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INDONESIA
Journal of Geosciences and Applied Geology
Published by Universitas Padjadjaran
ISSN : 25793136     EISSN : 25793136     DOI : https://doi.org/10.24198/gsag.v7i3
Core Subject : Science, Engineering,
Earth & Planetary Sciences Engineering
Journal of Geological Sciences and Applied Geology (GSAG) is a National multidisiplinary Journal focus on Geological Sciences, Applied Geology, and Geological Engineering and Earth Science. Our Mission is to publish research related to (but not limited) Geology Petrology Paleontology Stratigraphy Sedimentology Remote Sensing Geomorphology GIS Engineering Geology Geotechnics Geochemistry Geophysics Geological Hazard and Disaster Geopark Hazard Mitigation Geography Earth Sciences
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 133 Documents
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GEOLOGICAL STRUCTURE OF CITUNDUN AND SURROUNDING CIWARU DISTRICT, KUNINGAN REGENCY, WEST JAVA PROVINCE Arfiansyah, Kurnia; ICHSAN, MUHAMAD; Patonah, Aton
Journal of Geological Sciences and Applied Geology Vol 6, No 1 (2022): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v6i1.45212

Abstract

Based on the Regional Geological Map of the Majenang sheet (Kastowo and Suwarna, 1996), the study area is part of the Halang Formation and the Bogor Zone (Van Bemmelen, 1949). Research conducted using the geological mapping method shows that the Citundun area and its surroundings have complex geological and tectonic structural conditions.The geological structures that develop are folds, joints and faults. The fold structure in the study area occurs during the Miocene – Pliocene transition with the main axis of the fold trending relatively northwest – southeast where from north to south, namely the Karangkancana Anticline, Kaduagung Syncline, Kaduagung Anticline, Cipari Syncline, Cipari Anticline, Sagara Syncline, Sagara Anticline, Jabranti Syncline, and Jabranti Anticline.Based on joint processing data and structural lineaments, the lineament results trending northwest-southeast and southwest-northeast. Joint structures are found in carbonate sandstones and carbonate claystones with hard and rather hard levels of hardness. In the study area, there are two strike slip fault structures, namely Sagara Sinistral Strike Slip Fault and Cipari Dextral Strike Slip Fault which are trending northeast-southwest. From the results of joint data analysis, a fault indication was withdrawn because the distribution of joint directions was supportive. Based on the regional tectonic age of West Java, during the Miocene - Pliocene the fault in the study area occurred after deposition of sandstone unit (Sbpn), carbonate claystone unit (Sblk) and carbonate sandstone unit (Sbpk) so that this fault structure is interpreted to be Pliocene in age. Referring to the concept of Moody and Hill (1956), the faults in the study area are strike slip faults of the first and second order.Keywords: Citundun, Geological Structure, Syncline, Anticline, Strike Slip Fault.
Stratigraphy and structural pattern of Kebumen Region using Second Vertical Derivative of Gravity Data, Central Java Alam, Syaiful
Journal of Geological Sciences and Applied Geology Vol 4, No 1 (2020): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v4i1.29018

Abstract

Gravity forward modeling has been carried out in Kebumen Region, Central Java Province. With its position on the mélange complex, the geological complexity in this area is still a challenge to be modeled. Bougeur anomaly values in the study area ranged from 50 mGal to 130 mGal. The structural morphology of the Luk-Ulo Mélange Complex and Kulon Progo Mountain have higher Bougeur anomaly, ranging from 105 to 125 mGal. The residual positive anomaly zones in the northwest and southeast are situated with residual negative anomaly zones in between. The shallow effect through the Second Vertical Derivative method shows the patterns of fault types separating the two anomalous zones of Karangsambung and Kulon Progo region. The Luk Ulo Mélange Complex and stratigraphy of Karangsambung Formation up to Halang Formation are faulted by thrust-fault and strike-slip structural pattern. Keyword: Stratigraphy, structural pattern, second vertical derivative.
SOURCE ROCK POTENTIAL AND DEPOSITIONAL ENVIRONMENT OF OIL SHALE BASED ON PETROGRAPHY CHARACTERISTICS AND ORGANIC GEOCHEMISTRY IN KAPUR IX, WEST SUMATRA Rahmola, Wiryadi Rizkiputra; Syafri, Ildrem; Winantris, Winantris; Suwarna, Nana
Journal of Geological Sciences and Applied Geology Vol 2, No 6 (2018): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v2i6.20868

