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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 140 Documents
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GEOMORPHOLOGICAL FEATURES OF SIDAMULYA, SUKABUMI REGENCY, CILETUH PALABUHANRATU UGG PUTRI, NISRINA NADELLIA; Pratiwi, Santi Dwi; Rosana, Mega Fatimah
Journal of Geological Sciences and Applied Geology Vol 8, No 2 (2025): 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.v8i2.60948

Abstract

The Sidamulya region, located in the Ciracap Subdistrict of Sukabumi Regency, forms part of the Ciletuh Palabuhanratu UNESCO Global Geopark (UGG) and exhibits unique geomorphological features influenced by geological structures and surface processes. This study focuses on analyzing the area’s geomorphology through morphographic, morphometric, and morphogenetic aspects using Digital Elevation Model (DEM) data processed via ArcGIS and field verification. The research identifies five geomorphological units, including denudational and volcanic hills with varying slope gradients, drainage patterns, and lithological compositions. These units are shaped by exogenic processes such as erosion, weathering, and sedimentation, with lithologies including sandstone, breccia, and andesitic-basaltic lava. The thematic maps produced from this study provide valuable insights into the region’s landscape evolution and contribute to sustainable management within the geopark area. Keyword: Sidamulya, Morphography, Morphometric, Morphogenetic, Geomorphology
Thermogenic Hydrocarbon Potential on Two Drop Cores Samples from The Surface Geochemical Exploration Program in The Offshores Area of Yamdena Basin, Tanimbar Islands Ilmi, Nisa Nurul; Sunardi, Edy
Journal of Geological Sciences and Applied Geology Vol 8, No 2 (2025): 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.v8i2.61562

Abstract

Seepage of hydrocarbons in near-surface sediments can be categorized into micro and macro seepage, controlled by complex geological, geochemical, and biological processes. Surface geochemical exploration programs have been widely employed to detect and analyze geochemical anomalies on the Earth's surface, which could indicate the presence of subsurface mineral or hydrocarbon deposits. This study aims to characterize two drop core samples extracted from the Yamdena Basin through organic geochemical and isotopic analysis to assess the potential for thermogenic hydrocarbons in the region. A quantitative approach was adopted, utilizing geochemical data, including stable carbon isotope analysis and organic geochemical evaluation through Gas Chromatography (GC) and Gas Chromatography-Mass Spectrometry (GC-MS). The samples analyzed consisted of two piston cores collected during a surface geochemical program conducted by TDI-Brooks International, Inc. This study relies on data from a previous TDI-Brooks International, Inc. survey, with data licensed from TGN-NOPEC Geophysical Company through the Migas Data Repository (MDR) – Pusdatin, focusing on the organic geochemical characterization of drop core samples from offshore Tanimbar Islands. The results indicate that Sample#1 and Sample#2 samples were deposited in a marine setting with varying terrestrial input and exhibited a low maturity level. Geochemical signatures reveal the presence of immature land-plant lipids, suggesting a low potential for thermogenic hydrocarbon generation. The findings highlight the value of surface geochemical exploration programs in mapping hydrocarbon prospects in frontier areas. Furthermore, detailed geochemical analyses can provide insights into the sources and potential of hydrocarbons, aiding in future exploration strategies.
LITHOLOGY UNITS WANAJAYA AREA AND SURROUNDING, BUAHDUA SUBDISTRICT, SUMEDANG DISTRICT, WEST JAVA PROVINCE Ganjar Gani, Reza Moh; Firmansyah, Yusi; Arfiansyah, Kurnia; Efendi, Tri Septanto; Rodhiya, Azzam Robbi
Journal of Geological Sciences and Applied Geology Vol 8, No 2 (2025): 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.v8i2.61082

