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Analisis Batuan Berdasarkan Petrografi Daerah Mehanggin dan Sekitarnya, Kabupaten OKU Selatan, Sumatera Selatan Ananda Giselle Putri Ianuar; Idarwati
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 6 No. 4 (2025): November
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v6i4.1443

This study aims to assess the petrological and petrographic characteristics of the Mehanggin area and its surroundings, South Ogan Komering Ulu (OKU) Regency, South Sumatra. The research site covers an area of ±27 km² with lithological complexity in the form of igneous, pyroclastic, sedimentary and metamorphic rocks. The methods used include surface geological mapping, megascopic petrological analysis, and petrographic analysis using thin sections with a polarizing microscope. The results showed the presence of ten lithostratigraphic units, namely Phyllite, Andesite, Chert, Granite, Conglomerate, Sandstone, Limestone, Carbonate Sandstone, Clay, and Tuff. Further petrographic analysis identified each unit as Semipelite (Phyllite), Andesite, Chert, Monzo-granite, Arkose, Subarkose, Framestone, Unsorted Biosparite, Mudrock, and Vitric Tuff. These findings reflect the diversity of lithologies and geological processes that shaped the study area, while contributing to the understanding of the geological evolution of the South Sumatra Basin.

Mekanisme Struktur Geologi Daerah Lengkong dan Sekitarnya Kabupaten Sukabumi, Provinsi Jawa Barat idarwati; Amarlin, Andreas Adriel
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 6 No. 4 (2025): November
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v6i4.1530

The Lengkong area, located in Sukabumi Regency, West Java Province, exhibits a complex geological structure. However, comprehensive studies related to structural geology in this area have not yet been conducted, thus requiring a more detailed geological understanding. The methods employed include field observations, measurement of rock layer orientations, and stereographic analysis to determine the kinematics and dynamics of deformation.The results of the study reveal the presence of three main structures: the Tegallega Anticline, the Neglasari Syncline, and the Neglasari Strike-Slip Fault. The anticline and syncline folds were formed during a compressional tectonic phase in the Plio–Pleistocene, oriented northwest–southeast, and are classified as Steeply Inclined Folds. Meanwhile, the Neglasari Fault developed during the Pleistocene as a response to northeast–southwest–oriented compressional stress, and is categorized as a Strike-Slip Dominated Fault with a Reverse Left-Slip movement type.The structural mechanisms were analyzed using the wrench fault concept, in which the folds are considered first-order structures and the faults as second-order structures. Overall, the regional north–south compressional deformation has controlled the formation of both faults and folds, while also influencing the geometry of the carbonate sandstone layers of the Lengkong Formation

Analisis Zona Rawan Bencana Tanah Longsor Metode Fuzzy Analytical Hierarchy Process (FAHP). Studi Kasus : Daerah Bukit Bual dan Sekitarnya, Kabupaten Sijunjung dan Kota Sawahlunto, Provinsi Sumatera Barat Borinsky, Arya Danendra; Idarwati
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 6 No. 4 (2025): November
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v6i4.1411

Landslides are a significant hydrometeorological threat in Indonesia, particularly in the West Sumatra Province. This research aims to map landslide hazard zones in the Sawahlunto and Tanah Datar regions by integrating the Fuzzy Analytical Hierarchy Process (FAHP) and Geographic Information System (GIS) methods. The FAHP method was utilized to determine the relative weights of four main landslide-inducing parameters: slope, rainfall, land cover, and soil type. Spatial data for each parameter were then analyzed using a weighted overlay technique within the GIS platform to produce a landslide susceptibility map. The FAHP analysis results indicate that slope and rainfall have the most significant influence with weights of 29.86% each, followed by land cover at 29.76%, and soil type at 10.52%, with a consistency ratio (CR) of 0.0006975 signifying a consistent assessment. Based on the spatial analysis, the study area is classified into three susceptibility zones: low, medium, and high. The high-susceptibility zones are generally found in areas with slope gradients >40%, and land cover dominated by rice fields, agricultural fields, plantations, and settlements, despite being characterized by sedimentary soil types and moderate rainfall categories. Conversely, low-susceptibility zones are characterized by gentle slopes (0-2%) and swamp land cover. The findings of this study are expected to provide a scientific basis for local governments in formulating effective disaster mitigation strategies and spatial planning to reduce future risks.

