, have been combined using a weights of evidence model to predict gold potential in West Java. The best predictive map generated by this method defines 21.62% (9902 km) of study area as favourable zones for gold mineralization further exploration work. It predicts correctly 74 (92.5%) of the 80 model deposits and predicts correctly 26 (96.35%) of the 27 validation deposits, has 6 main 2 prospective target for future exploration are located in Bayah Dome, southern mountain, Honjie Igneous Complex and Bogor zone, Purwakarta. Bayah Dome is highest potential area for gold deposit like Gunung Pongor, Cikidang, Cirotan, Ciawitali, Cikotok destricts and other deposits. The potential area of Au occurrences in research area is associated with NE–SW and NW–SE structure/ lineaments, dominated surrounding the Tertiary intrusive rock unit and hosted in Miocene to Pleistocene lithology rock unit.
Geological Engineering Department Universitas Gadjah Mada
2015-07-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/26980
10.22146/jag.26980
Journal of Applied Geology; Vol 7, No 2 (2015); p. 61-74
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/26980/16618
Copyright (c) 2015 Seang Sirisokha, Lucas Donny Setijadji, I Wayan Warmada
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/26981
2018-01-15T02:47:41Z
jag:ART
GEOLOGY AND ORE MINERALISATION OF NEOGENE SEDIMENTARY ROCK HOSTED LS EPITHERMAL GOLD DEPOSIT AT PANINGKABAN, BANYUMAS REGENCY, CENTRAL JAVA, INDONESIA
Idrus, Arifudin
Hakim, Fahmi
Warmada, I Wayan
Aziz, Mochammad
Kolb, Jochen
Meyer, Franz Michael
Geology, Ore mineralization, Hydrothermal alteration, LS epithermal, Paningkaban area, Indonesia.
Low suphidation (LS) epithermal gold deposits were recently found in the Paningkaban area, Central Java province, Indonesia, with more than five hundred artisanal gold miners currently operating in the area. This study is aimed to understand the geological factors controlling the gold mineralization and to characterize the alteration and ore mineralogy of the deposit. Several epithermal veins/veinlets trending N–S, NW–SE, and NE–SW are hosted by Tertiary turbiditic volcanoclastic sedimentary rocks of the Halang formation. This formation is composed of looping gradation of sandstone and siltstone units. Pre- and syn-mineralization structures such as extension joints, normal sinitral fault and sinitral fault control the gold mineralization. Fault movements formed dilational jogs manifested by NW-SE-trending en-echelon tension gash veins. Four main alteration zones are identified: (a) phyllic, (b) argillic, (c) sub propylitic and (d) weak subpropylitic. Ore minerals consist of native gold, electrum, native silver, pyrite, chalcopyrite, sphalerite, galena, arsenopyrite, cubanite, marcasite, covellite and tennantite, which are commonly associated withargillic alteration. Vein structures such as massive, swarm and low angle veins, stockwork and veins dispersed in diatreme breccia are present. Normal banded, cockade, crustiform, bladed carbonates as well as, comb and saccharoidal features are the typical vein textures. It is noteworthy that the veins are basically composed of carbonate with minor quartz at gold grades of up to 83 g/t Au. Based on the vein structures and textures, four stages of ore mineralization were developed consisting of (a) early stage (fluidized breccia and quartz vein), (b) middle stage (carbonate base metal), (c) late stage (late carbonate), and supergene stage. Gold mineralization originated mainly during middle and late stages, particularly in association with cockade, crustiform, bladed carbonate base metal veins. Based on those various features, the LS epithermal deposit in the study area is categorized as carbonate-base metalgold mineralization type.
Geological Engineering Department Universitas Gadjah Mada
2015-07-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/26981
10.22146/jag.26981
Journal of Applied Geology; Vol 7, No 2 (2015); p. 75-81
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/26981/16619
Copyright (c) 2015 Arifudin Idrus, Fahmi Hakim, I Wayan Warmada, Mochammad Aziz, Jochen Kolb, Franz Michael Meyer
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/26982
2018-01-15T02:51:33Z
jag:ART
VEINS AND HYDROTHERMAL BRECCIAS OF THE RANDU KUNING PORPHYRY Cu-Au AND EPITHERMAL Au DEPOSITS AT SELOGIRI AREA, CENTRAL JAVA INDONESIA
Sutarto, Sutarto
Idrus, Arifudin
Harijoko, Agung
Setijadji, Lucas Donny
Meyer, Franz Michael
Veins, Hydrothermal breccia, Porphyry, Epithermal
The Randu Kuning prospect is situated at Selogiri area, Wonogiri, Central Java, Indonesia. This location is about 40 km to the south-east from Solo city or approximately 70 km east of Yogyakarta city. Many Tertiary dioritic rocks related alterationmineralisation were found at the Randu Kuning area and its vicinity, including hornblende microdiorite, hornblende-pyroxene diorite and quartz diorite. Mineralisation type of the Randu Kuning prospect was interpreted as porphyry Cu-Au and a number epithermal Au-base metals deposits in its surrounding. The closed existing of porphyry Cu-Au and epithermal Au-base metals type deposits at the Randu Kuning area produced a very complex of veins and hydrothermal breccias crosscutting relationship. A lot of porphyry veins types were found and observed at the Randu Kuning area, and classified into at least seven types. Most of the porphyry veins were cross cut by epithermal type veins. Many epithermal veins also are found and crosscut into deeply porphyry vein types. There are genetically at least two type of hydrothermal breccias have recognized in the research area, i.e. magmatic-hydrothermal breccia and phreatomagmatic breccia. Magmatic hydrothermal breccias are mostly occured in contact between hornblende microdiorite or quartz diorite and hornblende-pyroxene diorite, characterized by angular fragments/clasts supported or infilled by silicas, carbonates and sulphides matrix derived from hydrothermal fluids precipitation. Phreatomagmatic breccias are characterized by abundant of the juvenile clasts, indicated contact between hot magma with fluid or water as well as many wall rock fragments such as altered diorites and volcaniclastic rock clasts set in clastical matrix. The juvenile clasts usually compossed by volcanic glasses and aphanitic rocks in rounded-irregular shape. Both veining and brecciation processes have an important role in gold and copper mineralisation of the Randu Kuning Porphyry Cu-Au and epithermal Au-base metals deposits, mostly related to the presence of quartz veins/veinlets containing significant sulphides, i.e., quartz with thin centre line sulphides (Abtype) veins, pyrite±chalcopyrite (C type) veinlets, pyrite+quartz± chalcopyrire±carbonate (D type) veins of porphyry types as well as epithermal environment quarts+ sulphides+carbonate veins.
Geological Engineering Department Universitas Gadjah Mada
2015-07-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/26982
10.22146/jag.26982
Journal of Applied Geology; Vol 7, No 2 (2015); p. 82-101
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/26982/16620
Copyright (c) 2015 Sutarto Sutarto, Arifudin Idrus, Agung Harijoko, Lucas Donny Setijadji, Franz Michael Meyer
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/26983
2018-01-15T02:52:53Z
jag:ART
NUMERICAL MODELLING AND SIMULATION OF CO2 –ENHANCED COAL-BED METHANE RECOVERY (CO2-ECBMR): THE EFFECT OF COAL SWELLING ON GAS PRODUCTION PERFORMANCE
Anggara, Ferian
Sasaki, Kyuro
Sugai, Yuichi
Coal swelling in CO2, Permeability, Low rank coal, CO2-ECBMR
This presents study investigate the effect of swelling on gas production performances at coal reservoirs during CO2-ECBMR processes. The stressdependent permeability-models to express effect of coal matrix shrinkage/swelling using Palmer and Mansoori (P&M) and Shi and Durucan (S&D) models were constructed based on present experimental results for typical coal reservoirs with the distance of 400 to 800 m between injection and production wells. By applying the P&M and S&D models, the numerical simulation results showed that CH4 production rate was decreasing and peak production time was delayed due to effect of stress and permeability changes caused by coal matrix swelling. The total CH4 production ratio of swelling effect/no-swelling was simulated as 0.18 to 0.95 for permeability 1 to 100 mD, respectively. It has been cleared that swelling affects gas production at permeability 1 to 15 mD, however, it can be negligible at permeability over 15 mD.
Geological Engineering Department Universitas Gadjah Mada
2015-07-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/26983
10.22146/jag.26983
Journal of Applied Geology; Vol 7, No 2 (2015); p. 102-111
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/26983/16621
Copyright (c) 2015 Ferian Anggara, Kyuro Sasaki, Yuichi Sugai
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/27584
2017-11-30T03:58:40Z
jag:ART
Groundwater Level Changes in Shallow Aquifer of Yogyakarta City, Indonesia: Distribution and Causes
Eka Putra, Doni Prakasa
Atmaja, Rilo Restu Surya
Manny, Liliane
Groundwater level changes _ Urban recharge _ Sewers leakage _ Yogyakarta City _ Indonesia
The population in Yogyakarta City, Indonesia has increased since 1970, resulting in high groundwater utilization. This normally results in a decline of groundwater level in shallow aquifer beneath the city. However, expansion of the city and urbanization effects can also have the opposite effect and lead to a rise of groundwater levels due to urban recharge. This study investigates groundwater level changes in Yogyakarta City during a time period of 30 years between 1985 and 2015. Collected data in this research are groundwater level, rainfall, population density, sewer system, and land use. Overlaying various spatial information reveals a pattern of groundwater level rise in some areas of the city by 0–12 m, whilst in other areas a decline of 0–9 m is discovered. Rising groundwater levels are mainly found in areas moderate to high population density where sewer system networks have been installed. The rising of groundwater levels is this expected to be caused by urban recharge and sewers leakage.
Geological Engineering Department Universitas Gadjah Mada
2017-08-18
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/27584
10.22146/jag.27584
Journal of Applied Geology; Vol 1, No 2 (2016); p. 89-99
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/27584/16885
Copyright (c) 2017 Doni Prakasa Eka Putra, Rilo Restu Surya Atmaja, Liliane Manny
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/30253
2018-11-14T03:04:51Z
jag:ART
Variation of Slab Component in Ancient and Modern Merapi Products: A Detailed Look into Slab Derived Fluid Fluctuation over the Living Span of One of the Most Active Volcanoes in Sunda Arc
Handini, Esti
Hasenaka, Toshiaki
Harijoko, Agung
Mori, Yasushi
Boron Slab component Slab derived fluid contribution Ancient and Modern Merapi Sunda arc
Holocene eruptions of Merapi have produced both medium-K and high-K calc alkaline series which correspond to products older and younger than 1900 years respectively. The change has been attributed to increasing sediment input as the volcano matures. This study presents two Merapi samples which represent Ancient and Modern Merapi. The two samples are analyzed for subduction components including B, Ba, Sr, and Pb using X-ray fluorescence (XRF) spectrometer and prompt gamma ray analysis (PGA). Our finding shows that Ancient Merapi sample from Plawangan Hill lava is close in affinities with younger than 1900 years high-K magma series. On the other hand, Modern Merapi sample from 2006 eruption juvenile is plotted within medium-K magma series which are observed in eruption products older than 1900 years. Ratios of fluid mobile elements to high field strength element (HFSE) (i.e. B/Nb, Ba/Y, Pb/Nb) consistently show that Ancient Merapi sample has higher input of slab derived fluid than Modern Merapi sample. A model using B/Nb and Ba/Nb suggests that Plawangan magma requires 1.5 % of sediment derived fluid, higher than estimated in 2006 eruption magma (1.2 %) and medium-K series magma, and within the range of high-K series magma, to explain its slab component enrichment. This evidence suggests that slab derived component addition to the sub-arc mantle wedge highly fluctuates over short period of evolution of a volcano. One possible explanation is the presence of veined hydrous metasomatized sub-arc mantle as Merapi magma source which allows melting of different mantle area to produce fluctuation of slab components in the course of evolution of Merapi magmas.
Geological Engineering Department Universitas Gadjah Mada
2017-11-13
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/30253
10.22146/jag.30253
Journal of Applied Geology; Vol 2, No 1 (2017); 1-14
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/30253/18263
Copyright (c) 2017 Esti Handini, Toshiaki Hasenaka, Agung Harijoko, Yasushi Mori
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/30254
2018-11-14T03:04:51Z
jag:ART
Engineering Geology of Sidosari Area, Magelang, Central Java, Indonesia
Indrawan, I Gde Budi
Ratri, Diyaning
Engineering geological mapping Landslide susceptibility Soil creeping Indonesia
Development of settlement area in Sidosari area and the surroundings requires complete understanding of the engineering geological conditions, including susceptibility to landslides, to prevent damaged properties and loss of lives. Surface engineering geological mapping at a 1:25000 scale was conducted to develop a detailed landslide susceptibility map for spatial planning and to identify most controlling factor of landslides in the research area based on conditions of geomorphology, rock and soil, geological structure, groundwater seepage, and land use. The engineering geological mapping showed that landslides commonly occurred in the moderate slopes of the denudational hill landform having slope inclination ranging from 9 to 17°, in the areas covered by residual soils of the vitric tuff 2 unit, in the areas of no groundwater seepage, and in the settlement areas, including in Kranjang Lor area where soil creeping occurred. The high susceptibility zone covered 55.5 % of the research area and was characterized by having slope inclinations ranging from 9 to 35°, engineering geological units of vitric tuff 2 and tuff breccia, and land uses of rice and dry fields and settlement. The low cohesion and very high swelling potential of the residual soils of the vitric tuff 2 unit were considered to be the main controlling factor of landslides in the research area.
