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All Journal Bulletin of Scientific Contribution : Geology JGE (Jurnal Geofisika Eksplorasi) Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir Journal of Science and Applicative Technology Jurnal Pengabdian Pada Masyarakat Berita Sedimentologi TeknoKreatif: Jurnal Pengabdian kepada Masyarakat Journal of Sciencce Technology and Visual Culture Journal of Geosciences and Applied Geology Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Rinaldi Ikhram
Institut Teknologi Sumatera
Agriculture, Biological Sciences & Forestry Arts Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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GEOCHEMISTRY OF VOLCANIC ROCKS OF THE BALEENDAH AREA AND SURROUNDINGS, BANDUNG REGENCY, WEST JAVA Ikhram, Rinaldi; Ranuwijaya, Emir Sulaiman; Fachrudin, Kurnia Arfiansyah
Bulletin of Scientific Contribution Vol 24, No 1 (2026): 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.v24i1.69990

Abstract

The Baleendah area, Baleendah District, Bandung Regency, West Java, contains andesitic-dacitic volcanic rocks produced during the second eruptive phase of Baleendah Volcano (~2.8–3.2 Ma). Major-oxide XRF analyses of four representative samples (ESR 02, ESR 14, ESR 18, ESR 22) yield SiO2 contents of 57.6–63.3 wt.%, classifying the rocks as andesite on the Total Alkali–Silica diagram. The FeOt/MgO vs. SiO2 diagram and AFM ternary diagram both place the samples within the tholeiitic series field; ESR 14 is transitional with the highest FeOt/MgO ratio of 9.45. Harker variation diagrams reveal systematic decreases in Al2O3, CaO, MgO, and FeOt with increasing SiO2, consistent with fractional crystallisation of plagioclase, pyroxene, and Fe–Ti oxides. Compared to the older Pliocene calc-alkaline suite from the Southern Bandung area (samples KRM and CPN), the ESR samples show lower MgO, CaO, Sr, V, and Co concentrations alongside higher FeOt/MgO ratios, indicating a more iron-enriched, more evolved magma. The tholeiitic character, elevated FeOt/MgO, and depleted compatible element concentrations collectively point to advanced fractional crystallisation under relatively low oxygen fugacity within a shallow crustal magma chamber beneath the Baleendah volcanic system.
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 Aini, Hana Nur Alfajar Puja Kusuma Angga Jati Widiatama Danni Gathot Harbowo Duwi Hariyanto Euis T. Yuningsih, Euis T. Fachrudin, Kurnia Arfiansyah Hariyanto, Duwi Hasbiyalloh Hasbiyalloh Hasbiyalloh, Hasbiyalloh Irfan Arifin Isnaini Rahmadi Joko Wahyudiono Joko Wahyudiono Katon Sena Aji Nugraha Kessar D. Saragih, Kessar D. Khoirun Naimah Kurnia Arfiansyah, Kurnia Kusuma, Alfajar Puja Lauti Dwita Santy Lauti Dwita Santy Madi Madi Madi, Madi Mega F. Rosana, Mega F. Naimah, Khoirun Natalia, Happy Christin Nugraha Ardiansyah Nugraha Ardiansyah, Nugraha R. Irvan Sophian Rafi, Risfihan Rahmadi, Isnaini Ranuwijaya, Emir Sulaiman Rinawan, Rusman Risfihan Rafi Wahidah, Andhika Nurul Widiatama, Angga Jati Yogi Adi Prasetya