2024-03-28T21:32:00Z
https://journal.ugm.ac.id/index/oai
oai:jurnal.ugm.ac.id:article/6671
2015-07-12T03:01:49Z
jag:ART
LATE OLIGOCENE THOLEIITIC LAVA FROM KENANGA RIVER, TEGALOMBO PACITAN, EAST JAVA
Sartika, Dian Novia
Warmada, I Wayan
Harahap, Bhakti H.
Soewondo, Widiasmoro
Watupatok Formation in Pacitan area consists of lava with basaltic composition and pillow structure. Kenanga river is only 5 km to southeast Watupatok village as type locality of this formation. Kenanga river’s lava were varying from diabasic with paving surface and columnar joint structure to basaltic composition with pillow structure. Lava were found as effusive flow and dike with sandstone inclusion. In field observation, lava exhibits strong porphiritic to aphyric texture, with vesicular to amygdaloidal structure. Plagioclase as phenocryst has mediumsized (2-4 mm) surrounded by volcanic glass as groundmass. Petrographic analysis shows intersertal to hyalophilitic texture, consist of plagioclase, pyroxene and opaque minerals as phenocryst and also groundmass together with volcanic glass. Seconday minerals are quartz, zeolite and calcite. Geochemichal analysis results indicate a low TiO2 (0.8– 0.9 wt.%), medium to high Al2O3 (14–17 wt.%), high Fe2O3 (10–12 wt.%) and low Mg value (Mg#) (39–42). According to TAS and AFM diagram, the rocks is apparently to be basalt and tholeiitic island arc magma. While spidergram pattern of the trace elements shows relatively flat fo HREE and enriched pattern on LREE. Niobium element displays a depleted anomaly, indicated that the crust influences in parental magma, which is another characteristic of magmatic island arc. Based on regional tectonic, the volcanic rocks from Late Oligocene in the area has relationship with subduction processes between Indo-Australia plate and Eurasian plate.Keywords: Pillow structure, tholeiitic, lava, subduction
Geological Engineering Department Universitas Gadjah Mada
2009-01-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/6671
10.22146/jag.6671
Journal of Applied Geology; Vol 1, No 1 (2009)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/6671/5219
Copyright (c) 2009 Dian Novia Sartika, I Wayan Warmada, Bhakti H. Harahap, Widiasmoro Soewondo
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oai:jurnal.ugm.ac.id:article/6672
2015-07-12T03:13:06Z
jag:ART
Road to earthquake mitigation: Lesson learnt from the Yogyakarta earthquake 2006
Pramumijoyo, Subagyo
At early in the morning of May 27, 2006, people of Yogyakarta was stroke by earthquake and mostly heavily damaged building are in lowland or Yogyakarta depression where is occupied by the Young Merapi sediments. The magnitude of earthquake is Mw = 6.2 and USGS rapid moment tensor shows that this earthquake was due to strike-slip fault movement.Seismic history of Yogyakarta area shows that Yogyakarta was stroke by several earthquakes with different epicenter location. At least two earthquakes stroke the area, that is in 1876 and 1943. The damages are similar to the damages of actual earthquake. Yogyakarta depression is mostly covered by Young Merapi sediments that consist of tuff, volcanic ash, breccias, agglomerate and lava with Quaternary in age. The thickness of this sediment is up to 100 m.Our reactive work was to establish firstly zone of damage. For this purpose, we made aerial photograph along the most damaged area. In the same time one of our teams go to the field to measure the cracks, and the other teams to observe liquefaction, hydro geologic measurement, and observation on landslide induce by earthquake. Secondly, we must understand the soil properties and its thickness, because in seismic history it was a similar damage on the same area due to earthquakes however the earthquake epicenters were different. For this purpose we utilize the method of micro-tremors. We also made some drilling until 60 m each, measuring seismic velocity on bore hole, and magneto telluric measurement. We also have helped by Kyushu University in installing micro seismic net work. The research was followed by either undergraduate and graduate students. Fortunately our research was financed by AUN/Seed Net – JICA. Some of the results were published in a book entitled The Yogyakarta Earthquake of May 27, 2006. Another outcome is the Maps of Microzonation and Earthquake Hazard of Bantul Area that dedicated to Bantul people.Based on aerial photograph observation and field observation on Bantul Regency, especially along the Opak River, and to Wonosari to the East, there was no surface ruptures, so there is no fault on surface. Interpretation of aftershock data was showing the difference cluster. There is still open problem in determining either epicenter or aftershock location. The damage building was interpreted as due to its geologic setting, non engineered building, and close to epicenter of earthquake. This heavily damaged building are located on the Young Merapi sediments at Bantul Regency and lake deposits at Gantiwarno and Bayat area where it can amplify the surface seismic wave. It implies that Peak Ground Acceleration according to Indonesian National Standard should be modified in Yogyakarta area.Keywords: Earthquake, seismic, epicenter, micro-tremor, microzonation
Geological Engineering Department Universitas Gadjah Mada
2009-07-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/6672
10.22146/jag.6672
Journal of Applied Geology; Vol 1, No 2 (2009)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/6672/5220
Copyright (c) 2009 Subagyo Pramumijoyo
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oai:jurnal.ugm.ac.id:article/6673
2015-09-02T00:15:24Z
jag:ART
Concentration of sheep manure bacteria in the immobilization of arsenic from groundwater using zero-valent
Wilopo, Wahyu
Sasaki, Keiko
Hirajim, Tsuyoshi
Permeable reactive barrier column tests were performed to investigate whether anaerobic bacteria in sheep manure could help remove As from groundwater. One column served as a control and was packed with zero-valent iron (ZVI), compost leaf, wood chips, glass beads, and gravel, after which it was sterilized. The other (‘inoculated column’) was packed with the same ingredients, with the addition of sheep manure as a source of anaerobic bacteria. Simulated As-contaminated groundwater was prepared based on groundwater samples from Sumbawa Island, Indonesia, but with the arsenic concentration adjusted to 50 mg/L. The inoculated column was found to remove As more effectively from the simulated groundwater than the sterilized one. A gradual decrease in sulfate concentration was observed in the inoculated column at the rate of 0.26 mmol of sulfate/L/day, suggesting that there was sulfate-reducing activity in the microbial population. In addition, the sulfur isotope ratio showed -4.3 (‰) and 0.2 (‰) in influent and effluent, respectively, indicating that sulfate-reducing bacteria (SRB) consumed δ32S preferentially. Using population size estimates from the most probable number (MPN) method, the population of SRB was found to increase with distance traveled in the column. Profiling the community composition of the bacteria in different fractions of the inoculated column using polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) on 16S rRNA sequences suggested that a majority of bacteria were various Clostridium species and one species of Proteobacteria, Geobacter metallireducens GS-15. Some of them may contribute to the removal of arsenic.Keywords: Sheep manure, zero valence iron, arsenic, immobilization, sulfate-reducing bacteria
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://journal.ugm.ac.id/jag/article/view/6673
10.22146/jag.6673
Journal of Applied Geology; Vol 2, No 1 (2010)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/6673/5668
Copyright (c) 2015 Wahyu Wilopo, Keiko Sasaki, Tsuyoshi Hirajim
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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://journal.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://journal.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/7159
2015-09-01T19:47:30Z
jag:ART
Bio-geochemical simulation for solute transport in Piyungan landfill, Yogyakarta Special Province, Indonesia
Phonhalath, Keophousone
Karnawati, Dwikorita
Hendrayana, Heru
Prakasa Eka Putra, Doni
Jinno, Kenji
Piyungan Landfill is the largest in Bantul Regency. According to water quality sampling taken from a leachate pond, there are significant contaminant issues resulting from landfill leachate. The objectives of this research were achieved by applying a two-dimensional bacteria mediated reduction numerical model was applied. Method of characteristic was applied to solve the advection part of the solute transport equation. Three bacteria (X1, X2, and X3) groups were defined in the redox model. In the conceptual model, bacterial X1 utilizes oxygen under aerobic conditions and nitrate, NO-3 under aerobic conditions as electron acceptors. Consequently, under aerobic conditions bacteria X2, and X3 utilize MnO2, and Fe(OH)3 respectively as electron acceptors. In the redox model organic carbon which was defined as CH2O was considered as the electron donor for all bacteria mediated reduction reactions. The results of research are to improve the understanding of biogeochemical processes in aquifer.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7159
10.22146/jag.7159
Journal of Applied Geology; Vol 3, No 1 (2011)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7159/5616
Copyright (c) 2015 Keophousone Phonhalath, Dwikorita Karnawati, Heru Hendrayana, Doni Prakasa Eka Putra, Kenji Jinno
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oai:jurnal.ugm.ac.id:article/7177
2015-09-01T19:53:22Z
jag:ART
The mineralogy of gold-copper skarn related porphyry at the Batu Hijau deposit, Sumbawa, Indonesia
Thwee Aye, May
Pramumijoyo, Subagyo
Idrus, Arifudin
Setijadji, Lucas Donny
Imai, Akira
Araki, Naoto
Arif, Johan
Clacic gold-copper bearing skarn in the Batu Hijau porphyry deposit is located in the western part of Sumbawa Island, Indonesia. Skarn mineralizations were found at the deep level of the deposit (-450m to -1050mL) by drilling program 2003. No evidence around Batu Hijau has limestone although most skarn are metasomatiz ed from carbonate-rich rock as limestone or marble. Most skarn-type metasomatic alteration and mineralization occurs at the contact of andesitic volcanic rock and intermediate tonalite porphyry intrusion and within intermediate tonalite in some. Although both endoskarn and exoskarn can be developed, it has no clear minerals to known the endoskarn. Exoskarn is more principle skarn zone. The formation of skarn occurred two min stages: (1) prograde and (2) retrograde. The prograde stage is temporally and spatially divided into two sub-stages as early prograde (sub-stage I) and prograde metasomatic (sub-stage II). Sub-stage I begin immediately after the intrusion of the tonalite stock into the calcium rich volcanic rocks. Then, sub-stage II originated with segregation and evolution of a fluid phase in the pluton and its invasion into fractures and micro-fractures of host rocks developed during sub-stage I. The introduction of considerable amount of Fe, Si and Mg led to the large amounts of medium- to coarse-grained anhydrous calc-silicates. From the texture and mineralogy, the retrograde metasomatic stage can be divided into two sub-stages: (a) early retrograde and (sub-stage III) and (b) late retrograde (sub-stage IV). During sub-stage III, the previously formed skarn zones were affected by intense multiple hydro-fracturing phases in the gold-copper bearing stocks. Therefore, the considerable amounts of hydrous calc-silicates (epidote), sulfides (pyrite, chalcopyrite, sphalerite), oxides (magnetite, hematite) and carbonates (calcite) replaced the anhydrous calc-silicates. Sub-stage IV was coexisting with the intrusion of relatively low temperature, more highly oxidizing fluids into skarn system, bringing about partial alteration of the early-formed calc-silicates and developing a series of very fine-grained aggregrates of chlorite, clay, hematite and calcite.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7177
10.22146/jag.7177
Journal of Applied Geology; Vol 3, No 1 (2011)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7177/5617
Copyright (c) 2015 May Thwee Aye, Subagyo Pramumijoyo, Arifudin Idrus, Lucas Donny Setijadji, Akira Imai, Naoto Araki, Johan Arif
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oai:jurnal.ugm.ac.id:article/7178
2015-09-01T19:59:16Z
jag:ART
Study on mineralogy and chemistry of the saprolitic nickel ores from Soroako, Sulawesi, Indonesia: Implication for the lateritic ore processing
Sufriadin, Sufriadin
Idrus, Arifudin
Pramumijoyo, Subagyo
Warmada, I Wayan
Imai, Akira
An investigation of mineralogy and chemistry of saprolitic nickel ores developed on ultramafic rock with different serpentinization degree from Soroako, Sulawesi has been conducted using X ray diffraction, thermal analysis, FTIR, and ICP-AES. The implication for the processing of these ores under acidic media was also studied. Weathering of unserpentinized peridotite in the Soroako west block produces saprolitic ore containing minerals such as relict olivine, goethite, quartz, talc with minor serpentine and smectite; whereas the weathered materials overlaying serpentinized peridotite in the Petea area are mainly composed of residual serpentine with lesser chlorite, maghemite, and remnant pyroxene and amphibole. Chemical analysis determined by ICP-AES demonstrates that west ore is higher in Si, Mg, and Ni, as compared to that Petea ore. Conversely, Fe and Al concentrations are higher in Petea ore than in west block ore. SEM-EDX examination reveals that olivine, talc, serpentine and goethite are the Ni-bearing phases occurring in west block ore; while serpentine is the principal host for Ni in the Petea ore. Chemical leaching under sulfuric acid reveals that olivine has highest dissolution rate in the west ore followed by serpentine; while talc, pyroxene, and iron oxides have slow dissolution rates. In contrast, serpentine in Petea ore is easily dissolved and is followed by chlorite; whereas amphibole, pyroxene, and maghemite are difficult to leach. Quartz is present in both ores and it seems to be undissolved during the chemical leaching. It is shown that Ni recovery from Petea saprolitic ore is higher than that of West Block ore.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7178
10.22146/jag.7178
Journal of Applied Geology; Vol 3, No 1 (2011)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7178/5618
Copyright (c) 2015 Sufriadin Sufriadin, Arifudin Idrus, Subagyo Pramumijoyo, I Wayan Warmada, Akira Imai
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oai:jurnal.ugm.ac.id:article/7179
2015-09-01T20:04:11Z
jag:ART
Mineral paragenesis and fluid inclusions of the Bincanai epithermal silver-base metal vein at Baturappe area, South Sulawesi, Indonesia
Nur, Irzal
Idrus, Arifudin
Pramumijoyo, Subagyo
Harijoko, Agung
Imai, Akira
The Baturappe prospect located at southern part of Sulawesi island, Indonesia, is a hydrothermal mineralization district which is characterized by occurrence of epithermal silver-base metal deposits. The mineralization is hosted in basaltic-andesitic volcanic rocks of the late Middle-Miocene Baturappe Volcanics. More than 20 units of quartz – base metal veins are distributed in the area, and one of the most significant is the Bincanai vein. This study is aimed to characterize the mineral paragenesis and to elucidate the physicochemical conditions of the formation of the deposit on the basis of mineral assemblage and fluid inclusion mictrothermometry. Sulphide assemblages in the vein indicate an intermediate sulfidation state epithermal; beside galena and sphalerite as the early stage minerals, chalcopyrite, tennantite, and tetrahedrite are also identified as the later stage. Microthermometric study of fluid inclusions in quartz indicates formation temperature of the vein ranges from about 230 to 280°C Histogram of homogenization temperature suggests that there are two generations of hydrothermal fluid responsible for the ore mineralization in the vein; the higher temperature range represents formation temperature of the base metal (galena, sphalerite), while the lower temperature range is correlate with the precipitation of the rest relatively lower temperature sulphides (chalcopyrite, pyrite, tetrahedrite, tennantite, polybasite, and Bi-Ag-Cu-Fe-bearing sulfide). The sequence is also consistent with the mineral paragenetic. The mean of salinity (2.0–2.5 wt.% NaCl eq.) indicates that fluid responsible for the mineralization in the Bincanai vein is relatively low-salinity fluid.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7179
10.22146/jag.7179
Journal of Applied Geology; Vol 3, No 1 (2011)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7179/5619
Copyright (c) 2015 Irzal Nur, Arifudin Idrus, Subagyo Pramumijoyo, Agung Harijoko, Akira Imai
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oai:jurnal.ugm.ac.id:article/7180
2015-09-01T20:07:52Z
jag:ART
Petrogenetic interpretation of granitoid rocks using multicationic parameters in the Sanggau Area, Kalimantan Island, Indonesia
Linn Zaw, Kyaw
Setijadji, Lucas Donny
Warmada, I Wayan
Watanabe, Koichiro
Granitoid rock compositions from a range of tectonic environments are plotted on a multicationic diagram, based on major and trace element geochemistry and K-Ar dating. This shows that there is a different tectonic nature, rock affinity and suites. The basement granitoid rocks are ranging from diorite to granite composition. They appear to the products of crystallization differentiation of a calc-alkaline magma of island affinity and range to metaluminous granites, granodiorite and tonalite. The tectonic setting has two kinds which are subduction and post-subduction. The geochemical interpretation, origin and melting of mechanism and tectonic setting shows the types of granitoid are M and I-M type. The basement of granite and granodiorite are a segment of island arc that were happened the Sintang Intrusion as post subduction or syn-collision tectonic setting.