Abstract

The research site is located in Wanajaya Village, Buahdua Subdistrict, Gunung Kidul Regency, West Java Province. Accessibility to the research location using a motorbike. The purpose of this study is to determine the geological conditions of the study area in terms of lithological units and stratigraphic order. The lithological unit of the study area is divided into 4 lithological units, namely the Mudstone Unit, the Andesite Intrusion Unit, the Volcanic Breccia Unit and the Andesite Lava Unit, namely the naming of rock units based on observable physical characteristics, including rock type, uniformity of lithological symptoms and stratigraphic position. The geological history of the first research site in the Late Miocene to Early Pliocene time was deposited by the mudstone unit. In the late Pliocene to Pleistocene volcanism activity occurred due to the displacement of the volcanic centre from the south to the centre of Java (Martodjojo, 1984) which caused the formation of the wanajaya fold and continued with the formation of the wanajaya ascending fault. As a result of the weak fault zone, the andesite intrusion unit appeared, which was the beginning of the activity of the old volcano. In Pleistocene time, namely deposition of Volcanic Breccia Unit and continued by the deposition of andesite lava unit due to volcanism activity of Tampomas volcano issued pyroclastic material.
GEOLOGICAL EVOLUTION OF OLIGOCENE TO PLEISTOCENE LEBAKSIUH, WEST JAVA, INDONESIA Sandyputra, Adryan Ridho; Sunardy, Edy; Ilmi, Nisa Nurul
Journal of Geological Sciences and Applied Geology Vol 9, No 1 (2026): Journal of Geological Sciences and Applied Geology
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study intends to map and analyze the geological conditions in Lebaksiuh, Sidamukti, and the surrounding area of Sumedang and Majalengka Regencies, West Java, Indonesia. The methods used include field observation, laboratory analysis, and literature review. The geomorphological units comprises steep high volcanic uplands, steep high structural uplands, steep low structural hills, and gently sloping denudational lowland, with sub-dendritic, radial, and modified trellis drainage patterns occupying most of the area. Field observation data shows that the area consists of 5 lithostratigraphic units which are the andesite Unit (HA), claystone Unit (NMCSH), sandstone Unit (NPCS), tuff Unit (NPCT), and alluvium unit (Qa). The geological evolution that starts with the formation of the Oligocene andesite unit (HA). Then deposition of the Cinambo shale unit (NMCSH) in early Miocene with a deep marine depositional environment, then an Intra-Miocene tectonic activity compresses the region, followed by a compressional release in the Miocene-Pliocene age and sea regression phase that shaped the local basin. In the Pliocene, Citalang sand (NPCS) and tuff unit (NPCT) are deposited in a fluvial depositional environment. Reactivation of the older faults happened after the deposition. lastly accumulation of the alluvium unit (QA) in the Quaternary Holocene age. Structural geology plays a huge role in the area with a regional thrust fault that divides the Citalang and Cinambo formation in the south which showed an arcing pattern that opens to the north, and a more local fold structure that arced mostly in north-south direction, and fault structures present in the citalang formation. Potential geological resources in the area are Sand and andesite, and can be used for building material. Contrastingly, the geological hazards include landslides and earthquakes.
SPATIAL DISTRIBUTION OF GEOMORPHOLOGICAL UNITS IN THE GUNUNGSUNGGING AREA, SUKABUMI REGENCY, WEST JAVA Priyayi, Mitra; Pratiwi, Santi Dwi
Journal of Geological Sciences and Applied Geology Vol 9, No 1 (2026): Journal of Geological Sciences and Applied Geology
Publisher : Universitas Padjadjaran

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Abstract

The geomorphological landscape of southern Java has developed through long-term interactions between tectonic activity, lithological diversity, and surface processes related to the convergence of the Eurasian and Indo-Australian plates. One of the regions that records this complex evolution is the Ciletuh–Jampang area, which displays a variety of landforms associated with uplifted terrains and differential erosion. This study focuses on the Gunungsungging area, Sukabumi Regency, West Java, with the objective of identifying geomorphological characteristics and defining geomorphological units based on landform attributes and lithological control. Geomorphological analysis was conducted using an integrated approach combining morphographic, morphometric, and morphogenetic methods. Digital elevation data derived from SRTM were processed using ArcGIS and Global Mapper, and the results were validated through systematic field observations. Morphographic analysis indicates that the study area is dominated by low hill landforms with elevations generally ranging between 50 and 175 m above sea level. The drainage system exhibits two primary patterns: parallel drainage, developed on moderate slopes and elongated ridges, and dendritic drainage, commonly associated with more homogeneous lithology and gentler slopes. Morphometric analysis reveals that flat to gently sloping terrain (0°–4°) predominates across the study area, with steeper slopes occurring locally. Morphogenetic interpretation suggests that exogenous processes, particularly weathering and dissolution, play a dominant role in shaping the landscape, while the influence of tectonic activity is relatively limited, as evidenced by minimal structural deformation. Karstification features, including caves and dissolution forms, are well developed within limestone unit. Based on the integration of geomorphological parameters, the study area is divided into three geomorphological units: gently sloping structural low hills, gently sloping denudational low hills, and gently sloping karst low hills. These results contribute to a better understanding of landscape development in the Ciletuh region and provide a geomorphological framework for further geological and environmental studies.
THE INFLUENCE OF SEDIMENTATION ON SALINITY VARIATION IN THE EAST KUTAI BASIN, EAST KALIMANTAN, INDONESIA Yuniardi, Yuyun; MOHAMAD, FEBRIWAN; Alfadli, Muhammad Kurniawan
Journal of Geological Sciences and Applied Geology Vol 9, No 1 (2026): Journal of Geological Sciences and Applied Geology
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v9i1.69433

