2024-03-29T05:21:18Z
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/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
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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
info:eu-repo/semantics/article
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
http://creativecommons.org/licenses/by-sa/4.0
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
http://creativecommons.org/licenses/by-sa/4.0
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
http://creativecommons.org/licenses/by-sa/4.0
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
http://creativecommons.org/licenses/by-sa/4.0
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
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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
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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
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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
oai:jurnal.ugm.ac.id:article/59185
2022-01-13T01:31:30Z
jag:ART
Landslide Susceptibility Mapping and Their Rainfall Thresholds Model in Tinalah Watershed, Kulon Progo District, Yogyakarta Special Region, Indonesia
Arrisaldi, Thema
Wilopo, Wahyu
Fathani, Teuku Faisal
Landslide often occurred in Tinalah watershed, Kulon Progo District, every year. The frequency of landslide events is increasing after high rainfall intensity. Some factors control landslides such as slope gradient, land use, geological structure, slope hydrology, and geological condition. This research has an objective to develop the susceptibility map of Tinalah watershed and to identify the rainfall threshold to trigger a landslide. The development of the susceptibility map using frequency ratio method with four parameters including slope, type of rock, land use, and lineament density. The landslide data were collected during the field survey and from regional disaster management authority (BPBD) Kulon Progo. Rainfall data were collected from BMKG and GSMap. Soil analysis also was conducted to develop a numerical model to verify the rainfall threshold value. The result shows a high susceptibility of the landslide area is dominated in Tinalah watershed. The rainfall threshold for the low susceptibility of the landslide zone is I=490.14 D-1.404with 5-7 days antecedent rain. The rainfall threshold for medium susceptibility map is I=164.32D-0,689 3-7 days antecedent rain. Moreover, the rainfall threshold for the high susceptibility of the landslide zone is 111.62 D-0.779, with 2-7 days antecedent rain.
Geological Engineering Department Universitas Gadjah Mada
landslide susceptibility map, rainfall threshold, Tinalah watershed
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/59185
10.22146/jag.59185
Journal of Applied Geology; Vol 6, No 2 (2021); 112-118
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/59185/32947
Copyright (c) 2021 Thema Arrisaldi, Wahyu Wilopo, Teuku Faisal Fathani
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/60699
2022-01-13T01:31:30Z
jag:ART
Comparison of Different Multispectral Images to Map Hydrothermal Alteration Zones in Kokap, Kulon Progo
Raharja, Bayu
Setianto, Agung
Titisari, Anastasia Dewi
Using remote sensing data for hydrothermal alteration mapping beside saving time and reducing cost leads to increased accuracy. In this study, the result of multispectral remote sensing tehcniques has been compare for manifesting hydrothermal alteration in Kokap, Kulon Progo. Three multispectral images, including ASTER, Landsat 8, and Sentinel-2, were compared in order to find the highest overall accuracy using principle component analysis (PCA) and directed component analysis (DPC). Several subsets band combinations were used as PCA and DPC input to targeting the key mineral of alteration. Multispectral classification with the maximum likelihood algorithm was performed to map the alteration types based on training and testing data and followed by accuracy evaluation. Two alteration zones were succeeded to be mapped: argillic zone and propylitic zone. Results of these image classification techniques were compared with known alteration zones from previous study. DPC combination of band ratio images of 5:2 and 6:7 of Landsat 8 imagery yielded a classification accuracy of 56.4%, which was 5.05% and 10.13% higher than those of the ASTER and Sentinel-2 imagery. The used of DEM together with multispectral images was increase the accuracy of hydrothermal alteration mapping in the study area.
Geological Engineering Department Universitas Gadjah Mada
Ministry of Energy and Mineral Reosurces
Gadjah Mada University
2021-12-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/60699
10.22146/jag.60699
Journal of Applied Geology; Vol 6, No 2 (2021); 86-101
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/60699/32945
Copyright (c) 2021 Bayu Raharja, Agung Setianto, Anastasia Dewi Titisari
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/60835
2023-08-21T01:03:45Z
jag:ART
Identification of Permeable Structures and Heat Source in the Geothermal Working Area of Galunggung Volcano and the Heat Source Connectivity to the Karaha-Cakrabuana Area Using Gravity Data
Prabowo, Leo Agung
Husein, Salahuddin
Sismanto, Sismanto
Galunggung, Gravity Method, Derivative Analysis, 3D Model
Galunggung volcano area is a geothermal concession area that adjacent with Karaha-Cakrabuana concession area with a distance around 1 km. Indonesian Government planning to build power plant in 2025 so additional research needed to support the plan. Gravity survey could help in identifying permeable structure (fault) as well as heat source to a certain depth. The results of data processing showed the presence of faults seen on the FHD, SVD, and ABL residual maps, while for heat sources it was shown from the closed contour patterns on the ABL, residual, and regional maps. Derivative analysis in strengthens the position and type of fault from the match between the maximum FHD value and zero SVD value. From these results, identified the existence of three faults in the study area and were all identified as normal faults. 3D modelling gave a picture of density contrast in research area. From the section profile that pass through Galunggung and Telaga Bodas crater, heat source was interpreted as density with value 2.8 – 3.0 gr/cm3 and marked by orange to red color that coincide below Galunggung crater and continoued to Talaga Bodas crater at depths below -3000 masl. This indicate that both concession area was connected.