Keywords: Petrogenetic, tectonic, affinity, Sintang Intrusion, Kalimantan
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7180
10.22146/jag.7180
Journal of Applied Geology; Vol 3, No 1 (2011)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7180/5620
Copyright (c) 2015 Kyaw Linn Zaw, Lucas Donny Setijadji, I Wayan Warmada, Koichiro Watanabe
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oai:jurnal.ugm.ac.id:article/7181
2015-09-01T20:11:15Z
jag:ART
Geology and characteristics of Pb-Zn-Cu-Ag skarn deposit at Ruwai, Lamandau Regency, Central Kalimantan
Idrus, Arifudin
Setijadji, Lucas Donny
Tamba, Fenny
Anggara, Ferian
This study is dealing with geology and characteristics of mineralogy, geochemistry and physicochemical conditions of hydrothermal fluid responsible for the formation of skarn Pb-Zn-Cu-Ag deposit at Ruwai, Lamandau Regency, Central Kalimantan. The formation of Ruwai skarn is genetically associated with calcareous rocks consisting of limestone and siltstone (derived from marl?) and controlled by NNE-SSW-trending strike slip faults and localized along N 70° E-trending thrust fault, which also acts as contact zone between sedimentary and volcanic rocks in the area. Ruwai skarn is mineralogically characterized by prograde alteration (garnet and clino-pyroxene) and retrograde alteration (epidote, chlorite, calcite and sericite). Ore mineralization is characterized by sphalerite, galena, chalcopyrite and Ag-sulphides (particularly acanthite and argentite), which formed at early retrograde stage. Geochemically, SiO2 is enriched and CaO is depleted in limestone, consistent with silicic alteration (quartz and calc-silicate) and decarbonatization of the wallrock. The measured reserves of the deposit are 2,297,185 tonnes at average grades of 14.98 % Zn, 6.44 % Pb, 2.49 % Cu and 370.87 g/t Ag. Ruwai skarn orebody originated at moderate temperature of 250-266 °C and low salinity of 0.3-0.5 wt.% NaCl eq. The late retrograde stage formed at low temperature of 190-220 °C and low salinity of ~0.35 wt.% NaCl eq., which was influenced by meteoric water incursion at the late stage of the Ruwai Pb-Zn-Cu-Ag skarn formation.
Keywords: Geology, skarn, mineralogy, geochemistry, Ruwai, Central Kalimantan
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7181
10.22146/jag.7181
Journal of Applied Geology; Vol 3, No 1 (2011)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7181/5621
Copyright (c) 2015 Arifudin Idrus, Lucas Donny Setijadji, Fenny Tamba, Ferian Anggara
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oai:jurnal.ugm.ac.id:article/7182
2018-01-15T03:32:04Z
jag:ART
Characteristics and genesis of montmorilonitic claystone from Bandung area, Wonosegoro, Boyolali, Central Java, Indonesia
Yuliyanti, Anita
Warmada, I Wayan
Titisari, Anastasia Dewi
The Bandung bentonite deposit is located in Wonosegoro District, Boyolali Regence, Central Java. Characteristics of bentonite in this area are very important due to increase demand on bentonite in the industry. Several methods are used to characterize the bentonite in this area, such as PLM (polarizing light microscope), X-Ray Diffraction and Scanning Electron Microscope combined with EDX measurements. The montmorilonitic claystone belongs to Kerek Formation from Banyuurip Member. This deposit consists of mainly montmorilonitic claystone interbedded with tuffaceous sandstone. Petrographical analysis shows that montmorilonitic claystone consists of mostly clay minerals with small amount of calcite, volcanic glass, feldspar, quartz, and opaque minerals. The clay minerals are likely as alteration product of volcanic glass. The oriented XRD analyses show that the clay samples consist of Ca-montmorilonite, illite, and kaolinite. Physico-chemical analyses of montmorilonitic claystone display that the initial CEC (cation exchange capacity) is 20 mgrek.Na2O/200gr (54 mg.Na2O/100gr) and low swelling ability for about 2 times of its initial volume. Based on its mineralogical association, textures, and stratigraphic position, the montmorilonite is formed from devitivication of volcanic glass in a diagenetic environment with over 2 km thicks of overburden. Keywords: Bentonite, montmorillonitic claystone, devitrivication, diagenesis, montmorillonite
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7182
10.22146/jag.7182
Journal of Applied Geology; Vol 3, No 1 (2011)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7182/5622
Copyright (c) 2015 Anita Yuliyanti, I Wayan Warmada, Anastasia Dewi Titisari
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oai:jurnal.ugm.ac.id:article/7183
2015-09-01T20:15:11Z
jag:ART
Adsorption of heavy metal by natural clayey soil
Budianta, Wawan
This study focused on the capability of Clayey soil to retain and release heavy metals. Batch experiment for sample of clayey soil was conducted with several concentrated solutions of heavy metals. The results show that the clayey soil sample may have a relatively high heavy metal retention capacity. This is particularly positive in the context of municipal waste disposal (landfills) in Indonesia
Keywords: Adsorption, heavy metal, clayey soil, batch experiment
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7183
10.22146/jag.7183
Journal of Applied Geology; Vol 3, No 1 (2011)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7183/5623
Copyright (c) 2015 Wawan Budianta
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oai:jurnal.ugm.ac.id:article/7184
2015-09-01T20:20:30Z
jag:ART
Lateritization process of peridotites in Siruka, Choiseul, Solomon Islands
V. Sagapoa, Christopher
Imai, Akira
Ogata, Takeyuki
Yonezu, Kotaro
Watanabe, Koichiro
The lateritic weathering crusts exposed in Siruka, Choiseul Islands, Solomon Islands, were developed on the expense of serpentinized peridotite underlain by Siruka schists and Voza lavas with a subhorizontal contact. The lateritic profiles consist of three generalized zones: bedrock, saprolitic zone (weathered and decomposed zone) and the limonitic zones. The profiles demonstrate variations in depths and continuity but illustrate mineralogy and geochemical affinity down profile and are analogous to saprolitic nickel laterite deposits. Silica and magnesia in the bed rock and the saprolitic zones have been removed and only the residual elements (iron, chromium, aluminium, manganese, cobalt and nickel) remain in the limonitic zone. These elements are relatively concentrated as a result of the removal of the soluble elements. Nickel is associated with silica and magnesia, as lizardite ormixed gels (garnierite nickel ore) at the weathering fronts. On the other hand, nickel, with generally low concentrations (
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7184
10.22146/jag.7184
Journal of Applied Geology; Vol 3, No 2 (2011)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7184/5624
Copyright (c) 2015 Christopher V. Sagapoa, Akira Imai, Takeyuki Ogata, Kotaro Yonezu, Koichiro Watanabe
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7185
2015-09-01T20:22:32Z
jag:ART
Ground movement prediction due to block caving mining geometry using GIS
Setianto, Agung
Widijanto, Eman
Large scale block cave mining has been operated for over 30 years in the Erstberg Mining District in the province of Papua, Indonesia. The ore body is divided into four vertically stacked ore bodies: Gunung Bijih Timur (GBT), Intermediate Ore Zone (IOZ), Deep Ore Zone (DOZ), and Deep Mill Level Zone (DMLZ). The GBT and IOZ mines were closed on 1993 and 2003, DOZ mine is in its peak production performance 80 ktpd, and DMLZ mine is still in the development stage to prepare mine infrastructures. This situation generates gradual downward settling of the surface or subsidence. Significant deformation changes at the surface by block caving subsidence could damage the mine’s infrastructures in surface and underground and also affect geological structures overlying the mining areas which may result in surface impacts on the natural geomorphology and land use.
In this paper, integrated system based on Geographic Information System (GIS) platform applied to predict ground movements due to underground mining. Deep Ore Zone (DOZ) block cave mine is studied for subsidence prediction. The mining extraction thickness model is obtained from height of draw (HOD) observed data. Subsidence Engineering Handbook (SEH) of empirical model and measured data from mining fields is used for subsidence calculation parameters. The calculations were performed in GIS. The maximum vertical displacement has been predicted about 12m by means of full caving mining method.
Keywords: Ground movements, block caving, GIS, underground mining, and subsidence
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7185
10.22146/jag.7185
Journal of Applied Geology; Vol 3, No 2 (2011)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7185/5625
Copyright (c) 2015 Agung Setianto, Eman Widijanto
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7186
2015-09-01T20:25:39Z
jag:ART
Geo-disaster Laharic Flow along Putih River, Central Jawa, Indonesia
Surjono, Sugeng Sapto
Yufianto, Ahmad
In 2011, laharic flow transporting volcanic materials had significantly occurred along Putih River, causing severe damage in Jumoyo area, Magelang, Central Java, Indonesia. The disaster happened frequently until April 2011. The approximately 150 million cubic meter of volcanic materials expelled from 2010 Merapi eruption has been assumed as main cause of recent laharic flow. Although pyroclastic deposit mostly flew to south and southeastern direction through Woro, Gendol, and Opak Rivers, laharic flow apparently flew to the west – westward directions through Putih and Pabelan Rivers. This study will explain the mechanism of such disaster along Putih River from sedimentological point of view.
Transport mechanism of laharic flow along river is strongly controlled by the slope and type of fluids. In the upper stream area, debris flow commonly occurs as gravity flow in the steep slope. To the downstream area, where more river and surface water infiltrates the volcanic material transportation, laharic flow mechanism transforms to hyperconcentrated flow. In the gently slope area, laharic flow decreases in concentration but increase in amount because of the accumulation influx from several river flows. Hyperconcentrated flow in Putih River is mostly generated by accumulation of river flow in the tributary area. In such area, loose volcanic materials are eroded easily by surface water. Rill and gully erosion bring volcanic material into main channel of Putih River, followed by intensive vertical erosion along upper stream that will produce bigger accumulation of volcanic material within laharic flow in the downstream area. Several sabo dams along the Putih River were damaged during early period of laharic flow due to this transportation mechanism.
At the downstream of in Gempol Village, Jumoyo Area, the main channel of Putih River is shifting northwestward significantly due to Gendol Hill. On the other hand, river body in this settlement area is narrower compared to the upper stream area just before turning point. Both condition cause laharic flow to spill out from the channel and form an unconfined sheet debris flow with a 500 m width and around 2-4 m thick sediments. Although energy of transport is reduced significantly, but this flow is still able to transport abundant volcanic material ranging from silt to boulder. Traditional market and hundreds of houses were buried and the main road from Yogyakarta to Magelang city has been disconnected for several times due to this disaster.
Keywords: Putih River, Laharic flow, Jumoyo
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7186
10.22146/jag.7186
Journal of Applied Geology; Vol 3, No 2 (2011)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7186/5626
Copyright (c) 2015 Sugeng Sapto Surjono, Ahmad Yufianto
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7187
2015-09-01T20:27:31Z
jag:ART
The potential impact of ash Merapi Volcano eruption 2010 in Yogyakarta, Indonesia, for the environment and human health
Budianta, Wawan
The eruptions of Merapi Volcano began in late October 2010 and continued into early November 2010. Among parts of materials ejected by Merapi Volcano, volcanic ash is considered to be a respiratory health hazard because of several potentially toxic components: respirable crystalline silica and metals. The objective of this study is to review the grain size of volcanic ash and to analyze the composition of volcanic ash which is suspected to carry a variety of potentially toxic elements. The result of this study shows that very fine grain size of volcanic ash were detected which has a potential to become respiratory problem trigger. The heavy metals were also detected in ash samples. On the other hand, total sulfur content was also considered high and the source of this sulfur was sulfur dioxide during eruption.
Keywords: Merapi volcano, eruption, volcanic ash, health hazard, toxic elements.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7187
10.22146/jag.7187
Journal of Applied Geology; Vol 3, No 2 (2011)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7187/5627
Copyright (c) 2015 Wawan Budianta
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7188
2015-09-01T20:30:07Z
jag:ART
Evolution of groundwater chemistry on shallow aquifer of Yogyakarta City urban area
Eka Putra, Doni Prakasa
Since 1980s, accelerated by urbanization, Yogyakarta City was shifting to many directions defined by main road networks and service centres. Urbanization has transformed rural dwellings to become urban settlements and generated urban agglomeration area. Until now, new business centres, education centres and tourism centres are growing hand in hand with new settlements (formal or informal) without proper provision of water supply and sanitation system. This condition increase the possibility of groundwater contamination from urban wastewater and a change of major chemistry of groundwater as shallow unconfined aquifer is lying under Yogyakarta City. To prove the evolution of groundwater chemistry, old data taken on 1980s were comparing with the recent groundwater chemistry data. The evaluation shows that nitrate content of groundwater in 1980s was a minor anion, but nowadays become a major anion, especially in the shallow groundwater in the centre of Yogyakarta City. This evidence shows that there is an evolution of groundwater chemistry in shallow groundwater below Yogyakarta City due to contamination from un-proper on-site sanitation system.
Keywords: Urbanization, Yogyakarta city, rural dwellings, settlements, agglomeration, contamination, groundwater
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7188
10.22146/jag.7188
Journal of Applied Geology; Vol 3, No 2 (2011)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7188/5628
Copyright (c) 2015 Doni Prakasa Eka Putra
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7189
2015-09-01T20:32:25Z
jag:ART
Removal of mercury (Hg) from contaminated water at traditional gold mining area in Central Kalimantan
Wilopo, Wahyu
Rahman, Denizar
Eka Putra, Doni Prakasa
Warmada, I Wayan
There are many traditional gold mining and processing in Murung Raya Regency, Central Kalimantan. The processing of gold mostly uses mercury (Hg) and produces a lot of waste water. It just throws to the river without any treatment. Therefore the concentration of mercury (Hg) in the river water is over than the standard of drinking water and reach up to 0.346 mg dm-3. This situation is very dangerous because almost of the people in the downstream area depend on the river water for their daily purposes. To solve this problem, tuff from local material was used to remove mercury using batch experiment. The result showed that tuff has capability to remove mercury in the significant amount. The main mechanism of mercury removal by tuff is cation exchange processes due to high surface area of tuff. The result of this study can be used as an alternative for waste water treatment in mining area.