Geological Engineering Department Universitas Gadjah Mada
2017-11-13
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info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/30254
10.22146/jag.30254
Journal of Applied Geology; Vol 2, No 1 (2017); 15-24
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/30254/18264
Copyright (c) 2017 I Gde Budi Indrawan, Diyaning Ratri
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oai:jurnal.ugm.ac.id:article/30255
2018-11-14T03:04:51Z
jag:ART
Lithostratigraphy of Tabul Formation and Onshore Geology of Nunukan Island, North Kalimantan
Husein, Salahuddin
Lithostratigraphy Tabul Formation Onshore geology Hydrocarbon exploration , Nunukan Island ,Kalimantan
Nunukan Island is located in Northeast Kalimantan Basin, one of prolific basin in western Indonesia. However, this island lies in northern verge of the basin and hydrocarbon exploration were limited before the 1940s. No detail geological fieldworks has been published. This paper attempts to share geological information obtained from few accessible outcrops, particularly from the western part of the island where previous oil drilling were carried out. Most of the island have been built by Tabul Formation, which was also the main objective of reservoir for hydrocarbon exploration. It is composed of claystones, siltstones, and sandstones interbeds, deposited in transitional environment during Late Miocene. They exhibit coarsening upward sequence, the lower part composed of heterolitic sandstones deposited in tidal flats, and the upper part composed of arkosic sandstones deposited in distributary channels and mouthbars. The eastern coastal strip was constructed by Tarakan conglomerates, which have been deposited in fluvio-deltaic environment in Pliocene, unconformably over the Tabul clastics. Those Neogene deposition of paleo-Simengaris Delta apparently deformed and inverted in Plio-Pleistocene, contemporaneously with basaltic volcanism which spread widely over northeastern Borneo, which also observed in the northern half of the Nunukan Island
Geological Engineering Department Universitas Gadjah Mada
2017-11-13
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/30255
10.22146/jag.30255
Journal of Applied Geology; Vol 2, No 1 (2017); 25-35
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/30255/18265
Copyright (c) 2017 Salahuddin Husein
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oai:jurnal.ugm.ac.id:article/30256
2018-11-14T03:04:51Z
jag:ART
Assessment of Groundwater Contamination Hazard by Nitrate in Samas Area, Bantul District, Yogyakarta, Indonesia
Souvannachith, Thilavanh
Eka Putra, Doni Prakasa
Hendrayana, Heru
Nitrate Groundwater vulnerability Groundwater contaminant loading Groundwater contaminant hazard, Bantul, Indonesia
Groundwater resource is an essential for various purposes in Bantul district, Yogyakarta Special Province, Indonesia, especially on Poncosari village where the water supply are depending on shallow groundwater resources. On this village, most of the houses using dug wells to provide their water needs and applying inappropriate on-site sanitation system, however there are also difference land uses. This condition increase the hazard of groundwater contamination by fecal coli bacteria and nitrate. Therefore, this research aims in term of three main objectives: firstly, to know the level of nitrate concentration in groundwater, secondly, to assess groundwater vulnerability and thirdly, to assess the level of groundwater contaminant hazard. Hydrogeology observation was conducted and 47 water samples (44 groundwater samples and 3 surface water samples) were collected from different land use type and analyze for nitrate (NO 3) content. Methodology used to assess the groundwater vulnerability was Simple Vertical Vulnerability method and the groundwater contamination hazard built based on the combination of groundwater vulnerability and nitrate loading potential map. Results show that groundwater concentrations of nitrate range from 0.09–74.80 mg/L and the highest concentration found in the settlement area. Assessment of groundwater vulnerability reveals three areas of moderate, moderate high and high classes of vulnerability due to shallow groundwater and the sandy dominated overlying material in the study area. Combination of groundwater vulnerability and nitrate loading potential map indicated that groundwater contaminant hazard of nitrate range from low to high class. High class of hazard located in the settlement area, and low hazard of nitrate contamination found in the irrigated rice field area
Geological Engineering Department Universitas Gadjah Mada
2017-11-13
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/30256
10.22146/jag.30256
Journal of Applied Geology; Vol 2, No 1 (2017); 36-47
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/30256/18266
Copyright (c) 2017 Thilavanh Souvannachith, Doni Prakasa Eka Putra, Heru Hendrayana
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oai:jurnal.ugm.ac.id:article/39979
2018-11-14T02:58:26Z
jag:ART
Hydrogeochemical Characterization of GeothermalWater in Arjuno-Welirang, East Java, Indonesia
Harijoko, Agung
Martadiastuti, Vanadia
Warmada, I Wayan
Yonezu, Kotaro
Water chemistry Geothermal Water chemistry _ Geothermal - Arjuno-Welirang - East Java - Indonesia
Arjuno-Welirang Volcanic Complex (AWVC) is one of geothermal fields whichlocated in East Java province, Indonesia. It belongs to a Quarternary volcanic arc and has potential for development of electricity. The field is situated in a steep volcanic terrain and there are only few geothermal manifestations, i.e., hot springs, fumaroles, solfataras, steaming ground and hydrothermal alteration. This study aims to classify the type and source of geothermal fluid and to estimate the reservoir condition of Arjuno- Welirang geothermal system. Data are obtained from collecting water samples including hot springs, cold springs, river waters and rain water, then they are analyzed using ICP-AES, titration and ion chromatography.All thermal waters have temperatures from 39.5–53°C and weakly acidic pH (5.2–6.5). Cangar and Padusanhot springs show bicarbonate water, formed by steam condensing or groundwater mixing. On the other hand, Songgoriti shows Cl-HCO3 type, formed by dilution of chloride fluid by either groundwater or bicarbonate water during lateral flow. All of the waters represent immature waters, indicating no strong outflow of neutral Cl-rich deep waters in AWVC. Cl/B ratios show that all water samples have a similar mixing ratio, showing they are from common fluid sources. However, Padusan and Songgoriti have higher Cl/B ratios than Cangar, suggesting that geothermal fluids possibly have reacted with sedimentary rocks before ascending to the surface. All waters were possibly mixed with shallow groundwater and they underwent rock-water reactions at depth before ascending to the surface. An estimated temperatures reservoir calculated using CO2 geothermometer yielded temperatures of 262–263 °C based on collecting of fumarole gas at Mt. Welirang crater. According to their characteristics, Cangar and Padusan are associated with AWVC, while Songgoriti is associated with Mt. Kawi.
Geological Engineering Department Universitas Gadjah Mada
2018-10-23
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/39979
10.22146/jag.39979
Journal of Applied Geology; Vol 2, No 2 (2017); 59 - 69
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/39979/22698
Copyright (c) 2018 Agung Harijoko, Vanadia Martadiastuti, I Wayan Warmada, Kotaro Yonezu
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oai:jurnal.ugm.ac.id:article/39981
2018-11-14T02:58:26Z
jag:ART
Removal of Selenium (Se) and Zinc (Zn) inWater by Using Natural Zeolitic Tuff as Adsorbent from Tegalrejo Area, Gedangsari District, Gunungkidul Regency, Special Province Yogyakarta, Indonesia
Thepgnothy, Manixone
Eka Putra, Doni Prakasa
Wilopo, Wahyu
Natural zeolitic tuff Selenium Zinc Sorption isotherm Indonesia
Heavy metals are one of the most hazardous pollutant in the water. Thereare many methods for heavy metals remediation such as precipitation, oxidation, reverseosmosis, ion exchange and sorption by reactive materials. Zeolite is one of reactive materials have been used for water remediation. Therefero, in this the capability of zeolite from Gedangsari District, Gunung Kidul Regency, Special Province of Yogyakarta, Indonesia, will be invetigated to remidiate contaminated water by selenium (Se) and Zinc (Zn). To answer this objective, several samples of natural zeolitic tuff were taken and charaterized. Laboratory experiment was done by batch test. The results showed that natural zeolitic tuff is an effective adsorbent of Se and Zn and holds great potential material to remove heavy metals in water. The sorption isotherms of Se and Zn confirmed to type of Langmuir or Freundlich isotherms.
Geological Engineering Department Universitas Gadjah Mada
2018-10-23
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/39981
10.22146/jag.39981
Journal of Applied Geology; Vol 2, No 2 (2017); 70 - 77
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/39981/22699
Copyright (c) 2018 Manixone Thepgnothy, Doni Prakasa Eka Putra, Wahyu Wilopo
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oai:jurnal.ugm.ac.id:article/39983
2018-11-14T02:58:26Z
jag:ART
Landslide Susceptibility Mapping Using Analytical Hierarchy Process, Statistical Index, Index of Enthropy, and Logistic Regression Approaches in the TinalahWatershed, Yogyakarta
Indrawan, I Gde Budi
Xiong, Tee
Eka Putra, Doni Prakasa
Analytical hierarchy process - Index of entropy - Landslide susceptibility - Logistic regression - Statistical index.
A number of approaches have been used inlandslide susceptibility mappingand there seems to be no agreement on which approach provides best prediction of landslide susceptibility. This study was conducted to develop landslide susceptibility mapsof the Tinalah watershed at a 1:25000 scale using analytical hierarchy process (AHP), statistical index (SI), index of entropy (IOE) and logistic regression (LR) approaches and to compare performance of those approaches in predicting landslide susceptibility. Out of 114 landslides identified during site investigation, 86 landslides were selected for landslide susceptibility analyses, while the remaining 28 landslides were used to verify the results. Factors controlling landslides considered in the landslide susceptibility mapping were slope inclination, lithology, distance to fault, land use, distance to river, and rainfall. Analyses of Receiver Operating Characteristics (ROC) curves showed that the AUC values of the landslide susceptibility maps derived using AHP, SI, IOE and LR approaches were 0.784, 0.688, 0.827 and 0.834, respectively. The LR approach was concluded to perform the best in predicting landslide susceptibility in the study area.
Geological Engineering Department Universitas Gadjah Mada
2018-10-23
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/39983
10.22146/jag.39983
Journal of Applied Geology; Vol 2, No 2 (2017); 78 - 93
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/39983/22700
Copyright (c) 2018 I Gde Budi Indrawan, Tee Xiong, Doni Prakasa Eka Putra
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/39988
2018-11-14T02:58:26Z
jag:ART
Basin Evolution Palispatic Model of Bonaparte Basin, Australia Northwest Shelf
Ricardo, Nomensen
Amijaya, Hendra
Husein, Salahuddin
Neogene collision - Basin evolution - Palispatic model - Petroleum system - Australian northwest self.
This research area is located on the Australian NW Shelf close to the westernedge of the Sahul Platform. This research is aimed to generate the palispatic basin model of Bonaparte Basin, Australian Northwest Shelf. It is to predict the impact of Neogene collision on the petroleum system distribution on Australian Northwest Shelf. The main data used in this research are seismic data using qualitative method analysis. The well data is used to well-seismic tied. After data acquisition, the seismic data are interpreted based on the horizon and structure interpretation. These interpretation are to reconstruct the basin evolution thorough geologic time. According to data analysis, the basin evolution palispatic model are divided into Paleo-proterozoic, Paleozoic, Triassic, Early Jurassic, Middle Jurassic, Late Jurassic, Early Cretaceous, Late Cretaceous, Early Eocene, Late Miocene and Recent condition. Regional tectonically there are at least three important events in NW Shelf: Middle Triassic-Jurassic NNE–SSW extension phase, Late Jurassic NE–SW extension phase and the Neogen collision phase; the Neogen collision effects on Northwest Shelf Australia. These three events contributed in forming and disturbing the Paleozoic and Mesozoic petroleum system in Bonaparte basin especially.
Geological Engineering Department Universitas Gadjah Mada
2018-10-23
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/39988
10.22146/jag.39988
Journal of Applied Geology; Vol 2, No 2 (2017); 94 - 108
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/39988/22701
Copyright (c) 2018 Nomensen Ricardo, Hendra Amijaya, Salahuddin Husein
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/39993
2019-01-07T01:51:55Z
jag:ART
Improvement of Engineering Properties of Residual Soil of Tuff Breccia by Electro-Kinetic Method
Eka Putra, Doni Prakasa
Aung, Hnin Thazin
Indrawan, I Gde Budi
Electro-kinetic - Soil improvement - Slope stability - Tuff breccia.
This paper presents the results of an experimental study that was conductedto improve engineering properties of residual soil of tuff breccia by applying the electrokinetic method. The soil samples were taken from a slope in a high susceptible landslide area in the Kulon Progo, Yogyakarta, Indonesia. The electro-kinetic experiments were conducted using a clear glass tank of 60 cm 30 cm 30 cm size, a 13 V power pack to supply the voltage, and aluminum electrodes. The results showed that the pH value of anolyte decreased while that of catholyte increased during the treatment. The Atterberg’s limits of all soil samples decreased, while the shear strengths increased. XRD and SEM analyses indicated that there were no mineral changes after electro-kinetic experiments. However, the soil structure changed and became denser. The increased soil strength after electro-kinetic treatment would likely improve stability of natural slopes.
Geological Engineering Department Universitas Gadjah Mada
2018-10-23
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/39993
10.22146/jag.39993
Journal of Applied Geology; Vol 3, No 1 (2018); 1 - 10
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/39993/22787
Copyright (c) 2018 Doni Prakasa Eka Putra, Hnin Thazin Aung, I Gde Budi Indrawan
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oai:jurnal.ugm.ac.id:article/39996
2019-01-07T01:51:55Z
jag:ART
Groundwater Flow Modeling in the Malioboro, Yogyakarta, Indonesia
Satapona, Alwan
Eka Putra, Doni Prakasa
Hendrayana, Heru
Groundwater flow model - Groundwater table - Malioboro - Yogyakarta - Indonesia.
Malioboro is a famous tourism area in Yogyakarta City, in which there aremany hotels and increases every years and this follows by the increasing needs of fresh water taken from underlying groundwater. The decreasing of groundwater table become a great issue on this area, therefore the objective of the research is to predict groundwater table change in the next 10 years due to increase abstraction of groundwater. To answer the mentioned objectives, field observation of dug wells and collection of secondary data of log bores also calculation of recharge and water abstraction are used to understand and build the conceptual model of local groundwater system. The prediction is done by conducting simulation on a numerical groundwater model by using MODFLOW. The local groundwater system consists of two aquifer layers; upper aquifer and lower aquifer which separated incompletely by clay layer. Simulation is conducting by distributing the groundwater pumping for domestic and non-domestic utilization by dug wells in the upper aquifer, whereas deep wells non-domestic utilization are applied only in the lower aquifer. Simulations are conducted twice for the recent day and the next ten years predictionof groundwater abstraction. In the case of groundwater abstraction in the next tenyears, dug wells abstraction and deep wells pumping are setting to 4727 m3/day and 1648 m3/day, respectively. The groundwater pumping rates is representing increase of groundwater withdrawal of users in the range only between 0.2–1.2 % per year compare to the recent condition. The simulation reveals change occur on groundwater table depth and pattern. In average, the groundwater table will decrease of about 0.25 meter.