Penentuan Lingkungan Batimetri Formasi Baturaja dan Formasi Gumai, Daerah Negeribatin dan Sekitarnya, Kabupaten Ogan Komering Ulu Selatan, Sumatera Selatan Margareta, Hemalia; Idarwati
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 1 (2026): Februari
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i1.1673

The Negeribatin area, Ogan Komering Ulu Selatan Regency, South Sumatra Province, is part of the South Sumatra Basin and is composed of Tertiary sedimentary rock units, particularly the Baturaja Formation and the Gumai Formation. This study aimed to determine and reconstruct the bathymetric environments of these two formations based on lithological characteristics and the types of benthic foraminifera. The research methods included field observations and laboratory paleontological analyses involving rock sample preparation, sieving, and identification of benthic foraminifera using a microscope. The interpretation of bathymetric environments was conducted based on the depth range of benthic foraminifera habitats. The results show that the Baturaja Formation is composed of calcarenite limestone and reef limestone, indicating a marginal to middle neritic depositional environment at depths of approximately ±14–183 m. Meanwhile, the Gumai Formation, composed of sandstone and claystone, indicates a transitional to middle neritic depositional environment with a depth range of approximately ±12–183 m. The transition from carbonate rocks to clastic rocks reflects an increase in depositional depth related to the development of geological structures in the area. This study contributes to a better understanding of the evolution of depositional environments and sedimentary systems in the South Sumatra Basin.

Karakterisasi Petrografi dan Klasifikasi Litologi Batuan pada Daerah Umpam dan Sekitarnya, Kecamatan Lengkiti, Kabupaten Ogan Komering Ulu, Sumatera Selatan Khatulistiwa, Bening Alya; Idarwati
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 1 (2026): Februari
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i1.1681

The Umpam area and its surroundings, Lengkiti District, Ogan Komering Ulu Regency, South Sumatra, are located within the South Sumatra Basin and exhibit complex lithological variations. This study aimed to characterize rock types petrographically and to establish lithological classifications as a basis for more accurate rock nomenclature. The research methods included field observations, sample collection, thin section preparation, and petrographic analysis using a polarizing microscope under plane-polarized light (PPL) and cross-polarized light (XPL). The petrographic analysis of 12 samples revealed lithologies consisting of calcareous pelite (slate) and metacarbonate rock (phyllite) within the Tarap Formation (PCt); chert within the Situlanglang Member (Kjgs); chert and andesite within the Insu Member of the Garba Formation (KJgv); lithic tuff, andesite, and basalt within the Kikim Formation (Tpok); ferruginous lithic wacke within the Talang Akar Formation (Tomt); and wackestone limestone within the Baturaja Formation (Tmb). The Gumai Formation (Tmg) is also characterized by calcareous mudrock and wackestone. Overall, the study area is composed of metamorphic, igneous, pyroclastic, and sedimentary rocks, reflecting the diversity of geological processes that have occurred in the region.

Analisis Geomorfologi Daerah Jampang Tengah dan Sekitarnya, Kabupaten Sukabumi, Provinsi Jawa Barat Arsyad, Muhammad Astridho; Idarwati; Salni, Muhammad Alfath Salvano
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 1 (2026): Februari
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i1.1686

The geomorphological analysis of the Jampang Tengah area, Sukabumi Regency, West Java, aims to identify the ongoing geomorphological processes and geomorphic units within the study area. Based on its geographical location, the study area is part of the Bogor Basin, which is characterized by relatively unique geological settings in terms of stratigraphy, geological structure, and geomorphology. The geomorphic units were identified through several aspects, including morphological (physical) aspects consisting of morphography and morphometry, as well as morphodynamic aspects. The research was conducted using field observation methods and studio analysis based on Geographic Information Systems (GIS). The research process began with preliminary identification through the interpretation of Digital Elevation Model (DEM) data, which was correlated with field features through direct observations from various strategic points. Supporting phenomena were described and measured to collect geomorphological data. The identified geomorphic units in the study area include Highly Eroded Denudational High Hills, Moderately Eroded Denudational High Hills, Fault Zone High Hills, Synclinal Hills, and Karst Hills. These geomorphic units can be utilized as information for further studies, disaster mitigation support data, and regional development planning.

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