Keywords: Traditional mining, mercury removal, tuff
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7189
10.22146/jag.7189
Journal of Applied Geology; Vol 3, No 2 (2011)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7189/5629
Copyright (c) 2015 Wahyu Wilopo, Denizar Rahman, Doni Prakasa Eka Putra, I Wayan Warmada
http://creativecommons.org/licenses/by-sa/4.0
oai:ojs.journal.ugm.ac.id:article/7190
2015-09-01T23:22:02Z
jag:ART
oai:jurnal.ugm.ac.id:article/7191
2018-01-19T00:58:50Z
jag:ART
ORE MINERALOGY AND MINERAL CHEMISTRY OF PYRITE, GALENA, AND SPHALERITE AT SORIPESA PROSPECT AREA, SUMBAWA ISLAND, INDONESIA
Kant, Win
Warmada, I Wayan
Idrus, Arifudin
Setijadji, Lucas Donny
Watanabe, Koichiro
The Soripesa prospect area is located at Maria village, Wawo district, Bima region in the East Sumbawa Island, Indonesia. Lithology is dominantly composed of a lithic-crystal tuff of andesitic and dacitic composition and bedded limestone. The polymetallic epithermal quartz veins are hosted by andesitic volcaniclastic rocks. Within these veins, multiphases, colloform-crustiform, bedding to massive textures with pyrite, sphalerite, galena, chalcopyrite, chalcocite, azurite, and malachite are observed. Selected samples were analyzed by using ore microscopy and SEM-EDX. Ore minerals show replacement, ex-solution, colloform, and zonal textures. The paragenesis diagram was made from a careful study of polished sections and thin sections. Textures of ore minerals such as banded, exsolution, replacement, and zone, have been interpreted to correspond to the order of deposition. In pyrite, the average content of Co (0.45 wt.%) is higher than Ni content (0.14 wt.%) and it means that their origin may be hydrothermal origin. Average content ratio, Co:Ni is 2.81. Galena shows a low Ag content of 0.07 %in average. But they show a high Au content of 1.48 %in average. Sphalerite shows a low Fe content of 1.04 %in average and occasionally chalcopyrite inclusion/disease also occurred. Ga and Ge contents are also high in sphalerite. Co>Ni in pyrite, low content of Ag in Galena, low content of Fe and mole % FeS in sphalerite, high content of Ga and Ge, and log (Ga/Ge) in sphalerite, show that pyrite, galena, and sphalerite from Soripesa prospect area were formed under low temperature condition of hydrothermal fluid. Keywords: Ore textures, paragenesis, deposition, hydrothermal fluid, low temperature
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7191
10.22146/jag.7191
Journal of Applied Geology; Vol 4, No 1 (2012)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7191/5630
Copyright (c) 2015 Win Kant, I Wayan Warmada, Arifudin Idrus, Lucas Donny Setijadji, Koichiro Watanabe
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7192
2018-01-19T00:55:47Z
jag:ART
COASTAL AQUIFER GROUNDWATER MODELING IN THE SOUTHERN PART OF YOGYAKARTA AREA, INDONESIA
Rata, Doung
Eka Putra, Doni Prakasa
Hendrayana, Heru
Parangtritis beach, located in a coastal aquifer at the southern part of Yogyakarta Province, Indonesia is bounded by the Indian Ocean at the South, Opak River at the West, and Tertiary Limestone Rock to the East. Local land-use is predominantly agriculture, rice fields and settlements and the population is estimated to be 9,386 persons as per the 2012 census. The total surface area is estimated at 9.46 km2. The aims of this research were to understand the system of groundwater and to assess and predict saltwater intrusion by conducting a numerical groundwater model. Hydrological and hydrogeological data were collected directly from the field and from previous work for input into the model. The model simulates an unconfined aquifer system where the aquifer thickness varies from 30-40 meters. The material of the aquifer consists of sand varying from fine to coarse grain size and fine gravel with hydraulic conductivity values of 8.974 × 10−4, 1.794 × 10−3, and 1.337 × 10−3 m/s at the northern, central, and southern part of the research area, respectively. The maximum length of the saltwater interface was estimated at about 205.1 m laterally and 40 m vertically relative to the location of the groundwater table around 1m above sea level. Direction of groundwater flow is from north to south. Groundwater table elevation equals 5 m at the north and 0 m at the south with a hydraulic gradient estimated at about 2.45 × 10−3. As a result of a steady-state simulation as well as two cases of prediction for five and ten years in the future, it is determined that that the salinity of the surrounding environment is not potentially adverse to the groundwater quality in the study area. This is in part due to low population in this area and abundant groundwater resources, as well as the results of the groundwater model. Keywords: Coastal aquifer, numerical groundwater model, conceptual model, observed heads
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7192
10.22146/jag.7192
Journal of Applied Geology; Vol 4, No 1 (2012)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7192/5631
Copyright (c) 2015 Doung Rata, Doni Prakasa Eka Putra, Heru Hendrayana
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7193
2018-01-19T00:59:46Z
jag:ART
Removal Of Copper From Water Using Columns Experiment Of Lignite, Shale, And Ironsand
Boreborey, Ty
Wilopo, Wahyu
Eka Putra, Doni Prakasa
Experimental studies using column testing of lignite, shale, and ironsand in copper solution were carried out to determine the adsorption capacity of lignite, shale, and ironsand in remediation of water contaminated with copper. Lignite, shale, and ironsand were analyzed using XRD, SEM/EDX, and XRF. The treatment process by column adsorption was carried out over a period of 24 hours at a stable velocity of 0.005ml/s. After treatment, the remaining copper in the solution was recorded, thus allowing the adsorption capacity of lignite, shale, and ironsand to be calculated. The results revealed that when the solution was treated by lignite and shale there was a good degree of copper removal, while the ironsand had very poor degree of copper removal. The best material for copper removal was lignite with 25-mesh grain size. Pyrite, graphite, calcite, and illite were found in lignite and smectite, calcite, pyrite, hematite, and illite were found in shale. These materials were also shown to contain an abundance of high-valence elements in Al2O3, SiO2, and Fe3O4 which contributes to additional adsorption capacity. CAC values for lignite and shale reached nearly to 100%, suggesting that lignite and shale have a high adsorption capacity. In contrast, ironsand, which has mostly sand minerals with little clay and organic content, caused the pollutant to move rapidly to the water table, reducing the adsorption potential. CAC values treated by ironsand were shown to be negative which showed an increasing of Cu2+ in natural ironsand into solution. Keywords: Copper, ironsand, shale, lignite, column experiment
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7193
10.22146/jag.7193
Journal of Applied Geology; Vol 4, No 1 (2012)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7193/5632
Copyright (c) 2015 Ty Boreborey, Wahyu Wilopo, Doni Prakasa Eka Putra
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7194
2018-01-19T01:01:04Z
jag:ART
Kinetic And Equilibrium Studies On The Adsorption Of Pb2+ And Zn2+ From Aqueous Solution Using Coco-Peat By Batch Experiment
Waskita, Kukuh Jalu
C. Resurreccion, Augustus
Budianta, Wawan
The presence of heavy metals in surface water, which is common in mining area pose harmful effect to human health and the environment. Recently, cocopeat has been studied as an effective sorbent material for removing heavy metals from wastewater. In this study, kinetic was done by analyzing the distribution of the heavy metal in sorbent material and liquid phase after mixing 50 mg/L solution of lead (Pb2+) and zinc (Zn2+)in single solute system with 0.1 g of coco-peat, that were consequently shaken at 5, 10, 15, 30, 60, 120, 180 and 360 minutes. To determine the equilibrium adsorption isotherm for each heavy metal, the solutions of 10, 20, 30,40 and 50 mg/L of Pb2+ and Zn2+ were prepared separately. Two different pH levels (natural pH, and pH 4) were setto describe the sorption behavior of Pb2+ and Zn2+ of each heavy metal.Using data from batch experiments, appropriate kinetic (time dependency) and equilibrium (isotherm) models were fitted on the sorbent material and liquid phase concentrations to determine adsorption parameters. Pseudo second-order kinetic model fitted well to the kinetic data due to chemisorption that happened during experiments. In other hand, Langmuir model fitted well to the equilibrium, this indicates that the sorption of lead and zinc on coco peat is monolayer and that the adsorbent’s surface is homogenous. The increase of heavy metals adsorption following the increase of pH might be due to negative charge of coco peat surface. Pb2+ adsorbed more than Zn2+ because ion with high hydration enthalpy will have smaller amount of ion adsorbed. The hydration enthalpies for Pb2+ and Zn2+ are 23 kJ/kg and 113 kJ/kg, receptively. Considering all the factors that we have discussed, cocopeat has high efficiency to remove the heavy metals from wastewater. Keywords: Coco-peat, adsorption, batch experiment, kinetic, equilibrium.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7194
10.22146/jag.7194
Journal of Applied Geology; Vol 4, No 1 (2012)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7194/5633
Copyright (c) 2015 Kukuh Jalu Waskita, Augustus C. Resurreccion, Wawan Budianta
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7195
2018-01-19T01:02:15Z
jag:ART
Removal Of Lead (Pb2+) From Aqueous Solutions By Natural Bentonite
Wilopo, Wahyu
Eka Putra, Doni Prakasa
Warmada, I Wayan
Hirajima, Tsuyoshi
The aim of the present work is to investigate the ability of natural bentonite (untreated) from Pacitan, East Java to remove lead ions from aqueous solution. The bentonite has specific surface area and cation exchange capacity of 27.52 m2 g−1 and 65.20 meq/100 gr of bentonite, respectively. Towards this aim, batch adsorption experiments were carried out and the effect of various parameters on this removal process has been investigated. The effects of pH, grain size of bentonite, adsorption time and lead ion concentration on the adsorption process were examined. The optimum pH for adsorption was found to be 9, with the finer grain size of bentonite is more effective. In adsorption studies, residual lead ions concentration reached equilibrium in a duration of 24 hours. Adsorption of lead on bentonite appeared to follow Freundlich isotherm. Our results demonstrate that the adsorption process was mostly dominated by ion exchange process. Keywords: Removal, lead, aqueous solution, natural bentonite, adsorption.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7195
10.22146/jag.7195
Journal of Applied Geology; Vol 4, No 1 (2012)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7195/5634
Copyright (c) 2015 Wahyu Wilopo, Doni Prakasa Eka Putra, I Wayan Warmada, Tsuyoshi Hirajima
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7196
2018-01-19T01:02:59Z
jag:ART
Regional Depositional Model Of South Makassar Basin Depocenter, Makassar Strait, Based On Seismic Facies
Hidayat, Rahmadi
Husein, Salahuddin
Surjono, Sugeng Sapto
South Makassar Basin Depocenter (SMBD) is located in Southern Makassar Strait which has petroleum potential by the presence of oil and gas indications within the area based on Airborne Laser Fluorescence survey. However, detail studies within this area are not developed well. One of the studies which can be utilized for further discoveries of oil and gas field in SMBD is a study of depositional model using seismic facies method to maximize limited seismic and well data. Interpretation of depositional model in Eocene (syn-rift phase) was varied from alluvial plain and alluvial fan complex, continued gradually to platform. In Oligocene time (post-rift phase), massive transgression caused a major deepening in entire SMBD where the depositional environment changed to basinal plain. In early Miocene – recent interval (syn-orogenic phase), SMBD was relatively in stable condition at basinal plain environment. Lower Tanjung Sequence will be the most prolific petroleum play in SMBD due to its adequate source rock, reservoir rock and seal rock as well. Keywords: South Makassar basin, depositional model, seismic facies
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7196
10.22146/jag.7196
Journal of Applied Geology; Vol 4, No 1 (2012)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7196/5635
Copyright (c) 2015 Rahmadi Hidayat, Salahuddin Husein, Sugeng Sapto Surjono
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7197
2018-03-02T01:56:48Z
jag:ART
Batch Studies On Arsenic Adsorption Onto Lignite, Bentonite, Shale And Iron Sand: Effects Of Ph, Time, Particle Size And Sulfate Concentration
Kyu Mar, Kyu
Karnawati, Dwikorita
Eka Putra, Doni Prakasa
Sarto, Sarto
Igarashi, Toshifumi
Tabelin, Carlito Baltazar
Arsenic (As) is a toxic element found in both natural and anthropogenic sources. High concentration of this element was recently uncovered in the groundwater of Sumbawa Island, Indonesia. To mitigate this problem, As adsorption potential of natural geological materials like lignite, bentonite, shale, and iron sand obtained in Indonesia were evaluated by batch experiments. Arsenic adsorption onto these materials was investigated as a function of solution pH, particle sizes of adsorbents and coexisting sulfate concentration. In addition, batch leaching experiments were performed to elucidate the stability of geogenic As present in all adsorbents at different pHs. The results showed that among these natural materials tested, lignite was the most effective adsorbent of As(V) followed by bentonite, shale and then iron sand, and that the amounts of As(III) adsorbed onto all adsorbents were lower than those of As(V).This indicates that As(III) is more mobile in comparison to As(V). The adsorption isotherms of As(III) and As(V) conformed to nonlinear types, either Langmuir or Freundlich. It was found that adsorption of As onto these natural adsorbents was pH-dependent. This could be attributed to the changes in the surface charges of the adsorbents with pH. With respect to the adsorbent particle size, the amount adsorbed somewhat increased with decreasing particle size, which could be explained by the larger surface area of the smaller particles. Acidic (pH < 6) and alkaline (pH >10) conditions destabilized the geogenic As content of the adsorbents, indicating that the effectiveness of these natural materials as adsorbents is greatly limited by the pH of the contaminated system. Keywords: Adsorption, arsenic, natural geological materials, particle size, pH
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7197
10.22146/jag.7197
Journal of Applied Geology; Vol 4, No 2 (2012)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7197/5636
Copyright (c) 2015 Kyu Kyu Mar, Dwikorita Karnawati, Doni Prakasa Eka Putra, Sarto Sarto, Toshifumi Igarashi, Carlito Baltazar Tabelin
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7198
2018-03-02T01:58:37Z
jag:ART
Copper Mobility Assessment Using Speciation Schemes: Case Study–Mantrijeron District, Yogyakarta, Indonesia
Xaixongdeth, Phetnakhone
Hendrayana, Heru
Eka Putra, Doni Prakasa
Karnawati, Dwikorita
Sato, Tsutomu
factors such physical and chemical properties, especially mineralogical composition of such environment. This study focused on the mineralogical of two soils types (fine sandy loam and loamy fine sand) to retain/mobile Cu. Two non contaminated soils from Yogyakarta urban area, Indonesia, were artificially contaminated with Cu solution. Subsequently, soils artificially contaminated were extracted from various geochemical phases of soil by sequential extraction procedure. The results show that both of soils types can retain Cu well with maximum is 5.8 mg/g of loamy fine sand and 3.9mg/g of fine sandy loam. Additionally, the iron amorphous phase content in clay fraction is influence Cu retains in these soils. This is advantage in environment of Yogyakarta urban area, Indonesia, where this area underlain by loamy sand soil. Keywords: Copper, mobility, iron, sequential extraction.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7198
10.22146/jag.7198
Journal of Applied Geology; Vol 4, No 2 (2012)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7198/5637
Copyright (c) 2015 Phetnakhone Xaixongdeth, Heru Hendrayana, Doni Prakasa Eka Putra, Dwikorita Karnawati, Tsutomu Sato
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7199
2018-03-02T02:00:50Z
jag:ART
Fluid Inclusion Study Of The Polymetallic Epithermal Quartz Veins At Soripesa Prospect Area, Sumbawa Island, Indonesia
Kant, Win
Warmada, I Wayan
Idrus, Arifudin
Setijadji, Lucas Donny
Watanabe, Koichiro
The Soripesa prospect area is located at Maria village, Wawo district, Bima region in the eastern part of Sumbawa Island, Indonesia. This area is a part of Cenozoic Calc-alkaline volcanic inner Banda-Sunda Arc. The dominant lithology of Soripesa prospect area are a lithic-crystal tuff of andesitic and dacitic composition and bedded limestone. There have five main polymetallic epithermal quartz veins in the Soripesa prospect area, namely, Rini vein, Jambu air vein, Dollah vein, Merpati vein, and Arif vein. Those quartz veins are hosted mainly in andesitic volcaniclastic rocks. Fluid inclusion study on those quartz veins is vey important to know the condition of hydrothermal fluids and their origin. Fluid inclusion study is conducted at the laboratory of Earth Resources Engineering Department, Kyushu University, Japan. Homogenization temperature, freeze temperature, eutectic temperature, and melting temperature can be known from fluid inclusion study. Based on fluid inclusion study, formation temperatures of all veins are between 250–260◦C. Melting temperature is between -0.2 to -3◦C. Based on the melting temperature, salinity (wt.% NaCl equiv.) of fluid inclusions is calculated by using Bodnar’s equation. Paleodepth of formations and pressure of trapping are also estimated by using formation temperature and salinity. Based on Hass (1971) diagram, estimated paleodepths of formations are 270 m for Merpati vein, 400 m for Dollah vein, 480 m for Rini vein, 570 m for Arif vein, and 680 m for Jambu Air vein, respectively. Pressure of trapping can also be estimated from depth of formation, density of lithostatic overburden, and gravity; 72 bars for Merpati vein, 106 bars for Dollah vein, 127 bars for Rini vein, 151 bars for Arif vien, and 180 bars for Jambu Air vein, respectively. Keywords: Soripesa, polymetallic quartz veins, homogenization temperature, salinity.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7199