Geological Engineering Department Universitas Gadjah Mada
2018-10-23
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/39996
10.22146/jag.39996
Journal of Applied Geology; Vol 3, No 1 (2018); 11 - 22
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/39996/22695
Copyright (c) 2018 Alwan Satapona, Doni Prakasa Eka Putra, Heru Hendrayana
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oai:jurnal.ugm.ac.id:article/40001
2019-01-07T01:51:55Z
jag:ART
Rainfall Thresholds for Landslide Prediction in Loano Subdistrict, Purworejo District Central Java Province
Ferardi, Farma Dyva
Wilopo, Wahyu
Fathani, Teuku Faisal
Landslide - Prediction - Rainfall thresholds - Loano Subdistrict - Central Java
Purworejo Districtis a district with high disaster risk index in Indonesia, especiallylandslide. The main factor that triggers the landslide is rainfall. However, therehas been no comprehensive research on the intensity of rain that triggered the landslide in Purworejo District, especially in the Sub district of Loano. Huge landslide occurred in Loano Sub district at 2016, causing 46 deaths and damages in several houses. Therefore, it is necessary to study the prediction of landslide based on rainfall data and geological conditions of Loano Sub district, Purworejo District. The objective of this research is to analyze the mechanism of landslide, to analyze the rainfall that triggers the landslide and to estimate the intensity of rain that can triggers the landslide. The research method is collecting historical data of landslides in Purworejo District along with rainfall data, geological observation that includes the condition of lithology, geomorphology and hydrogeology,undisturbed soil sampling in Loano Sub district. The prediction of landslide uses empirical methods which were then simulated by Geostudio 2012 Software. The results show that the type of landslide is sliding, the main control factor is the steep slope and the thickness of the soil. The rainfall threshold triggering landslide are as follows for lithology andesite breccia I = 81.782 D1.197, sandy clay I = 92.579 D0.13, and andesite intrusionI = 145.32 D0.338.
Geological Engineering Department Universitas Gadjah Mada
2018-10-23
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/40001
10.22146/jag.40001
Journal of Applied Geology; Vol 3, No 1 (2018); 23 - 31
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/40001/22696
Copyright (c) 2018 Farma Dyva Ferardi, Wahyu Wilopo, Teuku Faisal Fathani
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/40005
2019-01-07T01:51:55Z
jag:ART
CanWe Identify Macroscopic Texture of Coal under Microscopic Analysis Using Standard Petrographic Method?
Anggara, Ferian
Pamungkas, Diyan
Prakoso, Wildan Guntur
Macroscopic texture - Macroscopic texture - Coal - Microscopic texture
Macroscopic texture in coals is not much getting attention to identify, becauseit is believed it doesn’t hold much information about the coal characteristics. It is nottrue because some of important coal characteristics lie in its organic content which is reflected in its macroscopic texture (Moore, 2016). Conventional petrographic method using crushed sample cannot distinguish such feature microscopically, since the macroscopic texture will lose its integrity during the preparation. Petrographic analysis using block samples provide information about microscopic texture that can represents its macroscopic texture. Components in textural analysis are divided into three types based on the size, band (more than 800 μm), lens (20–800 μm) and matrix (less than 20 μm). From the ratio between these three types of component and statistics, later it can be determined that nonbandedsamples have less value of ratio between band and lens per matrix, and there will be a borderline between banded and non-banded samples based on the value. Banded texture in macroscopic feature consists of vitrain bands, and under microscope it can beidentified as band and lens of macerals, while non-banded samples will mostly consist ofmatrix texture. Thus, it can be concluded that petrographic analysis using block samplescan be used to identify microscopic texture representing the macroscopic texture, and can be proven through statistics as used in this research.
Geological Engineering Department Universitas Gadjah Mada
2018-10-23
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/40005
10.22146/jag.40005
Journal of Applied Geology; Vol 3, No 1 (2018); 32 - 40
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/40005/22785
Copyright (c) 2018 Ferian Anggara, Diyan Pamungkas, Wildan Guntur Prakoso
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/40862
2018-11-14T02:58:26Z
jag:ART
Preliminary Study of Liquid Hydrocarbon Biodegradation By Indigineous Bacteria Isolated from Wonocolo Village, Bojonegoro District, East Java Province
Wilopo, Wahyu
Dwi Kusumo, Bramono
Retnaningrum, Endah
Water pollutan-Biodegradation - Moraxella –Wonocolo-East Java
Aquatic environmental pollution due to petroleum waste can cause disruption to the environment and damaging of flora and fauna. It has been reported that petroleum contaminatin occurs in the Bengawan Solo river, East Java Province. Liquid hydrocarbon waste pollution can be remediate through various processes, one of them is biodegradation. Biodegradation a part of bioremediation, is the process by which organic substances are decomposed by microorganisms into simpler substances such as carbon dioxide, water and ammonia. Bioremediation has minor side effects compare to other methods because it’s more effective, efficient, economical and eco-friendly through biological process. This study aims to identify bacteria for liquid hydrocarbon degradation from the rivers in Wonocolo Village, Bojonegoro District and to determine maximum percentage of inoculum to produce the highest efficiency of liquid hydrocarbons degradation. Based on phenotypic characters, the selected bacteria was identified as a genus of Moraxella. Its bacterium with a concentration of 2 % can reduce hydrocarbons to a maximum of 0.67 % per hour at the exponential phase growth.
Geological Engineering Department Universitas Gadjah Mada
2018-11-13
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/40862
10.22146/jag.40862
Journal of Applied Geology; Vol 2, No 2 (2017); 109 - 114
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/40862/22786
Copyright (c) 2018 Wahyu Wilopo, Bramono Dwi Kusumo, Endah Retnaningrum
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/42442
2018-11-14T03:04:51Z
jag:ART
Geology, Geochemistry and Hydrothermal Fluid Characteristics of Low Sulfidation Epithermal Deposit in the Sangon Area, Kokap, Special Region of Yogyakarta
Pramumijoyo, Pranayoga
Idrus, Arifudin
Warmada, I Wayan
Yonezu, Kotaro
Low sulfidation epithermal - Andesite - Alteration - Ore mineralization - Hydrothermal fluid - Sangon
On the basis of the previous studies and reconnaissance survey in the studyarea covering Sangon, Kalirejo, Kokap Sub-district, Kulon Progo Regency, Special Region of Yogyakarta, it reveals some facts of the occurrence of quartz veins with massive, crustiform, comb, drusy cavity, saccharoidal, granular, and reniform/mammillated textures, the appearance of lattice bladed barite and hydrothermal breccia veins. Referring to those characteristics, the deposit type in the study area is interpreted to be low sulfidation epithermal type. This study is aimed to understand and characterize the geological condition, rock and ore geochemistry and the mineralizing fluids. The alteration and ore mineralization are almost observed in entire rock units particularly the intrusive andesite 1. Their formation is controlled by the tension fractures (NW–SE and NE–SW) which associate with sinistral strike slip faults (NE–SW), dilational jog (NNW–SSE), oblique normal fault (WNW–ESE), and predictable normal fault at the NE of study area (NW–SE). The alteration zones are developed to be silica-clay (quartz-illite-kaolinite-kaolinite/smectite), argillic (smectite-illite/smectite), and propylitic (chlorite-calcite±epidote). The precipitationof ore minerals is controlled by boiling, mixing, and wall-rock alteration, and canbe found in the quartz veins (quartz-adularia-sericite) and disseminated in the alteration zones, which their high variability is only can be found in the quartz veins, including pyrite, sphalerite, chalcopyrite, galena, marcasite, and arsenopyrite. Based on the ICPAES measurement of 5 quartz vein samples, the Cu, Zn, Pb, and As grade reach about 5,171 ppm, 8,995 ppm, 6,398 ppm, 34.1 ppm, and 1,010.5 ppm, respectively. Gold is not detected. Fluid inclusion microthermometric analysis shows Th of 242.1–257.6 °C and salinity of 1.57–3.87 wt.% NaCl equiv., which indicate a depth below the paleosurface of 384–516 m, and pressure of 101.7–136.6 bar. The ore deposit in the study area is interpreted to be a deep basemetal low sulfidation epithermal type. Gold might be depleted in this epithermal type.
Geological Engineering Department Universitas Gadjah Mada
2017-01-07
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/42442
10.22146/jag.42442
Journal of Applied Geology; Vol 2, No 1 (2017); 48 - 58
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/42442/23465
Copyright (c) 2017 Pranayoga Pramumijoyo, Arifudin Idrus, I Wayan Warmada, Kotaro Yonezu
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/42445
2019-01-07T01:51:55Z
jag:ART
Emplacement Temperature of the Overbank and Dilute-Detached Pyroclastic Density Currents of Merapi 5 November 2010 Events using Reflectance Analysis of Associated Charcoal
Wibowo, Haryo Edi
Purnama Edra, Anggun
Harijoko, Agung
Anggara, Ferian
Emplacement temperature - PDCs - Merapi - Reflectance analysis - Charcoal.
Merapi eruption in 2010 produced 17 km high column of ash and southward pyroclastic density current (PDC). Based on the deposits characteristics and distributions, the PDC is divided into channel and overbank facies (pyroclastic flow), and associated diluted PDC (pyroclastic surge). The hot overbank PDCs and the associated dilute-detached PDCs are the main cause of high casualty (367 fatalities) in medial-distal area (5–16 km), especially near main valley of Kali Gendol. We reported the emplacement temperature of these two deposits using reflectance analysis of charcoal. We used both entombed charcoals in the overbank PDC and charcoals in singed house nearby. Samples were collected on 6–13 km distance southward from summit. Charcoalification temperatures of the entombed charcoals represent deposition temperature of the overbank PDCs, whereas those of charcoals in the singed house resembles temperature of the associated dilute-detached PDCs. Results show mean random reflectance (Ro%) values of entombed charcoal mainly range 1.1–1.9 correspond to temperature range 328–444 °C, whereas charcoal in singed house range 0.61–1.12 with estimated temperature range 304–358 °C. The new temperature data of the dilute-detached PDCs in the medial-distal area is crucial for assessing impact scenarios for exposed populations as it affects them lethally and destructively
Geological Engineering Department Universitas Gadjah Mada
2018-12-07
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/42445
10.22146/jag.42445
Journal of Applied Geology; Vol 3, No 1 (2018); 41 - 51
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/42445/23466
Copyright (c) 2018 Haryo Edi Wibowo, Anggun Purnama Edra, Agung Harijoko, Ferian Anggara
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/48592
2019-08-14T00:40:41Z
jag:ART
Determination of Stability During First Impounding in Jatigede Earth Dam
Fathani, Teuku Faisal
Minmahddun, Anafi
Faris, Fikri
Rockfill dam, Seepage , Pore water pressure , Slope stability, Safety factor , Slide2.
The Jatigede Dam is a multi-purpose rockfill dam located in Sumedang Regency, West Java Province. The construction of the Jatigede Dam started in 2008 and it is the second largest dam in Indonesia after the Jatiluhur Dam. As one of the vital facilities, it is highly necessary to evaluate the stability of the Jatigede Dam to avoid dam collapse. First reservoir filling is one of the factors affecting the dam stability; therefore, this research aims to evaluate the Jatigede Dam stability during impounding. The transient seepage analysis was conducted to evaluate the pore pressure change during impounding. The result of seepage analysis was used to analyze the dam stability using the limit equilibrium method with Rockscience software of Slide2. The results of the seepage analysis shows that the rise of the reservoir water level affects the upstream slope stability. The safety factor of the upstream slope changes during the impounding process. All thesafety factors for the upstream and downstream slopes during impounding still meet theminimum safety factor criteria required.
Geological Engineering Department Universitas Gadjah Mada
2019-08-07
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/48592
10.22146/jag.48592
Journal of Applied Geology; Vol 3, No 2 (2018); 1-10
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/48592/25152
Copyright (c) 2019 Teuku Faisal Fathani, Anafi Minmahddun, Fikri Faris
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/48594
2019-08-14T00:40:41Z
jag:ART
Correlation of P-wave Velocity with Rock Quality Designation (RQD) in Volcanic Rocks
Fathani, Teuku Faisal
Salaamah, Ainul Fatayaatis
Wilopo, Wahyu
Seismic refraction , Rockfill dam , Rock mechanic , Lithology , Geological mapping
One important part of rock mass investigation is the geomechanical assessment in terms of rock mass classification systems. Rock mass classification is one of the most efficient methods in rock mechanics to provide a basic understanding of rock mass characterization. Rock mass properties can be determined by a seismic refraction survey as an indirect geophysical assessment. In this study, the P-wave velocity from seismic refraction was compared with the Rock Quality Designation (RQD) from the boreholes. The empirical correlation between the RQD and the P-wave velocity was found by using the linear regression analysis. The RQD value estimated from the P-wave velocity can beapplied for tropical environment study with geological conditions of volcanic rocks. This study helps to estimate and predict the subsurface rock quality, to reduce investigation costs, and to improve understanding of subsurface rock quality.
