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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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Morphometry And Morphotectonic Characteristics Of The Cisokan Watershed Segments Cilengkong And Cisukarama, West Java, Indonesia Rifqi Dwi Saprana; Irvan Sophian; Nur Khoirullah; Ismawan Ismawan
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.v5i1.34667

Abstract

West Java has a complex geological structure characteristic due to subduction events in the south of Java Island. The control of the geological structure affects the formation of the surrounding landscape, so analysis is needed to assess its activities. The research was conducted in the Cisokan sub-watershed in the Cilengkong and Cisukarama segments in Cianjur and West Bandung districts, West Java. The purpose of this study was to determine the morphometric and morphotectonic characteristics of the Cisokan watershed in the Cilengkong and Cisukarama segments. The method used is studio analysis using applications to process digital image data into morphometric and morphotectonic analysis parameters. The parameters analyzed were the bifurcation ratio, drainage density, basin shape index, drainage basin asymmetry, and mountain front sinuosity. The results obtained are that the Cilengkong segment has an Rb value of 4 - 4.5 with a medium flow density, a BS value of 1.80, an AF value of 25.8, and an SMF value of 1.19 - 2.78. The Cisukarama 1 segment has an Rb value of 4 - 4.25, a BS value of 1.62, an AF value of 57.14, and an SMF value of 1.66 - 3.41. The Cisukarama 2 segment has a value of Rb 3 - 4.25, a BS value of 1.59, an AF value of 42.5, and an SMF value of 1.34 and 2.13. The conclusion obtained is that tectonic activity as a landscape-forming factor in the study area decreases or even stops.
THE SALT POTENTIALS IN INDONESIA Emi Sukiyah; Vijaya Isnaniawardhani; Adjat Sudradjat; Faisal Muhamadsyah
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.v2i1.13419

Abstract

Abstract The salt deposits are unevenly distributed in the world. The most productive countries are China, USA and India. Indonesia experiences the salt deficit, due to the limited number of the deposits. The evaluation of the characteristics of salt deposit in the world reveals the Pre Tertiary association in semi closed marine environmental deposition. The geological condition in Indonesia does not favor such environment, therefore the salt deposits unlikely to occur. The saline solution in mud volcanoes in northern part of Java Island however indicates the possible saline deposits in Tertiary Kalibeng Formation with the thickness of approximatelly 3.000 meters. The saline seepages most probably have continuously been taking place since early Pleistocene or about a million years ago. The saline seepages in northern part of East Java might extend to thebottom of Madura Strait and enrich the salinity of the sea in the strait. The semi closed configuration of the strait contributes to the accumulation of salt. It is therefore suggested to expand the evaporating pools for salt production, among others by the reclamation of the shallow offshore area in the southern part of the island. Keywords: salt deficit, mud volcano, saline solution, enrich the salinity, solar evaporating pools
SOURCE ROCK EVALUATION BASED ON GEOCHEMICAL DATA AND 1D BURIAL HISTORY MODELLING IN X BLOCK, SOUTH SUMATERA BASIN Tiara Intan Dwi Putri; Dimas Pramudito; Yoga Andriana Sendjaja; Nisa Nurul Ilmi
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.v7i1.49020

Abstract

The study was conducted in the South Sumatra Basin using geochemical data consisting of three exploration wells to determine geochemical characteristics such as richness, quality, maturity, and the depositional environment of the source rock. Additionally, the study delved into the one-dimensional burial history of the study area. Subsequent phases of the research involved the analysis of three crude oil samples and three rock extract samples. This analytical process encompassed the utilization of gas chromatography (GC) and gas chromatography - mass spectrometry (GC-MS) data. By scrutinizing the biomarker parameters extracted through GC and GC-MS, the research sought to discern the specific characteristics of the depositional environment for each sample and establish a correlation between the source rock and the crude oil. Based on source rock evaluation, the three source rock wells are potential source rock. Based on biomarker analysis, TAN-1 and TAN-2 have an oxic terrestrial/fluvio-deltaic characteristics with a dominantly higher plant contributions. Samples RA-12, RA-17, and RA-61 have a suboxic – anoxic fluvio-deltaic characteristics with contributions of dominantly marine algae. The oil samples taken from these wells have a negative correlation with the source rock samples. Maturity analysis of the TAN-1, TAN-2, and TAN-3 wells is still in its immature phase based on one-dimensional burial history modeling.
LITHOLOGY UNITS PENGKOL AREA AND SURROUNDING, GUNUNG KIDUL DISTRICT, YOGYAKARTA PROVINCE. Reza Mohammad Ganjar Gani; Yusi Firmansyah; Rifky Nurdeani
Journal of Geological Sciences and Applied Geology Vol 4, No 2 (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.v4i2.31820

