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All Journal Bulletin of Scientific Contribution : Geology Journal of Geoscience, Engineering, Environment, and Technology Journal of Geosciences and Applied Geology
Kurnia Arfiansyah, Kurnia
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science Physics

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KARAKTERISTIK BATUAN SEDIMEN PADA FORMASI BENTANG DI DAERAH GUNUNG SUNGGING, KABUPATEN SUKABUMI, JAWA BARAT Syauly, Nunik Isnani; Pratiwi, Santi Dwi; Arfiansyah, Kurnia
Bulletin of Scientific Contribution Vol 23, No 2 (2025): Bulletin of Scientific Contribution : GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v23i2.65135

Abstract

Daerah Gunung Sungging, yang terletak di wilayah Geopark Ciletuh–Palabuhanratu, Kabupaten Sukabumi, merupakan salah satu lokasi tersingkapnya Formasi Bentang dengan litologi yang beragam. Meskipun sebaran batuan telah diidentifikasi secara umum dalam peta geologi regional, namun kajian berbasis analisis mikroskopis terhadap karakteristik batuannya masih minim. Penelitian ini bertujuan untuk mengidentifikasi karakteristik batuan sedimen pada bagian atas dari Formasi Bentang melalui pendekatan stratigrafi terukur dan analisis petrografi, dalam memahami lingkungan pengendapan dan proses geologi yang mempengaruhi pembentukan satuan tersebut. Litologi utama yang dijumpai terdiri atas batugamping dan batupasir karbonatan. Batugamping diklasifikasikan sebagai packstone, ditandai oleh tekstur grain-supported, sortasi sedang hingga baik, serta dominasi fragmen skeletal berupa foraminifera, alga, dan moluska, dengan pengisian matriks oleh mikrit dan semen karbonat. Sementara itu, batupasir karbonatan memiliki tekstur matrix-supported dan diklasifikasikan sebagai feldspathic wacke, dengan komposisi utama berupa feldspar, kuarsa, fragmen batuan, serta matriks lempung dan gelas vulkanik. Perbedaan karakteristik antara kedua litologi ini mencerminkan variasi energi dan suplai material dalam lingkungan pengendapan laut dangkal yang dipengaruhi oleh material biogenik dan vulkanik. Temuan ini memperkuat interpretasi terhadap dinamika fasies dan sistem sedimentasi Formasi Bentang di zona selatan Jawa Barat.
TEXTURAL VARIATION AND ALTERATION OF THE GUNUNG BULIGIR INTRUSIVE COMPLEX, BANTARUJEG, MAJALENGKA REGENCY, WEST JAVA: A PETROGRAPHIC APPROACH Ikhram, Rinaldi; Aini, Hana Nur; Rinawan, Rusman; Arfiansyah, Kurnia
Bulletin of Scientific Contribution Vol 24, No 2 (2026): Bulletin of Scientific Contribution
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/bsc.v24i2.70704

Abstract

The Gunung Buligir Intrusive Complex in Bantarujeg, Majalengka Regency, West Java, is an andesitic to dioritic intrusive body that penetrates Tertiary sedimentary sequences of the Halang and Kaliwangu Formations, yet its petrographic variability and alteration evolution remain poorly constrained. This study aims to systematically characterize mineral assemblages, textures, and hydrothermal alteration patterns to better understand fluid–rock interaction during arc-related magmatism. This study presents revised and elaborated petrographic characterization of five thin-section samples (BTRJ1–BTRJ5), integrating modal point-counting data (1,000 points per sample), detailed alteration mineralogy, and systematic textural analysis. Four of five samples (BTRJ1, 2, 3, 5) are classified as porphyry microdiorite with a microplagioclase groundmass, while BTRJ4 is classified as a diorite with a more equigranular texture (0.5 mm crystal size). The primary phenocryst assemblage is dominated by plagioclase (averaging ~28% as phenocrysts) and hornblende/amphibole (~13%), with clinopyroxene identified exclusively in BTRJ4 (~6%). Quartz ranges from <1% (BTRJ2) to ~5% (BTRJ3). Secondary alteration is dominated by a propylitic assemblage of chlorite, epidote, calcite, sericite, and secondary quartz. Alteration intensity is ranked BTRJ3 > BTRJ2 > BTRJ4 > BTRJ5 > BTRJ1. The spatial variability in alteration intensity and the occurrence of corona textures indicate a multi-stage hydrothermal system involving evolving fluid composition and temperature conditions. These results provide new insights into the coupling between magmatic crystallization and hydrothermal processes in Neogene arc intrusions and contribute to a better understanding of alteration zoning and fluid evolution in the Bogor Zone, West Java.
Co-Authors Adi Hardiyono Aini, Hana Nur Aton Patonah Barkah, Mohamad Nursiyam Bombom Rachmat Suganda, Bombom Rachmat Bulqiah Ulfa, Ratu Cecep Yandri Sunarie Efendi, Tri Septanto Euis Tintin Yuningsih Faisal Helmi Ganjar Gani, Reza Moh Girlly Marchlina Listyono, Girlly Marchlina Hutauruk, Gita Agnes Meilani Ichsan, Muhamad Ildrem Syafri Iyan Haryanto Krishna Yuliawati, Ayu Mega Fatimah Rosana Mochamad Nursiyam Barkah Muhammad Kurniawan Alfadli Nanda Natasia Pratiwi, Prisca Nurul Pulung Arya Pranantya, Pulung Arya Rinaldi Ikhram Rinawan, Rusman Rodhiya, Azzam Robbi Sapari Dwi Hadian, Sapari Dwi Syauly, Nunik Isnani W M Iskandarsyah, Teuku Yan Yusi Firmansyah, Yusi