Geological Engineering Department Universitas Gadjah Mada
2019-08-07
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/48594
10.22146/jag.48594
Journal of Applied Geology; Vol 3, No 2 (2018); 11-21
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/48594/25153
Copyright (c) 2019 Teuku Faisal Fathani, Ainul Fatayaatis Salaamah, Wahyu Wilopo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/48595
2019-08-14T00:40:41Z
jag:ART
The Quality and Distribution of Andesite Rock for Construction Materials in Kokap and Temon District, Kulon Progo Regency, Yogyakarta–Indonesia
Lenggono, Tego
Eka Putra, Doni Prakasa
Setianto, Agung
Andesite, Construction material , Kulon Progo, Yogyakarta, Indonesia.
The construction projects that are currently being carried out in Kulon Progo Regency, Yogyakarta Special Province, Indonesia, started on 2018, are large-scale projects. The projects include the construction of airports, seaports, industrial estates, southern crossing lanes and the construction of Menoreh lanes. The large-scale projects require a very large supply of andesite rocks for material construction. In Kulon Progo Regency itself, there is a huge potential of andesite rock relate to two geological formations (Kebo Butak and Andesite Intrusion) exist in the region, which is found mostly in Kokap District and partly in Temon District. One parameter that determines the quality of andesite rock is their compressive strength. Due to weathering, not all of the andesite in both formation can be classified as good quality rocks. According to Indonesian Standard, theminimum compressive strength of natural stone for stakes and curbstone is 500 kg/cm2 , for lightweight building foundation is 800 kg/cm2 , for medium building foundations is 1000 kg/cm 2and for heavy building foundations is 1500 kg/cm 2 . Based on this background, this paper have objectives to know the quality of andesite rock exist in the research area and to determine the zonation of good quality andesite rock for building and road materials in the research area. Field observation were conducted to map the occurrence of andesite rock. Totally 68 rock samples were collected during field observation and tested by point load test method to know its compressive strength value. The distribution of good quality rock in the research area were determine based on spatial analysis procedure in geographical information system. Results show that andesite rocks found in research area have a compressive strength ranging from 167.12 kg/cm 2 to 2783.37 kg/cm 2 . From 53 samples taken from igneous rock intrusion, it showed that 7.55 % had low quality, 13.21 % had medium quality, 30.19 % had good quality and 49.06 % had very good quality. From the 16 samples taken from the Kebobutak Formation, it showed that 12.50 % had low quality, 18.75 % had good quality and 67.75 % had very good quality. The final map of rock quality zonation reveals 28.92 % of research area classify as low quality, 2.52 % medium quality, 37.68 % good quality and 30.88 % very good quality. It can be concluded that almost 70 % of andesite in the Kokap and Temon District can be used for the running large scale projects.
Geological Engineering Department Universitas Gadjah Mada
2019-08-07
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/48595
10.22146/jag.48595
Journal of Applied Geology; Vol 3, No 2 (2018); 22-31
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/48595/25154
Copyright (c) 2019 Tego Lenggono, Doni Prakasa Eka Putra, Agung Setianto
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/48596
2019-08-14T00:40:41Z
jag:ART
Stratigraphy and Foraminiferal Biostratigraphy of Sentolo Formation in Sedayu Area: Local Unconformity Identification in Early Pliocene
Akmaluddin, Akmaluddin
Agustin, Muhammad Virgiawan
Kurniawan Adi, Ma’ruf
Biostratigraphy , Local unconformity identification , Early Pliocene , Sentolo Formation.
The study area is located in Sedayu District, Bantul Regency, Special Region of Yogyakarta Province which belongs to the Sentolo Formation. This area is an interesting place to study because there are erosional boundaries that indicate an unconformity in the Sentolo Formation. In this study, stratigraphic measurements and sampling were carried out in the field, then the samples were prepared and analyzed for the content of planktic and benthic foraminifera fossil. The results of the analysis are the determination of biozonation, paleobathimetry, and identification of sedimentation rates and unconformity. From the data analysis, ware known that the Sentolo Formation in Sedayu area can be divided into three lithofacies, namely thickening upward calcareous sandstone – calcareous siltstone facies, channel calcareous sandstone – calcareous siltstone facies andthinning upward limestone facies. Based on the biostratigraphy analysis, can be divided into four biozonations, namely the PL1A, PL1B, PL1C, and PL2 zones which are included in the Early Pliocene age. There is an unconformity in the facies boundary of the channel calcareous sandstone – calcareous siltstone facies with thinning upward limestone facies, identified by the presence of an erosional boundary at that interval and also supported by sudden changes in paleobatimetry from Upper Bathyal to Middle Neritic. The sedimentation rate identified in this area has a value of 15.5 m / Ma which identified in the lower facies. The extrapolation results of age and sedimentation rates concluded that the unconformity occurred at 4.46–4.20 Ma, and eroded 4.03 m thick of sedimentary rocks
Geological Engineering Department Universitas Gadjah Mada
2019-08-07
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/48596
10.22146/jag.48596
Journal of Applied Geology; Vol 3, No 2 (2018); 32-47
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/48596/25155
Copyright (c) 2019 Akmaluddin Akmaluddin, Muhammad Virgiawan Agustin, Ma’ruf Kurniawan Adi
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/48598
2019-08-14T00:40:41Z
jag:ART
Mineralogical Characteristics of Hydrothermally-altered Andesite in Kalirejo Village and The Surrounding Areas, Indonesia
Indrawan, I Gde Budi
Putra Pratama, Diyan Aditya
Warmada, I Wayan
Hydrotermal alteration, Mineralogical characteristics, Andesite , Kalirejo Village, Indonesia.
Type and intensity of hydrothermal alterations affect rock engineering properties and slope stability. Identification of mineralogical characteristics of rocks is essential in determination of rock slope failure mechanism in a hydrothermal alteration zone. This research was conducted to identify mineralogical characteristics of hydrothermallyaltered andesite in Kalirejo Village and surrounding areas, Indonesia. The research was conducted by field observation and laboratory analyses involving petrographic and X-ray Powder Diffraction (XRD) analyses. The results showed that the research area was dominated by argillic alteration type and high alteration intensity implying high susceptibility to slope failures
Geological Engineering Department Universitas Gadjah Mada
2019-08-07
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/48598
10.22146/jag.48598
Journal of Applied Geology; Vol 3, No 2 (2018); 48-57
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/48598/25156
Copyright (c) 2019 I Gde Budi Indrawan, Diyan Aditya Putra Pratama, I Wayan Warmada
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/48735
2019-11-26T09:00:15Z
jag:ART
Landslide Risk Assessment for Designing Monitoring and EarlyWarning System
Fathani, Teuku Faisal
Anh Bui, Tuan
Wilopo, Wahyu
Slope stability analysis, Groundwater, Rainfall intensity, Movement velocity , Mitigation, Monitoring devices
Landslide is the most frequent natural disaster in Yogyakarta, Indonesia. In the mid-March 2018, a few cracks appeared in the north of the hill in the Pendoworejo Village, Kulon Progo District, Yogyakarta Special Province. The landslide movement of this area still threatens the residents and makes them evacuated due to their fear upon potential landslide disaster. In order to reduce the risk, landslide investigation and risk assessment were conducted. The stability analysis focused on the relationship of the displacement,the velocity and the fluctuation of groundwater level due to the rainfall intensity. Then, a monitoring and warning system was designed as a non-structural mitigation effort. Based on the preliminary investigation on April 2018, there was no evidence of mass movement on the west and south part of the hill. On the other hand, the north part area was estimated to have risk as indicated by the occurrence of many cracks. Based on the result of analysis, the fluctuation of the groundwater level rose or dropped substantially before and after heavy rainfall. In the rainy season, the velocity and the displacement increased slightly in the first three months and grew rapidly afterward. In fact, the landslide risk increased in every rainy season. Therefore, the risk could be more dangerous in the future.
Geological Engineering Department Universitas Gadjah Mada
2019-08-14
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/48735
10.22146/jag.48735
Journal of Applied Geology; Vol 4, No 1 (2019); 1-8
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/48735/25191
Copyright (c) 2019 Teuku Faisal Fathani, Tuan Anh Bui, Wahyu Wilopo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/48736
2019-11-26T09:00:15Z
jag:ART
Rock Mass Characterization for Assessment of Safe Cut Slope and Rock Bearing Capacity at Gondang Dam Site, Karanganyar, Indonesia
Indrawan, I Gde Budi
Sochan, Sao
Kuncoro, Dwi Agus
Bearing capacity ,Geological strength index ,Rock mass characterization , Rock mass quality , Safe cut slope
This paper presents results of surface rock mass characterization for assessment of safe cut slopes and allowable bearing capacity of foundation rocks at the construction area of Gondang Dam. The rock mass characterization involved determination of intact rock engineering properties and rock mass quality based on the Geological Strength Index. The rock mass characterization results showed that the research area consisted of moderately to highly weathered and very weak to weak andesite breccia and andesite tuff breccia. The andesite breccia had very poor to fair rock mass quality, while the andesite tuff breccia had poor to fair rock mass quality. The research area was divided into three zones of safe cut slope and allowable bearing capacity. Landslides occurred at natural slopes having poor to very poor rock mass quality and inclinations greater than the determined safe cut slopes.The foundation rock of the embankment dam had fair rock massquality and 135–280 T/m2 allowable bearing capacity
Geological Engineering Department Universitas Gadjah Mada
2019-08-14
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/48736
10.22146/jag.48736
Journal of Applied Geology; Vol 4, No 1 (2019); 9-14
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/48736/25192
Copyright (c) 2019 I Gde Budi Indrawan, Sao Sochan, Dwi Agus Kuncoro
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/48737
2019-11-26T09:00:15Z
jag:ART
Chromium Precipitation Activity and Molecular Characterization of Sulfate-Reducing Bacteria
Retnaningrum, Endah
Yulianti, Dwiana Muflihah
Wilopo, Wahyu
Sulfate-reducing bacteria ,16S rRNA ,Chromium
Chromium is one of the metals used in many areas of industry., However, chromium is toxic to organisms when present in large quantities in the environment. One of the method for treatment of hazardous waste containing chromium in the aquatic environment can be removed by bioremediation using sulfate-reducing bacteria (SRB). Therefore, the purpose of this research were to analyze the chromium precipitation activity of sulfate-reducing bacteria isolated from sulfate reducing bioreactor and its molecular identification using 16S rRNA gene sequences. The result observed that the isolate of sulfate-reducing bacteria (KGP1 strain) has chromium tolerancy ability up to 5 ppm. It also showed that the strain KGP1 could precipitate chromium up to 0.141 ppm (79 %) on 5 days incubation. Based on 16S rRNA gene sequences, this strain identified as Desulfovibrio aerotolerans.
Geological Engineering Department Universitas Gadjah Mada
2019-08-14
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/48737
10.22146/jag.48737
Journal of Applied Geology; Vol 4, No 1 (2019); 15-19
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/48737/25193
Copyright (c) 2019 Endah Retnaningrum, Dwiana Muflihah Yulianti, Wahyu Wilopo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/48738
2019-11-19T07:32:09Z
jag:ART
Geo-mechanics and Hydraulic Conductivity Study of Claystone in Boyolali, Central Java, Indonesia
Budianta, Wawan
Aprianti Popang, Monika
Prastistho, Widyawanto
Takemura, Jiro
Hydraulic conductivity , Initial water content , Swelling ,Wonosegoro- Boyolali claystone.
Claystone middle Miocene age were found in Wonosegoro sub-district, Boyolali region, Central Java, Indonesia. The purpose of the paper is to examine and discuss the geology and typical behavor of this claystone and its micro-level mechanism. The hydraulic conductivity was assessed using consilidated apparatuses; 150 mm diameter column mound using aggregated sample and 60 mm oedometer mould using slurry sample as a reference. Claystone materials used were treated under various conditions. In long term test under constand vertical stress and hydraulic gradient, the hydraulic conductvity decreases with time although the volume of void volume of the sample increased by swelling. Water contens of the individul aggregated increased by swelling, by which strength of particles decreases with and aggregate breakdown was enchanced. As a result, large void created by large particles could be redused in its size, leading the reduction of hydraulic conductuvity. The hydralic conductivities (K values) obtained from the aggregated sample varied in a broad range compared with those from slurry sample. In the test using the higher percentage of gravel-sized aggregate (up until couarse gravel-sized; retained in 26.5 mm sieve), K values changed from 10-5 to 10-7 m/s under vertical stresses from 5 up to 245 kPa. The test was repeated using smaller percentage of gravel-sized aggregate (up until fine gravel-sized, retained in 4.75 mm sieve) and the observed K values changed from 10-5 to 10-10 m/s. While the K values obtained in the specimen made from surry under same vertical stresses was 10-9 to 10-11 m/s. All of the extruded aggregate samples had higher water content than the initial ones, which suggest the alteration mechanism of soled consolidation phase to more deformable plastic phase, whice enables thesample to decrease the void size. These results conclude that using coarse gravel-sized aggregated, which is a reasonable scenario of a practically feasible aggregate size in a field, may noy produce the aimed hydraulic conductivity by the regulated standard. Therefore, breakdown of the aggrgate size and enchament of swelling are crucial factors for the application of the clay stones as a barrier material.
