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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 145 Documents
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OPTIMIZATION OF SLOPE GEOMETRY IN THE HIGHWALL SECTION A-A’ OF THE MAHAYUNG PIT, MUARA ENIM, SOUTH SUMATRA Zhafira, Zhafira; Zakaria, Zufialdi
Journal of Geological Sciences and Applied Geology Vol 9, No 2 (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.v9i2.70808

Abstract

Slope stability is a critical factor in open-pit mining operations that directly affects safety and production continuity. This study aims to evaluate the design safety factor of the Mahayung Pit for 2026 and to optimize the slope geometry of Highwall Section A–A' using the Morgenstern-Price limit equilibrium method with Mohr-Coulomb failure criteria under actual and fully saturated groundwater conditions. The evaluation results indicate that the slope does not yet meet the minimum safety factor threshold; therefore, optimization was performed by adjusting the slope geometry. This optimization yielded a minimum safety factor (SF) of 1.496 under saturated conditions, meeting the standard requiring SF ≥ 1.3. Consequently, this can serve as a basis for revising the Mahayung Pit design to support safer and more efficient mining operations.
GEOMORPHOLOGICAL ANALYSIS OF THE SUKAMULYA AND SURROUNDINGS AREA, LANGKAPLANCAR AND CIGUGUR DISTRICTS, PANGANDARAN REGENCY, WEST JAVA PROVINCE Ryonaldo Rizqi, Muhammad Ibrahim; Iskandarsyah, T. Yan Waliana Muda
Journal of Geological Sciences and Applied Geology Vol 9, No 2 (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.v9i2.69736

Abstract

Geographically, the Sukamulya and surroundings area, Langkaplancar and Cigugur subdistricts, Pangandaran Regency, West Java Province, are located at 108°30'9.44” E to 108°32'51.343” E and 7°33'42.896” S to 7°36'23.595” S. This study area is located in the South Mountain Zone of West Java, which is characterized by hilly relief and strong tectonic and volcanic influences. This study aims to identify geomorphological conditions and understand their formation processes based on morphographic, morphometric, and morphogenetic approaches. The research methods included spatial analysis or remote sensing using National Digital Elevation Model (DEMNAS) data and validation through geomorphological observations in the field. Several parameters were analyzed, including landform, river flow patterns, slope inclination, lithology, and the influence of geological structures. The results show that the study area is dominated by hills with altitudes between 115 and 436 meters above sea level and slope gradients ranging from 13 to 55%. The drainage patterns that developed were rectangular and subparallel, indicating the control of geological structures and slope inclination on the development of the drainage system. The geomorphological characteristics in the study area were divided into three units, namely the Slightly Steep Structural Hills Unit, the Steep Structural Hills Unit, and the Steep Volcanic Hills Unit. Generally, landscape forming in the study area is controlled by the interaction of endogenous processes such as tectonic activity and volcanism, as well as exogenous processes such as erosion and weathering. This study provides to contribute to the fields of geology and geomorphology, serve as a basis for land use planning, and inform further studies on potential geological hazards such as landslides.
Geomorphology, Lithostratigraphy, and Structural Influence on Karst Landscape Evolution in the Selasari Area, Southern West Java Maheswara, Ahmadani; Barkah, M. Nursiyam; Listiawan, Yudhi; Dwi Hadian, M. Sapari
Journal of Geological Sciences and Applied Geology Vol 9, No 2 (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.v9i2.70530

Abstract

This study investigates the geomorphological characteristics and geological evolution of the Selasari area, Southern West Java, with emphasis on the interaction between lithostratigraphy, tectonic evolution, and karst landscape development. The objectives are to characterize the geomorphological and lithostratigraphic framework, analyze structural control on landscape development, and reconstruct the geological evolution of the area. An integrated approach combining morphographic, morphometric, morphogenetic, lithostratigraphic, and structural characterization from DEM-based interpretation and field observations was applied. The study area is characterized by karst low hills developed on carbonate-dominated lithologies deposited in a shallow marine environment during the Middle–Late Miocene. Structural analyses suggest a dominant NW–SE orientation that may influence drainage development and valley alignment, possibly associated with tectonic activity related to regional subduction processes along southern Java and subsequent uplift during the Plio–Pleistocene. The integration of geomorphological, lithostratigraphic, and structural evidence suggests that the geological evolution of the study area records a transition from shallow marine carbonate deposition to a tectonically uplifted karst terrain. These findings contribute to a better understanding of karst landscape evolution in the Southern Mountains of Java and highlight the importance of integrated geological approaches for understanding structurally controlled karst systems and supporting geological mapping.
SOURCE ROCK CHARACTERISTICS AND THERMAL MATURITY IN JAMBI SUB-BASIN, SOUTH SUMATRA BASIN Ambari, Wardahrose Dhifa; Ilmi, Nisa Nurul; Sunardi, Edy
Journal of Geological Sciences and Applied Geology Vol 9, No 2 (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.v9i2.70656