Abstract

The research area were located in the Kapur IX District, Lima Puluh Kota Regency, West SumatraProvince. The research focused on Kapur IX Intramontane Sub-basin filled with oil shale. Theanalysis was carried out on shale samples of the Kapur IX Intramontane Sub-basin collected fromoutcrops to evaluate the source rock characteristics, including type of oil shale, depositionalenvironment, and dispersed organic matter. Geochemical analyses include total organic carbon(TOC) and Rock-Eval Pyrolysis, while organic petrographic analysis comprises organic materialcomposition and vitrinite reflectance. Based on the results the oil shale of the study area has lowto excellent quality and richness, type II and II kerogen content, with the maturity level of lateimmature to early mature. The dominant lamalginite maceral content in the sample tends toindicate the oil shale in the research area is a Green River type. The liptinite maceral group isdirectly proportional to the value of Potential Yield (PY) indicating that the maceral group, especiallyalginite plays a role in producing hydrocarbons in the oil shale of the study area. Based on thecomposition of maceral data, the depositional environment of oil shale of the Kapur IXIntramontane Sub-basin is interpreted to be a lacustrine environment with brackish watercondition.
Linking Petrography And Petrophysical Analysis In Carbonate Reservoir Characterization: Case Study In Baturaja Formation Offshore Northwest Java Natasia, Nanda; Alfadli, Muhammad Kurniawan; Arfiansyah, Kurnia; Hardiyono, Adi; Barkah, Mohamad Nursiyam; Haryanto, Iyan
Journal of Geological Sciences and Applied Geology Vol 2, No 2 (2017): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v2i2.13448

Abstract

AbstractLinking geological analysis with petrophysical characterization in complex carbonate reservoir is a chalangging task. Many previous researcher has proofed that depositional facies in carbonate reservoir has very little advantages in reservoir quality due to overprinted with diagenetic facies. The difficulties in characterized the carbonate may rise because one does not include some genetic, geometrical and petrophysical character of the pore space, both geometry and distribution. The aim of this study is to evaluate the reservoir rock typing in carbonate reservoir by comparing rock-fabric descriptions analyzed in thin section with laboratory measurements of porosity, permeability, capillarity, and Archie m values. Methodology employed for this study involved the examination of thin sections and the integration of routine analysis data following lucia’s pore classification scheme. The first step in characterized the petrophysical class is the determination of interparticle porosity by substracting the separate vug porosity from total porosity. The separate vug porosity is estimated in petrographic analysis in 325 thin section samples. Than estimating the value for un cored interval by determining the relationships between total porosity, separate vug porosity and sonic interval transit time. The petrographic analysis to estimating the separate vug porosity is a qualitative way, and so the value is not quantitative, but the trend is still implies the value so the relationships between porosity and sonic log can be quantified. Calibration of pore types to acoustic log response is accomplished by making a detailed log of porosity types described from thin sections and constructing Z-plots of total porosity and transit time from logs and separate-vug porosity from thin sections . The “m” value (lithology exponent or cementation factor) is different from the other terms in the Archie equation in that it is related to rock fabrics, specifically to vuggy porosity. Reservoir characterization by using this scheme has proofed that geological analysis made in detailed thin section can be a helpfull tool since the validation in tested and produced interval shows a verry good relationships. Keywords : Reservoir Characterization, Baturaja Fm., Carbonate, Petrophysics.
Study Seismotectonic Around Kalimantan Island Using Likelihood Method Haryanto, Iyan; Lamba, Lisa; Ayu, Shinta; Sunardi, Edy
Journal of Geological Sciences and Applied Geology Vol 5, No 1 (2021): Journal of Geological Science and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v5i1.35096