Geological Engineering Department Universitas Gadjah Mada
2019-08-14
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/48738
10.22146/jag.48738
Journal of Applied Geology; Vol 4, No 1 (2019); 20-31
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/48738/25194
Copyright (c) 2019 Wawan Budianta, Monika Aprianti Popang, Widyawanto Prastistho, Jiro Takemura
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/48739
2019-11-19T07:32:53Z
jag:ART
Geology and Petrogenesis of Igneous Rocks from Batur Paleovolcano, Gunungkidul, Yogyakarta: Evidence from their Textures, Mineralogy, and Major Elements Geochemistry
Hakim, Fahmi
Nugroho, Yanuardi Satrio
Permata Dana, Cendi Diar
Dewi Titisari, Anastasia
Ignous rocks , Batur paleovolcano ,Petrogenesis , Calc-alkaline basalt , Major elements ,Yogyakarta
Batur paleovolcano is located in Wediombo Beach area, Gunungkidul Regency, Yogyakarta and is being part of Wuni Formation. Several volcanic products including lava flow, autoclastic breccia and volcanic breccia can be found associated with diorite intrusions. This research is aimed to characterize geological, mineralogical andgeochemical variations of igneous rocks from Batur paleovolcano to understand its petrogenesis. Detailed geological mapping with scale of 1:12,500 is conducted to identify geological aspects and delineate igneous rocks distributions. Igneous rocks and selected wall rocks samples were prepared for laboratory analysis including 8 samples for petrography and 5 samples for ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry) analysis. Several geochemical data from previous study are also added to investigate the geochemical variations. Geological condition of the research area consists of four rock units including colluvial deposit, limestone, andesite lava and diorite intrusion. Geological structures found are normal fault and shear joint where the main stress direction is north–south. Petrography analysis showed that igneous rocks in this research area consist of diorite intrusion and andesite lava with phorphyritic texture. Plagioclase become the most abundant minerals found both as phenocryst phase and groundmass. Hornblende only occur as phenocryst phase in minor amounts as accesory mineral. Major elementsgeochemistry analysis showed the rocks are characterized by intermediate silica with low alkali content. They are can be categorized as calc-alkaline series. However, some samples are fall into tholeiitic series. Major elements variation and textural study also indicate the magma is experienced differentiation process by fractional crystallization mechanism. This study suggests that igneous rocks from Batur paleovolcano is formed by two phases of formation. Earlier phase is the formation of andesite lava in island arc tholeiitic tectonic setting then at the later phase is formation of diorite intrusion in the calc-alkaline basalts tectonic setting.
Geological Engineering Department Universitas Gadjah Mada
2019-08-14
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/48739
10.22146/jag.48739
Journal of Applied Geology; Vol 4, No 1 (2019); 32-42
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/48739/25195
Copyright (c) 2019 Fahmi Hakim, Yanuardi Satrio Nugroho, Cendi Diar Permata Dana, Anastasia Dewi Titisari
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/51627
2020-08-11T06:47:21Z
jag:ART
Determination of Groundwater Recharge Area by Using Hydroisotope Technic of Sei Bingei Area and Surrounding Areas, Langkat Regency, North Sumatra
Nuha, Azmin
Hendrayana, Heru
Wiyatna, Agus Budhie
Eka Putra, Doni Prakasa
Muhammad, Azwar Satry
Determination of Groundwater Recharge Area by Using Hydroisotope Technic of Sei Bingei Area and Surrounding Areas, Langkat Regency, North Sumatra
Geological Engineering Department Universitas Gadjah Mada
2020-08-11
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/51627
10.22146/jag.51627
Journal of Applied Geology; Vol 5, No 1 (2020); 13-24
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/51627/28327
Copyright (c) 2020 Azmin Nuha, Heru Hendrayana, Agus Budhie Wiyatna, Doni Prakasa Eka Putra, Azwar Satry Muhammad
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/53200
2020-02-20T02:56:47Z
jag:ART
Groundwater Flow Modeling at Sejorong Watershed, Sumbawa,West Nusa Tenggara, Indonesia
Eka Putra, Doni Prakasa
Sekar Rianda, Adelide Asriati
Wilopo, Wahyu
Acid mine water - Batu Hijau – Sejorong - Groundwater model
ABSTRACT. Batu Hijau mine pit is known as one of the largest copper pit mine in Nusa Tenggara Barat, Indonesia. Similiar as other copper mine pits in Indonesia, This site also faces acid mine water (AMD) problem. Based on the mine management plan, the AMD generated from this pit is being collected into Santong ponds in the southwest of the pit located in the upstrean area if Sejorong watershed. By the next decade, Batu Hijau mine will be in the closure mine period and it is important to understand the probable move- ment of AMD under the Santong ponds whether the AMD leaked to groundwater or not. This research aims to develop a numerical model of groundwater flow and predict the movement of AMD by applying particle tracking method. Secondary and primary data of geology, hydrology, and hydrogeology. Also, groundwater pumpage discharge infor- mation was collected and analysed to develop hydrogeological conceptual model and the numerical model. The conceptual model of hydrogeological system in the research area is known to be built on unconfined aquifer system from a combination of weathered and fractured volcanic rocks in the upstream to middle part of watershed and majorly by allu- vial and coastal deposits in the downstream area. The thickness of aquifer is vary between 20 to about 300 m and divide into 5 layers in the numerical model, with hydraulic conduc- tivity ranges between 5 to 100 m/day and groundwater recharge is vary between 180 to 700 mm/year from downstream to upstream of watershed. Groundwater flow boundaries in the Sejorong watershed are mainly controlled by topographical feature as water divide boundaries and the existing of Sejorong parennial rivers in the middle of this watershed. Steady state particle tracking results from the numerical groundwater flow model show AMD from Santong ponds may migrate in groundwater only to a distance of about 500 m to the downstream and therefore it is unlikely that AMD seepages from Santong pond may contaminate water in the production wells.
Geological Engineering Department Universitas Gadjah Mada
2020-08-07
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/53200
10.22146/jag.53200
Journal of Applied Geology; Vol 4, No 2 (2019); 43 - 57
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/53200/26743
Copyright (c) 2020 Doni Prakasa Eka Putra, Adelide Asriati Sekar Rianda, Wahyu Wilopo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/53204
2020-02-20T02:58:27Z
jag:ART
Erosion and its Implication on Hydrocarbon Generation in ‘ARD’ Block, Akimeugah Basin,West Papua
Surjono, Sugeng Sapto
Triyogo Varianto, Yohanes Ardhito
Salahuddin, Salahuddin
Western part of Akimeugah basin - Erosion - Tectonostratigraphy - Hydrocarbon generation.
Akimeugah Basin in the western part of Aru Trough is included as a Paleozoic Basin which is one of the potential hydrocarbon-producing basins in Eastern Indonesia. Tectonic evolution in Akimeugah Basin during Cambrian to present has produced a very significant erosion that affected the hydrocarbon generation process. ‘ARD’ Block study uses three exploratory well data including well report and 26 lines of 2D seismic data with a total length of 5,812.55 kilometers and the distance between seismic lines ranging from 10 to 15 kilometers. Seismic data is processed with IHS Kingdom software for tectonostratigraphy analysis, while calculation and erosion analysis are performed by combining well data consisting of sonic, vitrinite reflectance and seismic. To get a burial history model and generation & expulsion period, this study utilizes Petromod software. Five phases of the tectonic evolution led to four times of erosional period with a sediment thickness of 290 – 3,370 feet were loss. The erosion of the sedimentary rocks causes the maturation process delayed more than 200 million years. Burial history in the study area with the erosion absence assumption results a hydrocarbon generation starting from around 210 million years ago. Meanwhile, by considering the loss of eroded sedimentary rocks during four tectonic phases, hydrocarbon generation time just occurred 3.1 million years ago.
Geological Engineering Department Universitas Gadjah Mada
2020-08-07
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/53204
10.22146/jag.53204
Journal of Applied Geology; Vol 4, No 2 (2019); 58 - 72
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/53204/26744
Copyright (c) 2020 Sugeng Sapto Surjono, Yohanes Ardhito Triyogo Varianto, Salahuddin Salahuddin
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/53207
2020-02-20T02:59:42Z
jag:ART
Numerical Evaluation of Earthquake Effect on Cisumdawu Tunnel Stability
Indrawan, I Gde Budi
Nugraha, Jutika Aditya Nugraha
Karnawati, Dwikorita
Cisumdawu Tunnel - Displacement - Earthquake load – Pseudo - static analysis - Strength factor
Cisumdawu Tunnel is located approximately 3.95 km southeast of the activeLembang Fault. Earthquakes induced by movement of the the active the strike-slip fault may influence stability of the twin tunnel. This paper presents results of numerical analyses carried out to demonstrate effect of a worst-case scenario of earthquake load potentially induced by the Lembang Fault on the stability of the Cisumdawu Tunnel. Static and pseudo-static tunnel stability analyses were carried out at 11 observation stations of tunnel face mapping using RS2 finite element package (Rocscience, Inc.). In the pseudo-static analyses, a 0.48 horizontal seismic load coefficient, which was obtained from a deterministic seismic hazard analysis (DSHA) based on a 6.8 maximum magnitude of estimated earthquake sourced from the Lembang Fault using Campbell-Bozorgnia (2014) attenuation relationship, was applied to the finite element models. The numerical analysis results showed that strength factors of the rock masses around the twin tunnel were greater than unity, both under the static and earthquake loads. The forepolling zones, however, appeared to be under an overstressed condition. Reduction of rock strength factor around the tunnel roof due to application of the earthquake load occurred at all observation stations. Total displacement contours of rock masses around the twin tunnel indicated an increased rock mass displacement due to the earthquake load, as compared to that due to the static load. Under the static load, the largest displacement occurred at the tunnel inverts. The predicted roof displacements obtained from this study were in a reasonably good agreement with those obtained from the field measurements. Number of yielded elements and extend of shear and tension failure zones in the rock masses around the twin tunnel also appeared to increase due to the earthquake load. Despite slight tunnel displacement as predicted in the numerical analyses, the worst-case scenario of earthquake load potentially induced by the Lembang Fault may only cause failures of the rock masses around the Cisumdawu Tunnel. To prevent the twin tunnel displacement caused by such relatively severe earthquake loads, however, stabilizing surrounding the relatively poor ground condition may be necessary.
Geological Engineering Department Universitas Gadjah Mada
2020-08-07
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/53207
10.22146/jag.53207
Journal of Applied Geology; Vol 4, No 2 (2019); 73 - 81
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/53207/26745
Copyright (c) 2020 I Gde Budi Indrawan, Jutika Aditya Nugraha Nugraha, Dwikorita Karnawati
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/53208
2020-02-20T03:01:26Z
jag:ART
Total Sulfur and Ash Yield of Tanjung Formation Coal in Sekako, Barito Basin, Central Kalimantan: Implication of Depositional Process
Amijaya, Hendra
Wiranata, Beny
Anggara, Ferian
Perdana, Agung Rizki
Isnadiyati, Oyinta Fatma
Putra Tanggara, Deddy Nan Setya
Barito Basin - Tanjung Formation - Ash - Total sulfur- Syngenetic pyrite
Tanjung Formation is one of the major coal-bearing deposit in the Barito Basin, Central Kalimantan. The distribution of total sulfur and ash yield in coal is closely related to the depositional environment. This study was to determine the total sulfur and ash yield and the interpretation of the dynamics of depositional process. Coal seam A and B generally have low to medium ash yield 2.82 to 9.23 (wt.%, db) and low total sulfur content of <1 (wt.%, db), except for the 6PLY1 coal sample which has total sulfur content that relatively high at 1.55 (wt.%, db). Coal samples 5PLY1A, 5PLY1B, 5PLY3, 5PLY5, 6PLY2, 6PLY4, 6PLY5, 6PLY7, and 6PLY9 which have low to medium ash yield and low total sulfur content <1% (wt.%, db) are formed in the topogeneous mire (freshwater swamp) in a fluvial environment. The total sulfur content was interpreted to be derived mainly from the parent plant materials. Meanwhile, the 6PLY1 coal sample which has an ash yield of 5.83 (wt.%, db) and total sulfur content of 1.55 (wt.%, db) formed in topogeneous mire in an environment that is invaded by sea water, and the total sulfur content were interpreted coming from the parent plant materials and the effect of seawater invasion which is rich in sulfate (SO4) compounds. It is also supported by the occurrence of syngenetic mineral content (framboidal pyrite) and epigenetic pyrite of 1.23 (vol.%).
Geological Engineering Department Universitas Gadjah Mada
2020-08-07
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/53208
10.22146/jag.53208
Journal of Applied Geology; Vol 4, No 2 (2019); 82 - 91
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/53208/26746
Copyright (c) 2020 Hendra Amijaya, Beny Wiranata, Ferian Anggara, Agung Rizki Perdana, Oyinta Fatma Isnadiyati, Deddy Nan Setya Putra Tanggara
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/53255
2020-01-08T08:47:46Z
jag:ART
The 22 February 2018 landslide mechanism in Pasir Panjang Village, Brebes Regency, Central Java, Indonesia
Wilopo, Wahyu
Ekasara, Adam Raka
Setiawan, Hendy
Karnawati, Dwikorita
Landslide - Shear strength parameters - SLIDE model - Back analysis
On 22 February 2018 landslide occurred in Pasir Panjang Village, Salem District, Brebes Regency of Central Java Province, Indonesia. About 8 people were died, 4 people were injured and several infrastructures were damaged due to this landslide. This research is carried out to understand geological-geotechnical condition and to study the initiation mechanism of the landslide. Field investigation and UAV mapping are carried out to detect slip surface and define slope geometry. The rainfall-induced pore-water pressure is estimated by using the Slope Infiltration Distributed Equilibrium (SLIDE) model. Then, limit equilibrium method is used to estimate the safety factor of the slope, while the shear strength parameters are determined by applying back analysis approach that compared with data from laboratory tests. The results show that landslide occurred in permeable layer of silty sand overlaid above impermeable andesitic breccia. Results from back analysis indicate that the shear strength parameters and rainfall intensity are strongly influence the stability of slope against landslide.