Geological Engineering Department Universitas Gadjah Mada
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/60835
10.22146/jag.60835
Journal of Applied Geology; Vol 8, No 1 (2023); 34-47
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/60835/37068
Copyright (c) 2023 Leo Agung Prabowo, Salahuddin Husein, Sismanto Sismanto
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/60924
2021-07-05T02:58:46Z
jag:ART
Fluid Inclusion Study of Epithermal Gold-Base Metal Mineralization System in the Shwebontha Prospect, Monywa Mining District, Central Myanmar Monywa
Oo, Toe Naing
Harijoko, Agung
Setijadji, Lucas Donny
Shwebontha, Wuntho Popa Magmatic Arc, gold-base metal mineralization, fluid inclusion, paleo-depth
The Shwebontha Prospect area is one of prominent epithermal Au-Ag prospects in Monywa mining district, central Myanmar, characterized by the appearance of gold-bearing and base metal quartz veins with gold grade is around 3g/t -10.4g/t. The geology of the area consists of the volcanic and volcaniclastic rocks of Upper Oligocene-Middle Miocene Magyigon Formation that served as the host rock of the ore mineralization. This research focused on fluid inclusion study is aimed to know the characteristics of hydrothermal fluids during ore mineralization as well as the possible paleo- depth and temperature of formation of gold-bearing and base metal quartz veins. The mineralization styles are gold-bearing brecciated quartz veins and chalcedonic quartz veins where sulfides are clustered as well as disseminated both in quartz gangue and volcanic host rocks. Those quartz veins include pyrite, sphalerite, galena, chalcopyrite and gold (electrum). Fluid inclusion microthermometry indicates that the ore mineralization is characterized by the values of homogenization temperature range from 158°C to 310°C and salinities range from 0.35 to 2.41wt.% NaCl equiv. This temperature is consistent with the formation temperature of 250°C to 270 °C and also their estimate paleo-depth of formation is between 440m and 640m respectively. Microthermometric data indicates that fluid mixing and dilution were significant processes during ore mineralization and evolution of hydrothermal fluids. Based on the petrography of fluid inclusion, microthermometric measurements and ore minerals assemblage as well as estimation of paleo-depth from the Shwebontha Prospect imply that forming in under shallow level epithermal environment
Geological Engineering Department Universitas Gadjah Mada
AUN-SEED/Net (JICA) Program
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/60924
10.22146/jag.60924
Journal of Applied Geology; Vol 6, No 1 (2021); 1-16
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/60924/31609
Copyright (c) 2021 Toe Naing Oo, Agung Harijoko, Lucas Donny Setijadji
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/61183
2021-01-18T14:11:57Z
jag:ART
Petrography and Geochemistry of Metasedimentary Rocks from the Taku Schist in Kelantan, North-East Peninsular Malaysia.
Ahmad Aminuddin, Muhammad Irman Khalif bin
Imam Setiawan, Nugroho
Warmada, I Wayan
Ariffin, Kamar Shah
Yonezu, Kotaro
Peninsular Malaysia; Taku Schist; South-East Asia Indonesian orogen
The Taku Schist, which is located in the north-east Peninsular Malaysia, is characterized by its North-South oriented elongated body. It forms part of the Indonesian orogenic build-up that was generated via the convergence of the Sibumasu continental unit and Sukhothai Arc. Subsequent petrography analyses of the metasedimentary rocks sourced from the Taku Schist revealed that their formation was attributable to the metamorphism of greenschist into amphibolite facies, which could be observed near the Triassic and Cretaceous intrusions of the Kemahang Granite. The evolutionary process of the rocks could be linked with the interactions occurring between contact and regional metamorphisms. The resulting chemical classification upon their assessment disclosed that the metasedimentary rocks of Taku Schist were made up of greywacke and shale, grouped into the quartzose sedimentary provenance, and belonged to the Continental Island Arc (CIA). This information is required for the tectonic setting discrimination purpose. It is a reflection of the episodic contractions underwent by the Taku Schist, wherein they would lead to the Sibumasu sedimentary cover along with both an accretionary wedge and the genetically-correlated Bentong-Raub melange to different greenschist. Otherwise associated with amphibolite facies, the conditions and depths of the facies were determined according to their position in relation to the upper plate of the Sukhothai Arc.
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/61183
10.22146/jag.61183
Journal of Applied Geology; Vol 5, No 2 (2020); 124-140
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/61183/30351
Copyright (c) 2021 Muhammad Irman Khalif bin Ahmad Aminuddin, Nugroho Imam Setiawan, I Wayan Warmada, Kamar Shah Ariffin, Kotaro Yonezu
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/63302
2021-07-05T02:58:46Z
jag:ART
Subsurface Geology and Hydrothermal Alteration of The “X” Geothermal Field, West Java: A Progress Report
Utama, Peter Pratistha
Utami, Pri
Marliyani, Gayatri Indah
Atmaja, Randy Wijaya
Geology, subsurface, hydrothermal alteration, "X" geothermal field
“X” geothermal field is one of the geothermal fields in West Java. PT. Y (Persero) developed it since 2014. The geothermal field has produced electricity, with installed capacity amounted to 55 MWe. The “X” geothermal system is vapor-dominated. The geothermal manifestations are located at approximately 2,100 m asl. The “X” field consists of three main upflow zones: Kawah Putih, Kawah Ciwidey, and Kawah Cibuni. This study analyzed the drill cuttings from 3 wells as the primary data with total depths ranging from 1,581 to 2,166 m with the well’s highest stable temperatures measured of ±230°C. The three wells selected for this research—Well A, Well B, and Well C—were analyzed to describe the rock properties and estimate the prospect areas of present-day geothermal exploration in the “X” geothermal field.The paper aims to understand better of the subsurface geology and its correlation to the dynamic processes (i.e., hydrothermal alteration) in the “X” geothermal field. The hydrothermal minerals are formed by near-neutral pH fluids and are characterized by quartz, calcite, clays (smectite, illite, chlorite), wairakite, epidote, and actinolite. Acidic fluids are evident by forming acidic hydrothermal mineral, e.g., anhydrite at various depths of the studied wells, particularly at Well C which is located around Sugihmukti-Urug area. Moreover, the previous studies by Reyes (1990), Layman and Soemarinda (2003), Rachmawati et al. (2016), Elfina (2017) on hydrothermal minerals, geothermal manifestation characteristics, fluid geochemistry, and conceptual model are adapted to improve the analysis and interpretation of this paper.