Abstract

Based on Indonesia Seismicity Map and Indonesia Seismotectonic Unit Map (Geological Research and Development Center, 2003), it can be seen that the Kalimantan Island area has the lowest earthquake vulnerability compared to other regions in Indonesia. However, in past recent years, there have been several destructive earthquakes occur in this area. As it occurred on June 5, 2015, in Ranau area with a magnitude of 6, on December 21, 2015, in Tarakan area with a magnitude of 6.1, on June 24, 2016, with a magnitude of 5.1, on 25 February 2015 with a magnitude of 5.7 in the northeast of Tarakan and 12 July 2018 in Katingan with a magnitude of 4.2. This indicates that the possibility of a potential earthquake in the Kalimantan area can still occur. For this reason, it is necessary to identify seismotectonics and the recurrence period to ensure the potential for earthquake hazards on the Island of Kalimantan. The likelihood method is used to calculate those parameters with earthquake data from 2009-2020 with a magnitude ≥ 5 and a depth of 0 – 350 Km sourced from the Meteorology, Climatology and Geophysics Agency (BMKG). Based on the calculation results, it is obtained that the value of a is 2.71222 and the value of b is 0.64077. In general, it can be concluded that the seismicity level of Kalimantan Island is quite low.Keyword: Seismotectonic, Kalimantan Island, Seismicity index, likelihood method
GEOLOGY OF BUAHDUA AREA, SUMEDANG DISTRICT, WEST JAVA PROVINCE Raditya Rendra, Pradnya Paramarta; Sulaksana, Nana
Journal of Geological Sciences and Applied Geology Vol 3, No 3 (2019): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v3i3.25731

Abstract

Buahdua area is located in Sumedang District, West Java Province with coordinate 107°53’52,30” E - 107°59’18,83” E and 6°44’2,15” S - 6°38’38,39” S.  This research aims to identify and characterize the geology of Buahdua area and its surrounding. This research used field observation, studio, and laboratory analysis method. Digital maps used to carried out processing step in studio and field tools such as geological hammer, camera, GPS, and compass used to carried out field observation. Rock samples are taken for laboratory analysis. Based on field observation, studio, and laboratory analysis, the research area can be divided into four morphology unit namely very gentle sloping hill, gentle sloping hill, rather steep hill, and steep hill morphology unit. Also, the research area has four drainage patterns namely anastomotic, subdendritic, subparalel, and subrectangular drainage pattern. The lithostratigraphic units in the research are can be divided into three units namely claystone (Tmbl), sandstone (Tmbpl), and volcanic breccia (Kbv) unit, and alluvium (Kal). The geological structures developed in the research area are shear joint and oblique fault (Cikandung and Kamal oblique fault). Geological history of the research area was started from middle Miocene (N9) when claystone unit was deposited in deep marine environment. In middle Miocene (N9 - N10), sandstone unit was deposited in deep marine environment. After those rock unit, there was tectonic activity in Pliocene - Plistocene caused geological structures, shear joint and oblique fault. Occurences volcanic activity after tectonic activity caused volcanic breccia unit was deposited. After those process, alluvium was deposited in Cikandung River until now.
LITHOLOGIC ORDER MAPPING AND ROCK RESOURCES INVENTORY OF KUTAWARINGIN QUADRANGLE, WEST JAVA Ganjar Gani, Reza Mohammad; Firmansyah, Yusi; Nurdrajat, Aji
Journal of Geological Sciences and Applied Geology Vol 2, No 4 (2018): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v4i2.18377

