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Yogie Zulkurnia Rochmana
Teknik Geologi Universitas Sriwijaya
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Karakteristik Petrografi Batupasir Formasi Sangkarewang Daerah Talawi, Kota Sawahlunto, Sumatera Barat Ahmad Hafiz Nurmansyah; Budhi Setiawan; Yogie Zulkurnia Rochmana
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 3 (2026): August
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i3.2571

Abstract

The Sangkarewang Formation is one of the Paleogene sedimentary units within the Ombilin Basin that developed in a lacustrine depositional system. Previous studies of the Sangkarewang Formation have mainly focused on stratigraphy, organic geochemistry, and depositional environment interpretation, while detailed investigations of the petrographic characteristics of its sandstone facies remain limited. This study aims to identify the petrographic characteristics of Sangkarewang Formation sandstones based on texture, mineral composition, porosity type, and sandstone classification. Three representative sandstone samples (BPSRG-01, BPSRG-02, and BPSRG-03) were analyzed using thin-section petrography under a polarizing microscope. The results show that the sandstones consist of very fine- to coarse-grained sediments with poor sorting and angular to sub-angular grains. The mineral composition is dominated by quartz, feldspar, and volcanic lithic fragments, indicating a contribution from volcanic-derived materials. Based on sandstone classification, samples BPSRG-01 and BPSRG-03 are classified as Arkosic Arenite, whereas BPSRG-02 is categorized as Feldspathic Wacke due to its higher matrix content. Intergranular porosity is observed in all samples, with variations controlled by grain packing and matrix abundance. These characteristics indicate that the Sangkarewang Formation sandstones were derived from relatively proximal sediment sources and experienced variations in sediment supply and depositional energy within a dynamic lacustrine system.
Co-Authors A. F. H. Surbakti` Abimanyu, Gilang Adamsyah, Bayu Ahmad Hafiz Nurmansyah Alpino, Muhammad Anisa Nurjanah, Anisa Anton Wijaya Apriliana, Vira Armandani, Aditya Raihan Atthoriq, Muhammad Hafidz Aulia, Khanaya Syafarah Az zahra', Salmaa Aulia Az-zahra, Salmaa Aulia Budhi Setiawan Budhi Setiawan Budhi Setiawan Budhi Setiawan Chen, R. D. Daffa Gamas Elcofa Dyah Hastuti, Endang Wiwik E. W. D. Hastuti Elisabet Dwi Mayasari Endang Wiwik Dyah Hastuti Endang Wiwik Dyah Hastuti Erisendy, Maretha Deva Ersyari, J. Febi Annisa Felix Mateus Exaudi Gultom Giantaria, Anisa Harfiandri, Muhammad Said Harnani Harnani Harnani Harnani Hastuti, E. W. D. Helen Dwi Putri Hibatullah, Kevin Nabil Idarwati Idarwati Ismaryanto, Ismaryanto J. Ersyari Kevin Nabil Hibatullah Lestari, Suci Febria M Arief Situmorang M. Puspita M. Rafi Maretha Deva Erisendy Muhammad Aghil Ikhwanulsyah Muhammad Akmal Dwi Antoro Muhammad Al Fajrin Khalil Gibran Muhammad Alfath Salvano Salni Muhammad Alif Setiawan Muhammad Daffa Kevin Adam Muhammad Hafidz Atthoriq Muhammad Raihan Mustaqim Muhammad Said Harfiandri Novita, A. F. Permana, Lano Adhitya Pranata, Ridho Putra, Hanif Kurniadi Putri, Helen Dwi R. D. Chen R. G. Utamaputra Rahmatullah, Arif Ramadan, Ikdan Rifki Muhamad Ridho Pranata Riezal Arieffiandhany Rizqi Wahyu Pratama Salma Aulia Az-zahra Stevanus Nalendra Jati Sunarta, Jonathan Angkawijaya Sundus Ghaida Noor Azizah Surbakti`, A. F. H. Utamaputra, R. G. Wicaksono, M Dwiki Satrio Wicaksono, M. Dwiki Satrio