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All Journal Bulletin of Scientific Contribution : Geology Journal of Geosciences and Applied Geology
Aini, Hana Nur
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science

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PETROGENESIS OF PASIR CUPU DIORITE, PLERED DISTRICT, PURWAKARTA, WEST JAVA Fachrudin, Kurnia Arfiansyah; Aini, Hana Nur; Syafri, Ildrem; Luthfi, Ahmad; Amitama, Emilia Bunga
Journal of Geological Sciences and Applied Geology Vol 2, No 5 (2018): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v2i5.20316

Abstract

Pasir Cupu located in the area of Plered and Sukatani, Purwakarta, West Java. It is geographically on 107o 26 '25.2' - 107o 27 '16.8' Easternmost and 6o 37 '22.8' - 6o 37 '03 "Southtermost. The Pasir Cupu is a formally formed intrusion, and classified into diorite (Streckeisen, 1978 in Gillespic and Styles, 1999). The method used is petroloogy, petrographic, and geochemical analysis using the XRF and CIPW methods. The megascopic appearance shows gray-colored rocks - in fresh, black-brown gray - in weathered ones; masive; very hard; fanheritic porphyritic textures; contains dark and bright minerals, dark minerals estimated to be amphibol, and pyroxene, and minerals that are bright feldspar; and masasaras are gray. Microscopic observations of 3 thin section of rock samples (CP 1, CP2 and CP3), showed porphyritic-afanitic texture, hypocrystalline, hypidiomorphic; composed of phenocryst plagioclase, amphibol, pyroxene, biotite, with mineral sizes between 0.1 mm - 4 mm; there are also small amounts of opaque, K-feldspar, quartz and carbonate minerals; with medium-coarse-grained bottom, consisting of plagioclase microlite, amphibole microlite, pyroxene and biotite microlite, carbonate minerals, chlorite and clay minerals. Based on geochemical analysis, Pasir Cupu is composed by diorite according to the Total Alkali Silica diagram. The magmatic series is included in the Calc-Alkaline and Thoeliitic series, the types of magma include the High-K and Medium-K (Calc-Alkaline Series) groups, as long as magma interacts with continental crust (continent), as long as the magma is based on the Island Arc Calc -Alkaline Basalt, the origin of magma origin ranged ± 140 Km - ± 185 Km in the Benioff zone and formed at temperatures of 1016 ̊ – 1062 ̊ C with rock specific gravity of 2.82 - 2.89 gram / cm3.
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 Ahmad Luthfi Amitama, Emilia Bunga Fachrudin, Kurnia Arfiansyah Ildrem Syafri Kurnia Arfiansyah, Kurnia Rinaldi Ikhram Rinawan, Rusman