10.22146/jag.7199
Journal of Applied Geology; Vol 4, No 2 (2012)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7199/5638
Copyright (c) 2015 Win Kant, I Wayan Warmada, Arifudin Idrus, Lucas Donny Setijadji, Koichiro Watanabe
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7200
2018-03-02T02:01:18Z
jag:ART
Lead Contamination In Soil Of Yogyakarta City, Indonesia
Budianta, Wawan
This paper investigates on Pb concentrations and mobility in soil of overall Yogyakarta City, Indonesia. The objectives of this study include to investigate Pb concentrations in the surface soil throughout Yogyakarta and to study their possible sources and potential environmental impacts. The soil samples from 168 locations in Yogyakarta was obtained, representing different land use and traffic conditions. Spatial analysis and sequential extraction analysis were performed. Generally, contour pattern of Pb value clearly shows that high value is concentrated in the middle and few north part of the study area, confirmed by traffic condition in the study area. In general, the results of sequential extraction analysis shows that Pb was predominantly associated with exchangeable fraction. The presence of lead in the exchangeable fractions may pose a serious environmental concern since they are highly soluble and potentially bio-available in the soil of study area. Keywords: Soil, lead contamination, GIS, sequential extraction.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7200
10.22146/jag.7200
Journal of Applied Geology; Vol 4, No 2 (2012)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7200/5639
Copyright (c) 2015 Wawan Budianta
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7201
2018-03-02T02:01:48Z
jag:ART
Paleogeography And Sedimentation Dynamics Of Ujoh Bilang-Batubelah Limestone Member, Upstream Mahakam River, Ujoh Bilang Area, East Kalimantan Province
Novian, Indra
Kusuma Wijayanti, Herning Dyah
-
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7201
10.22146/jag.7201
Journal of Applied Geology; Vol 4, No 2 (2012)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7201/5640
Copyright (c) 2015 Indra Novian, Herning Dyah Kusuma Wijayanti
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7202
2018-03-02T01:44:18Z
jag:ART
SITE RESPONSE CHARACTERISTICS OF H/V SPECTRUM BY MICROTREMOR SINGLE STATION OBSERVATIONS AT PALU CITY, INDONESIA
Thein, Pyi Soe
Pramumijoyo, Subagyo
Brotopuspito, Kirbani Sri
Wilopo, Wahyu
Kiyono, Junji
Setianto, Agung
In this study, we estimated predominant period of an H/V spectrum in Palu City, Indonesia, by using microtremor single station observations. Sulawesi Island, eastern Indonesia, is located at the junction between the converging Pacific-Philippine, Indo- Australian Plates and the Eurasian Plate. One of the major structures in Central Sulawesi is the Palu- Koro Fault system, which extends NNW-SSE direction and cross-cuts Sulawesi along more than 300 km from the North Sulawesi trench passing southward through Palu Bay then turn to the southeast, connecting to the Matano and Lawanopo Faults and further eastward both faults join to Tolo trench. Several earthquakes have been known along Palu-Koro Fault system such as Gimpu earthquake (1905), Kulawi earthquake (1907), Kantewu earthquake (1934), and offshore Donggala earthquake (1968) which caused tsunami that destroyed 800 houses and killed 200 people at Donggala district. Palu City, located at the northern tip of Palu depression, is a capital of the Central Sulawesi Province. It is located in the active seismic zone of the Palu-Koro fault. Spectral ratios for horizontal and vertical motion (H/V) from single-station microtremor records were used to identify the predominant periods of the ground vi- brations. Understanding the parameters of predominant period[s] and seismichazard is important for mitigation and environmental planning of the Palu region. Keywords: H/V spectrum, predominant period[s], microtremor single station observation
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7202
10.22146/jag.7202
Journal of Applied Geology; Vol 5, No 1 (2013)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7202/5641
Copyright (c) 2015 Pyi Soe Thein, Subagyo Pramumijoyo, Kirbani Sri Brotopuspito, Wahyu Wilopo, Junji Kiyono, Agung Setianto
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7203
2018-03-02T01:46:29Z
jag:ART
GROUND MOTION IN YOGYAKARTA CITY, YOGYAKARTA SPECIAL PROVINCE, INDONESIA ON DENSELY MICROTREMOR OBSERVATIONS AND SHEAR WAVE VELOCITY
Kyaw, Zaw Lin
Pramumijoyo, Subagyo
Husein, Salahuddin
Fathani, Teuku Faisal
Kiyono, Junji
Microtremor is currently considered the foremost tool in site effect studies. The ground motion is estimated with microtremor observations, meaning that subsoil mechanical properties and geometry are evaluated and from them an estimate of local amplification is computed. Here, the ground motion is studied by the site effects of seismic hazard zonation of urban areas in Yogyakarta City. The main purpose of this paper is zoning the geological engineering features and assessing seismic of the research urban area. In this regard, the microtremors are measured at 274 sites by single station sampling method and Nakamura technique. The microtremors of all over the city are processed by a model of Mitutoyo-GPL-6A3P. The amplification factor generally ranges between 0.70 and 5.56 and the natural frequency normally varies between 0.40 and 3.30 Hz. The information layers are prepared in GMT used for detecting the zonation of potential seismic hazard. The shear wave velocity is calculated in 12 existing drilling sites based on the geotechnical approach of SPT for soil condition. To study the ground motion, geological engineering condition is investigated using amplification factor, natural frequency, shear wave velocity maps which are analyzed using densely single microtremor observation and SPT from existing drilling sites. Keywords: Ground motion, amplification factors, natural frequency; H/V spectral ratio, microtremor observations, Yogyakarta Urban
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7203
10.22146/jag.7203
Journal of Applied Geology; Vol 5, No 1 (2013)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7203/5642
Copyright (c) 2015 Zaw Lin Kyaw, Subagyo Pramumijoyo, Salahuddin Husein, Teuku Faisal Fathani, Junji Kiyono
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7204
2018-03-02T01:47:39Z
jag:ART
COMPARISON OF KRIGING AND INVERSE DISTANCE WEIGHTED (IDW) INTERPOLATION METHODS IN LINEAMENT EXTRACTION AND ANALYSIS
Setianto, Agung
Triandini, Tamia
Analysis that is based on geostatistics eliminates many corresponding defects and limitations compared to classical statistics which have been developed by random distribution theory of processes and variables. Interpolation is important for local analysis by GIS, because many maps used for GIS operation are made by interpolation. In this research, two different methods which is Kriging method and Inverse Distance Weighted (IDW) method was examined for developing Digital Elevation Model image. Each method’s advantages and disadvantages were considered. The study are, Kepil, is within Kulon Progo physiographic and stratigraphic area, located in the western part of Yogyakarta city. This area is located close to the Java Island Subduction Zone, hence influence of tectonic plate movement is relatively dominant. Geological structures become a main factor that shapes the recent morphology. This study area also has many settlements and has high weathering and erosion rate. Lineaments are extracted based on Digital Elevation Model to provide assistance in delineating geological structures. The structural geology analysis and an understanding of tectonic phase of the area provide useful information for geological map- ping. Accuracy of lineament depends on extraction and imagery parameters used. In this study, the extraction was conducted by two different raster methods, namely Kriging and Inverse Distance Weighted (IDW) with the same resolution of 30 meters. Lineament extracted automatically (digitally) with certain parameter settings. Keywords: Kriging, inverse distance weighted, interpolation, lineament, random distribution, digital elevation model.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7204
10.22146/jag.7204
Journal of Applied Geology; Vol 5, No 1 (2013)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7204/5643
Copyright (c) 2015 Agung Setianto, Tamia Triandini
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7205
2018-03-02T01:49:06Z
jag:ART
HOST ROCKS’ GEOCHEMISTRY AND MINERALIZATION POTENTIAL OF POLYMETALLIC EPITHERMAL QUARTZ VEINS AT SORIPESA PROSPECT AREA, SUMBAWA ISLAND, INDONESIA
Khant, Win
Warmada, I Wayan
Idrus, Arifudin
Setijadji, Lucas Donny
Watanabe, Koichiro
The Soripesa prospect area is located at Maria village, Wawo district, Bima region in the eastern part of Sumbawa Island, Indonesia. This area is a part of Cenozoic Calc-alkaline volcanic inner Banda- Sunda Arc. There are five main polymetallic epithermal quartz veins in the Soripesa prospect area, namely, Rini vein, Jambu air vein, Dollah vein,Merpati vein, and Arif vein. The dominant lithology is a lithic-crystal tuff of andesitic and dacitic composition and bedded limestone. Major oxides and trace elements were analyzed by using X-Ray Fluorescence (XRF) to identify the host rock geochemistry. The main veins are hosted by andesitic and andesitic/ basaltic volcanic host rocks. Major elements compositions are affected by alteration. Based on the trace element data, host rocks of all veins were formed in the volcanic arc basalt (VAB) and island arc basalt (IAB) tectonic settings. Host rocks of Rini vein contain higher amount of precious and base metal elements (Zn, Cu, Pb, and Ag.etc.) than those of other host rocks. Keywords: Soripesa prospect area, lithology, tectonic setting, mineralization.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7205
10.22146/jag.7205
Journal of Applied Geology; Vol 5, No 1 (2013)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7205/5644
Copyright (c) 2015 Win Khant, I Wayan Warmada, Arifudin Idrus, Lucas Donny Setijadji, Koichiro Watanabe
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7206
2018-03-02T01:50:23Z
jag:ART
ASSESSMENT OF OPTIMUM YIELD OF GROUNDWATER WITHDRAWAL IN THE YOGYAKARTA CITY, INDONESIA
Eka Putra, Doni Prakasa
Iqbal, Muhammad
Hendrayana, Heru
Putranto, Thomas Triadi
The high demand of clean water supply and groundwater usages in Yogyakarta City, Indonesia has caused the lowering of groundwater table of about 3 m in average since 1984. This condition is caused by the increase number of groundwater pumping in this city relate to the rising of the urban population, economics condition, education and cultural activities, change of land use and increase number of hotels on this famous tourism city in Indonesia. Therefore, it became necessary to assess the optimum yield from the groundwater system beneath this city which can still preserve the recent level of shallow groundwater. This is important because most of the people in this city depends their daily water supply from shallow dug well. In order to assess the safe yield, a groundwater modeling is conducted. The data used on this modeling was taken from previous research and also primary data collected during this research such as; aquifer geometry, aquifer characteristics, shallow groundwater level, water usage/pumping wells discharge, river discharge and surface water level, and climate data. Prediction of the impact of groundwater pumping was made by increasing the water usage/pumping wells discharge on several scenarios. The result of this modeling shows that the optimum yield of the aquifer beneath Yogyakarta City area is about 125,000 m3/day. Keywords: Optimum yield, groundwater usage, groundwater table, pumping, urban population, shallow dug well.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7206
10.22146/jag.7206
Journal of Applied Geology; Vol 5, No 1 (2013)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7206/5645
Copyright (c) 2015 Doni Prakasa Eka Putra, Muhammad Iqbal, Heru Hendrayana, Thomas Triadi Putranto
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7207
2018-03-02T01:52:43Z
jag:ART
IMPROVEMENT OF EXPANSIVE SOIL BY ELECTRO-KINETIC METHOD
Thanh Thuy, Tran Thi
Eka Putra, Doni Prakasa
Budianta, Wawan
Hazarika, Hemanta
The roadway in Karangjati, Ngawi Regency, East Java, Indonesia, which is underlain by expansive soil, is susceptible to damage due to volume change. This research aims to improve the engineering properties, such as consistency limits, compressibility, and undrained shear strength of the montmorillonite dominated soil in this area using an electrokinetic stabilization method. Four electro-kinetic experiments were conducted using different electrolytes (calcium chloride or pure water) under different conditions (no-flow or flow water). The results show that, pH values of all soil samples decreased at anolyte and increased at catholyte. Atterberg limits of the soil samples were found to increase, where the liquid limit (LL) range of 79.72– 86.14%, plastic limit (PL) 25.22–30.80%, and plasticity index (PI) 53.28–60.92, liquidity Index (LI) 0.91–1.08. The compression index Cc was 0.50– 0.742. Undrained shear strength of treated soil range of 7–11 kPa. Moreover, strengthening degree of the treated soils achieve 304–556%. The soil improvement was achieved by decreasing the Atterberg limits, and compressibility and increasing the undrained shear strength. Applying calcium chloride and flow water condition were the most effective methods for the soil improvement. The mineralogical compositions of the soil samples did not change after the treatment. Keywords: Electro-kinetic stabilization, electro chemical injection, clayey soil improvement.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7207
10.22146/jag.7207
Journal of Applied Geology; Vol 5, No 1 (2013)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7207/5646
Copyright (c) 2015 Tran Thi Thanh Thuy, Doni Prakasa Eka Putra, Wawan Budianta, Hemanta Hazarika
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7208
2018-03-02T01:41:24Z
jag:ART
Determination of suitable groundwater quality for agriculture by using GIS application in Bantul Regency, Yogyakarta Special Province, Indonesia
Kong, Chhuon
Hendrayana, Heru
Setianto, Agung
irrigation purposes within Bantul area which is located on Yogyakarta Volcanic Groundwater Basin, 47 existing data points were used complementary with the results of 30 groundwater samples analysis which were collected from dug and tub wells in various locations of study area. ECw, TDS, pH and major cations: Na+, Ca2+, Mg2+, K+,and anions: Cl, HCO 3 , SO2 4 , NO 3 were analyzed as evaluation index. The relative tendency of ion in epm shows Ca2+>K+>Na+>Mg2+ and HCO 3 >Cl>SO2 4 . Variations in groundwater composition by using Mg/Ca vs. Na/Ca molar ratio indicates that the groundwater is close to silicate rock with influence of clastic carbonate rock. Higher salinity approach to the west of the Bantul indicates that groundwater quality is controlled by clastic carbonate rock and expose limestone of Sentolo hills. Groundwater samples fall under class I suggested that groundwater is good and suitable for irrigation based on Doneen’s classification of permeability index and 78.37% is in excellent category by Wilcox classification on N%. According to the SAR values plotted in the USSL diagram, the majority of the groundwater samples belong to C2-S1 and C2-S2 class, indicating medium salinity and low sodium water which can be used for irrigation with little danger. The suitability of groundwater quality for agriculture is determined by thematic maps produced from ArcGIS Spatial Analyst based on FAO guideline. Salinity is the significant problem that has slight to moderate restriction effect on crops productivities in this area. The ECw map indicates that good groundwater quality for crops is at the middle to the east of study area close to Opak River, while at the western irrigation water is affected but yielding no reduction on rice productivity. However, it has slight to moderate restriction on sensitive crops indicated in thematic map of crops land with different yield potential. The agricultural land in which has yield potential of 100%, 90% and 75% is about 2727.90 ha (38.56%), 735.49 ha (10.39%) and 208.98 ha (2.95%) of the study area respectively. Key words: Irrigation groundwater quality, total dissolved solids (TDS), electrical conductivity (EC), evaluation index, ArcGIS Spatial Analyst, FAO guideline, yield potential.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7208
10.22146/jag.7208
Journal of Applied Geology; Vol 5, No 2 (2013)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7208/5647
Copyright (c) 2015 Chhuon Kong, Heru Hendrayana, Agung Setianto
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7209
2018-03-02T01:40:10Z
jag:ART
ESTIMATION OF THE GEOLOGICAL STRENGTH INDEX SYSTEM FOR CAVITY LIMESTONE LAYER IN QUARRY AREA, REMBANG, CENTRAL JAVA PROVINCE, INDONESIA
Wijaya, R. Andy Erwin
Karnawati, Dwikorita
Srijono, Srijono
Wilopo, Wahyu
Limestone mining needs a good mine design which is safe for the environment. Mine design is determined by the rock mass quality. The rock mass quality in each mine location is not necessary the same depending on the geological conditions. The research area is located in limestone quarry of Sale District, Rembang Regency, Center Java Province-Indonesia. In the limestone quarry area, there is cavity zone which consists of cavity limestone layer at the wall of quarry bench. This cavity layer in limestone quarry has occurred by solution process. The cavity layer zone is a potentially weak zone which has caused bench failures in the limestone quarry area. The objective of this research is to analyze the rock mass quality in the cavity limestone layer using Geological Strength Index (GSI) system. Final result of the research is a rock mass characterization, specifically for cavity limestone layer. Keywords: geological strength index, limestone, cavity layer
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7209
10.22146/jag.7209
Journal of Applied Geology; Vol 5, No 2 (2013)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7209/5648