Abstract

The East Kutai Basin is a major deltaic system developed under strong river-dominated sedimentary processes, characterized by long-term progradation from marine to terrestrial environments. In such deltaic settings, salinity distribution is generally expected to show systematic lateral and vertical trends, with freshwater dominating proximal facies and saline water occurring in distal marine facies, while salinity commonly increases with depth due to depositional progradation through time. This study investigates lateral and vertical salinity variations in the East Kutai Basin and evaluates their relationship with sedimentary facies distribution. Salinity data were derived from both formation water analysis and apparent water resistivity (Rwa) calculations using resistivity logs based on Archie’s equation. These data were integrated with net sand maps and electrofacies interpretations to analyze salinity patterns across multiple stratigraphic layers. The results indicate that although the general lateral salinity trend from low salinity in channel facies to higher salinity in mouth bar facies is preserved, significant anomalies are present. Laterally, mouth bar deposits locally exhibit unexpectedly low salinity values, approaching those of channel facies. Vertically, salinity decreases with increasing depth in several stratigraphic groups, contradicting the expected progradational model. These anomalies are interpreted to result from lateral shifting of depositional environments due to progradation and expulsion of low-salinity compaction water from overpressured prodelta shale into adjacent sand bodies.
MIDDLE MIOCENE TO HOLOCENE GEOLOGICAL HISTORY AND POTENTIAL OF BABAKAN JAWA AREAS, MAJALENGKA DISTRICT OF WEST JAVA-INDONESIA Ambari, Wardahrose Dhifa; Sunardi, Edy; Ilmi, Nisa Nurul
Journal of Geological Sciences and Applied Geology Vol 9, No 1 (2026): Journal of Geological Sciences and Applied Geology
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v9i1.69279

Abstract

Geological mapping activities were conducted in the Sidamukti, Babakan Jawa, Cibodas areas and surroundings, Majalengka District, West Java Province. The main objective of this research is to determine the geomorphological characteristics, lithology, geological structures, and geological potential in the research area. The methods used include field observations, laboratory analysis, interpretation of topographic maps and satellite imagery, as well as structural analysis using stereonet. The research results show that the geomorphology of the study area was formed by the interaction of endogenic forces (tectonic and volcanic) and exogenic forces (weathering and erosion), resulting in five main geomorphological units. The stratigraphy of the area consists of five rock units composed of claystone units from the Middle Miocene to Holocene alluvial deposits. The developed geological structures indicate the influence of extensional stress with a strike-slip component that forms normal faults and reverse faults trending northwest–southeast. The geological potential of the area includes resources such as andesite stone, sand, and gravel, as well as the geotourism potential of Taman Gunung Batu Karang. On the other hand, steep hilly areas with weathered lithology show vulnerability to mass movements, making them landslide-prone areas. The results of this mapping are expected to serve as a basis for sustainable natural resource management and geological disaster mitigation.
GEOLOGY OF KADU AND SURROUNDING AREA, JATIGEDE AND JATINUNGGAL DISTRICTS, SUMEDANG REGENCY, WEST JAVA PROVINCE Alvionita, Azizah Tiara; Sunardi, Edy; Ilmi, Nisa Nurul
Journal of Geological Sciences and Applied Geology Vol 9, No 1 (2026): Journal of Geological Sciences and Applied Geology
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v9i1.69203