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/63302
10.22146/jag.63302
Journal of Applied Geology; Vol 6, No 1 (2021); 52-61
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/63302/31679
Copyright (c) 2021 Peter Pratistha Utama, Pri Utami, Gayatri Indah Marliyani, Randy Wijaya Atmaja
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/63556
2023-08-21T01:03:45Z
jag:ART
Determination of Overpressure Zone and Its Mechanism in Baong Formation of the "Y" Field in North Sumatera Basin
Hasbullah, Andrea
Amijaya, Hendra
Setyowiyoto, Jarot
Baong Formation; North Sumatra Basin; overpressure
The “Y” Field is one of the offshore areas in the North Sumatra Basin which is believed to have an important role in hydrocarbon exploration in the future. The North Sumatra Basin is known as an area that has high overpressure conditions and sometimes overpredicts in determining the amount of overpressure, especially in the Baong Formation. The purpose of this research is to determine the top and bottom overpressure zones, to know the vertical distribution of overpressure, and to find the main factors causing the overpressure in the Baong Formation.The data used in this study were 5 wells which have wireline log data, formation pressure data, leak of test, final well reports, mud logs, as well as 29 lines of 2D seismic data and 1 3D seismic data. The method used in this study was the Eaton method to determine pore pressure whereas the cross-plot wireline log method, the AI (acoustic impedance) inversion method and the stacking velocity were used to determine pore pressure.The study indicated that the overpressure zone is located in the Baong Formation at 1650 - 2108 m depth with a pore pressure of around 2891.70 - 3580 psi. The overpressure is caused by loading mechanism, namely disequilibrium compaction. This is influenced by the thickness of the formation above Baong Formation.
Geological Engineering Department Universitas Gadjah Mada
PT. Patra Nusa Data
2023-08-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/63556
10.22146/jag.63556
Journal of Applied Geology; Vol 8, No 1 (2023); 56-64
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/63556/37072
Copyright (c) 2023 Andrea Hasbullah, Hendra Amijaya, Jarot Setyowiyoto
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/65651
2022-01-13T01:31:30Z
jag:ART
Assessment of heavy metal contamination in soil around Piyungan Landfill, Yogyakarta, Indonesia
Muyassar, Mufid
Budianta, Wawan
assessment; soil; contamination; metals; landfill
One of the negative impacts of the landfill as solid waste disposal is soil contamination by heavy metals. This study assessed heavy metals impact, especially Pb, Cu, Zn, and Cd, in the soil in Piyungan landfill, Bantul, Yogyakarta, Indonesia. The assessment was conducted by analyzing 15 soil samples from 25 cm depth in the study area, which was divided into three-zone. The study results showed that generally, the highest content of metals was found in zone II, which is located near or directly situated in a landfill site. The pollution index (PI) calculated showed in order Cd>Cu>Pb>Zn. The result also indicates that Cd has the highest pollution index and even the highest risk compared to Pb, Cu, and Zn. The eco-risk index (RI) calculation showed that the value was 29 to 70 demonstrating a low class. The result also indicates that the accumulation of heavy metals investigated in this study was normal, and that the ecological risk was relatively low.
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/65651
10.22146/jag.65651
Journal of Applied Geology; Vol 6, No 2 (2021); 128-135
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/65651/32944
Copyright (c) 2021 Mufid Muyassar, Wawan Budianta
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/68007
2022-07-28T03:52:29Z
jag:ART
Assessment of Groundwater Vulnerability and Total Organic Carbon in the Shallow Groundwater of Wonosari City, Gunung Kidul, Yogyakarta, Indonesia
Chandalsouk, Soutsadachan
Putra, Doni Prakasa Eka
Wilopo, Wahyu
Groundwater vulnerability, GOD, TOC, Wonosari-Indonesia
Wonosari city is the capital of Gunung Kidul regency of Yogyakarta Special Province. The city is located in the karst plateau overlaying a succesion of limestone lithologies. The groundwater on this city is shallow and people used this groundwater as their daily water supply. This study aims to determine the intrinsic groundwater vulnerability and to identify the TOC level in groundwater also to investigate the relationship between groundwater vulnerability and TOC levels in the groundwater. Field observation was conducted on 40 groundwater occurrences (dug wells, bore wells and springs) to investigate the aquifer types, overlying lithology and depth to groundwater. At the same time, 16 groundwater samples were taken from the dug wells and analyse for the TOC content. Secondary data was also collected from previous researches especially the information of sub-surface lithology. Groundwater vulnerability was evaluate by using GOD method and correlation between groundwater vulnerability and TOC in groundwater was analyzed spatially and statistically by using map pverlaying, linear regression and Spearman’s rho test, respectively. The results showed that the groundwater vulnerability in the city is dominated by extreme and high vulnerability, covers about 84 % of study area. The TOC level in the groundwater ranges between 4.532 mg/L to 6.849 mg/L which showing a process of pollution loading may occur. Linear regression and Spearman’s rho value show that the TOC levels and groundwater vulnerability has a moderate positive correlation with r2 value of about 0.324 for linear regression. Despite the moderate correlation, the research prove that the groundwater vulnerability map reveals on this study is good enough to represent the ability of natural condition in protecting the groundwater quality.