Copyright (c) 2015 R. Andy Erwin Wijaya, Dwikorita Karnawati, Srijono Srijono, Wahyu Wilopo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7210
2018-03-02T01:38:21Z
jag:ART
DETERMINATION OF NUCLEAR POWER PLANT SITE IN WEST BANGKA BASED ON ROCK MASS RATING AND GEOLOGICAL STRENGTH INDEX
Irvani, Irvani
Wilopo, Wahyu
Karnawati, Dwikorita
Indonesian government through the National Atomic Energy Agency has planned to build a nuclear power plant. One of the proposed sites is in West Bangka Regency, Bangka Belitung Archipelago Province. The engineering geology of this area is, however, not fully understood and requires further investigations. Engineering geology investigations were carried out by assessing the rock mass quality and bearing capacity based on field observation and drilling data. The assessment was conducted using Rock Mass Rating (RMR) and Geological Strength Index (GSI) classification. The rock mass in the study area was divided into four units, namely Units of Sandstone, Granite, Mudstone and Pebbly Sandstone. The RMR and GSI values in the study area are influenced by the parameters of discontinuity space density, the slope of discontinuity orientation, grade of weathering and groundwater conditions. The assessment shows that the Granite Unit has the best quality which is shown by the average RMR value of 53 and GSI value of 66. Based on the average RMR value, the Granite Unit is estimated to have cohesion value between 0.2 and 0.3 MPa, friction angle between 25° and 35°, and allowable bearing pressure between 280 and 135 T/m2. Based on the GSI value, the Granite Unit is estimated to have uniaxial compressive strength value between 1.0465 and 183.8 MPa, tensile strength between (-0.0122) and (-5.2625) MPa, rock mass strength values between 24.5244 and 220.351 MPa, and modulus of deformation within a range of 1.73–86.68 GPa. The Granite Unit is considered to be the most appropriate location for the nuclear power plants. Keywords: Nuclear power plant foundation, geological strength index, rock mass rating, rock mass quality
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7210
10.22146/jag.7210
Journal of Applied Geology; Vol 5, No 2 (2013)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7210/5649
Copyright (c) 2015 Irvani Irvani, Wahyu Wilopo, Dwikorita Karnawati
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7211
2018-03-02T01:36:51Z
jag:ART
CHARACTERISTICS AND LIQUEFACTION OF COAL FROM WARUKIN FORMATION, TABALONG AREA, SOUTH KALIMANTAN–INDONESIA
Nursanto, Edy
Idrus, Arifudin
Amijaya, Hendra
Pramumijoyo, Subagyo
Since the coal characteristic is the main controlling factors in coal liquefaction, thus five coal seams with different coal rank from Warukin Formation in Tabalong Area, South Kalimantan have been used in this study. Three seams were low rank coal (Wara 110, Wara 120, Wara 200) while two seams were medium rank (Tutupan 210 and Paringin 712). The objectives of this study was to investigate the effect of coal rank on the rate of coal conversion factor. Coal liquefaction was conducted in an autoclave on low pressure (14.7 psi) and temperature 120°C. Experiments were designed with time intervals 30, 60 and 90 minutes, respectively. The average coal properties of seam Wara 110, Wara 120 and Wara 200 were 26.65%, 5.08%, 46.26% and 30.60% for inherent moisture, ash content, volatile matter and. fixed carbon, respectively. In contrast, coal properties for seam Tutupan 210 and Paringin 712 were 18.42%, 1.81%, 23.02% and 35.76% for inherent moisture, ash content, volatile matter and fixed carbon, respectively. The maximum yields for Wara 110, Wara 120 and Wara 200 were 48.60% (30 minutes), 51.27% (60 minutes) and 46.72% (90 minutes). In comparison, Tutupan 210 and Paringin 712 resulted maximum yields of 8.22% (30 minutes), 18.35% (60 minutes), 6.23% (90 minutes). In conclusion, low rank coal has higher yield conversion compared to medium rank coal since it has higher H/C ratio. Keywords: Coal liquefaction, low rank coal, Kalimantan.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7211
10.22146/jag.7211
Journal of Applied Geology; Vol 5, No 2 (2013)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7211/5650
Copyright (c) 2015 Edy Nursanto, Arifudin Idrus, Hendra Amijaya, Subagyo Pramumijoyo
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oai:jurnal.ugm.ac.id:article/7212
2018-03-02T01:32:31Z
jag:ART
CHEMICAL COMPOSITION AND HYDRAULIC CONNECTIVITY OF SPRINGS IN THE SOUTHERN SLOPE OF MERAPI VOLCANO
Boulom, Johnny
Eka Putra, Doni Prakasa
Wilopo, Wahyu
Springs are easily found in the southern slope of Merapi volcano, Sleman Regency, Yogyakarta Special Province, Indonesia. Springs origins on this location are commonly related to the existing of Merapi Aquifer System, but importance question of all these springs are hydraulic connectivity among them. In response to the issue, the objective of this research is to determine hydraulic connectivity of springs based on their chemical composition. To answer the objectives, measurement of spring discharge and physicochemical properties of spring’s water and sampling of selected spring’s water were conducted on this research in the study area. Water chemistry composition was classify by Kurlov formula and displayed by Fingerprint diagram and Composition diagram. Results show that the chemical compositions of most all spring samples are almost similar and does not significantly different for most properties from upstream to downstream, which are Na–Ca–HCO3 water, only one spring of Umbul Jatiningsih spring had different chemical composition of Ca–Na–Mg– HCO3 water. Based on the Fingerprint diagram and Composition diagram evaluation, the spring’s water can be differentiated into three groups. Group 1 consists of ten springs which have similar chemical composition of Na–Ca–HCO3 and with electrical conductivity ranges between 150 to 200 mS/cm. Group 2 consists only one spring “Umbul Pajangan” which contain similar chemical composition to Group 1 but has significantly higher ions concentration (EC value about 400 mS/cm) and Group 3 consists also only one spring “Umbul Jatiningsih” which has significantly different ionic composition with Group 1 and 2. Regarding on this condition, it can be concluded that Group 1 spring is hydraulically connected and relate to the shallow aquifer system of Merapi Aquifer System. In other side, water of spring “Umbul Pajangan”possibly comes from deeper aquifer system of Merapi Aquifer System and this argument is supported by the spring discharge evaluation. Finally, spring “Umbul Jatiningsih” is originate mainly from different aquifer system of porous limestone aquifer. Keywords: Merapi aquifer system, spring, chemical composition, geological condition
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7212
10.22146/jag.7212
Journal of Applied Geology; Vol 6, No 1 (2014)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7212/5651
Copyright (c) 2015 Johnny Boulom, Doni Prakasa Eka Putra, Wahyu Wilopo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7213
2018-03-02T01:30:50Z
jag:ART
WEATHERING STAGE CONTROL OF TUFF AND ITS INFLUENCE TO THE MALINO–MANIPI LANDSLIDE SUSCEPTIBILITY, SOUTH SULAWESI INDONESIA
Busthan, Busthan
Imran, A.M.
Samang, L.
Ramli, M.
In 2013 there has been 34 incidents of landslides which cut the roads linking between Gowa and Sinjai off. The purpose of this study was to determine the effect on the stage of weathering of landslide in the study area. Methods used in this study are field survey, petrographic analysis, XRD analysis and shear strength testing of rock. Field survey results indicates that the area is dominated by tuffs that are partly volcanic breccia and lava. Petrographic analysis, showing the dominant composition of tuff with volcanic glass, bitownite, pyroxene and opaque minerals, and XRD analysis results indicate weathering tuffs that have experienced high and completely weathered contain smectite and halloysite clay types, and insitu shear strength test results indicate a strong shift to the lower tuff with high stage of weathering. Keywords: Susceptability to landslides, the stage of weathering, halloysite and smectite, shear strength, roads of Malino–Manipi
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7213
10.22146/jag.7213
Journal of Applied Geology; Vol 6, No 1 (2014)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7213/5652
Copyright (c) 2015 Busthan Busthan, A.M. Imran, L. Samang, M. Ramli
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7214
2018-03-02T01:27:08Z
jag:ART
ROCK MASS RATING OF CAVITY LIMESTONE LAYER IN REMBANG, CENTRAL JAVA, INDONESIA
Wijaya, R. Andy Erwin
Karnawati, Dwikorita
Srijono, Srijono
Wilopo, Wahyu
mine design. Mine design is determined by the rock mass quality, which varies from one mine location to another, depending on the geological conditions. The research area is located in limestone quarry of Sale District, Rembang Regency, Central Java Province, Indonesia. In the study area, a cavity zone is exposed at the wall of quarry bench and occurs by a solution process. The cavity layer zone is a weak zone which has caused bench failures. The objective of this research is to evaluate the quality of the cavity limestone layer for a safe mine design using Rock Mass Rating (RMR) system. Final result of the research is a rock mass characterization, specifically for the cavity limestone layer. Keywords: Rock mass rating, limestone, cavity layer
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7214
10.22146/jag.7214
Journal of Applied Geology; Vol 6, No 1 (2014)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7214/5653
Copyright (c) 2015 R. Andy Erwin Wijaya, Dwikorita Karnawati, Srijono Srijono, Wahyu Wilopo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7215
2018-03-02T01:25:14Z
jag:ART
HIGH SULFIDATION EPITHERMAL MINERALIZATION AND ORE MINERAL ASSEMBLAGES OF CIJULANG PROSPECT, WEST JAVA, INDONESIA
Tun, Myo Min
Warmada, I Wayan
Idrus, Arifudin
Harijoko, Agung
Verdiansyah, Okki
Watanabe, Koichiro
Cijulang is a high-sulfidation epithermal system hosted in the calc-alkaline rocks of andesite lava and lapilli tuff. Mineralization in the prospect is characterized by pyrite-enargite-gold and associated acid sulfate alteration. Studies on ore and gangue mineral assemblages and their mutual textural relationships were carried out in order to explore the paragenetic sequence of mineralization. Hypogene mineralization primarily occurs in the silicic core and the advanced argillic zone in the form of massive replacement, fracture-filling veinlets, vug-filling, patches and dissemination. Mineralization is apparently controlled by both lithology and structures. Common ore minerals include pyrite, enargite, luzonite, tennantite, chalcopyrite, covellite, galena, emplectite and Te-bearing minerals. The paragenetic study indicates that the epithermal prospect evolved from an early stage of intense acid leaching resulting in the formation of vuggy silica and advantage argillic mineral assemblage which was followed by the sulfides deposition. Two metal stages were identified during ore deposition: an early Fe-As-S stage and the later Cu-Fe-As-S stage. The former stage is char- acterized high-sulfidation state sulfides such as enargite/ luzonite+covellite whereas a later stage of Cu- Fe-As–S is represented by intermediate sulfidation state sulfides assemblage of tennantite+chalcopyrite. Gold is probably introduced in the early stage within the ore system and more abundant in the late stage. Keywords: Cijulang, high-sulfidation, acid sulfate, mineralization, enargite, paragenetic, metal stages
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7215
10.22146/jag.7215
Journal of Applied Geology; Vol 6, No 1 (2014)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7215/5654
Copyright (c) 2015 Myo Min Tun, I Wayan Warmada, Arifudin Idrus, Agung Harijoko, Okki Verdiansyah, Koichiro Watanabe
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7216
2018-03-02T01:21:40Z
jag:ART
GEOCHEMICAL VARIATIONS ON HOSTED VOLCANIC ROCKS OF CIBALIUNG EPITHERMAL GOLD MINERALISATION, BANTEN – INDONESIA: IMPLICATIONS FOR DISTRIBUTION OF SUBDUCTION COMPONENTS
Titisari, Anastasia Dewi
Phillips, David
Hartono, Hartono
Subduction of the Indo-Australian Plate beneath the Eurasian Plate formed at least seven magmatic arcs in Indonesia. One of the magmatic arcs is the Neogene Sunda-Banda arc hosts various style of gold mineralisation such as Cibaliung epithermal gold mineralisation. Major and trace element data for host volcanic rocks to the Cibaliung epithermal gold mineralisation is provided by this study to identify the magmatic arc system and the distribution of subduction components. Enriched LILE (Large Ion Lithopile Element) and LREE (Light Rare Earth Element) compositions for basaltic andesite – rhyodacitic samples from the Cibaliung district are characteristic of calc-alkaline arcs. In this typical volcanic arc, the subduction component can be shown to make a dominant contribution to its content of LILE such as Rb, K, Th, and Ba enriched (more than 88%) relative to the mantle and within plate inputs. The incompatible elements (Hf, Zr, and Nb) cannot be observed in the subduction component and thus assumed to be derived from trace element enriched sub-continental lithosphere. These incompatible elements are defined as conservative elements therefore it suggests that the magma occurrence is related to a hydrous slab component. Keywords: Subduction, Indo-Australian plate, magmatic arcs, volcanic rocks, Cibaliung, epithermal gold.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7216
10.22146/jag.7216
Journal of Applied Geology; Vol 6, No 1 (2014)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7216/5655
Copyright (c) 2015 Anastasia Dewi Titisari, David Phillips, Hartono Hartono
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7217
2018-01-15T03:11:13Z
jag:ART
LANDSLIDE SUSCEPTIBILITY ASSESSMENT OF KOKAP AREA USING MULTIPLE LOGISTIC REGRESSION
Makealoun, Somyot
Eka Putra, Doni Prakasa
Wilopo, Wahyu
A number of landslides have occured in Kokap SubDistrict, Kulon Progo Regency, Yogyakarta Special Province, Indonesia, which have influenced the communities. The natural disaster is commonly associated with a few days of heavy rainfall events. To mitigate the impact of landslides in this area, a landslide susceptibility assessment needs to be carried out. The main objective of this research is to develop a landslide susceptibility zonation in the research area by applying a logistic regression (LR) method. Field observation was conducted at 68 locations in the research area, in which 46 landslides occured. Data of slope angle, lithology, geologic structure and groundwater conditions were collected. The relationship between landslide occurrence and the slope angle, lithology, geologic structure and groundwater conditions was analysed using the LR method. The analysis results showed a 0.984 standard error, implying a good-fit model. The study area was classified into very low, low, moderate, high and very high landslide susceptibility zones with 0–20%, 20–40%, 40–60%, 60–80%, and 80–100%, respectively, probabilities of occurrence. A 60% area of the total study area was classified as a moderate to very high susceptibility to landslide. From 47 landslides, 80% landslides occured in high and very high landslide susceptibility zones, 17% landslides occured in the moderate susceptibility zone and 2% landslides occured in the low susceptible zone. None of landslides occured in the very low landslide susceptibility zone. The analysis results show that LR method is a very useful method for landslide prediction. Keywords: landslide susceptibility, multiple logistic regression, Kokap Kulon Progo-Indonesia
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7217
10.22146/jag.7217
Journal of Applied Geology; Vol 6, No 2 (2014)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7217/5656
Copyright (c) 2015 Somyot Makealoun, Doni Prakasa Eka Putra, Wahyu Wilopo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7218
2018-01-15T03:14:09Z
jag:ART
FLUID INCLUSION STUDIES OF THE EPITHERMAL QUARTZ VEINS FROM SUALAN PROSPECT, WEST JAVA, INDONESIA
Tun, Myo Min
Warmada, I Wayan
Idrus, Arifudin
Harijoko, Agung
Verdiansyah, Okki
Watanabe, Koichiro
Sualan prospect is located at Talegong Sub-district of Garut Regency, West Java, Indonesia. The area constitutes calc-alkaline volcanic and volcaniclastic rocks of Tertiary age. The rocks have experienced regional propylitic and argillic alteration. Fluid inclusions from quartz veins were studied in order to constrain the nature, characteristics and evolution of fluids. Microthermometric measurements on fluid inclusion were carried out by freezing and heating experiment. Temperatures of homogenization (Th) and final melting of ice (Tm) were measured for primary, liquid-dominated, two-phase inclusions. The values of Th range from 160°C to 210°C and salinities range from 0.35 to 4.96 wt.% NaCl equiv. Formation temperature of the quartz veins are estimated at 180°C and 190°C and paleo-depth of formation are at 80m and 140m, respectively. Microthermometric data indicates that fluid mixing and dilution were important processes during the evolution of hydrothermal system. Based on fluid inclusion types, microthermometric data, trapping temperature, paleo-depth, texture of quartz and hydrothermal alteration types, quartz veins from prospect were developed under epithermal environment. Keywords: Quartz vein, fluid inclusions, microthermometry, salinities, formation temperature, paleo-depth, epithermal, Sualan prospect.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7218
10.22146/jag.7218
Journal of Applied Geology; Vol 6, No 2 (2014)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7218/5657
Copyright (c) 2015 Myo Min Tun, I Wayan Warmada, Arifudin Idrus, Agung Harijoko, Okki Verdiansyah, Koichiro Watanabe
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7219
2018-01-15T03:17:12Z
jag:ART
METAMORPHIC EVOLUTION OF GARNET–BIOTITE–MUSCOVITE SCHIST FROM BARRU COMPLEX IN SOUTH SULAWESI, INDONESIA
Setiawan, Nugroho Imam
Osanai, Yasuhito
Nakano, Nobuhiko
Adachi, Tatsuro
