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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 117 Documents
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LOWWALL SLOPE STABILITY OF PANEL 32 AND PANEL 36 PT. XYZ, SOUTH KALIMANTAN Aliyuddin Jamil; Raden Irvan Sophian; Pradnya Paramarta Raditya Rendra
Journal of Geological Sciences and Applied Geology Vol 7, No 1 (2023): 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.v7i1.48196

Abstract

The research was conducted in the coal mining area of PT. XYZ, South Kalimantan. The research aims to create a geological model for each cross-section according to the characteristics of materials and to calculate the slope stability of the lowwall slope. The researcher calculated the slope stability using Morgenstern-Price method with Rocscience Slide2 software. The geological conditions of the study area are composed of alternating sandstones with coal-inserted claystone and coal-inserted claystone from the Warukin Formation. Material properties at the study area are composed of sandstone, claystone, and coal. The results of the slope stability simulation show that the lowwall panel 32 slope has a safety factor value of 1.081 while the lowwall panel 36 slope has a safety factor value of 1.107.
THE BANDUNG CITY SPATIAL PLANNING POLICIES IN GEOLOGICAL PERSPECTIVE Emi Sukiyah; Nur Khoirullah
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.v4i1.29147

Abstract

The Bandung city has an advantageous position, both from geographical, geological, political, and strategic aspects. The location of Bandung city, which is in the highlands, is famous for its cool weather. Since the colonial era of the Dutch East Indies, Bandung City has been the center of government and research in the field of geology. One piece of evidence that is still well preserved is the Geology Museum. Even the impression of geology is still strong with the many government institutions in the field of geological development in this city. The aspect of natural resources, including geology, is also the main asset to organize the Bandung city. The volcanic products that underlie this city become a fertile land for agriculture and the mining industry for construction and industrial materials. Several rivers also flow in this area. The hilly panorama with the post-volcanism phenomenon is an attraction for developers in the tourism sector. The groundwater potential is also abundant. The development of Bandung City does not mean that there are no obstacles. The significant increase in population has earned this city the nickname of the most populous city in West Java. If the city government cannot control the increase in the population density, it is not impossible that this city will be a city that does not have the appeal again. In fact, now the impact is already being felt, traffic jams, floods, waste, etc. Bandung city spatial planning should be carried out in an integrated manner, involving historical, geological, geographic, socio-cultural, political, and strategic aspects.
DETERMINATION OF POTENTIAL HYDROCARBON AND TECTONOSTRATIGRAPHY ANALYSIS BASED ON 2D SEISMIC IN PADAMARANG SUB-BASIN, BONE BASIN, SOUTH PART OF SULAWESI Fauzan Aditya Haqiqie; Edy Sunardi; Nisa Nurul Ilmi; Agus Santa Ginting
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.v2i6.20872

Abstract

Sulawesi is a main island in Indonesia that has a complex geological setting. This complexity is caused by assemblage of 3 major plates called as triple junction. Repercussions of these plates assemblage is emerging many basins in Sulawesi area, Bone Basin is one of it. Bone Gulf is a prospect basin for petroleum exploration. Bone Gulf is a frontier area for hydrocarbon exploration. In order to understand and to determinate lead of a frontier area, Seismic interpretation through 2D seismic data is required. 2D seismic interpretation in this area of study using tectonostratographic approach. This study could be a reference and recommendation for further hydrocarbon exploration in this area. This study shows a result that in Bone Basin has 3 main sub-basins (Padamarang, North Kabaena, and South Kabaena) separated by basement highs and this research focused in Padamarang Sub-basin. There are 4 Tectonostratigraphic units in Padamarang Sub-basin, these are include basement (Unit X), Early Rifting (Unit A), Rifting (Unit B), Post Rift (Unit C), dan Post Rift (Seabed/ Unit D & E). There are 2 lead located in Late Miocene Carbonate buildups (represents in seismic section as mounded seismic horizon) showed in BN07-06 and BN07-07 seismic cross section on Padamarang Sub-basin.
Origin of Oil Seeps in West Sulawesi Onshore, Indonesia: Geochemical Constraints and Paleogeographic Reconstruction of the Source Facies Yarra Sutadiwiria; . Yeftamikha; Ahmad Helman Hamdani; Yoga Andriana; Iyan Haryanto; Edy Sunardi
Journal of Geological Sciences and Applied Geology Vol 2, No 1 (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.v2i1.13420