Geological Engineering Department Universitas Gadjah Mada
KNB scholarship, Universitas Gadjah Mada, Department of Geological Engineering, Getin-Cicero Lab
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/68007
10.22146/jag.68007
Journal of Applied Geology; Vol 7, No 1 (2022); 1 - 10
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/68007/34289
Copyright (c) 2022 Soutsadachan Chandalsouk, Doni Prakasa Eka Putra, Wahyu Wilopo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/69701
2022-07-28T03:52:29Z
jag:ART
Numerical Analyses of Tunnel Outlet Slope at Leuwikeris Dam, West Java, Indonesia
Sunardi, Sunardi
Indrawan, I Gde Budi
Murti, Ardian Baroto
finite element; Leuwikeris Dam; seismic load; slope stability; tunnel outlet
The excavated slope of the diversion tunnel outlet at the Leuwikeris Dam was designed based on core test data and the Circular Failure Chart (CFC) method. Stability of the excavated slope under static and seismic loads has not been verified using a different method. The objective of this research was to evaluate performance of the excavated slope under static and seismic loads using the finite element method (FEM). Stability analyses of the natural slope were also carried out to assess the improved stability of the slope after excavation. Geological mapping, examinations of drill cores and borehole logs, and laboratory tests were conducted to characterise the soils and rocks comprising the tunnel outlet slope. The rock masses were characterised using the Geological Strength Index (GSI) for the input parameters of the Generalised Hoek-Brown criterion. The slope stability analyses under static and seismic loads were performed using the finite element-based computer package RS2. The results show that the diversion tunnel construction site consists of residual soil and very poor to fair quality andesite breccia rock and tuff breccia with thin claystone intercalation. The groundwater table was located approximately 40 m below the ground surface. In general, the seismic load reduced stability of the slopes. The critical strength reduction factor (SRF) values of the natural portal slope, which had 40º inclination, were 3.6 and 1.45 under static and seimic loads, respectively. Meanwhile, the SRF values of the excavated slope, which had seven benches and 55 to 74º inclinations, were 3.83 and 1.78 under static and seismic loads, respectively. The natural and excavated slopes were considered stable under static and seismic loads and met the stability criteria specified by the National Standardization Agency (2017). The slope design increased the slope FS values by 6% and 20% under static and seismic loads, respectively.
Geological Engineering Department Universitas Gadjah Mada
Citanduy Watershed Service Office, Directorate General of Water Resources, Ministry of Public Works and Public Housing
PT. Hutama Karya
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/69701
10.22146/jag.69701
Journal of Applied Geology; Vol 7, No 1 (2022); 25 - 34
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/69701/34291
Copyright (c) 2022 Sunardi Sunardi, I Gde Budi Indrawan, Ardian Baroto Murti
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/72067
2022-07-28T03:52:29Z
jag:ART
Landslide Susceptibility Mapping of Menoreh Mountain Using Logistic Regression
Sekarlangit, Nadia
Fathani, Teuku Faisal
Wilopo, Wahyu
Landslide conditioning factors; landslide prediction; landslide assessment; GIS
Menoreh mountain is one of the priority areas developed for tourism and to support sustainable development, it must pay attention to disaster aspects, one of which is landslides. The map published by Center for Volcanology and Geological Hazard Mitigation of Indonesia (PVMBG) has a regional scale, so it is necessary to have a more detailed landslide susceptibility map in the Menoreh Mountains. Identification and evaluation of the landslide conditioning factor were done using logistic regression so that the zonation of the probability of landslide susceptibility can be made. The data was used from field observation conducted at 372 locations including 129 locations where landslides occurred and from a local disaster management agency (BPBD) of 200 landslide locations. Significant landslide conditioning factors include slope, lithology, distance to lineaments, distance to river, and distance to road. The research area is divided into three susceptibility zones classified into low landslide susceptibility zone (0-0.33) covering 39.82%, moderate landslide susceptibility zone (0.34-0.66) covering 25.86%, and high landslide susceptibility zone (0.67-1.00) covering 34.31% of the whole area. Analysis using the logistic regression method has a model prediction accuracy rate of 90.5%, which means that it can predict landslide occurrence in the Menoreh Mountains accurately.
Geological Engineering Department Universitas Gadjah Mada
Department of Civil and Environmental Engineering, 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/72067
10.22146/jag.72067
Journal of Applied Geology; Vol 7, No 1 (2022); 51 - 63
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/72067/34302
Copyright (c) 2022 Nadia Sekarlangit, Teuku Faisal Fathani, Wahyu Wilopo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/72438
2023-08-21T01:03:45Z
jag:ART
Evaluation of Engineering Geological Conditions for Slope Stability Analysis of Diversion Tunnel Portal of Jlantah Dam, Karanganyar, Central Java
Ismanda, Yayi
Indrawan, I Gde Budi
Hendrayana, Heru
earthquake coefficient; GSI; rock mass quality; slope stability; slope safety factor value (SF)
This paper presents the research results carried out to analyze the slope stability of the diversion tunnel portal of Jlantah Dam based on the quality of the rock mass. The classification of the rock mass quality at the tunnel location refers to the Geological Strength Index (GSI) method while the analysis of portal slope stability is modelled numerically with the element method using Phase2 software. The modelling of the tunnel portal slope design with and without earthquake load was carried out to obtain the safety factor (SF) value. The results showed that the study area consists of residual soil, andesite breccia and lapilli tuff rocks with rock mass quality based on the GSI value ranging from poor to fair. The inlet portal slope is composed of rocks that have poor and fair mass quality while the inlet section is composed of rocks that have poor mass quality. The SF value>1.3 for conditions without earthquake effect was achieved on slope design 1V:1.5H and SF value>1.1 for conditions with earthquake effect was achieved on slope design 1V:2H. The SRF value at the portal outlet location is greater than the SRF value at the portal inlet location for the same slope design conditions indicating that the rock mass quality at the portal outlet location is better than the rock mass quality at the portal inlet location.