Geological Engineering Department Universitas Gadjah Mada
2020-08-07
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/53255
10.22146/jag.53255
Journal of Applied Geology; Vol 4, No 2 (2019); 92 - 100
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/53255/26763
Copyright (c) 2020 Wahyu Wilopo, Adam Raka Ekasara, Hendy Setiawan, Dwikorita Karnawati
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/54199
2021-07-05T02:58:46Z
jag:ART
Stratigraphy of Kendeng Zone in Miyono Village and Surrounding, Sekar District, Bojonegoro Regency, East Java, Indonesia
Muwaffiqih, Mutawif Ilmi
Nugraha, Wahyu Ardiansyah
Lubis, Irvan Fatarwin
Novian, Mochammad Indra
Stratigraphy, Kendeng Zone, Miyono, Bojonegoro Regency
This paper will comprehensively discuss the stratigraphy of the Kendeng Zone by using geological field mapping and laboratory analysis. The research area located in the Miyono Village and surrounding areas, Sekar District, Bojonegoro Regency, East Java with an area of 4x5 km2. Based on the geological mapping results obtained 160 points station with a variety of results in the form of tracking map of the research area. Laboratory analysis uses Embry and Klovan classification (1971), Pettijohn et al. (1987), and Mount (1985) for petrographic analysis, while paleontological analysis using Manual of Planktonic Foraminifera (Postuma, 1971) and Atlas of Benthic Foraminifera (Holbourn et al., 2013). This paper will show the differences between regional stratigraphy and the result, depositional environment, and its mechanism. Lithology units found grouping into nine units. The research area epoch ranged between N18-N23 (early Pliocene - Holocene) and the depositional environment from the lower bathyal to the terrestrial. The geological structures of the research area must be considered in the stratigraphic arrangement determination. Based on the analysis, the Kendeng Zone stratigraphic column was obtained and expected to provide accurate data of Kendeng Zone specifically around Miyono area.
Geological Engineering Department Universitas Gadjah Mada
2021-07-05
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/54199
10.22146/jag.54199
Journal of Applied Geology; Vol 6, No 1 (2021); 17-32
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/54199/31614
Copyright (c) 2021 Mutawif Ilmi Muwaffiqih, Wahyu Ardiansyah Nugraha, Irvan Fatarwin Lubis, Mochammad Indra Novian
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/54586
2021-01-18T14:11:57Z
jag:ART
Phytoremediation of Heavy Metals Contaminated Soil in Artisanal Gold Mining at Selogiri, Wonogiri District, Central Java, Indonesia
Madyo Pranoto, Bambang Suryo
Budianta, Wawan
phytoremediation; soil; metals; artisanal; mining
Artisanal gold mining (ASGM) is commonly found in Indonesia, particularly in Wonogiri District, Central Java. One of the impacts of ASGM activity is soil contamination influence by mining waste. The objective of this study to investigate the potential use of Amaranthus spinosus L. and Jatropha curcas for remediation of Pb and As in contaminated soil. Phytoremediation experiment was conducted by using Amaranthus spinosus L. and Jatropha curcas and evaluate the effectiveness of both plants as a hyperaccumulator. The result shows that the higher Pb and As concentration was found in roots rather than shoots in both plants, however, the use of Jatropha curcas seems more effective on reducing Pb and As concentrations more than Amaranthus spinosus L in both shoots and roots. Generally, the use of both hyperaccumulator plants was more effective in Pb remediation compared to As. This phytoremediation experiment revealed that the use of both hyperaccumulator plants reduces the concentrations of Pb and As in contaminated soil, which of the critical point leading to the entry of Pb and As into the food chain.
Geological Engineering Department Universitas Gadjah Mada
Wawan Budianta
Gadjah Mada University
Department of Geological Engineering
2021-01-18
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/54586
10.22146/jag.54586
Journal of Applied Geology; Vol 5, No 2 (2020); 64-72
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/54586/30348
Copyright (c) 2021 Bambang Suryo Madyo Pranoto, Wawan Budianta
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/55009
2020-08-11T06:47:21Z
jag:ART
Coastal groundwater aquifer characterization from geoelectrical measurements- A case study at Kalapara, Patuakhali, Bangladesh.
Khalil, Mohammad Ibrahim
Islam, S. M. Didar-Ul
Uddin, Md. Jamal
Majumder, Ratan Kumar
Aquifer, Coastal land, Geoelectrical sounding, Groundwater, Vertical electrical sounding (VES).
Vertical electrical sounding has been carried out in a coastal area in the southern part of Bangladesh to locate the groundwater aquifers containing fresh water. The Interpex1X1Dv3 computer program was used to process the field apparent resistivity data sets obtained from the vertical electrical sounding. Geoelectric layers were identified in the context of resistivity and thickness from the vertical electrical sounding data. From the initial parameters layered model was achieved using the inversion technique. Correlation of the obtained layer model with a nearby lithologic log concludes the groundwater aquifer system of the area. From the electrical properties of the subsurface layers, water bearing layers were detected and characterized. Very fine sand geoelectric layer with a thickness varying from 20 to 143 meters is an upper aquifer and has 0.66–14.02 Ωm apparent resistivity value. Fine sand geoelectric layer with 0.21-5.99 Ωm apparent resistivity value is lower aquifer with maximum thickness ~250 meters. From the resistivity value, it is observed that the upper aquifer contains saline to brackish-fresh water while the resistivity value of the lower aquifer indicates that it contains saline water. The water quality of the upper zone varies geographically from the southern to the northern part in the investigated area. The water quality of the upper aquifer is fresh in the northern part of the study while lower aquifer contains saline water there.
Geological Engineering Department Universitas Gadjah Mada
Ministry of Science and Technology, Government of the People's Republic of Bangladesh
2020-08-11
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/55009
10.22146/jag.55009
Journal of Applied Geology; Vol 5, No 1 (2020); 1-12
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/55009/28326
Copyright (c) 2020 Mohammad Ibrahim Khalil, S. M. Didar-Ul Islam, Md. Jamal Uddin, Ratan Kumar Majumder
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/55091
2021-07-05T02:58:46Z
jag:ART
Engineering Site Investigation for Foundation Design and Construction in Shale and Sandstone Derived Soils of Okitipupa Area, Southwestern Nigeria
Olumuyiwa, Falowo Olusola
Driven pile; strip footing; square footing; geotechnical; Okitipupa
Geotechnical and geo-electrical investigations of Okitipupa has been carried out with the major objectives of establishing the subsoil/geology, evaluate the geotechnical properties and recommend appropriate foundation alternatives for building foundation construction. Seven borings were carried out with hand auger at two cone penetration test locations, and representative samples were collected and analyzed in the laboratory in accordance with relevant geotechnical engineering standards. In addition, six vertical electrical soundings (VES) were also conducted using Schlumberger configuration. The result of VES delineates three major geologic sequence comprising the topsoil/caprock, sand surficial aquifer, and sand intermediate aquifer. The topsoil has resistivity range of 242 – 1503 ohm-m and thickness of 3.4 - 20.9 m composed of clay sand and sand. This layer is capable of supporting shallow foundation such as simple spread, raft of reinforced concrete, with recommended allowable bearing pressure of 100 KN/m2 at depths of 1.0 m and 3.2 m in the northern and southern part of the study area respectively. The estimated settlement are less than 50 mm using foundation width of 0.6 m, but could be reduced by almost 50% if the width is greater than or equal to 2 m. The groundwater level is very deep (>10 m) and may not likely threatens the integrity of the foundation structures. The estimated allowable bearing capacity for strip footing (203 – 980 KN/m2), square footing (608 – 2940 KN/m2) within 1.4 m depth is appropriate. The capacity of driven (deep foundation) circular piles of diameters 400mm, 500mm, and 600mm, the recommended pile capacity varies at depth of 5 m (69 – 124 KN), 10 m (225 – 378 KN), and 15 m (470 – 766 KN), while that of bored circular pile ranges from (36 – 75 KN), 10 m (93 – 180 KN), and 15 m (170 – 317 KN).
Geological Engineering Department Universitas Gadjah Mada
2021-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/55091
10.22146/jag.55091
Journal of Applied Geology; Vol 6, No 1 (2021); 62-76
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/55091/31672
Copyright (c) 2021 Falowo Olusola Olumuyiwa
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/55235
2021-01-18T14:11:57Z
jag:ART
Hydrothermal Alteration of High Sulfidation Epithermal Deposits in Secang Area, Tulungagung, East Java, Indonesia
Titisari, Anastasia Dewi
Pratomo, Septyo Uji
Idrus, Arifudin
Tulungagung; epithermal, high-sulfidation, alteration, vuggy quartz
This research aims to determine geological condition and alteration in an epithermal high sulfidation mineralization as an initial guide for further exploration stages. Detailed geological mapping with scale of 1:12,500 is conducted to identify geological aspects and distribution of alteration zones. Selected rocks samples were prepared for laboratory analysis which are petrography, XRD (X-Ray Diffraction), and FA-AAS (Fire Assay-Atomic Absorption Spectrometry) analyse. Geological condition of the study area consists of six rock units including andesite lava, andesite breccia, diorite intrusion, polymict breccia, limestone, and alluvial deposit. Geological structures found are left strike-slip fault with right strike-slip fault as accompany. Result of XRD analysis shows the presence of clay minerals group: smectite, kaolinite, illite, diaspore, alunite, and pyrophillite. The alteration zones of study area are propylitic, argillic, advance argillic, and silisification zones. The further exploration stage is recommended to focus at the southwest and northeast of study area.
Geological Engineering Department Universitas Gadjah Mada
Geological Engineering Department, Universitas Gadjah Mada
2021-01-18
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/55235
10.22146/jag.55235
Journal of Applied Geology; Vol 5, No 2 (2020); 73-83
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/55235/30347
Copyright (c) 2021 Anastasia Dewi Titisari, Septyo Uji Pratomo, Arifudin Idrus
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/55276
2022-07-28T03:52:29Z
jag:ART
Opak Fault Strand Delineation Using Merapi Slope Shifted Indicator
Sutiono, Agus
Prastistho, Bambang
C. Prasetyadi, C. Prasetyadi
Supartoyo, Supartoyo
Key word: Opak Fault, Morphotectonic, Slope Shifted, Delineation.
Abstract After the Yogya earthquake occurred on May 27, 2006, the opinions of experts split into two groups regarding location of responsible fault to earthquake shacking; (1), First group argues that Opak Fault displacement caused the earthquake. Where fault line is commonly known runs along Opak River, striking from Parangtritis Beach to Prambanan. (2) Second group of experts stated at deferent opinion, that another fault displacement triggered the earthquake shock. Where is located at the East side of the Opak River about 10 Km. On the other-hand, this paper proposes an idea to unravel Opak Fault position by understanding, that main active fault movement underlying Bantul region has been influencing continuum mechanical process, onto Merapi Sediments surface since the early periods of continuing Merapi materials sedimentation. It should has been reflected to the surface landform at above the fault strand. Further, indicates to morphotectonic feature as an en echelon slope shifted alignment. Thus, it can be the way to assist in defining attribute of main fault (PDZ) areas by using its en echelon indicator of shifting slope alignment. This paper also presents the results of determining Opak fault line location by using Digital Elevation Model (DEM-NAS) to generate custom shading in approaching landform features. With a further doing specific landscapes observations over the entire of Young Merapi deposits. There are other challenges to alternate identification of buried basin faults fill, by doing carefully identifications in morphotectonic aspects over the entire South Slope Merapi flank. It traces from Kepurun village at about elevation 400 m towards Parangtritis at 25 m of elevation. Independent field morphotectonic data sets of such scarp, terraces, water springs alignment and active cracks are encountered in the vicinity of Merapi sediments slope shifted, particularly in Tirtomartani Jetis village Kalasan. Identification of such structures obtained from morphotectonic analysis results are regarded as reliable indicator of faults, which is efficiently can be found in field.Key word: Opak Fault, Morphotectonic, Slope Shifted, Delineation.
Geological Engineering Department Universitas Gadjah Mada
(BPPTKG) Institute for Investigation and Technology Development of Geological Disaster and (PVMBG) Center of Volcanology and Geological Disaster Mitigation
2022-06-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/55276
10.22146/jag.55276
Journal of Applied Geology; Vol 7, No 1 (2022); 35 - 40
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/55276/34292
Copyright (c) 2022 Agus Sutiono, Bambang Prastistho, C. Prasetyadi C. Prasetyadi, Supartoyo Supartoyo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/55472
2020-08-11T06:47:21Z
jag:ART
Low-Sulfidation Epithermal Carbonate-Base metal-Gold Mineralization Hosted by Tertiary Sedimentary Rocks in Bastem Prospect, Luwu District, Sulawesi Island, Indonesia: A Preliminary Study
Idrus, Arifudin
Nur, Irzal
Sufriadin, Sufriadin
Fadlin, Fadlin
Sanjaya, Indra
Langkoke, Rohaya
Sedimentary rocks, LS epithermal gold, Bastem, Sulawesi Island, Indonesia
In Indonesia, gold is typically mined out from epithermal, porphyry and skarn deposit types occurred within volcanic belts along magmatic arc or active continental margin setting. Numerous gold prospects, however, are recently discovered in association with metamorphic and sedimentary rocks. This paper is aimed to discuss a preliminary study on the occurrences and characteristics of the sedimentary rock-hosted low-sulfidation (LS) epithermal gold mineralization in Bastem (Bessengan Tempe) prospect, Luwu district, Sulawesi Island, Indonesia. Detailed geological and hydrothermal alteration mapping was performed to understand the distribution and characteristics of ore mineralization. Representative ore samples taken were analysed for ore chemistry by means of Fire Assay – Atomic Absorption Spectrometry (FA-AAS) and Acid Geochemical Digest - Atomic Absorption Spectrometry (GA-AAS). The results from this work that the Bastem prospect is stratigrapically occupied by Tertiary sedimentary rocks of Toraja formation, which is adjacent to volcanic rocks of Lamasi formation. Gold-bearing quartz±carbonate veins are hosted by mudstone and siltstone of Toraja formation. The quartz-carbonate veins show a typical LS epithermal open space filling texture containing erratic gold grade of up to 7.16 g/t with relatively high besemetals (Pb and Zn) grades of up to >0.4 and >1%, respectively. Based on those various features, the LS epithermal deposit is categorized as “carbonate-basemetal-gold mineralization type”, which might be originated in back arc rift/basin setting. This ‘unconventional’ sedimentary rock hosted-gold mineralization type would be the new target of gold exploration in Indonesia.