Abstract

ABSTRACTNumerous oil and gas seeps occur at onshore West and South Sulawesi. These may indicate the presence of active petroleum system in subsurface hence the area is worthy for further exploration. No discovery well so far in this area. Therefore, the seeps provide significant data to build integrated petroleum system analysis.A number of geochemical analysis were conducted on the oil seeps and rock samples from outcrop and well cuttings to reveal the source rocks that generate the oils. Triterpane m/z 191 shows low content of tricyclic terpane, low norhopane to hopane, and abundant oleanane. Sterane m/z 217 and bicyclic alkane m/z 123 show dominant C29 sterane and bicadinane. These biomarkers indicate that the source of oils are coals and/or coaly shales deposited in fluvio-deltaic setting. Contribution from marine input is shown in Karama region to the south.Based on stratigraphic setting of West and South Sulawesi, the best candidate for the source of oil seeps is Eocene coals or coaly shales of Toraja or Kalumpang Formation. The Eocene coal samples have been characterized and show similar GC alkane distribution with the oil seeps. Contribution from marine facies, which may age-equivalent to these coals are shown in Karama region.Aromatic methyl phenanthrene m/z 178 and m/z 192 were also analyzed to know their maturities and they were generated at maturity level equivalent with Ro 0.8-1.0 %.Based on geochemical constraints and geologic data, a paleogeographic setting of Eocene Toraja/Kalumpang Formation was built to know better about the paleo-source facies of the oils and its geochemical characteristics. Keywords: Biomarker, coaly shales, Toraja/Kalumpang Formation
STRUCTURAL CONTROL OF ALTERATION AND MINERALIZATION IN PROSPECT “X-Y”, POHUWATO REGENCY, GORONTALO PROVINCE Muhammad Faisal Wirdan; Mega Fatimah Rosana; Euis Tintin Yuningsih; Ahmad Iryanto Rompo; Fajar Ismail
Journal of Geological Sciences and Applied Geology Vol 5, No 3 (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.v5i3.35791

Abstract

The prospect “X-Y” is located in Gorontalo Province, a part of “gold district” with NW-SE arc-normal, E-W arc-parallel, and NS-NNE subsidiary lineament features and localize geological setting in the northern arm of Sulawesi. Regional geology of Sulawesi's northern arm is characterized of volcanoplutonic magmatic by typical Eocene to Recent island-arc assemblages (Hamilton, 1979). An older basement composed of granodiorite occurs in the north of the study area (Kavalieris, 1984). The study was conducted using variety of approaches, including desk top study, field mapping, and data interpretation. Desktop study are focused on lineament and fault fracture density interpretation. Field mapping include observation, measurement, and structure interpretation. Gold mineralization in the prospect “X-Y” are hosted in porphyritic dacite, lapilli tuff, and diatreme breccia unit. The type of mineralization generated epithermal low sulphidation with anomalous mineralization. It has the feature of a high fault-fracture density range of 2100-3200 m/
DISTRIBUTION PATTERN DIFFERENCES OF KALIWANGU FORMATION IN UJUNGJAYA AND PASIR MALATI, SUMEDANG, WEST JAVA Nisa Nurul Ilmi; Iyan Haryanto; Abdurrokhim Abdurrokhim; Billy Gumelar Adhiperdhana; Faisal Helmi; Johanes Hutabarat; Edy Sunardi
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.v3i3.26225

Abstract

The distribution of Kaliwangu Formation sediment in West Java generally follows the structure of Java fold thrust belt, which directed west-east. The Java fold thurst belt was efectively formed during Pleio-Pleistocene tectonics events, in which all of the Cenozoic sediment were deformed by compression stress in north-south direction. In Ujungjaya area, Kaliwangu Formation has northwest-southeast direction, while in Pasir Malati, the formation was arced relatively in north-south direction. Kaliwangu Formation distribution in Ujungjaya was influenced by the massive compression tectonics occurred in Java. This tectonic event were occurred during Pleio-Pleistocene which resulted in Java thrust fold structure pattern including Baribis Faults. Unlike in Ujungjaya, the distribution of Kaliwangu Formation in Pasir Malati was arced in north-south direction which caused by its fold structure. There is no indication of regional fault in Pasir Malati area although a lot of fault structure was found as a part of regional structure.
Stratified Soil Characterization using 1D Resistivity Inversion along the Pasuruan Coastline, East Java Syaiful Alam; Nur Khoirullah; Yanwar Yusup Rukmana
Journal of Geological Sciences and Applied Geology Vol 2, No 5 (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.v2i5.20248