Geological Engineering Department Universitas Gadjah Mada
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/72438
10.22146/jag.72438
Journal of Applied Geology; Vol 8, No 1 (2023); 9-22
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/72438/37067
Copyright (c) 2023 Yayi Ismanda, I Gde Budi Indrawan, Heru Hendrayana
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/72588
2024-03-28T03:21:11Z
jag:ART
Preliminary Geochemical Appraisal on Sumatera, Java, and Kalimantan Coaly Source Rocks
Jyalita, Jasmin
Hendra A, Donatus
Anggara, Ferian
Western Indonesia; Coaly Source Rock; Geochemical Characteristics; TOC; Rock-eval Pyrolysis
In Western Indonesia’s petroleum system, one of the hydrocarbon source rocks was deposited in parallic-deltaic environment with high organic content, categorizing it as coaly source rock. This study focused on geochemical characteristics of 25 coal and coaly shale samples from rock outcrops and well representing the Central Sumatra, South Sumatra, South Central Java, Barito, and Kutai Basin, with additional data from previous studies. TOC analysis and Rock-eval Pyrolysis were carried out to reveal the geochemical characteristics and maturation pathway of the source rock. The TOC analysis results showed a value of 0.5-67.73 wt%, indicating poor-excellent source rock potential. Further rock-eval pirolysis exhibits kerogen type II/II-III (excluding samples from Ngimbang Fm.), with gas-dominated hydrocarbon. Hydrocarbon Index ranging from 4-308 mg/gC indicates possible low-moderate quantity of hydrocarbon that can be generated by the source rocks. Despite the overall fair-good source rock potential, Tmax of the samples indicates a very poor maturity level, with only Upper Talang Akar as the mature candidate. Thus, it can be concluded that young source rock candidates in Western Indonesia (limited to the basins studied in this research) initially possess potential in generating hydrocarbons, if it is not for the immature level of most coaly source rock formations.
Geological Engineering Department Universitas Gadjah Mada
Universitas Gadjah Mada (Program Rekognisi Tugas Akhir 2020)
Departemen Teknik Geologi FT UGM (Hibah Penelitian 2020)
2023-12-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/72588
10.22146/jag.72588
Journal of Applied Geology; Vol 8, No 2 (2023); 66 - 75
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/72588/38851
Copyright (c) 2024 Jasmin Jyalita
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/73457
2023-04-28T03:41:11Z
jag:ART
Facies Analysis and Reservoir Characterization Using Petrophysical Methods in the Interest Zone in the 'FAN' Field, Kutai Basin, East Kalimantan
Fajar Fathur Rahman, Isfan
Krisna Hidajat, Wahju
Setyawan, Reddy
Meilany, Yunita
Aditya Nugraha, Dhimas
Petrophysics, Facies, Kutai Basin, East Borneo
One of the most prospective oil and gas producing basins in Indonesia is Kutai Basin which is located in East Borneo. In Kutai Basin there is a natural resource potential in the form of gas which is quite abundant. This is due to the richness of the source rock aspect in the Kutai Basin which is dominated by coal. Besides coal, in the Kutai Basin there is also claystone with rich organic matter (organic shale) that has an important role as a prospective source rock. Therefore, a final project research was conducted in the Kutai Basin, East Kalimantan. The purpose of the research is to identifying the type and content of subsurface lithology and fluids, calculating petrophysical parameters, and making the facies distribution map at the research site in potential and prospective zone to produce hydrocarbons which is called the zones of interest. The research is focused on reservoir rocks at the research site because the hydrocarbons accumulated in the reservoir rocks itself. By focusing research on reservoir rocks, it will be able to describe the modelling and calculation results of petrophysical parameters using several analytical methods such as qualitative and quantitative analysis methods, electrofacies and parasequence analysis methods, stratigraphic correlation analysis methods, facies analysis methods and depositional environments, and facies map analysis methods. In addition, by focusing research on reservoir rocks, it can develop and increase the level of optimization of exploration and exploitation of drilling wells. Based on the analysis data, the research location is included in the transitional depositional environment, delta in particular with distributary channels and mouth bars facies and also it can be identified some lithology such as sandstone, claystone, coal, limestone, and organic claystone and there are fluids with gas and water types.