Geological Engineering Department Universitas Gadjah Mada
2020-08-11
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/55472
10.22146/jag.55472
Journal of Applied Geology; Vol 5, No 1 (2020); 53-63
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/55472/28369
Copyright (c) 2020 Arifudin Idrus, Irzal Nur, Sufriadin Sufriadin, Fadlin Fadlin, Indra Sanjaya, Rohaya Langkoke
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/56134
2021-01-18T14:11:57Z
jag:ART
Updated Segmentation Model of the Aceh Segment of the Great Sumatran Fault System in Northern Sumatra, Indonesia
Hady, Aulia Kurnia
Marliyani, Gayatri Indah
Fault segmentation , Great Sumatran Fault , Earthquake hazards , Tectonic geomorphology , Aceh Fault.
We study the Aceh Fault segment, the northernmost segment of the Great Sumatran Fault in western Indonesia. The Aceh Fault segment spans 250 km long, passing through three districts: West Aceh, Pidie Jaya, and Aceh Besar, a region of ~546,143 population. The current segmentation model assumes that the Aceh Fault segment acts as a single fault segment, which would generate closer to an M8 earthquake. This estimation is inconsistent with the ~M6–7 historical earthquake data. We conduct a detailed active fault mapping using an ~8 m resolution digital elevation model (DEM) of DEMNAS and sub-m DEM data from UAV-based photogrammetry to resolve this fault’s segmentation model. Our study indicates that the Aceh Fault is active and that the fault segment can be further divided into seven sub-segments: Beutong, Kuala Tripa, Geumpang, Mane, Jantho, Indrapuri, and Pulo Aceh. The fault kinematics identified in the field is consistent with right-lateral faulting. Our study’s findings provide new information to understand the fault geometry and estimate potential earthquakes’ maximum magnitude along the Aceh Fault segment. These are important for the development of seismic hazard analysis of the area.
Geological Engineering Department Universitas Gadjah Mada
Geological Engineering Department, Universitas Gadjah Mada
2021-01-18
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/56134
10.22146/jag.56134
Journal of Applied Geology; Vol 5, No 2 (2020); 84-100
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/56134/30350
Copyright (c) 2021 Aulia Kurnia Hady, Gayatri Indah Marliyani
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/56345
2020-08-11T06:47:21Z
jag:ART
Mineralogical, Geochemical, and Mechanical Characteristics of Intrusive Andesite Rock Slope in Sangon 2 Area, Kulon Progo Regency, Indonesia
Phyu, Hnin Thandar
Hendrayana, Heru
Indrawan, I Gde Budi
Kamai, Toshitaka
Applied Geology, Mineralogical
This study was carried out to investigate mineralogical, geochemical, and mechanical characteristics of intrusive igneous rock andesite consisting of Sangon 2 Slope located in Kulon Progo Mountains. Mineralogical characteristics of the rocks consisting of the slope were identified by visual observation of hand specimens in the field and petrographic and X-ray Diffraction (XRD) analyses of the rock samples in the laboratory, which rock genetic classification was determined. Types of rock hydrothermal alterations were determined by the presence of key minerals identified in the petrographic and XRD analyses. Hydrothermal alteration intensity was determined by comparing the number of secondary minerals to the primary minerals observed in the petrographic analyses of thin sections by point counting method. Rock weathering degrees were determined in the field based on the visual characteristics and in the laboratory-based on the Chemical Index of Alteration (CIA) of the rock samples. The rock uniaxial compressive strength (UCS) was determined by point load and compression tests. The results showed that the rocks typically consisted of 6.37 to 74.3% plagioclase, 1.52 to 6.82% quartz, 7.81 to 17.2% hornblende, and 4.81% pyroxene minerals and, therefore, were classified as andesite. The presence of chlorite and calcite as secondary minerals in the andesite rock samples indicated that the parent andesite rocks had undergone prophylactic hydrothermal alteration. Meanwhile, the percentages of primary minerals to secondary minerals indicated that the andesite rocks had undergone weak to high alteration intensity. Based on the visual characteristics, the research area consisted of fresh, slightly, moderately, highly, and completely weathered andesite rocks, and residual soil. The CIA values of the rock samples increased with the increase in rock weathering degree. Rock weathering degrees identified by the visual characteristics appeared to be in good agreement with those classified based on the CIA. The lower part of the mine slope profile consisted of fresh and slightly and moderately weathered andesite rocks, which had relatively high strength and were classified as very strong rocks. Meanwhile, the upper part of the slope profile consisted of highly and completely weathered andesite rocks, which had low compressive strength.Keywords: andesite, hydrothermal alteration, kulon progo, prophylactic alteration, weathering
Geological Engineering Department Universitas Gadjah Mada
2020-08-11
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/56345
10.22146/jag.56345
Journal of Applied Geology; Vol 5, No 1 (2020); 25-39
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/56345/28328
Copyright (c) 2020 Hnin Thandar Phyu, Heru Hendrayana, I Gde Budi Indrawan, Toshitaka Kamai
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/56916
2021-01-18T14:11:57Z
jag:ART
Simulation of Kalirejo Road Side Slope based on Altered Andesite Characters, Kulon Progo Regency, Indonesia
Thandar Phyu, Hnin
Hendrayana, Heru
Indrawan, I Gde Budi
Kamai, Toshitaka
ABSTRACT. This study is performed to investigate the characteristics of intrusive andesite rock consisting of Kalirejo Road Side Slope located in Kulon Progo Mountains. The rocks consisting the slope are identified by visual observation of hand specimens in the field, petrographic and X-ray Diffraction (XRD) analyses of the rock samples in the laboratory, upon which genetic rock classification is determined. The altered rock types are determined by the presence of specific minerals identified in the petrographic and XRD analyses. The alteration intensity is examined by comparing the amount of secondary minerals to the primary minerals observed in the petrographic and XRD analyses. The developments of rock weathering are determined in the field GSI classification based on the visual characteristics and in the laboratory-based on the Chemical Index of Alteration (CIA) and engineering properties of the altered rocks. The results show that the rocks typically consisted of 33.2 to 59.2% plagioclase, 1.4 to 5.1% quartz, therefore, are classified as andesite. The presence of halloysite, montmorillonite, and kaolinite as secondary minerals in the altered andesite indicated that the parent andesite rocks have undergone argillic alteration. Meanwhile, the percentages of primary minerals to secondary minerals indicate that the andesite rocks have undergone moderate to high alteration intensity. Based on the visual characteristics, the research area consisted of fresh, slight weathered andesite rocks and complete weathered residual soil. The CIA values of the samples are increased with the increase in rock weathering. Identification of visual characteristics of rock weathering appeared to be in good agreement with those classified based on the CIA and engineering properties analysis results. The uniaxial compressive strength (UCS) of rocks and soils is determined by point load tests. Engineering properties of the residual soils are performed by using ASTM standard procedures. In the lower part of the roadside, slope consists of fresh and slightly weathered andesite rocks, which have relatively high strength and are classified as medium strong rocks. Meanwhile, the upper part of the slope profile contained completely weathered residual soil, which had very low compressive strength, are classified as very weak soil.Keywords: andesite, argillic alteration, Geological Strength Index (GSI), hydrothermal alteration, roadside slope, weathering
Geological Engineering Department Universitas Gadjah Mada
AUNSEED-Net, JICA
2021-01-18
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/56916
10.22146/jag.56916
Journal of Applied Geology; Vol 5, No 2 (2020); 101-112
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/56916/30349
Copyright (c) 2021 Hnin Thandar Phyu, Heru Hendrayana, I Gde Budi Indrawan, Toshitaka Kamai
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/57044
2020-08-11T06:47:21Z
jag:ART
Numerical Evaluation of Tunnel Portal Slope Stability at Bagong Dam Site, East Java, Indonesia
Fatkhiandari, Irien Akinina
Indrawan, I Gde Budi
Karnawati, Dwikorita
Bagong Dam; finite element method; GSI; RS2; slope stability
Geometries of excavated tunnel portal slopes at Bagong Dam site was initially designed without taking into account earthquake load. The excavated slope designs also assumed the rocks consisting the slopes were homogenous. The purpose of this research was to evaluate stability of the excavated tunnel inlet and outlet slopes at the Bagong Dam site under static and earthquake loads using finite element method. Stability of the natural slopes was also analyzed for comparison. The numerical static and pseudostatic analyses of slope stability were carried out using RS2 software (Rocscience, Inc.). Input data used in the numerical analyses were obtained from engineering geological mapping, rock core analyses, and laboratory tests. Seismic coefficient applied in the pseudostatic slope stability analyses was determined following guideline described in Indonesian National Standard. The engineering geological mapping and evaluation of rock cores indicated that the inlet tunnel slope consisted of four types of materials, namely residual soil, poor quality of volcanic breccia, very poor quality of volcanic breccia, and good quality of volcanic breccia. The outlet portal slope consisted of six types of materials, namely residual soil, very poor quality of limestone, poor quality of limestone, very poor quality of volcanic breccia, poor quality breccia, and good quality breccia. Based on the secondary elastic wave velocity (Vs) values, the rock masses in the research area were classified as hard rock (SA). Seismic analyses based on the earthquake hazard source map with 10% probability of exceedance in 50 years provided by the National Earthquake Center (2017) indicated that the PGA and the corresponding amplification factor FPGA in the research area were 0.3 and 0.8, respectively. The calculated seismic coefficient for the pseudostatic slope stability analyses was 0.12. The numerical analysis results showed that, in general, earthquake load reduced critical Strength Reduction Factor (SRF) values of the slopes. However, the natural and excavated tunnel portal slopes were relatively stable under static and earthquake loads. The natural slope at the tunnel inlet with a 40° inclination had critical SRF value of 4.0, while that of at the tunnel outlet with a 51° inclination had critical SRF value of 2.6. Under static load, the excavated slopes at the tunnel inlet and outlet having a 45° inclination had critical SRF values of 2.4 and 5.0, respectively. Under earthquake load, the excavated slopes at the tunnel inlet and outlet had critical SRF values of 2.3 and 3.5, respectively.
Geological Engineering Department Universitas Gadjah Mada
2020-08-11
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/57044
10.22146/jag.57044
Journal of Applied Geology; Vol 5, No 1 (2020); 40-52
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/57044/28329
Copyright (c) 2020 Irien Akinina Fatkhiandari, I Gde Budi Indrawan, Dwikorita Karnawati
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/57293
2022-07-28T03:52:29Z
jag:ART
Engineering Geology of Diversion Tunnel Area at the Meninting Dam Construction, West Lombok, Province of West Nusa Tenggara, Indonesia
Wiyasri, Yunie
Titisari, Anastasia Dewi
Dita, Sia Pamela
Indrawan, I Gde Budi
Meninting; Engineering Geology; lithology; soil classification; rock mass quality; GSI; tunnel portal slope
The construction of Meninting Dam is undertaken to resolve the water needs in Meninting Watershed, West Lombok, Province of West Nusa Tenggara, Indonesia. Therefore, creating a diversion tunnel is imperative to avert the river flow as the dam project commences. Also, engineering geology work on the soil and rocks, including the classification of physical and mechanical properties were conducted in the intended tunnel site. These considerations were necessary because of the unavailability of rock identification data using the GSI (Geological Strength Index) method which used to design the portal slopes as a significant factor in tunnel safety. The results show the proposed area for diversion tunnel construction to be in the lithology of the polymict breccia and the lapilli tuff units, and the soil conditions were included in the SM category (silty sand). The level of surface rock weathering was divided into 3 units, including: highly weathered residual soil lapilli tuff, and highly, as well as moderately weathered polymict breccias. Meanwhile, 4 units were identified on the rock cores (subsurface) comprising highly weathered residual soil of lapilli tuff, and highly, moderately, and slightly weathered polymict breccias. Based on GSI (Geological Strength Index) of rock and surface data from the area of study, the rock quality was grouped as poor (GSI values: 21-40) to very poor (GSI values: 0-20). However, drilling data classified the mass quality subsurface rocks in fair (GSI values 41-55), poor (GSI values: 21-40), particularly in tunnels, and very poor (GSI values 0-20). Therefore, the rock mass quality is possibly used to design the slope of the tunnel portal as 45⁰-55⁰, in order to ensure safety.
Geological Engineering Department Universitas Gadjah Mada
Geological Engineering Department, Universitas Gadjah Mada
2022-06-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/57293
10.22146/jag.57293
Journal of Applied Geology; Vol 7, No 1 (2022); 11 - 24
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/57293/34290
Copyright (c) 2022 Yunie Wiyasri, Anastasia Dewi Titisari, Sia Pamela Dita, I Gde Budi Indrawan
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/57552
2021-07-05T02:58:46Z
jag:ART
Dominant Weathering Profile Assessment of Kebo-Butak Volcanic Rocks in Gedangsari and Ngawen area, Yogyakarta, Indonesia
Mahendra, Fathan Hanifi Mada
Indrawan, I Gde Budi
surjono, sugeng sapto
Dominant Weathering Profile, Kebo-Butak Formation, intensive joints, fine-grained sedimentary rocks
The Gedangsari and Ngawen area is predominantly composed of volcanic and volcaniclastic sequencesdistributed east – west direction of the northern parts of Southern Mountain. The massive tectonism as well as tropical climatein this region have been producing weathering profiles in varying thickness which inevitably affects thegeotechnical properties. This study aims to assess the dominant weathering profileof the lower part of Kebo-Butak Formation as well as evaluating the distribution of the discontinuity. In order to know the dominant weathering profile and discontinuity evaluation, this study utilizes a total of 26 panels from five stations investigated through a geotechnical data acquisition including the geological condition, weathering zones, joint distribution, and discontinuity characteristics. The result shows four types of dominant weathering profiles in lower part of Kebo-Butak Formation called as dominant weathering profile A, B, C, and D. Profile A, B, C consisted of a relatively identical weathering degree pattern of fresh, slightly, moderately, completely weathered zone with the variation of thicknesses. However, the weathering degree in profile D reached the residual soil degree controlled by more intensive joints. The fine-grained sedimentary rocks also tends to have smaller spacing, shorter persistence, and higher weathering degree of discontinuities as compared to coarse-grained sedimentary rocks.