Abstract

Administratively, the research area is located in Kadu and its surrounding areas, Jatigede and Jatinunggal Districts, Sumedang Regency, West Java Province. This study aims to determine the geological conditions and geological history of the research area. The research method consists of three stages: literature study, field observation for data collection, and studio observation combined with laboratory analysis. Based on geomorphological aspects, the research area is divided into three geomorphological units, namely moderately steep denudational low hills, steep structural elongated hills, and very steep structural sedimentary hills. Field observations indicate that the lithostratigraphic units are grouped into four units arranged from oldest to youngest: claystone unit (Sbl), sandstone unit (Sbp), tuff unit (St), and volcanic breccia unit (Sbv). The claystone and sandstone units were deposited simultaneously during the Middle Miocene in a deep marine environment. Subsequently, during a slightly younger period, the tuff unit (St) was deposited conformably with the sandstone unit. Geological structures developed in the study area include anticline and syncline folds formed in the Late Miocene due to compressional tectonic activity, with the principal stress direction trending northeast–southwest. Other structures such as joints and indications of strike-slip faults are also observed. The volcanic breccia unit (Sbv) was deposited from ancient volcanic eruptions in a disconformable relationship with the claystone unit (Sbl) during the Late Pliocene. Geological resources in the study area include andesite quarrying as well as tourism potential at Mount Jagat and the Pine Forest. The main geological hazard in the area is landslides.
GEOMORPHOLOGY OF CISEWU AREA AND ITS SURROUNDINGS, GARUT REGENCY, WEST JAVA, INDONESIA Zulfi, Damar Sayyidina; Sukiyah, Emi
Journal of Geological Sciences and Applied Geology Vol 9, No 1 (2026): Journal of Geological Sciences and Applied Geology
Publisher : Universitas Padjadjaran

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Abstract

This study analyzes the geomorphological phenomena of the Cisewu area and its surroundings, Garut Regency, West Java, through an integrated approach encompassing morphographic, morphometric, morphogenetic, and morphotectonic was used to analyze landforms as a basis for establishing geomorphological units. The methods used included mapping the earth's surface, Digital Elevation Model (DEM) analysis, slope gradient measurement, drainage pattern interpretation, and lineament analysis. The results identify five main geomorphological units, namely: (1) Andesite Intrusive Dome, (2) Very Steep Structural Valley, (3) Moderately Steep Volcanic Valley, (4) Steep Volcanic Ridge, and (5) Very Steep Structural Ridge. Morphometric analysis shows the dominance of steep (16°–35°) to very steep (>35°) slopes, reflecting strong control by geological structures and resistant lithology. Rectangular and trellis drainage patterns indicate control by fault and joint structures. Morphotectonic analysis using geomorphic indices (Bs, Vf, Af, Smf) indicates ongoing Quaternary tectonic activity, particularly in the Cilayu Sub-Watershed. The formation of these geomorphological units is the result of the interaction between volcanism during the Late Miocene–Pliocene and tectonic deformation by northeast–southwest-trending strike-slip faults. The results of this study provide a scientific basis for land-use planning and landslide hazard mitigation in the study area.
GEOMORPHOLOGICAL CHARACTERISTICS OF THE PASIRPANJANG AREA AND ITS SURROUNDINGS, CIRACAP, CILETUH, SUKABUMI DISTRICT, WEST JAVA PROVINCE Fibrian, Achmad Viki; Pratiwi, Santi Dwi
Journal of Geological Sciences and Applied Geology Vol 9, No 1 (2026): Journal of Geological Sciences and Applied Geology
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v9i1.69201

Abstract

The study site is considered in the Pasirpanjang and its environs area of Ciracap District, Sukabumi Regency, West Java which has a geomorphologic diversity that could be affected by endogenic and exogenic processes. Therefore, the objectives of this study are to determine the geomorphological features of the area by using morphographics, morphometrics and morphogenetic aspects. We analysis DEM, obtain field data and a review of literature is made. Morphographic analysis consists of landforms and river flow patterns, morphometric analysis includes slope gradients and morphogenetic anlayisis arranges lithology, geological structure and river flow patterns. Study result indicates truly cartographic aspects of the terrain are two types: low hills and high hills; subdendritic and rectangular patterns with changes in slopes ranging from gentle to steep. The geology in the region of the outer rim is caused by tectonic and volcanic activity, as well as exterior weathering and erosion still occurring. The study area is divided into three major geomorphological units depending on combination of these 3 geomorphologic attributes. The findings contribute to a significant geomorphological interpretation that can serve as an important reference for land use planning and mitigation of potential geomorphologic disasters, as well as the advancement of applied geological researches in the Ciracap area and its adjacent locations.

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