Geological Engineering Department Universitas Gadjah Mada
2023-04-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/73457
10.22146/jag.73457
Journal of Applied Geology; Vol 7, No 2 (2022); 101-110
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/73457/36233
Copyright (c) 2023 Isfan Fajar Fathur Rahman, Wahju Krisna Hidajat, Reddy Setyawan, Yunita Meilany, Dhimas Aditya Nugraha
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/73697
2023-04-28T03:41:11Z
jag:ART
Geochemistry of shield stage basalts from Baluran volcano, East Java, Sunda arc
Handini, Esti
Hasenaka, Toshiaki
Barber, Nicholas D
Shibata, Tomoyuki
Mori, Yasushi
Baluran; Sunda arc; primary arc basalt; petrogenesis of medium-K calc alkaline
We report petrography and geochemistry of basaltic lava flows from the shield stage of Baluran, a Quaternary volcanic center in the rear of East Java, Sunda Arc, Indonesia. These basalts contain abundant plagioclase, clinopyroxene, olivine, and minor magnetite. Geochemically, they resemble other medium-K calc alkaline basalts from eastern Java’s volcanoes, but they are less enriched in light ion lithophile elements (LILE) and Pb. The predicted primary basalt of Baluran lavas can be sourced to a more primitive primary melt composition which may also generate medium-K calc-alkaline magmas in the region. The fractionation trajectory of these primary magmas shows the importance of plagioclase, clinopyroxene, olivine, and magnetite phase removal from the melt. Regardless of the diverse composition of the derivatives, the calculated primary basalts from the eastern Java are all in the field of nepheline-normative. This finding suggests variably small degree of melting of clinopyroxene-rich mantle source is at play in the generation of these magmas. Our result further suggests that the clinopyroxene source rock is possibly present as veins in peridotite mantle which have experienced metasomatism by addition of slab-derived fluids at differing proportion.
Geological Engineering Department Universitas Gadjah Mada
2022-12-31
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/73697
10.22146/jag.73697
Journal of Applied Geology; Vol 7, No 2 (2022); 64-82
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/73697/35744
Copyright (c) 2022 Esti Handini, Toshiaki Hasenaka, Nicholas D Barber, Tomoyuki Shibata, Yasushi Mori
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/73942
2023-08-21T01:03:45Z
jag:ART
Cooling history (from magma ascent to lava extrusion) of the Watuadeg pillow lava, Berbah, Yogyakarta, Indonesia
Suhendro, Indranova
Harijoko, Agung
Setiawan, Nugroho Imam
Wibowo, Haryo Edi
Watuadeg, cooling rates, crystal size distribution, microlite number density, pillow lava
The Watuadeg pillow lava (WPL) is known as one of the most famous pillow lava outcrops in Yogyakarta, Indonesia, and its origin has been attributed to rapid-cooling process of subaqueous lava extrusion. However, there is no quantitative evidence that implies such hypotheses. Therefore, this study aims to reduce such a gap by revealing the cooling times (t) of WPL on the basis of a quantitative approach. In particular, we measured the size distribution (CSD) and number density (MND) of plagioclase microlites from the core, medial, and marginal (rim) domains of WPL. We found that the CSD slope significantly increases towards marginal zones, namely 30.4ᵒ for the core, 53.4ᵒ for the medial, and 228.1ᵒ for the rim. Because CSD slope is inversely proportional to cooling time ( ), by assuming a typical plagioclase microlite growth rate (G) of 1×107 mm/s, it is therefore inferred that the rim experienced the fastest cooling time (±12.1 hours), followed by the medial and core ((±52.0 and 91.4 hours, respectively). The fact that MNDs value increases toward the marginal zones also does not deny this idea (0.3×1016 m-3 for the core, 1.4×1016 m-3 for the medial, and 2.4×1016 m-3 for the rim), as higher MND with the domination of acicular-spherulitic habit represents a higher degree of undercooling. Because microlite is syn-eruptive product, our estimation represents the cooling time of magma since it migrated from the reservoir to the surface.
Geological Engineering Department Universitas Gadjah Mada
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/73942
10.22146/jag.73942
Journal of Applied Geology; Vol 8, No 1 (2023); 1-8
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/73942/37066
Copyright (c) 2023 Indranova Suhendro, Agung Harijoko, Nugroho Imam Setiawan, Haryo Edi Wibowo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/76532
2023-04-28T03:41:11Z
jag:ART
Engineering Geology and Slope Stability of West Pit Coal Mine of PT. Tawabu Mineral Resource, East Kalimantan, Indonesia
Saksono, Rama Tri
Indrawan, I Gde Budi
Wilopo, Wahyu
back stability analysis; coal mine; engineering geology; forward stability analysis; slope optimization
The research area was located in the west pit of the open pit coal mine of PT. Tawabu Mineral Resource (TMR) which is located in Bengalon District, East Kutai Regency, East Kalimantan Province, Indonesia. The research was driven by several landslides that occurred in the research area, but the engineering geological conditions and stability of the remaining slopes have not been evaluated. The objectives of this study were to better understand the engineering geological conditions and stability of the research area. The engineering geological conditions (i.e., geomorphology, rock and soil, geological structure, and groundwater conditions) were evaluated by photogrametric analyses, field observations, and analyses of borehole logs and laboratory test results. The slope stability analyses were firstly carried out by conducting back stability analyses of failed slope on the northern lowwall slope segment. The shear strength parameters obtained from the back analyses were then used for forward stability analyses of the remaining 10 lowwall and highwall slopes. The slope stability analyses involved deterministic and probabilistic analyses, under static and dynamic using the limit equilibrium method (LEM). The results showed that the research area and the surrounding consisted of two geomorphological units, namely the alluvial plain and structural hills. Rocks in the study area consisted of claystone, sandstone, and coal with a general layer strike direction of N59°E – N63°E with a dip of 19°-26°. These rocks were grouped into two lithological units, namely the alternating of claystone and sandstone unit and alternating of sandstone and claystone unit. The geological structures were identified on the highwall, from west to east namely major sinistral shear fault with a relative direction of NNE-SSW, two minor sinistral shear faults with a relative direction of NE-SW, and a major dextral shear fault with a relative direction of NW-SE. These geological structures were interpreted as being formed by the folding process. The groundwater level was estimated at a level of -45 m to 20 m. The slope stability analyses showed that only the East HW-4 slope, which was located on the east highwall, was unstable. It is recommended to optimize the slope by either lowering the groundwater elevation by 4 m from the actual level or by reducing the angle the overall slope to 31°.