This paper explains the first report in metamorphic evolution of pelitic schist from Barru Complex in South Sulawesi, Indonesia. Garnet-biotitemuscovite schist was examined petrologically to assess the metamorphic evolution history, which has implications on tectonic condition of this region. The rock mainly composed of garnet, biotite, muscovite, epidote, quartz, rutile, hematite, and plagioclase. Inclusions in the garnet preserve records of prograde stage of this rock, which are epidote, titanite, quartz, and apatite. Garnet, biotite, muscovite, quartz, rutile, and plagioclase are concluded as equilibrium assemblages at peak P-T condition of this rock, which estimated at 501–562 ºC and 0.89–0.97 GPa. The result is still on the ranges of the estimated geothermal gradient P-T path of eclogite from Bantimala Complex. Similar geothermal gradients of metamorphisms might be indicated that these metamorphic rocks were metamorphosed on the similar tectonic environments. Keywords: Pelitic schist, Barru Complex, South Sulawesi, metamorphic evolution.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7219
10.22146/jag.7219
Journal of Applied Geology; Vol 6, No 2 (2014)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7219/5658
Copyright (c) 2015 Nugroho Imam Setiawan, Yasuhito Osanai, Nobuhiko Nakano, Tatsuro Adachi
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7220
2018-01-15T03:19:50Z
jag:ART
AN EVALUATION OF ROCK SLOPE STABILITY USING LIMIT EQUILIBRIUM ANALYSES
Aprilia, Faridha
Indrawan, I Gde Budi
The stability of rock slopes is controlled by several factors, such as the intact rock strength, discontinuity characteristics, groundwater condition, and slope geometry. Limit equilibrium (LE) analyses have been commonly used in geotechnical practice to evaluate the stability of rock slopes. A number of methods of LE analyses, ranging from simple to sophisticated methods, have been developed. This paper presents stability analyses of rock slopes at the Batu Hijau open mine in Sumbawa Barat using various methods of LE analyses. The LE analyses were conducted at three cross sections of the northern wall of the open mine using the Bishop Simplified, Janbu Simplified, Janbu Generalised, and General Limit Equilibrium (GLE) methods in Slide slope stability package. In addition, a Plane Failure (PF) analysis was performed manually. Shear strength data of the discontinuity planes used in the LE analyses were obtained from back analyses of previous rock slope failures. The LE analysis results showed that the rock slopes were likely to have shallow non-circular critical failure surfaces. The factor of safety (Fs) values obtained from the Bishop Simplified, Janbu Simplified, Janbu Generalised, and GLE methods were found to be similar, while the Fs values obtained from the PF method were higher than those obtained from the more rigorous methods. Keywords: Batu Hijau mine, Bishop Simplified, Janbu Simplified, Janbu Generalised, limit equilibrium analyses, general limit equilibrium, rock slope stability, plane failure.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7220
10.22146/jag.7220
Journal of Applied Geology; Vol 6, No 2 (2014)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7220/5659
Copyright (c) 2015 Faridha Aprilia, I Gde Budi Indrawan
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7221
2018-01-15T03:24:56Z
jag:ART
DYNAMIC MORPHOLOGICAL CHANGES OF SPIT IN APRIL–MAY 2014 IN OPAK RIVER MOUTH, BANTUL, DAERAH ISTIMEWA YOGYAKARTA
Freski, Yan Restu
Setianto, Agung
Srijono, Srijono
As an oceanic coast, the beaches in the southern part of Java Island are predominantly influenced by ocean energy which is driven by periodical monsoon. This periodical process impacts the dynamic changes of spit in the river mouth system. Therefore, spit is a key to study the process in the southern coast of Java Island especially in Opak River Mouth. It needs a deep-root explanation about the morphological changes and the sedimentological mechanism. This research project was built by data such as spit geometry, aerial photographs and spontaneous wind direction. The supporting data included multitemporal IKONOS-Quickbird images from Google Earth and aerial photographs. These data were collected from field-work investigation and laboratorywork. The spit geometry was compiled by Global Positioning System handheld tracking along the edge of spit and crosschecked by aerial photograph using pole. The ultimate interpretation and periodic models were built by data reconstruction based on the geometry of spit and spontaneous wind direction. Spit changed weekly due to monsoon transition in April to May 2014. The morphological changes could be noted as the spit starting to be cut off by the highrate flow of Opak River. The process continued until the net drift moving westward. Keywords: April, coast, May, Opak river mouth, spit.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7221
10.22146/jag.7221
Journal of Applied Geology; Vol 6, No 2 (2014)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7221/5660
Copyright (c) 2015 Yan Restu Freski, Agung Setianto, Srijono Srijono
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7222
2018-01-15T03:27:12Z
jag:ART
ESTIMATION OF SUBSURFACE STRUCTURE BASED ON MICROTREMOR, BORE HOLE OBSERVATIONS AND STOCHASTIC STRONG GROUND MOTION SIMULATIONS IN PALU CITY, CENTRAL SULAWESI, INDONESIA: A VALIDATION AND SENSITIVITY STUDY ON THE 23 JANUARY 2005 (PALU) EARTHQUAKE
Thein, Pyi Soe
Pramumijoyo, Subagyo
Wilopo, Wahyu
Setianto, Agung
Brotopuspito, Kirbani Sri
Kiyono, Junji
In this study, we investigated the subsurface structure and strong ground motion parameters for Palu City. One of the major structures in Central Sulawesi is the Palu-Koro Fault system. Several powerful earthquakes have struck along the Palu-Koro Fault during recent years, one of the largest of which was an M 6.3 event that occurred on January 23, 2005 and caused several casualties. Following the event, we conducted a microtremor survey to estimate the shaking intensity distribution during the earthquake. From this survey we produced a map of the peak ground acceleration, velocity and ground shear strain in Palu City. We performed single observations of microtremors at 151 sites in Palu City. The results enabled us to estimate the site-dependent shaking characteristics of earthquake ground motion. We also conducted 8-site microtremor array investigation to gain a representative determination of the soil condition of subsurface structures in Palu. From the dispersion curve of array observations, the central business district of Palu corresponds to relatively soil condition with Vs ≤ 300 m/s, the predominant periods due to horizontal vertical ratios (HVSRs) are in the range of 0.4 to 1.8 s and the resonant frequency are in the range of 0.7 to 3.3 Hz. Three boreholes were throughout the basin especially in Palu area to evaluate the geotechnical properties of subsurface soil layers. The depths are varying from 1 m to 30 m. Strong ground motions of the Palu area were predicted based on the empirical stochastic green’s function method. Peak ground acceleration and peak ground velocity becomes more than 0.04 g and 30 kine in some areas, which causes severe damage for buildings in high probability. Keywords: Palu-Koro fault, microtremor, bore holes, peak ground acceleration and velocity.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7222
10.22146/jag.7222
Journal of Applied Geology; Vol 6, No 2 (2014)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7222/5661
Copyright (c) 2015 Pyi Soe Thein, Subagyo Pramumijoyo, Wahyu Wilopo, Agung Setianto, Kirbani Sri Brotopuspito, Junji Kiyono
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7223
2015-09-01T23:53:07Z
jag:ART
PRELIMINARY EVALUATION OF LOCAL SITE CONDITON IN YOGYAKARTA BASIN
Naing, Tun
Pramumijoyo, Subagyo
Kawase, Hiroshi
The Yogyakarta Basin can be defined as NE – SW elongated depression zone of 20 km in width and 45 km in length, trending from Yogyakarta City in north to the Indian Ocean in south. The local geologic and soil conditions have a great influence on the intensity of ground motion and earthquake damage. Local site effects play an important role in earthquake-resistant design and must be accounted for on a case by case basis. Local site conditions can profoundly influence all of the important characteristics such as amplitude (peak acceleration, velocity and displacement), frequency content and duration of strong ground motion. The extent of their influence depends on the geometry and material properties of subsurface materials. Therefore, subsurface investigation was carried out through nine boreholes throughout the basin. Based on drill-logs, collected samples and laboratory test results, the subsurface soil profiles of nine areas in the basin are simplified for future strong ground motion simulation. Five subsurface layers in Tampuran, Krajan areas and six subsurface soil layers in Watu, Jl. Parangtritis, Wijirejo areas and seven layers in Jl. Parangtritis, Karang Semut, Bambang Lipuro areas and eight layers in Pranti area, have been simplified and the geotechnical properties of each layer have been evaluated as well.
Keywords: Basin, Yogyakarta, depression, ground motion, earthquake.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7223
10.22146/jag.7223
Journal of Applied Geology; Vol 1, No 1 (2009)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7223/5662
Copyright (c) 2015 Tun Naing, Subagyo Pramumijoyo, Hiroshi Kawase
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oai:jurnal.ugm.ac.id:article/7224
2015-09-01T23:55:00Z
jag:ART
GEOLOGICAL CONSIDERATION FOR CO2 STORAGE IN INDONESIA: A BASINAL SCALE OUTLOOK
Amijaya, Hendra
Carbon dioxide capture and storage (CSS) is alternative of reducing atmospheric emissions of CO2. The concepts of CO2 storage refer to the injection of carbon dioxide in dense form into aquifers, which basically must meet several conditions. Three types of geological formations that can be used for the geological storage of CO2 are oil and gas reservoirs, deep saline formations and unmineable coal beds. Indonesia has 60 Tertiary basins, however that great precautions must be taken for selecting particular sedimentary basin in Indonesia for carbon dioxide storage because of high possibility of leakage and the need to find deep formations as CO2 host since the geothermal gradient is high. One possibility to find proper basins is by selected “mature” basin as the detailed geological conditions are well known. Candidates are are North East Java or South Sumatra Basins.
Keywords: Carbon dioxide capture, storage, emission, basin.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7224
10.22146/jag.7224
Journal of Applied Geology; Vol 1, No 1 (2009)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7224/5663
Copyright (c) 2015 Hendra Amijaya
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7225
2015-09-01T23:56:49Z
jag:ART
OVERVIEW OF DEEP GEOLOGICAL CO2 STORAGE AND ITS AREA SELECTION METHOD
Setijadji, Lucas Donny
Geological sequestration of CO2 inside deep geologic formations is revolutionary among several other initiatives to combat the global warming. This method is already approved globally as a reliable and likely to be the only option that will allow removing CO2 in large enough quantities over short enough times to make a real difference. The first step of any geological CO2 storage projects is to select appropriate sedimentary basins in which CO2 will be injected and stored temporarily or permanently within permeable geological layers. The criteria for site selection methods are here explained based on summary from stateof-the-art research findings now exist. This method is planned to be applied for a more detailed mapping of potential sedimentary basins in Indonesia and neighboring regions.
Keywords: Sequestration, sedimentary basin, geological layers.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7225
10.22146/jag.7225
Journal of Applied Geology; Vol 1, No 1 (2009)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7225/5664
Copyright (c) 2015 Lucas Donny Setijadji
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7226
2015-09-02T00:00:54Z
jag:ART
SUMMARY OF RESEARCH WORK ON THE EVALUATION ON LONG TERM STABILITY OF ARTIFICIAL SLOPE PROTECTION
Soty, Ros
Karnawati, Dwikorita
Aoki, Kenji
Application of GPR, RedExplorer1.4 and GeoStudio2004 have been used to evaluate the overall stability condition of a steep slope along Kalibawang irrigation channel km 8.5, Kulon Progo Regency, Yogyakarta Special Province, Indonesia, that this slope slid down in 1990 and was restabilized by cut to be gentler and covered by shotcrete. Topographic map and engineering geological map in scale 1:2000 have been established prior to the detail investigation. Three drilling logs with in-situ test, SPT and CPT, and samplings have been made and sent to soil mechanic laboratory for index properties tests, and a slope profile along the main axe will be also created for stability analysis through GeoStudio2004. Moreover, GPR has been used to run on a full slope surface to detect the distribution of fractures and/or cavities behind the shotcrete and the results have been interpreted by the aid of RedExplorer1.4.Three profiles showing the rate and depth of fractures and/or cavities are established whereas the slope stability analysis through GeoStudio2004 is the next target of the research. The author is expecting the result from the integration of GPR interpretation and GeoStudio2004 to figure out the overall stability with respect to its existing conditions and its own geometry.
Keywords: GPR, GeoStudio2004, overall stability, fracture and/or cavities.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7226
10.22146/jag.7226
Journal of Applied Geology; Vol 1, No 2 (2009)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7226/5665
Copyright (c) 2015 Ros Soty, Dwikorita Karnawati, Kenji Aoki
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7227
2015-09-02T00:06:03Z
jag:ART
THE OCCURRENCE OF PALAEOZOIC CONGLOMERATIC ROCKS IN EAST JOHOR, PENINSULAR MALAYSIA
Surjono, Sugeng Sapto
Leman, Mohd Shafeea
Mohamed, Kamal Roslan
Ali, Che Aziz
Conglomeratic rocks in East Johor are found in the separately three formations that are the Murau, Tanjung Leman and Linggiu Formations. The Murau Formation is characterized by cobble to boulder grained breccia with very angular to angular and disorganized clasts. It was deposited by fan-delta system in the sub-aerial to shallow marine environment. The Tanjung Leman Formation consists of pebble to cobble grained conglomerate with rounded to subrounded and organized clasts. It was deposited by braided river system in the sub-aerial environment. Both formations outcropped in eastern coastal of Johor. The rudaceous rocks of the Linggiu Formation consist of pebble to cobble-sized clasts with sub angular and disorganized texture. It present as subordinate rocks within sandstone dominant in the central part of East Johor and was deposited by debris flows in the shallow marine environment. All these rudaceous rocks were interpreted as Palaeozoic in age ranging from Late Carboniferous to Late Permian. Those rudaceous rocks indicated that since Late Carboniferous, palaeogeography of East Johor was a continent with subaerial to shallow marine depositional environment.
Keywords: Conglomerate, Palaeozoic, East Johor, subaerial, shallow marine.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7227
10.22146/jag.7227
Journal of Applied Geology; Vol 1, No 2 (2009)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7227/5666
Copyright (c) 2015 Sugeng Sapto Surjono, Mohd Shafeea Leman, Kamal Roslan Mohamed, Che Aziz Ali
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7228
2015-09-02T00:08:18Z
jag:ART
ESTIMATION OF S-WAVE VELOCITY STRUCTURES IN YOGYAKARTA BASIN, INDONESIA
Naing, Tun
Pramumijoyo, Subagyo
Kawase, Hiroshi
For the theoretical simulation or prediction of strong ground motion, it is prime importance to get information of underground structures, especially for sedimentary layers overlying on bedrock, like in Yogyakarta Basin. The Standard Penetration Test, Spectral Analysis of Surface Wave (SASW) and other geotechnical properties are used to estimate S–wave velocity structures in this basin. SPT tests were conducted at nine sites and SASW measurements were performed at seventeen sites. As a result, the S-wave velocity structures of top 30 m depth had been evaluated in each site. The average shear wave velocity v30 s had been successful estimated and the sites are classified into three types; soft soil, medium dense soil and hard soil. All sites where SPT performed are on soft soil according to their v30 s . However, according to v30 s from SASW measurements, 10 sites are located on medium dense soils type, 5 sites on dense soils and 2 sites on soft soils. The acceptable equivalent S-wave velocitystructure is observed by comparing the results from SASW and geotechnical approach in Imogiri, Bambang Lipuro, Pundong (Watu, Pranti) and Pandak (Wijirejo) areas.
Keywords: Ground motion, underground structure, sedimentary layer, SPT, SASW, Pundong
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7228
10.22146/jag.7228
Journal of Applied Geology; Vol 1, No 2 (2009)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7228/5667
Copyright (c) 2015 Tun Naing, Subagyo Pramumijoyo, Hiroshi Kawase
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7229
2015-09-02T00:18:33Z
jag:ART
MODIFIED NATURAL ZEOLITE AND BENTONITE AS ADSORBENTS OF HEAVY METAL IONS FROM POLLUTED GROUNDWATER IN YOGYAKARTA URBAN ARE, INDONESIA
Pich, Bunchoeun
Warmada, I Wayan
Hendrayana, Heru
Yoneda, Tetsuro
Groundwater quality in Yogyakarta city has become the major concern due to the presence of heavy metals originated from batik home industries, slaughterhouses, and leather factories, especially in shallow groundwater. In response to the above problems, the naturally abundant zeolite and bentonite in Sidomulyo and Bandung areas were respectively sampled along with the metal-containing groundwater in Yogyakarta urban area for batch adsorption experiment. Before put into experiment, the zeolite and bentonite were characteristically investigated by means of XRD, SEM, chemical composition, and physical property analyses. Also, they were thermally activated to improve their qualities in terms of increase in CEC, whereas the groundwater was analyzed for heavy metal concentrations (Cd, Cr, Cu, Fe, Zn) and its physical property. Five logarithmic amounts of this modified zeolite or bentonite were separately and incrementally introduced into the same three solutions of heavy metals. After the experiment, all the solutions were re-analyzed for the rest of heavy metals to figure out the optimum adsorption capacity of zeolite and bentonite. The outcomes of this experiment will be beneficial in enhancing the groundwater quality for consumptions in Yogyakarta city as well as other places in Indonesia, and will also imply the zeolite and bentonite in commercialization.