Abstract

The Jambi Sub-Basin, located within the South Sumatra Basin, represents one of the prospective hydrocarbon-bearing areas in Indonesia due to the presence of organic-rich syn-rift and post-rift sedimentary sequences and a well-developed petroleum system. This study aims to evaluate source rock characteristics and hydrocarbon generation potential of several stratigraphic interval in the Jambi Sub-Basin using Total Organic Carbon (TOC) and Rock-Eval Pyrolysis data obtained from fourteen wells in the study area. The analyses were conducted to assess the quantity, quality, and thermal maturity of organic matter within the source rocks. The results indicate that the Lower Talang Akar Formation (LTAF) and Upper Talang Akar Formation (UTAF) could become the most prospective source rock intervals, characterized by moderate to excellent TOC values with S2 values ranging from poor to excellent generative potential. Organic matter is primarily composed of type II-III kerogen, indicating dominant terrestrial organic matter input deposited in fluvia-deltaic to marginal lacustrine environment, with the capability to generate mixed gas and oil hydrocarbons. Hydrogen Index (HI) values range from 14 to 561 mg HC/ g TOC, reflecting variable organic matter quality and depositional conditions across the basin. Thermal maturity parameters, including Tmax and vitrinite reflectance, indicate maturity levels ranging from immature to post mature stages. The Talang Akar intervals generally show higher maturity levels associated with deeper burial and prolonged thermal evolution, suggesting active hydrocarbon generation, particularly gas generation in the deeper areas. The integration of organic richness, kerogen type, and maturity distribution suggests that the LTAF represents the principal gas-prone source rock within the study area, while several intervals still has their oil-generation potential. This study could provide an integrated organic geochemical framework for evaluating source rock distribution in the Jambi Sub-Basin and contribute to the improvement of future hydrocarbon exploration strategies in the South Sumatra Basin.Keyword: source rock, Rock-Eval Pyrolysis, Talang Akar Formation, Thermal Maturity, South Sumatra Basin
STRATIGRAPHIC ANALYSIS AND DISTRIBUTION OF ROCK UNITS IN THE CIPATAT AREA, WEST BANDUNG REGENCY, WEST JAVA PROVINCE, INDONESIA Margereta, Natasya; Haryanto, Iyan; Abdurrokhim, Abdurrokhim
Journal of Geological Sciences and Applied Geology Vol 9, No 2 (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.v9i2.70736

Abstract

Geological mapping of the Cipatat area, West Bandung Regency, West Java Province was conducted at a scale of 1:12,500 to establish the stratigraphic succession, spatial distribution of rock units, and structural configuration of the region. Three rock units were identified spanning the Late Oligocene to Quaternary: the Rajamandala Limestone Unit (TOMBG), the Citarum Sandstone Unit (TMBP), and the Quaternary Volcanic Unit (QV). The Rajamandala Limestone, deposited in a shallow neritic carbonate platform, is biostratigraphically constrained to zones Te3–Tf1 based on larger foraminifera including Lepidocyclina, Operculina, Miogypsina, and Cycloclypeus, while petrographic analysis confirms mudstone to packstone facies. The overlying Citarum Sandstone Unit represents a deep-marine turbidite system characterized by graded bedding, parallel lamination, and load casts defining a Bouma sequence dominated by the Tb facies, with foraminifera assemblages assigning deposition to Middle Miocene zones N5–N9 and reflecting progressive basin deepening from neritic to bathyal conditions. Petrographic analysis of the sandstone further supports classification as volcanic-derived lithic wacke, consistent with a volcanogenic provenance. The Quaternary Volcanic Unit unconformably caps the sequence, marking a shift from marine sedimentation to subaerial volcanism. Structural analysis reveals three major fault systems — the Cibuntu, Cibrengkok, and Cilimus River Faults — developed under a northwest–southeast compressional regime attributed to Miocene–Plio-Pleistocene Sunda Arc convergence, generating west–east-trending fold pairs that govern the present ridge-valley morphology and lithological distribution across the study area

Page 15 of 15 | Total Record : 145

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