Geological Engineering Department Universitas Gadjah Mada
2022-12-31
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/76532
10.22146/jag.76532
Journal of Applied Geology; Vol 7, No 2 (2022); 83-100
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/76532/35746
Copyright (c) 2022 Rama Tri Saksono, I Gde Budi Indrawan, Wahyu Wilopo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/78104
2023-08-21T01:03:45Z
jag:ART
Source Rock Quality and 1D Maturity Model in Pendalian Sub-basin, Central Sumatra Basin
Afifah, Putri Dwi
Amijaya, Hendra
Winardi, Sarju
Atmoko, Widi
1D Maturity Model; Source Rock.
Pematang Formation is well known as the main source rock in the Central Sumatra Basin (Mazied et al., 2008). The formation which acts as source rock has been studied thoroughly in the central and eastern parts of the basin, but research regarding source rock in the western part of the basin, which is the study area, is very limited. This paper aims to define the quality of source rock from a geochemical view through the determination of organic content quantity based on the Total Organic Carbon (TOC) data, determining the type of kerogen, and thermal maturity of the source rock according to the values of Tmax and Vitrinite Reflectance (%Ro). Burial history and thermal maturity models (1D basin modeling) were also constructed to understand the timing of hydrocarbon generation. The results show that Pematang Formation among Sihapas and Telisa Formation has good organic content with TOC ranging from 0.2 to 42.48 wt%, and the maturity parameters indicate that the Pematang Formation has reached the mature stage. Both formations are dominated by Type II kerogen. 1D modeling of the SHT-1 Well indicates that the Pematang Formation is currently in the oil maturity window starting from early oil to main oil at 20.61 Ma, but the model of the SMB-1 Well has not reached the oil maturity window. Tectonic activity is estimated to have a significant effect on this difference when the uplift activity of Bukit Barisan in the Middle Miocene increased the maturity in the northwest, but the inversion that occurred in the Late Miocene resulted in uplift and erosion of young sediments, thus lowering the temperature in some area.
Geological Engineering Department Universitas Gadjah Mada
PT Sigma Cipta Utama
Gadjah Mada University, Department of Geological Engineering
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/78104
10.22146/jag.78104
Journal of Applied Geology; Vol 8, No 1 (2023); 48-55
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/78104/37069
Copyright (c) 2023 Putri Dwi Afifah, Hendra Amijaya, Sarju Winardi, Widi Atmoko
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/78105
2024-03-28T03:21:11Z
jag:ART
Mineralogy and Ore Characteristics of the Kujang Pb-Zn Skarn Deposit, Sukabumi Regency, West Java
Suryawan, Eka Harris
Idrus, Arifudin
Suyanto, Imam
Ilmawan, Ilham
Faruqi, M.Dzulfikar
mineralogy and ore characteristics; skarn deposit; Sukabumi.
The Kujang Pb-Zn skarn deposit is known to be the newest skarn deposit found in the Sunda-Banda magmatic arc. The skarn orebodies are mostly hosted by limestone which might be the part of the Jampang Formation where dacite porphyry is interpreted to be the ore causative intrusion. Orebodies are mostly found at the contact between marbleized limestone and volcanic rocks and are controlled by NW-SE-trending strike-slip faults. Previous research on the mineralogy and ore characteristics of the Kujang Prospect remains limited on the preliminary studies. Using fieldwork data, petrography, ore microscopy, and assay data from core samples, this study is aimed to characterize the mineralogy of both alteration and ore of the deposit. The alteration of the Kujang Prospect skarn can be divided into 2 phases of alteration i.e. prograde and retrograde. The prograde alteration is characterized by the occurrence of clinopyroxene, wollastonite, and vesuvianite. Garnet is present in very rare amounts. the retrograde alteration is typified by epidote, chlorite, calcite and actinolite. Metalliferous minerals are represented by sphalerite, galena, pyrrhotite, chalcopyrite and pyrite. All ore minerals are formed at the early retrograde stage. the deposit’s average grade is 2.06% Pb, 6.45% Zn and 1.81% Cu.
Geological Engineering Department Universitas Gadjah Mada
Arifudin Idrus, Geological Engineering Department Universitas Gadjah Mada
Ilham Ilmawan & M. Dzulfikar, PT. Generasi Muda Bersatu
Laboratory of Minerals, Geological Engineering Department Universitas Gadjah Mada
2023-12-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/78105
10.22146/jag.78105
Journal of Applied Geology; Vol 8, No 2 (2023); 76 - 84
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/78105/38850
Copyright (c) 2024 Eka Harris Suryawan
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/78116
2024-03-28T03:21:11Z
jag:ART
Nickel as A Strategic Mineral and Its Potential Resources in X-Field, North Konawe, Southeast Sulawesi, Indonesia
Fatimah, Dian Yesy
Her Krissanto, Juvens Yuda
Pamunga, M. Nur Alif
Nugroho, Rio P.
