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All Journal Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal)
Idarwati
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Agriculture, Biological Sciences & Forestry Chemistry Education Physics

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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

Abstract

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

Abstract

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
Co-Authors Amarlin, Andreas Adriel Ananda Giselle Putri Ianuar