Abstract

The research area is located sub-district Nglipar,District of Gunnung Kidul,Yogyakarta Province. Accessibility to the research location by train Bandung - Yogyakarta, followed by a minibus to Nglipar District Gunung Kidul. Purpose Of this Research is to understanding geological conditions of the research area reviewed from litohologic units and  its stratigraphic order. The lithostratigraphy of the research area is divided into 3 lithologic units, Breccia Unit, Sandstone Unit and Limestone Unit. namely the naming of the rock units based on observable physical characteristics, including rock type, uniformity lithology symptoms and their stratigraphic position. Geological history at the location of this study is the eruption of Mount Ngalanggran and deposited volcanic breccia units. Early Miocene deposited units sandstone. At that time there was a decrease in sea level which caused the diagenesis of the sedimentary material into limestone material. On Middle Miocene limestone deposited. Keyword: Lithologic units, stratigraphic order, Gunung Kidul District.
GEOMORPHOLOGIC AND STRATIGRAPHIC DETERMINATION USING OUTCROP DATA, THIN SECTION AND MICROFOSSIL ANALYSIS IN BENTARSARI AREA, BREBES DISTRICT, CENTRAL JAVA Viska Triaraminta Dewi; Nurdrajat Nurdrajat; Yusi Firmansyah; Kurnia Arfiansyah Fachrudin
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.v2i6.20876

Abstract

Administratively, Bentarsari area was located in Salem Sub-District and Brebes District in Central Java Province with coordinate 108°46’45,15” - 108°49’28.29” BT - 108°39’32.4” BT and 7°7’40.34” LS - 7°10’22.22” LS.  This research aims is to give an understanding about geological condition in geomorphology and stratigraphy aspects which are described by thematic map in 1:12.500 scale within an area of 25km2. This research was accomplished with surface data (outcrop) and field orientation method using of GPS, geological compass, loop, geological hammer, comparator, and any other tools. Afterward, thin section and fossil analysis were also collected to determine the type of rocks and the age of the stratigraphy unit. This research will include the classification of geomorphology unit based on 3 aspects, which are morphography,  morphometry, and morphogenetic and also classification of stratigraphy unit, based on characteristics of rocks such as rock texture, mineral contents and fossil contents. The geomorphology of the Bentarsari region can be divided into 3 (three) geomorphological units, namely: the alluvium high altitude fluvial unit, high hills of steep structural sediments unit, and very steep high structural sedimentary hills unit. While the Litho-stratigraphic on research area divided into 4 (four) units, from the oldest to the youngest stratigraphy position is sandstone unit (Tbp), claystone unit (Tbl), fine-grained sandstone unit (Tpbph), and breccia unit (Qpbx). Thus, by having the result of this research, can be useful as a reference to have further studies in this located area. 
LITOFASIES ANALYSIS IN THE CIPAMINGKIS RIVER ROCK FORMATION JATILUHUR, BOGOR, WEST JAVA. Reza Mohammad Ganjar Gani; Yusi Firmansyah; Nurdrajat Nurdrajat; Muhammad Kayis Fathin
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.v5i3.38253

Abstract

The Sedimentary rocks result from the breakdown of previously transported rocks deposited and lithified. Sedimentary rocks cover almost 80% of the earth's crust (Folk, 1974). The research was conducted in the Cipamingkis River, Jonggol District, Bogor Regency, West Java. The research area is included in the Cianjur Regional Geological Map Sheet (Sudjatmiko, 1972) and is included in the Dayeuhkaum Earth Map (1209 – 233) published by the Geospatial Information Agency (BIG). The Jonggol District, Bogor Regency, West Java, has a large river, the Cipamingkis R,iver, stretching from the northeast to the southwest of the study area. This river is included in the Jatiluhur Formation (Sudjatmiko, 1972). The facies is a rock body with a different combination of physical, chemical and biological characteristics from the surrounding rock body, which reflects its original conditions, namely the way it was transported and the way it was deposited. Two bodies of rock deposited simultaneously have different facies if they have differences in their physical, chemical and biological characteristics. Units and sediment structure components in the study area are grouped into six lithofacies: (1) Thin-Medium Sandstone Layer, (2) Massive Claystone, (3) Alternating Sandstone and Claystone, (4) Thick Sandstone Layer, (5) Alternating Fine Sandstone and Very Fine Sandstone, and (6) Slump Deposit. Description of facies by limiting physical and chemical characteristics is called lithofacies, and lithofacies is a facies analysis method by considering information about physical and chemical characteristics of rock layers (Nichols, 2009).
THE LEVELS OF LEMBANG FAULT ACTIVITY BASED ON GEOMORPHIC INDEXES ON AROUND THE CIKAPUNDUNG WATERSHED, WEST JAVA Lola Lintang Syalsabilla; Iyan Haryanto; Emi Sukiyah
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.v4i1.28518

Abstract

Lembang Fault is a fault in the highlands of Bandung, which has an East-West direction with a length of about 29 km. This fault greatly affects the landscape around the Cikapundung watershed, especially in the upstream. An analysis performed using the geomorphic index; Basin Shape, Mount Front Sinuosity, Asymmetry Factor, T – Index, Ratio of Valley Floor Width to Valley Height, and Relative Tectonic Activity. Based on the analysis using methods above, the level of tectonic in the Cikapundung watershed ranges from active to low. The presence of Lembang fault affects landscape, forming zone that borders the Bandung highlands and the Subang area in the north.
Mapping the Level of Earthquake Risk of Holtekamp Bridge at Jayapura Based on Earthquake Data and Microtremor Measurement Doodle Dandy Waromi; Nur Khoirullah; Dicky Muslim; Agung Mulyo
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.v2i5.20321