Nickel;Strategic Mineral;Sulawesi;Electric Vehicle
Indonesia is the world's largest producer of Nickel laterite deposits. By the regulation of UU No. 3 2020, due to its utility as the main component of batteries on electric vehicles (EV), nickel is one of the metal minerals that play important role in energy transition issues. It will drive the increasing demand for Nickel and Indonesia needs a massive exploration and specific regulation, especially for this deposit. The focus of this research is to discuss how important Ni is as a strategic mineral and its potential resources in North Konawe, Southeast Sulawesi. The methods are based on field data analysis and references study.X-Field is located in Lasolo Island, North Konawe, Southeast Sulawesi. This area has potential resources of Ni-laterite deposit. The lithological condition consists of a massive ultramafic igneous rock complex. The host rock has already been enriched by the serpentinization process. The geochemical analysis shows various ranges of 0.87-2.43% Ni content from different soil zone. To this day, the government regulation of Ni in a specific way as a critical mineral is still not present. The lack of data transparency (supply chain) and policy synchronization urgently need to be solved.
Geological Engineering Department Universitas Gadjah Mada
Universitas Pertamina, Department of Geological Engineering
2023-12-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/78116
10.22146/jag.78116
Journal of Applied Geology; Vol 8, No 2 (2023); 85 - 90
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/78116/38849
Copyright (c) 2024 Dian Yesy Fatimah
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/78754
2023-04-28T03:41:11Z
jag:ART
Susceptibility Zoning of Soil Movement in Tawangmangu District, Karanganyar Regency with Bivariate Statistic Method - Weight of Evidence
Wirawan, Dwika Rizki
Setianto, Agung
Handini, Esti
Bivariate Statistics - Weight of Evidence, Soil Movement Susceptibility Zoning
Tawangmangu district which is located in Karanganyar Regency, Central Java is a crowded area which is susceptible to disaster. Therefore, susceptibility zoning analysis is needed to support the planning and development of the area. The method used is bivariate statistics - weight of evidence which has never been implemented in its location. There are two types of data, data of potential and soil movement case (divided into train data as 61 points and test data as 40 points); and parameter data of soil movement causes. Parameter data of soil movement is processed to be a WoE (Weight of Evidence) parameter map through the use of train data to know the weight. Later on, it will be validated based on the AUC value. If it’s > 0,60, then the process will proceed. Parameter which has AUC value > 0,60 is type of lithology, slope, hill, elevation, slope direction, distance from the fault, and index of vegetation density. All of those parameters are attached and being final validated by test data. Further, the zonation consists of four; zone of very low soil movement susceptibility, low, medium, and high. The area of the very low soil movement susceptibility zone is 19,68%. Zone of low susceptibility is mostly 24,57%. Zone of medium susceptibility is 25,88%. Meanwhile, the zone of high susceptibility is 29,86%. The result of final validation shows that AUC value from the zoning model made belongs to a good category, which is 0,757.
Geological Engineering Department Universitas Gadjah Mada
2023-04-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/78754
10.22146/jag.78754
Journal of Applied Geology; Vol 7, No 2 (2022); 111–121
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/78754/36226
Copyright (c) 2023 Dwika Rizki Wirawan, Agung Setianto, Esti Handini
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/83471
2023-04-28T03:41:11Z
jag:ART
Petrophysical Study and Rock Type Determination of Siliciclastic Reservoir: Case Study Sand of Bekasap Formation, AF Field, Central Sumatra Basin, Indonesia
Andriyani, Dwi Charisah
Winardi, Sarju
Surjono, Sugeng Sapto
Bekasap Formation;Petrophysical Study;Rock Type Determination;Siliciclastic Reservoir
An integrated subsurface study has been performed for a large and mature field at the Bekasap Formation in Central Sumatra Basin. The Bekasap Formation sand represents an undeveloped reservoir because of its heterogeneity. There are five sand reservoirs (BK1, BK2, BK3, BK4, and BK5) from Bekasap Formation, which each zone or layer bounded by a flooding surface. Each sand reservoir has particular characterization based on petrophysical properties that represent geological process. The petrophysical properties consist of shale volume, porosity, and water saturation obtained by wireline log calculation. This study uses conventional core data to validate the log calculation to achieve an accurate interpretation. Bekasap reservoir is a sandstone reservoir deposited in an estuarine with tide-dominated. Formation evaluation was done to determine the interest zone by petrophysical properties. The result well-log calculation and reservoir cut-offs showed the thickest reservoir in the BK 3 with the best average values of petrophysical properties with an average shale volume 0.32; porosity of 0.245. Otherwise, in rock type determination, four lithofacies are divided in the reservoir based on flow units. The sample RT 1 and RT2 provided the best reservoir zones with HFU1 and HFU2. The RT 3 and RT 4 dominated in HFU3 and HFU4 had the lowest potential zones of reservoir. The final findings showed a good correlation between sedimentologic analysis and petrophysical properties in the rock type determination. As a result, the best reservoir quality development is controlled by the depositional environment (texture and structure) rather than the diagenetic process in this reservoir. It is proven by petrophysical properties in BK1, and BK2 is coastal barrier sand (tidal sand bar) has more clean sand rather than in BK3 and BK4 deposited in the offshore bar.
Geological Engineering Department Universitas Gadjah Mada
LKFT UGM, LPDP
2023-04-30
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://jurnal.ugm.ac.id/jag/article/view/83471
10.22146/jag.83471
Journal of Applied Geology; Vol 7, No 2 (2022); 122–138
2502-2822
2086-5104
eng
https://jurnal.ugm.ac.id/jag/article/view/83471/36238
Copyright (c) 2023 Dwi Charisah Andriyani, Sarju Winardi, Sugeng Sapto Surjono
http://creativecommons.org/licenses/by-sa/4.0