Abstract

The inversion has been widely used in subsurface modeling of numerousdata. The number of stratified soil layer and thicknesswere driven by damped least-squares inversion method.This studyintegrated five borehole logs and six vertical electrical sounding measurements. The inversion result is able to predict an unsampled of borehole data. The resulting maximum rms error is 0.22 and minimum rms error is 0.011 from 1D inversion.The borehole datas indicatedgravelly soil layer, sandy soil layer,and clayey soil layer withthe resistivity values respectively range from 33.6-7.45 (Ohm.m), 7.45-3.98 (Ohm.m), and 3.98-0.016 (Ohm.m).Based on the studyresult there were possibilities of seawater intrusion indication according to the soil stratigraphic profile based on resistivity properties and borehole data. Keyword: Pasuruan coastline, stratified soil, 1D resistivity inversion.
GEOLOGY OF SILIHWANGI AREA, MAJALENGKA DISTRICT, WEST JAVA PROVINCE PRADNYA PARAMARTA RADITYA RENDRA; Emi Sukiyah
Journal of Geological Sciences and Applied Geology Vol 3, No 2 (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.v3i2.23094

Abstract

Silihwangi area is located in Majalengka District, West Java Province with coordinate 108°13’22” E - 108°16’5” E and 6°57’41” S - 7°0’22” S. This research aims to identifiy and know the geology of Silihwangi area and its surrounding. This research used digital maps to carried out processing step in studio and field equipment such as GPS, camera, compass, geological hammer, etc to carried out field observation. Some rock samples are taken for further analysis. Based on field observation and studio analysis, the research area can be divided into five morphology unit namely very gentle sloping hill, gentle sloping hill, rather steep hill, steep hill, and very steep hill morphology unit. Other than that, there are subparalel, radial, and subdendritic drainage pattern that can be found in the research area. The lithostratigraphic units in the research area, namely Sandstone (Tmbp), Claystone (Tpbl), Andesite intrusion (Ki), Tuff (Kt), and Volcanic breccia (Kbv) unit. Joint and lithology offset can be found in the research area.
DEPOSITIONAL ENVIROMENT CARBONATES SANDSTONE UNIT OF THE NYALINDUNG FORMATION BASED ON OUTCROP DATA Yusi Firmansyah; Reza Mohammad Ganjar Gani; Kurnia Arfiansyah Fachrudin
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.v2i3.15754

Abstract

The research area is located in Loji Village, Simpenan District, Sukabumi Regency, West Java Province. The research was conducted by geological mapping method. The determination of the carbonaceous rocks precipitation environment based on the characteristics of lithology and fossil analysis. Based on the characteristics of lithology, this unit consists of carbonate sandstones. In megaskopis unit of this Carbonate Sandstone has physical characteristics, brown, medium grain sand size - very fine sand, circular round, open pack - closed, good sorting and bad permeability. The results of fossil foraminifera bentonic and plantonic analysis show that the bathymetry zone is at the outer center of neritik So it can be predicted that the deposition environment of this unit is in shallow sea.Keywords : lithologic characteristics, bentonic foraminifera, depositional environment
The Hydrogeochemical Model of "YR" Geothermal Field, East Java Yunisa Rachmalia; Agus Didit Haryanto; Johanes Hutabarat; Yuniar Zhafira Abdillah
Journal of Geological Sciences and Applied Geology Vol 7, No 3 (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.v7i3.51240

Abstract

The YR Geothermal Field is located in East Java. This field is associated with an active volcano, implying a potential for a high enthalpy geothermal system. This field is still in the exploration phase, but no drilling has been conducted yet. Thus, insights into the geothermal system are obtained through geochemical analyses of geothermal manifestations. Geochemical analyses were performed on hot spring water samples to determine the characteristics, processes, origin, and fluid flow of the geothermal system. The research results indicate that the warm springs have temperatures ranging from 29.4 to 54.8°C, with a nearly neutral pH (6.14-6.44) and high contents of HCO3 (457-1150 mg/kg), Na (77.7-255 mg/kg), and Mg (37.4-110 mg/kg). Therefore, it can be concluded that all the warm springs fall into the bicarbonate type with immature conditions, indicating no direct association with the reservoir. The upflow zone is interpreted to be at the peak of Mount 7, while the outflow zones are in areas A, B, and C. The fluids flow from the upflow zone, then condense and advectively flow down the slope, experiencing dilution and reactions with rocks before emerging as outflows in the western and north-western areas.

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