Keywords: zeolite, bentonite, groundwater, heavy metal, adsorption
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7229
10.22146/jag.7229
Journal of Applied Geology; Vol 2, No 1 (2010)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7229/5669
Copyright (c) 2015 Bunchoeun Pich, I Wayan Warmada, Heru Hendrayana, Tetsuro Yoneda
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7230
2015-09-02T00:21:24Z
jag:ART
ESTIMATION, REALITY AND TREND OF GROUNDWATER NITRATE CONCENTRATION UNDER UNSEWERED AREA OF YOGYAKARTA CITY – INDONESIA
Eka Putra, Doni Prakasa
In the last two decades, urbanization has transformed Yogyakarta City expanding beyond its administrative area with about one million inhabitants. The City sited on shallow unconfined aquifer has rapidly changed without appropriate access to sanitation and piped water supply. Until now, only 9% of the urban population is served by sewers system and less than 30% of urban population have access to clean water which supplied by the local public water-work. Most of the urban population depend on shallow groundwater for much of their water supply. Regards to the massive used of on-site sanitation systems in the city, contamination of nitrate in shallow groundwater is predicted to occur and surveys of domestic dug wells have revealed a widespread nitrate contamination of the groundwater. Comparison of groundwater nitrate and chloride concentration from several old data and the latest data shows clearly an evidence of the increasing of nitrate concentration and nitrate leaching in the shallow groundwater under Yogyakarta City overtime. Considering the trend, it is no doubt that most of nitrate concentration under urbanized area in the Yogyakarta City will be greater than 50 mg/L in the next several years, if appropriate management action to deal with the on-site sanitation system is not conducted.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7230
10.22146/jag.7230
Journal of Applied Geology; Vol 2, No 1 (2010)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7230/5670
Copyright (c) 2015 Doni Prakasa Eka Putra
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7231
2015-09-02T00:24:21Z
jag:ART
ESTIMATION OF MAXIMUM EARTHQUAKE MAGNITUDE OF EARTHQUAKE POTENTIALS FOR YOGYAKARTA DEPRESSION AREA, INDONESIA
Thant, Myo
Pramumijoyo, Subagyo
Hendrayana, Heru
Kawase, Hiroshi
Adi, Agus Darmawan
Maximum magnitudes of earthquake potentials are estimated for Yogyakarta depression area by using the faultlength and earthquake magnitude relations for fault specific seismic sources. For estimation of maximum earthquake magnitude, the fault specific seismic sources are modeled as 18 normal faults and 6 strike-slip faults sources referring the geological map of McDonald, 1984 and Rihardjo et al., 1995. For the present area the subduction zone earthquakes are expected to happen in the offshore region regarding the study on the seismicity of the region and the focal mechanisms of the past earthquakes. So three area sources are also assumed for this region and the possible maximum earthquake magnitudes for these sources are determined by probabilistic approaches.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7231
10.22146/jag.7231
Journal of Applied Geology; Vol 2, No 1 (2010)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7231/5671
Copyright (c) 2015 Myo Thant, Subagyo Pramumijoyo, Heru Hendrayana, Hiroshi Kawase, Agus Darmawan Adi
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7232
2015-09-02T00:27:41Z
jag:ART
CHARACTERIZATION OF JULY 17, 2006 TSUNAMIITE AT SOUTH COAST OF WEST JAVA
Amijaya∗, Hendra
Ngisomuddin, Ngisomuddin
Akmaluddin, Akmaluddin
July 17, 2006 tsunami which occurred in Indian Ocean had swept most of the south coast of Java, especially at Pangandaran area, West Java. The tsunami wave transported and deposited sediment known as tsunamiite, with various compositions. Three different textural characteristics have been recognized on the tsunami sediment deposit. First type is on the tsunamiite found at West Pangandaran Beach, which is darker than the older beach sediment and separated by erosional surface. The sedimentary structures are parallel lamination and current ripple. The grains have no fining trend in vertical as well as lateral direction. Whereas the second type is found at East Pangandaran Beach, which is brighter than the older beach sediment and also separated by erosional surface. The sedimentary structures are cross lamination on the lower layer, parallel lamination on the middle layer and massif on the upper layer. The grains have no fining trend in vertical and lateral direction Benthic foraminifera is one of organism which is transported and deposited as tsunami deposit on the coast. Ammonia beccarii, Elphidium advenum, Amphistegina lessonii, Cibicides sp., Biginerina irregularis, Bolivina plicata, Bathysiphon sp., Nodosaria andQuinqueloculina were found in the recent tsunami deposit from Pangandaran. Based on the benthic foraminifera contents, it can be inferred that the sediments came from lagoonal until deep sea (abyssal) environment.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7232
10.22146/jag.7232
Journal of Applied Geology; Vol 2, No 1 (2010)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7232/5672
Copyright (c) 2015 Hendra Amijaya∗, Ngisomuddin Ngisomuddin, Akmaluddin Akmaluddin
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oai:jurnal.ugm.ac.id:article/7233
2015-09-02T00:30:04Z
jag:ART
JATIBARANG LANDFILL OF SEMARANG CITY: IS IT POTENTIAL AS THE WATER CONTAMINATION SOURCE?
Hendrayana, Heru
Eka Putra, Doni Prakasa
T. Putranto, Thomas
Xaixongdeth, Ponhalath
Like other million inhabitants Cities, Semarang which is the capital city of Central Java Province in Indonesia has a problem in solid waste management. One biggest landfill in the City is the Jatibarang Landfill. The landfill operated since 1992 and currently receives the domestic waste of about 337 ton/day with total volume of about 5.2 million m3 of solid waste. It located on the hill slope of sandstone tertiary rocks and relatively closed to the river of Kreo (which is the main source of drinking water for Semarang City). In order to evaluate the potentiality of landfill as the contamination source to groundwater and surface water, the quality of leachates were analyzed and the hydrogeology of the area was re-studied. Result of the study show that the leachates contain high chloride concentration of about 2600 mg/L however low concentration of heavymetals. Hydrogeology study show evidence that this leachate is already enters the groundwater system. However its load to the river can be neglected due to the fact that the chloride mass flux derived from the study area was significantly low comparing to the net river loads.
Key Word: landfill, water contamination, chloride, groundwater and surface water interaction
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7233
10.22146/jag.7233
Journal of Applied Geology; Vol 2, No 1 (2010)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7233/5673
Copyright (c) 2015 Heru Hendrayana, Doni Prakasa Eka Putra, Thomas T. Putranto, Ponhalath Xaixongdeth
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7234
2015-09-02T00:32:58Z
jag:ART
GEORADAR INVESTIGATION AT THE KEDULAN TEMPLE EXCAVATION SITE, KALASAN, YOGYAKARTA
Husein, Salahuddin
Samodra, Saptono Budi
Pramumijoyo, Subagyo
Astuti, Wahyu
Kedulan Site is the buried and ruined 9th century Mataram Hindu Kingdom temple, located in Tirtomartani Village, Kalasan District, Sleman Regency, Yogyakarta Special Province. This temple was incidentally discovered by sand diggers on 24 November 1993 under several meter thick of fluvio-volcanic deposit of the modern Merapi. Several technical studies were needed to carefully excavate the temple, including geology and geophysical approaches. One of the geophysical method have been applied was ground penetration radar (georadar). This method uses radar technology to obtain a continuous profile of the shallow sub-surface and thus allows scientists to image soil substratums based on differing dielectric constants. Georadar investigation by Department of Geological Engineering, Faculty of Engineering, Universitas Gadjah Mada, was conducted on 4 December 2007. The main purpose was to identify the location of the outer stone fence as an estimation to define the temple site area to be excavated. About one line was chosen to cross the site in north-south direction in a distance of 328 m. Two runs were completed on the same line but different courses, i.e. forward and backward, where one was checked with another. The result indicates the presence of the outer stone fence was possibly buried in a depth of 7 m. It was located about 40 m distance outside the inner stone fence. Assuming the fences were quadrangle relative to the main temple, hence it is estimated that the site area to be excavated is about 13.830 m² and total 96.808 m³ gravels and sands to be removed.
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7234
10.22146/jag.7234
Journal of Applied Geology; Vol 2, No 1 (2010)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7234/5674
Copyright (c) 2015 Salahuddin Husein, Saptono Budi Samodra, Subagyo Pramumijoyo, Wahyu Astuti
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7235
2015-09-02T00:37:36Z
jag:ART
MERCURY AND ARSENIC CONTAMINATION FROM SMALL SCALE GOLD MINING ACTIVITIES AT SELOGIRI AREA, CENTRAL JAVA, INDONESIA
Harijoko, Agung
Htun, Tin May
Saputra, Rodhie
Warmada, I Wayan
Setijadji, Lucas Donny
Imai, Akira
Watanabe, Koichiro
Small scale gold mines discussed here are located at Selogiri area, Central Java, Indonesia which was mined by local community mainly during gold rush in 1990s. This Selogiri gold deposit genetically is characterized by porphyry mineralization overprinted by epithermal system. The ore minerals assemblage consists of pyrite, sphalerite, chalcopyrite, galena, chalcocite and rare arsenopyrite.
Chemical analysis of soil and stream sediment sampled over 1.5 km across at the Selogiri gold extraction site indicates that the site has been contaminated with mercury due to mining activities. The mercury concentrations in soil and stream sediments collected during dry season range from 0.01 to 481 ppm and 0.01 to 139 ppm, respectively, higher than background value of 0.05 ppm. In contrast, mercury concentration in stream sediments collected during rainy season from the same location as dry season sampling ranges from 0.01 to 13.42 ppm, and one sample has anomalous value of 331 ppm. This result show that rain water may disperse and decrease mercury concentration in stream sediments.
In case of arsenic, although the ore contains rare arsenic minerals, arsenic concentration in bulk rock and ore is high ranging from 8 to 59 ppm, while the arsenic concentration in tailing is much higher ranging from 5.8 to 385 ppm. Chemical analyses on pyrite reveal that the pyrite grains contain arsenic and might be the source of arsenic in Selogiri mine site. However, analysis of dug-well water demonstrates that the mercury and arsenic content is still lower than the maximum allowable concentration.
Keywords: Mercury, arsenic, contamination, Selogiri, gold mine
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7235
10.22146/jag.7235
Journal of Applied Geology; Vol 2, No 1 (2010)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7235/5675
Copyright (c) 2015 Agung Harijoko, Tin May Htun, Rodhie Saputra, I Wayan Warmada, Lucas Donny Setijadji, Akira Imai, Koichiro Watanabe
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7236
2015-09-02T00:39:30Z
jag:ART
CHATODOLUMINESCENCE MICROSCOPIC ANALYSIS TO INTERPRET THE REDOX CONDITION DURING THE FORMATION OF CARBONATE VEIN
Warmada, I Wayan
Hartati, Retno
Cathodoluminescence (CL) is generated by an electron gun coupled to an optical microscope. There are two types of chatodoluminescence, i.e., cold CL and hot CL. In the cold cathode microscopic equipment, the electrons are generated by an electric discharge between two electrodes under a low gas pressure, whereas in the hot CL microscope, the electrons are generated by heating a filament (2000–3000°C). In this paper we utilize cold CL combine with electron microprobe analysis (EMPA). The CL microscopy of carbonate shows at least three carbonate generations, i.e., rhodochrosite with dull or no luminescence, Mg-rich calcite with dark red luminescence, manganese-bearing calcite with up to 0.04 wt.% Mn with bright orange luminescence, and pure calcite and Mn-rich calcite (> 0.15 wt.% Mn) with dull or no luminescence. The result also suggests that the luminescence pattern of calcite is controlled by the amount of Mn2+. Sectoral zoning and chevron-shape growth zoning exist in some coarse-grained calcite aggregates. The sectorial zoning of calcite as reflected by dull to bright CL color indicated that slightly to more reducing environment during calcite deposition.
Keywords: Chatodoluminescence, rhodochrosite, calcite, sectorial zoning
Geological Engineering Department Universitas Gadjah Mada
2015-09-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7236
10.22146/jag.7236
Journal of Applied Geology; Vol 2, No 1 (2010)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7236/5676
Copyright (c) 2015 I Wayan Warmada, Retno Hartati
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7249
2015-09-05T02:35:42Z
jag:ART
Evaluation of strong ground motion for Yogyakarta depression area, Indonesia
Thant, Myo
Pramumijoyo, Subagyo
Hendrayana, Heru
Kawase, Hiroshi
Adi, Agus Darmawan
The probabilistic seismic hazard maps are developed for Yogyakarta depression area. The earthquake catalog of ANSS (1970-2007) is taken into account with the complement of NEIC (USGS, 1973-2007) and the records of BMG (2000-2004). On the basis of seismicity of the area, tectonics and geological information, the seismic source zones are characterized for this area. The seismicity parameters of each seismic source are determined by applying the classical Gutenberg-Richter recurrence model, regarding the historical records. The attenuation relation for Yogyakarta depression area cannot be evaluated since the sufficient strong ground motion records are not available for this region. Therefore the attenuation relations which were developed for other territories as Europe and Japan are used for the present hazard calculation by validating, using the aftershocks records, modeling the peak ground acceleration maps for the recent event, 27 May, 2006, Yogyakarta earthquake inserting the damage area distribution pattern. The probabilistic seismic hazard maps are finally developed by using the McGuire (1976) EQRISK computer program by modifying for the present purpose. The seismic hazard maps expressed in term of peak ground acceleration are developed for the recurrence intervals of 10, 50, 100, 200 and 500 years
Geological Engineering Department Universitas Gadjah Mada
2015-09-05
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7249
10.22146/jag.7249
Journal of Applied Geology; Vol 2, No 2 (2010)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7249/5683
Copyright (c) 2015 Myo Thant, Subagyo Pramumijoyo, Heru Hendrayana, Hiroshi Kawase, Agus Darmawan Adi
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7250
2015-09-05T02:41:28Z
jag:ART
APPLICATION OF PFC 3D FOR SLOPE MOVEMENT ON COLLUVIAL SOIL
Tu, Nguyen Dinh
Aoki, Kenji
In the mountainous area of the tropics, soil creep often occurs on residual soil and colluvial deposit. The rate of this phenomenon varies from very slow to extremely slow and is difficult to detect without equipment as well as model. Within PFC3D (Particle Flow Code in three dimensions) granular materials such as soils are simulated by balls. And the PFC3D model was applied for colluvial soil creep. Although existing of some limitations, this application determined direction of creeping as well as zone of creeping of culluvial soil.
Geological Engineering Department Universitas Gadjah Mada
2015-09-05
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7250
10.22146/jag.7250
Journal of Applied Geology; Vol 2, No 2 (2010)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7250/5684
Copyright (c) 2015 Nguyen Dinh Tu, Kenji Aoki
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7251
2015-09-05T02:44:37Z
jag:ART
PALEOSTRESS ANALYSIS TO INTERPRET THE LANDSLIDE MECHANISM: A CASE STUDY IN PARANGTRITIS, YOGYAKARTA
Husein, Salahuddin
Sudarno, Ignatius
Pramumijoyo, Subagyo
Karnawati, Dwikorita
Paleostress analysis on the landslide boundary faults is able to explain the sliding mechanism. This method is particularly useful to study a paleolandslide. About 30 striated fault planes from the Parangtritis paleo-landslide, located in the Yogyakarta coastline, were analyzed to define their principle stress axes. The eastern boundary fault, named as the Girijati Fault, was the main fault responsible for the mass movement and leaving a considerable steep cliff. It moved normal in a left lateral sense with ENE – WSW extension and dragged the rockmass southward, creating a NNW – SSW extension along the Parangtritis Fault and turn it into the western boundary fault. The rockmass slided along the stratigraphic contact between the underlying Nglanggran Formation and the overlying Wonosari Formation, created a semi-circular crown cliff as the northern boundary and produced some isolated topographic highs of the thrust block near the toe.
Keywords: Paleostress, landslide boundary, fault, paleolandslide
Geological Engineering Department Universitas Gadjah Mada
2015-09-05
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7251
10.22146/jag.7251
Journal of Applied Geology; Vol 2, No 2 (2010)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7251/5685
Copyright (c) 2015 Salahuddin Husein, Ignatius Sudarno, Subagyo Pramumijoyo, Dwikorita Karnawati
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7252
2015-09-05T02:48:41Z
jag:ART
Engineering geology evaluation for predicting the collapse susceptibility of Sidoarjo hot mud earth levees: A hazard assessment
Eka Putra, Doni Prakasa
Juwarso, Juwarso
Karnawati, Dwikorita
Since May 29, 2006, a sea of hot mud has been gushing from the ground in Sidoarjo, East Java, 35 kilometres south of Indonesia’s second largest city, Surabaya. Due to this disaster, approximately thousand of peoples have been forced from their homes because 600 ha of land and villages were submerged, farmland was ruined, businesses and schools closed as the mud inundated the surrounding area. The authorities response was to build containment ‘basins’ or ‘ponds’ by enclosing areas of land within earth dams, or levees. During the heavy rain on the rainy season, the earth dams and ringdykes have overflown and broken regularly, causing the flooding of more land and damaging infrastructures. However, not only in the rainy season, the levees had also collapses during the dry season. Therefore, an engineering geology study was conducted in order to evaluate the geological factors which causes this phenomena. The parameters used for the evaluation are the heterogeniety of lithology under the dams, geological discontinuity which indicated by the occuring of surface cracks and bubbles, and subsidence phenomena which indicated by the vertical displacement. Overlying method was used to build homogeniety zone of engineering geology based on those parameters, and the resulted map was once again overlay with the location of dams collapses. Result of this evaluation shows that the earth dams collapses were highly correlated with the existing geological discontinuities and subsidences, respectively. Based on this study, the susceptible location of earth dams collapses can be predicted and allow engineers to prepare and plan better engineering solution for the high probable collapses points in order to protect land and infrastructures from the damaging hot mud overflown.