Abstract

In general, the southern part of Bandung is composed of rocks produced by volcanic activity. Research in this region based on the want to understand the geology of volcanoes in Bandung and surrounding areas including the origin of the formation of the Bandung Basin (Bronto & Hartono, 2006). The Bandung basin is almost surrounded by volcanoes; even in the midst there is also volcanic rock (Silitonga, 1973, Alzwar drr., 1992). Information about why and how the area of Bandung to be controlled by volcanic rocks is needed to find out more potential resources as well as geological disasters due to volcanic activity. This study aims to decide the history of volcanism in South Bandung. I want to represent a complex area seen from the diversity of geological and rock environment conditions. This diversity condition controls the landscape and geological conditions observed at this time. The purpose of the preparation of this study is to be used to develop the Stratigraphic order and inventory of minerals.Keywords: Kutawaringin, stratigraphy, resource potential
CORRELATION BETWEEN OVERALL SLOPE AND SLOPE STABILITY OF HIGHWALL IN PIT TUNGGAL, BORNEO MANIK, VITO ARISTO; NINGRUM, WIWIN JUNITA; KHOIRULLAH, NUR; SOPHIAN, RADEN IRVAN; ZAKARIA, ZUFIALDI
Journal of Geological Sciences and Applied Geology Vol 3, No 1 (2019): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v3i1.22030

Abstract

Slope stability is an important aspect of the mining operation. Hence, an in-depth understanding of slope stability and variable that affect it is very crucial.  This research was conducted in pit tunggal, Borneo. The aim of this research is to identify the correlation between overall slope and slope stability in highwall slope at pit tunggal. Slope stability analysis was conducted with SLIDE V 6.00 software using Morgenstern-Price’s limit equilibrium method. The result of this research shows that, as the highwall slope gets steeper, the slope stability represented by a factor of safety (FS) may decrease. Otherwise, when the highwall slope gets declivous, the factor of safety may increase.
Dryobalanoxylon sp. : a fossil wood preserved in the Genteng Formation from Lebak Regency, Banten Province, Indonesia oktariani, Hanny; Winantris, .; Fauzielly, Lili; Damayanti, Ratih
Journal of Geological Sciences and Applied Geology Vol 2, No 3 (2017): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v2i3.15620

Abstract

The fossilized wood unearthed in Sindangsari Village, Sajira District, Lebak Regency, Banten Province, Indonesia. The depositional environment of this Early Pliocene  fossilized wood that has been  found  in tuff sediment of Genteng Formation corresponds littoral to terrestrial deposition. To identify a fossil wood type, preparation made from three sides; transverse, radial and tangential. The preparation of  thin section following to the one method in the rock petrography.  Anatomical features of the fossil wood are as follows : wood porous diffuse, vessel almost exclusively solitary with 7 – 14 / mm2, ray width 1 to 3 cells, larger rays commonly 4 to 10 seriate, body ray cells procumbent with one row of upright and/or square marginal cells,  axial canals in long tangential lines, prismatic crystals in parenchyma cells.  These features show affinities of the fossil wood to Dryobalanoxylon member of family Dipterocarpaceae.
Geological and Geomorphological Studies in Parts of Angkola Sangkunur District, South Tapanuli Regency, North Sumatra Azzaenuri, Mohammad Fachri; Rosana, Mega Fatimah; Sunarie, Cecep Yandri; Angga Syahputra, Muhammad Eko; Marbun, Ardiansyah
Journal of Geological Sciences and Applied Geology Vol 7, No 2 (2023): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v7i2.50440

Abstract

This research focuses on studying geological conditions that develop in the research area which is based on studies related to geomorphology, stratigraphy and geological structures that develop in the research area. In this research, the data used comes from mapping and taking surface data in a research area with an area of 12.5 km2, followed by petrographic analysis to determine the types of rocks found in the research area. The research area is divided into three geomorphological units, namely Sloping Volcanic-Structural Rolling Hills, Steep Volcanic-Structural Hills, and Sloping Volcanic-Structural Rolling Hills. The drainage pattern in the research area consists of parallel patterns in almost the entire area and sub-dendritic flow patterns in the central part of the area. The research area is composed of 3 lithologies, from old to young, namely, andesite, diorite which was formed as an intrusion, and breccia which consists of polymic and monomic breccia with fragments in the form of andesite, diorite, quartz fragments and carbon. The structures in the study area have the main directions northwest-southeast and northeast-southwest, both of which influence the morphology of the study area.

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