Abstract

Holtekamp bridge which is located in Jayapura region between Hamadi and Holtekamp Village inthe Northern part of Papua island. The region constitutes an active earthquake zone with therecurrence frequency and magnitude of the earthquake are relatively high. The region is locatedon an active fault zone. The seismotectonics setting in this region is directly implied to thecalculations of the seismic design for engineering and design purposes on building and non-buildingstructures including Holtekamp bridge in Jayapura city. To recognize a characteristic of theearthquake at the site of interest, the historical earthquakes (background) data surrounding thestudy area. Local microtremor measurements data are analyzed by means of a probabilisticseismic hazard analysis (PSHA). Deterministic seismic hazard analysis (DSHA) using someground-motion models in attenuation relationship equations. In resulting of seismic hazardparameter as represented by peak ground acceleration (PGA), values in earthquake scenario atoperating basis earthquake (OBE), maximum design earthquake (MDE), and maximum credibleearthquake (MCE) conditions. These values are used as a reference to evaluate the complianceof the current technical aspects with the new required design facing the updated seismicityparameters.Keyword : Jayapura, Holtekamp, seismic Hazard Analysis, Peak Ground Acceleration.
ZONE OF GEOTHERMAL PROSPECTS BASED ON FAULT FRACTURE DENSITY (FFD) METHOD IN SUMANI REGION, WEST SUMATERA Resni Sasilani; Agus Didit Haryanto; Johanes Hutabarat; Dudi Hermawan; Sri Widodo
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.v3i2.22270

Abstract

The presence of geothermal manifestations in the form of hot springs is closely related to the presence of permeability zones in the Sumani geothermal system, West Sumatra. The permeable zone allows fluid circulation where meteoric water seeps to fill the reservoir and emerges on the earth's surface as a manifestation of hot springs. This study aimed to identify those permeable zones based on lineament density analysis using the Fault Fracture Density (FFD) method on ASTER GDEM satellite imagery. Lineaments in this case was assumed to be associated with fractures or faults in geothermal areas. The method was used to analyze the presence of lineament on topographic maps and to clarify all lineaments in the study area by adjusting the irradiation angle of 0°, 225°, 270°, and 315° at a constant altitude of 45°. From the FFD method, high lineament density values were found in the southwest of the study sites. The pattern of lineaments in the research area had northwest - southeast and southwest – northeast. The FFD analysis results were compiled with location of geothermal manifestations and geomorphological analysis which then showed positive results on the emergence of dominant hot springs depending on zones with high lineaments density and was located in the pyroclastic flow geomorphology unit with a difference in elevation between 500-1500 masl and slope of moderately steep to steep; indicating catchment area. Further research was needed to accurately understand about reservoir and the potential of geothermal reserves in the Sumani area.Keywords: Sumani Geothermal System, Fault Fracture Density, Geomorphological Analysis.
INTERPRETATION OF GAMMA RAY VALUE BASED ON OUTCROP DATA IN SIMPENAN AREA, REGENCY OF SUKABUMI Yusi Firmansyah; Reza Moh. Ganjar Gani; Aji Nurdrajat
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.v4i2.18234

Abstract

Natural radiation is the radiation that exists in nature in the form of cosmic radiation and the radiation is derived from the radioactive material present in the earth's crust (IAEA, 2003). This radionuclide is present in almost any material such as earth's crust, rocks, soil layers, seawater, building materials and human bodies of different levels. Generally these radiometric traces of an outcrop depend on the original rock that can be seen from petrology. The geological condition of Ciletuh in Sukabumi Regency is quite complex, seen from the structure of rocks, the characteristics of rocks, stratigraphy and also the landscape, thus making the area of Ciletuh interesting enough to serve as the location of research research in the field of Geology. Landslide disaster is one of the most common disasters in Indonesia. Based on data from the National Disaster Management Agency (BNPB) within the period of 2011-2014 there were 493 cases of landslides recorded in Indonesia. The potential of disaster and landslide vulnerability is a threat to the people of the Simpenan area, Sukabumi Regency which has geographical condition that is prone to landslide disaster. The purpose of this research is to know the distribution of Gamma Ray value in exposed rock and to see the relation of Gamma Ray value distribution with landslide prone area in research area. In the field observation, the lithology was 70% dominated by polymic breccia as well as 30% sandstone and claystone. The mean overall gamma ray value in the study area was 0.036 μSv / h. The landslide-prone areas in the study area have high gamma ray values and are located in areas with steep to steep slopes (8-35 °) where the reliefs are controlled by claystone lithology which has high potassium and thorium contents and is susceptible to weathering, erosion and prone to landslides. Keywords: Gamma Ray, landslide, Stratigraphy

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