Keywords: Hot mud disaster, geological factors, homogeniety zone, earth levee failure points, Sidoarjo-Indonesia
Geological Engineering Department Universitas Gadjah Mada
2015-09-05
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
https://journal.ugm.ac.id/jag/article/view/7252
10.22146/jag.7252
Journal of Applied Geology; Vol 2, No 2 (2010)
2502-2822
2086-5104
en
Copyright (c) 2015 Doni Prakasa Eka Putra, Juwarso Juwarso, Dwikorita Karnawati
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7253
2015-09-05T02:53:07Z
jag:ART
COPPER (Cu2+) REMOVAL FROM WATER USING NATURAL ZEOLITE FROM GEDANGSARI, GUNUNGKIDUL, YOGYAKARTA
Wilopo, Wahyu
Haryono, Septiawan Nur
Eka Putra, Doni Prakasa
Warmada, I Wayan
Hirajima, Tsuyoshi
Development of indusrialization and urbanization not only increase economic growth but also contribute to the environmental degradation, especially contamination of heavy metals in water. In other side, there are many geological materials have capability to immobilize heavy metals. Therefore, the objective of this research is to know the maximum capacity of natural zeolite from Trembono area, Gunung Kidul regency to immobilize copper (Cu2+) from water and to understand their mechanism. This experiment was carry out by a batch test. The result showed that the maximum capacity of zeolite to immobilize Cu (qmax) is 63,69 mmolCu/kg Zeolite according to Langmuir adsorption equilibrium model. In addition, the capability to immobilize Cu will increases due to decreasing the grain size. The result of this research can be used as an alternative for waste water treatment, especially Cu.
Keywords: Removal, copper (Cu2+), natural zeolite, Langmuir isotherm
Geological Engineering Department Universitas Gadjah Mada
2015-09-05
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7253
10.22146/jag.7253
Journal of Applied Geology; Vol 2, No 2 (2010)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7253/5686
Copyright (c) 2015 Wahyu Wilopo, Septiawan Nur Haryono, Doni Prakasa Eka Putra, I Wayan Warmada, Tsuyoshi Hirajima
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7254
2015-09-05T02:59:18Z
jag:ART
GROUNDWATER VULNERABILITY OF PANDAK AND BAMBANGLIPURO, YOGYAKARTA SPECIAL PROVINCE, INDONESIA
Snguon, Leakhena
Eka Putra, Doni Prakasa
Hendrayana, Heru
The study of intrinsic vulnerability of groundwater was generated in order to delineate groundwater protection zone in Pandak and Bambanglipuro, Indonesia, whose mainly water supply is from groundwater. Two methods of vulnerability mapping are chosen for the evaluation; DRASTIC method and Hoelting method. The resulted maps conducted from these method are validated using the actual contaminant concentration through the impact of on-site sanitation, for instance nitrate as it is proved to be very stable contaminants in groundwater. Considered in different hydrogeological setting, these two methods have produced various results at the certain site. However, its reliability has been drawn upon the nitrate concentration at the study areas.
Keywords: Intrinsic groundwater, vulnerability, DRASTIC, Hoelting methods, nitrate contamination
Geological Engineering Department Universitas Gadjah Mada
2015-09-05
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7254
10.22146/jag.7254
Journal of Applied Geology; Vol 2, No 2 (2010)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7254/5687
Copyright (c) 2015 Leakhena Snguon, Doni Prakasa Eka Putra, Heru Hendrayana
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7255
2015-09-05T03:02:21Z
jag:ART
THE IMPACT OF SANITATION ON GROUNDWATER NITRATE LEVEL IN BANTUL DISTRICT, BANTUL REGENCY, YOGYAKARTA SPECIAL PROVINCE, INDONESIA
Heng, Salpisey
Eka Putra, Doni Prakasa
Wilopo, Wahyu
Bantul is one district of Yogyakarta Special Province which residents mostly use on-site sanitation. On-site sanitation is well-known for hot-spot system of nitrate groundwater contamination. It is because the wide-practice of failure of on-site sanitation systems. Besides, the failure of on-site sanitation system, it will depend on the age of settlement, population density, sanitation arrangement and sanitation behavior including water use patterns. Because of this, nitrate has leaked to groundwater and polluted many supply wells surrounding the septic systems.
Since the repeated intake of nitrate could cause various acute and chronic effects to human health, especially the infant’s health under 3 months (blue baby syndrome), it is crucial to undertake the study of impact of sanitation on groundwater nitrate level in Bantul district to acquire a better understanding of the effect of settlement age, population density, sanitation arrangement and sanitation behavior on the concentration of nitrate in groundwater. In order to recognize or achieve the understanding of this issue, a methodology is conducted by observation directly to the field, including the measuring of groundwater table and the distance of septic tank to well, and also make the questionnaires for the mentioned parameters.
Finally, the result of each factors (Sanitation arrangement, Settlement age, House density) are shown a low relationship with nitrate concentration, although water use patterns does not. However, the combination of these three factors can show up to find out a better correlation than one factor with this nitrate concentration. Although it has a good relationship with nitrate concentration (average), the variation of nitrate concentration from high to low shows a low relationship. Therefore, the importance of groundwater vulnerability cannot be overlooked in explaining the variation in contaminant concentrations because the nitrate concentration in the groundwater does not only depend on contaminant loading but also groundwater vulnerability.
Keywords: Groundwater, on-site sanitation, nitrate concentration, contaminant loading
Geological Engineering Department Universitas Gadjah Mada
2015-09-05
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7255
10.22146/jag.7255
Journal of Applied Geology; Vol 2, No 2 (2010)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7255/5688
Copyright (c) 2015 Salpisey Heng, Doni Prakasa Eka Putra, Wahyu Wilopo
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7256
2015-09-05T03:04:18Z
jag:ART
THE USE OF FORAMINIFERA FOSSILS FOR RECONSTRUCTING THE YOGYAKARTA GRABEN, YOGYAKARTA, INDONESIA
Barianto, Didit Hadi
Kuncoro, Pentatok
Watanabe, Koichiro
The Yogyakarta region is located in the southeastern part of Central Java, Indonesia. The region forms an elongated northeast – southwest-trending central depression bordered by two parallel faults in the west and east. These major faults divided the area into three parts, including the western, central and eastern parts. Herein, we investigate the relative uplift rate of the each part by using planktonic and benthonic foraminiferas. The foraminifera will show the initial position/datum of each part before uplift. Over sixty samples (primarily limestones and marls) were taken for this research. The uplift rates of each part were different and created a depressed block control by way of parallel faults. Based on foraminifera fossil observations, each block was in the same depositional environment (inner neritic) during N9. The present positions indicate that the western part was uplifted higher than the others, with this part being uplifted more than 590 meters. The central part was uplifted less than 120 meters, and the eastern part was uplifted above an altitude of 170-300 meters.
Keywords: Foraminifera fossil, planktonic, benthonic, graben, uplift
Geological Engineering Department Universitas Gadjah Mada
2015-09-05
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/7256
10.22146/jag.7256
Journal of Applied Geology; Vol 2, No 2 (2010)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/7256/5689
Copyright (c) 2015 Didit Hadi Barianto, Pentatok Kuncoro, Koichiro Watanabe
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/7257
2020-08-07T04:01:21Z
jag:ART
oai:jurnal.ugm.ac.id:article/7258
2020-08-07T04:01:21Z
jag:ART
oai:jurnal.ugm.ac.id:article/7259
2020-08-07T04:01:21Z
jag:ART
oai:jurnal.ugm.ac.id:article/7260
2020-08-07T04:01:21Z
jag:ART
oai:jurnal.ugm.ac.id:article/7261
2020-08-07T04:01:21Z
jag:ART
oai:jurnal.ugm.ac.id:article/7262
2020-08-07T04:01:21Z
jag:ART
oai:jurnal.ugm.ac.id:article/7263
2020-08-07T04:01:21Z
jag:ART
oai:jurnal.ugm.ac.id:article/7264
2020-08-07T04:01:21Z
jag:ART
oai:jurnal.ugm.ac.id:article/7265
2020-08-07T04:01:21Z
jag:ART
oai:jurnal.ugm.ac.id:article/7266
2020-08-07T04:01:21Z
jag:ART
oai:jurnal.ugm.ac.id:article/7267
2020-08-07T04:01:21Z
jag:ART
oai:jurnal.ugm.ac.id:article/7268
2020-08-07T04:01:21Z
jag:ART
oai:jurnal.ugm.ac.id:article/7269
2020-08-07T04:01:21Z
jag:ART
oai:jurnal.ugm.ac.id:article/7270
2020-08-07T04:01:21Z
jag:ART
oai:jurnal.ugm.ac.id:article/7271
2020-08-07T04:01:21Z
jag:ART
oai:jurnal.ugm.ac.id:article/7273
2020-08-07T04:01:21Z
jag:ART
oai:jurnal.ugm.ac.id:article/7274
2020-08-07T04:01:21Z
jag:ART
oai:jurnal.ugm.ac.id:article/16917
2017-10-24T04:15:08Z
jag:ART
Characteristics Of Hydrothermal Alteration In Cijulang Area, West Java, Indonesia
Tun, Myo Min
Warmada, I Wayan
Harijoko, Agung
Al-Furqan, Reza
Watanabe, Koichiro
Characterization of hydrothermal alteration in theCijulang area (West Java, Indonesia) was carriedout using shortwave infrared spectroscopy. Hydrothermal alteration in the Cijulang area occurs in the calc-alkaline volcanic and volcaniclastic rocks. Shortwave infrared spectroscopic measurements of reflectance for altered rocks and minerals were carried out by ASD-FieldSpec and the laboratory spectra acquired were then analysed with “The Spectral Geologist” software program. Shortwave infrared spectroscopy is capable of detecting most finegrained alteration minerals from different hydrothermal alteration zones. Characteristic alteration minerals identified from the SWIR technique include pyrophyllite, alunite, kaolinite, dickite, illite, montmorillonite, polygorskite, gypsum, epidote, paragonite, and muscovite. Most of the spectra show mixture ofalteration minerals and only a few display pure spectra of single mineral. The crystallinity of kaolinite from the samples was also determined from the reflectance spectra and show moderately to high crystallinity. Alteration system of the Cijulang prospectis similar to others documented high-sulfidation epithermal deposits, such as Rodalquilar (Spain), Summitville (Colorado), and Lepanto (Philippines). A characteristic alteration sequence and zonation of advanced argillic, argillic and propylitic alterationoutward from the silica core has resulted from the progressive cooling and neutralization of hot acidic magmatic fluid with the host rocks.Keywords: Cijulang, High-sulfidation, Alteration minerals, Shortwave Infrared Spectroscopy
Geological Engineering Department Universitas Gadjah Mada
2015-09-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/16917
10.22146/jag.16917
Journal of Applied Geology; Vol 7, No 1 (2015)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/16917/11123
Copyright (c) 2015 Myo Min Tun, I Wayan Warmada, Agung Harijoko, Reza Al-Furqan, Koichiro Watanabe
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/16918
2018-01-15T03:02:10Z
jag:ART
Geochemical Fraction, Mobility And Bioavailability Of Lead In Unsaturated Soil Of Yogyakarta City, Indonesia
Zaw Aye, Saw Aung
Hendrayana, Heru
Eka Putra, Doni Prakasa
Sato, Tsutomo
Lead (Pb) is one of common heavy metals found inthe soil of urban environment. In Yogyakarta City,Indonesia, lead content in the soil was already reported by some researchers, however all of the report were only reveals the distribution of lead concentration in the soil. Therefore, this research paper aims to understand the geochemical fraction leadin the soil of Yogyakarta City and assess the mobility and bioavailability of lead release to the environment. The soil sampling location is selected on Kotagede District, representing the oldest urban area of Yogyakarta city. A shallow bore hole was drill until about 7 m below the surface and soil/sediments weresampled for each 1 m depth started from the surface. Six steps of sequential extraction procedures were carried out to assess the geochemical fraction of Pb for each of soil samples. The sequential extraction shows that the highest amount of Pb in thesoil of Yogyakarta City is found in amorphous ironoxide, crystalline iron oxide and non residual fraction form of Pb. Based on the results of geochemical fraction, the mobility factor of lead can be calculated and reveals low mobility factor range from 0.4 to 3.3%. The mobility of lead is decreased from the surface to the deeper soil, on the other hand the bioavailability of Pb calculated from exchangeable and carbonate fraction is also show low risk of bioavailability. Therefore, it can be concluded that although Pb concentration is high in non-residual fraction, Pb isin low risk condition due to its poor mobility and bioavailability. But, concern on lead contamination should be considered because if the concentration of Pb is enriched over the adsorption capacity of ironoxide, it can easily release to the environment and can impact to human in the future.Keywords: Yogyakarta city, Lead, Sequential extraction, Geochemical fraction
Geological Engineering Department Universitas Gadjah Mada
2015-06-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.ugm.ac.id/jag/article/view/16918
10.22146/jag.16918
Journal of Applied Geology; Vol 7, No 1 (2015)
2502-2822
2086-5104
eng
https://journal.ugm.ac.id/jag/article/view/16918/11124
Copyright (c) 2015 Saw Aung Zaw Aye, Heru Hendrayana, Doni Prakasa Eka Putra, Tsutomo Sato
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/16919
2020-02-20T03:32:46Z
jag:ART
Site Investigation For Construction Of Emergency Spillway At The Jatigede Dam
Indrawan, I Gde Budi
Warman, Gusti Imam
An emergency spillway has been planned to be constructed at the Jatigede Dam, West Java, to allow floodwater to flow downstream and to prevent the capacity of the main spillway to be exceeded during large flood events. The complex geology of theJatigede Dam area, however, poses a challenge to determine the suitable location for the emergency spillway construction, either in the area to the west or to the east of the embankment dam. An engineering geological mapping and landslide susceptibilityzoning were conducted to determine the engineeringgeological characteristics of the area surrounding theJatigede Dam. The site investigation showed that thearea to the west of the embankment dam tended tohave a lower slope inclination than the area to theeast of the embankment dam. Both areas to the westand to the east of the embankment dam were found tobe composed of less erosion resistant rock units. Theexistence of the earth retaining structures for slopestabilization in the area to the east of the embankment dam will, however, likely limit the flexibility in developing the emergency spillway route. With respect to the existence of fault systems, both areas to the west and to the east of the embankment dam will likely be influenced by similar conditions. The areato the west of the embankment dam tended to be lesssusceptible to landslide as compared to the area tothe east of the embankment dam. The undevelopedland use of the area to the west of the embankmen dam as compared to the area to the east of the embankment dam will provide more flexibility in construction of the emergency spillway. Due to the morefavorable engineering geological conditions, the area to the west of the embankment dam is proposed forthe location of the emergency spillway construction.Keywords: Emergency spillway, Engineering geological mapping, Jatigede Dam
Geological Engineering Department Universitas Gadjah Mada
2015-06-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
application/pdf
https://journal.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://journal.ugm.ac.id/jag/article/view/16919/11125
Copyright (c) 2015 I Gde Budi Indrawan, Gusti Imam Warman
http://creativecommons.org/licenses/by-sa/4.0
oai:jurnal.ugm.ac.id:article/16921
2017-07-19T06:55:53Z
jag:ART
oai:jurnal.ugm.ac.id:article/16922
2017-07-27T00:23:32Z
jag:ART
oai:jurnal.ugm.ac.id:article/16934
2017-07-26T07:54:59Z
jag:ART
oai:jurnal.ugm.ac.id:article/16935
2017-07-26T07:54:59Z
jag:ART
oai:jurnal.ugm.ac.id:article/16936
2017-07-26T07:54:59Z
jag:ART
oai:jurnal.ugm.ac.id:article/16938
2017-07-26T07:54:59Z
jag:ART
oai:jurnal.ugm.ac.id:article/16939
2017-07-26T07:54:59Z
jag:ART
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