Geological Engineering Department Universitas Gadjah Mada
n/a
2021-07-05
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/57552
10.22146/jag.57552
Journal of Applied Geology; Vol 6, No 1 (2021); 33-41
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/57552/31680
Copyright (c) 2021 Fathan Hanifi Mada Mahendra, I Gde Budi Indrawan, sugeng sapto surjono
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/57578
2023-08-21T01:03:45Z
jag:ART
Stability Analysis of Saka DAM Diversion Tunnel Portal
Fajrin, Febrie Maulana
Pramumijoyo, Subagyo
Indrawan, I Gde Budi
Saka, GSI, Slope stability
The Saka Dam has a channel in the form of a diversion tunnel. This paper presents the results of rock mass characterization using the Geological Strength Index (GSI) classification and evaluation of the stability of the tunnel portal slope with earthquake loads using numerical methods. Based on the GSI classification, the Saka Dam tunnel portal slope is composed of rock masses that are poor quality, fair, and good. The calculation results show the Saka Dam can experience earthquake loads with an acceleration value of 0.4g. Earthquake loads can cause a decrease in the safety value (SRF) of the tunnel portal slope based on the results of numerical analysis. SRF value of natural portal slope without earthquake effect is 10.23 (inlet) and 1.5 (outlet). SRF value of the design slope portal without earthquake effect is 6.64 (inlet) and 1.76 (outlet), whereas if the earthquake effect is taken into account the SRF value obtained is 20.31 (inlet) and 0.99 (outlet). This shows that the condition of the natural portal slope and the portal slope design planner section of the Saka Dam inlet diversion tunnel is in the safe category. Meanwhile, for the portal slope excavated from the outlet section, modification is needed to obtain a safe slope condition. The results of the modified geometry of the slopes at the outlet section resulted in an SRF value of 1.47 which indicates the slope is stable
Geological Engineering Department Universitas Gadjah Mada
Gadjah Mada University
2023-08-20
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/57578
10.22146/jag.57578
Journal of Applied Geology; Vol 8, No 1 (2023); 23-33
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/57578/37070
Copyright (c) 2023 Febrie Maulana Fajrin, Subagyo Pramumijoyo, I Gde Budi Indrawan
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/57658
2022-01-13T01:31:30Z
jag:ART
Numerical Analysis of Slope Stability Due to Excavation of Diversion Tunnel at Pamukkulu Dam Site, Indonesia
Nugroho, Wakhid Khoiron
Indrawan, Dr., I Gde Budi
Setiawan, Nugroho Imam
diversion tunnel; finite element; GSI; slope stability; Pamukkulu Dam
Located in the Takalar Regency of South Sulawesi Province, the Pamukkulu Dam is planned to use a tunnel type as its diversion structure. One of the critical parts in the tunnel construction is the stability of portal slopes. This research aimed to estimate the effect of tunnel excavation on the stability of the portal inlet and outlet slopes under static and earthquake loads by using the finite element method. The slope stability analyses were carried out under conditions of prior to and after tunnel excavation. The input parameters used were laboratory test results in the forms of index properties and mechanical properties taken from rock core drilling samples, completed with the rock mass quality parameters based on the Geological Strength Index (GSI) classification. The Mohr-Coulomb failure criterion was used to model strength of the soil, while the Generalized Hoek-Brown failure criterion was used to model strength of the rocks. The results of rock cores analysis using the GSI method showed that the inlet tunnel slope consisted of four types of materials, namely residual soil, fair quality of basalt lava, good quality of basalt lava, and very good quality of basalt lava. Meanwhile, the outlet portal slope consisted of three types of materials, namely residual soil, good quality basalt lava, and very good quality basalt lava. The calculated horizontal seismic coefficient for the pseudo-static slope stability analysis was 0.0375. The analysis results of slope stability in the Y1 inlet section had a critical Strength Reduction Factor (SRF) value of 2.35 in a condition prior to the tunnel excavation and a critical SRF value of 2.34 after the tunnel excavation. The Y2 outlet section had a critical SRF value of 13.27 in a condition before tunnel excavation and a critical SRF value of 5.55 after the tunnel excavation. The earthquake load addition at the Y1 inlet section showed a critical SRF value of 2.05, both before and after the tunnel excavation. The Y2 outlet section showed a critical SRF value of 11.49 before the tunnel excavation and a critical SRF value of 5.54 after the tunnel excavation. The numerical analysis results showed that earthquake load reduced critical SRF values of the slopes. At the Y1 inlet section, the tunnel excavation did not have a significant effect on slope stability. It was demonstrated by an extremely small decrease in a critical SRF value of 0.43% for a condition without an earthquake load and an unchanged critical SRF in a condition with an earthquake load. At the Y2 outlet section, the tunnel excavation had a more significant effect on the slope stability. It was exhibited by the decrease in the critical SRF value of 58.18% in a condition without an earthquake load and a decrease in the critical SRF value of 51.78% in a condition with an addition of an earthquake load. However, the analysis of slope stability for both sections showed that all design slopes were above the required allowable safety factor value.
Geological Engineering Department Universitas Gadjah Mada
2021-12-31
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/57658
10.22146/jag.57658
Journal of Applied Geology; Vol 6, No 2 (2021); 102-111
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/57658/32948
Copyright (c) 2021 Wakhid Khoiron Nugroho, I Gde Budi Indrawan, Dr., Nugroho Imam Setiawan
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/58034
2022-01-13T01:31:30Z
jag:ART
The Engineering Characteristics and Classifications of Rock Masses along Road Section from Prambanan to Patuk, Yogyakarta, Indonesia
Juhari, Aisyah Shahirah
Indrawan, Dr., I Gde Budi
Wilopo, Wahyu
Geological Strength Index (GSI); rock mass quality; Rock Mass Rating (RMR); Semilir Formation; slope stability
Several attraction places and agriculture area that essentials for tourism and villager to do their activities are located approximately 6 km along the road of Candi Ijo to Ngoro-Oro in between Prambanan and Patuk sub-districts, Yogyakarta, Indonesia. Many jointed rock masses along the road have the potential to fail. This paper describes the rock mass characteristic and quality determined using the Geological Strength Index (GSI) and Rock Mass Rating (RMR) classifications. The rock mass characteristic and quality were essentially the preliminary results of a study to evaluate stability of the rock slopes along the road of Candi Ijo to Ngoro-Oro. Field observation and laboratory tests were carried out to determine parameters of the GSI and RMR. The results show that the slopes in the study area consisted of tuffaceous sandstone, vitric tuff, lithic tuff, cemented tuffaceous sandstone, lapilli tuff, subarkose, laminated mudrock, and laminated tuffaceous sandstone. The intact rocks were classified as weak to very strong. The research area consisted of three rock mass qualities, namely fair rock mass quality having GSI between 30 and 45 and RMR between 41 and 60, good rock mass quality having GSI between 46 to 65 and RMR between 61 and 80, and very good rock mass quality having GSI > 65 and RMR between 81-100. The relationship between GSI and RMR obtained in this study was in good agreement with that proposed by Hoek et al. (1995).
Geological Engineering Department Universitas Gadjah Mada
2021-12-31
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/58034
10.22146/jag.58034
Journal of Applied Geology; Vol 6, No 2 (2021); 119-127
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/58034/32949
Copyright (c) 2021 Aisyah Shahirah Juhari, I Gde Budi Indrawan, Dr., Wahyu Wilopo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/58069
2022-07-28T03:52:29Z
jag:ART
Stability Evaluation of Diversion Tunnel Portal Slopes at Lau Simeme Dam Site, Indonesia, using Limit Equilibrium Method
Huda, Nurul
Indrawan, I Gde Budi
Wilopo, Wahyu
diversion tunnel; Lau Simeme Dam; slope stability; limit equilibrium method; GSI
Construction of the Lau Simeme Dam used a tunnel as a diversion channel. Slopes at the diversion tunnel portals were prone to failure due to the tunnel excavation and earthquake. Earthquake load was not considered in the designs of the inlet and outlet portal slopes. This research evaluated stability of the tunnel portal slopes under static and earthquake loads using limit equilibrium methods of the Bishop Simplified and Morgenstern-Price. Input material properties for the slope stability analyses were obtained from evaluations of soil and rock cores, including determination of lithology type and rock mass quality based on Geology Strength Index (GSI), and laboratory testing. Evaluations of soil and rock cores indicated that the inlet portal slope consisted of residual soil, good quality tuff breccia, and good quality sandstone. The outlet portal slope consisted of residual soil, poor quality sandstone, poor quality tuff breccia, fair quality sandstone, fair quality tuff breccia, and good quality tuff breccia. The earthquake load coefficient determined by the seismic analyses based on the peak ground acceleration map for 10% probability exceedance in 50 year was 0.125 g. The slope stability analyses showed that the designed inlet and outlet portal slopes were stable under static and earthquake loads. The Bishop Simplified and Morgenstern-Price resulted in relatively similar Fs values. The Fs values of the inlet and outlet portal slopes decreased with the earthquake load application. Although Fs values of the outlet slope under static and earthquake loads met the requirements specified by SNI 8460:2017, the rock mass conditions, particularly the poor rock masses of layers 2 and 3, required special attention. Application of slope reinforcement methods, such as shotcrete, is suggested to further increase the slope stability.
Geological Engineering Department Universitas Gadjah Mada
2022-06-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/58069
10.22146/jag.58069
Journal of Applied Geology; Vol 7, No 1 (2022); 41 - 50
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/58069/34293
Copyright (c) 2022 Nurul Huda, I Gde Budi Indrawan, Wahyu Wilopo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/58135
2021-01-18T14:11:57Z
jag:ART
Estimating of Maximum Groundwater Level to Trigger Landslide in Batu Hijau Open Pit Mine, West Nusa Tenggara, Indonesia
Abd Karim, Amirul Aiman
Wilopo, Wahyu
Budi Indrawan, I Gde
Adriansyah, Yan
Landslide, anisotropy model, groundwater level, safety factor, Batu Hijau
The safety of the employees is essential in the mining activity area. Thus, the sloping wall of the pit needs to evaluate from time to time to avoid any loss due to landslide. One of the essential parameters to lead to slope failure is groundwater. Therefore, this paper highlights the limitations of the groundwater for the existing slope mine by analyzing it for several groundwater levels until it reached a safety factor below 1.2. The analysis was done using a finite element method for slope stability and finite element analysis for groundwater seepage for groundwater modeling. The results show that the safety factor of the slope showing a linearly decreasing trend and safety factor reached below 1.2 when 70 m increment in groundwater level from the original groundwater level model.
Geological Engineering Department Universitas Gadjah Mada
2021-01-18
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/58135
10.22146/jag.58135
Journal of Applied Geology; Vol 5, No 2 (2020); 113-123
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/58135/30352
Copyright (c) 2021 Amirul Aiman Abd Karim, Wahyu Wilopo, I Gde Budi Indrawan, Yan Adriansyah
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/58161
2022-01-13T01:31:30Z
jag:ART
Evaluating the Implications of Lineaments on Petroleum Fields: South Sumatra, Indonesia
Ngoroyemoto, Tapiwa Frank Kwachara
Petroleum, Exploration, Lineaments, GIS, Remote Sensing
Declining oil prices has led to a reduction of petroleum exploration as oil production as no longer a lucrative area of investment as in the previous years. Current exploration activities are supported by field work which are intensive considering the resources required. There is need to develop low cost methods to delineate areas of potential hydrocarbon resources. This research uses Land Satellite (Landsat) 8 Operational Land Imager (OLI) for alteration extraction, Shutter Radar Topography Mission (SRTM) for lineament extraction, Geological maps to develop a low cost method of petroleum exploration. The results indicate high OH bearing alterations on the Gumai and Kasai formation, a seal rock. Extensional tectonics is responsible for the migration of petroleum from the subsurface. It is suggested that future exploration be concentrated on the Gumai and Kasai formation based on evidence of micro seepage.
Geological Engineering Department Universitas Gadjah Mada
Universitas Gadjah Mada
2021-12-31
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/58161
10.22146/jag.58161
Journal of Applied Geology; Vol 6, No 2 (2021); 77-85
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/58161/32946
Copyright (c) 2021 Tapiwa Frank Kwachara Ngoroyemoto
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/58366
2021-07-05T02:58:46Z
jag:ART
Comparison of Coal Reserve Estimation Methods, Case Study PT. Bukit Asam Area, South Sumatra, Indonesia
Wijayanto, Taufiq Muhammad
Wilopo, Wahyu
Indrawan, I Gde Budi
Sunarko, Sunarko
coal, reserve estimation, NNP, IDW, kriging
The calculation of coal reserves is influenced by the dimensions or size of the coal deposit. There are several types of coal reserve calculation methods, and the use of these methods is adjusted to existing geological conditions. Each method will produce a different amount of coal reserves, although the location is the same. Besides, the amount of coal mining that can be produced is primarily determined by the mine design, especially the optimal slope as a basis for mining pits in the coal extraction. This research aims to estimate coal reserves based on existing pit designs using a variety of methods. Data on coal thickness and topography are used as the basis for reserves estimation. Coal reserve estimation is conducted in several methods: nearest neighbor point (NNP), inverse distance weighted (IDW), and kriging using Surfer 13 software. The results of the reserves estimation indicate that kriging is the best method by providing the smallest error value with an RMSE value of 0.67 and coal reserves of 27,801,543 tons.
Geological Engineering Department Universitas Gadjah Mada
Department of Geological Engineering, UGM
2021-07-05
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/58366
10.22146/jag.58366
Journal of Applied Geology; Vol 6, No 1 (2021); 42-51
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/58366/31608
Copyright (c) 2021 Taufiq Muhammad Wijayanto, Wahyu Wilopo, I Gde Budi Indrawan, Sunarko Sunarko
http://creativecommons.org/licenses/by-sa/4.0
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