FACIES AND PETROGRAPHIC CHARACTERISTICS OF CILETUH FORMATION IN THE MANDRAJAYA AREA, CIEMAS SUBDISTRICT, WEST JAVA
Abstrak
The Eocene Ciletuh Formation, exposed within the Ciletuh-Palabuhanratu UNESCO Global Geopark, provides a key record of syn-tectonic sedimentation in West Java. While its general submarine fan setting is known, detailed facies and petrographic studies in specific localities are limited. This study aims to characterize the sedimentology of the Ciletuh Formation sandstone in the Mandrajaya area through an integrated analysis of lithofacies, petrography, and their spatial distribution to reconstruct its depositional environment. The methodology involved geological mapping to document outcrop characteristics and collect samples, followed by petrographic analysis of sandstones and conglomerates. Four primary lithofacies were identified: (a) matrix-supported polymictic conglomerate, (b) graded sandstone, (c) parallel-laminated sandstone, and (d) massive sandstone. Petrographic analysis reveals that the sandstones are texturally immature Lithic Arenites, and the conglomerates contain polymictic clasts of gabbro and recycled sandstone within a similar lithic arenite matrix. The spatial distribution of these facies delineates a submarine fan architecture, characterized by channel-fill deposits (conglomerates and massive sandstones) flanked by associated levee and overbank deposits (graded and laminated sandstones). The lithofacies association and petrographic composition confirm deposition within a dynamic submarine fan system sourced from a "Recycled Orogenic" belt, specifically the uplifted Ciletuh mélange complex, within a tectonically active Paleogene fore-arc basin.
Keywords: Submarine Fan, Lithic Arenite, Conglomerate, Fore-arc Basin, Sedimentation, Turbidite, Eocene.
Teks Lengkap:
PDF (English)Referensi
Boggs, S. Jr. (2014). Principles of Sedimentology and Stratigraphy (5th ed.). Pearson Education Limited.
Bouma, A. H. (1962). Sedimentology of Some Flysch Deposits: A Graphic Approach to Facies Interpretation. Elsevier.
Dickinson, W. R., & Suczek, C. (1979). Plate Tectonics and Sandstone Compositions. AAPG Bulletin, 63(12), 2164–2182. https://doi.org/10.1306/2F9188FB-16CE-11D7-8645000102C1865D
Hartono, B. M., Pradipta, D., Sausan, Z., Adhika, Y., Muhadi, U., Mussofan, W., & Abdullah, C. I. (2022). Depositional Model of Middle Eocene Ciletuh Formation: New Field Findings from Kunti Island, Ciletuh, West Java. Proceedings of the PIT IAGI 51st 2022, October 25th–27th.
Ikhram, R., Hoshide, T., Ohba, T., Rosana, M. F., & Hardiyono, A. (2025). Origin and evolution of serpentinized peridotite from the Ciletuh Mélange in Sunda Arc, Indonesia: Evidence from petrography, mineralogy, and geochemistry. Journal of Asian Earth Sciences: X, 13, 100188. https://doi.org/10.1016/J.JAESX.2024.100188
Ikhram, R., Rosana, M. F., Agusta, R., & Andriani, S. S. (2018). Study of Significance of Geodiversity in Ciletuh–Palabuhanratu National Geopark, West Java, Indonesia. International Journal of Electrical Engineering, 11(02), 139–145. https://doi.org/10.21276/ijee.2018.11.0207
Ikhram, R., Syafri, I., & Rosana, M. F. (2023). Petrology, Geochemistry and K-Ar Dating of Metamorphic Rock in Ciletuh Mélange Complex, West Java Indonesia. Riset Geologi Dan Pertambangan, 33(1), 1–15. https://doi.org/10.55981/RISETGEOTAM.2023.1054
Martodjojo, S. (2003). Evolusi Cekungan Bogor, Jawa Barat. Penerbit ITB.
Nichols, G. (2009). Sedimentology and Stratigraphy (2nd ed.). Wiley-Blackwell.
Patonah, A. (2011). Lingkungan tektonik ofiolit Komplek Melange Ciletuh Jawa Barat berdasarkan pendekatan petrologi. Bulletin of Scientific Contribution: Geology, 9(3), 139–151. https://doi.org/10.24198/bsc.v9i3.8270
Pettijohn, F. J. (1975). Sedimentary Rocks (3rd ed.). Harper & Row.
Rosana, M. F., Isnaniawardhani, V., Hardiyono, A., Helmi, F., Brilian, C. H., Nugraha, K. S. A., Saragih, K. D., Ardiansyah, A., Ikhram, R., Zulfaris, D. Y., & Agustin, F. (2019). Geological Map of the Cikadal – Lengkong Sheet (1208-43) and (1208-64). University of Padjadjaran and Geological Survey of Indonesia.
Rosana, M. F., Mardiana, U., Syafri, I., Sulaksana, N., & Haryanto, I. (2006). Geologi Kawasan Ciletuh, Sukabumi: Karakteristik, Keunikan dan Implikasinya. Universitas Padjadjaran.
Satyana, A. H., Prasetyo, A., & Rosana, M. F. (2021). Ciletuh Subduction, Southwest Java (New Findings: Nature, Age, and Regional Implications). Proceedings of the Indonesian Petroleum Association 44th Annual Convention and Exhibition. https://doi.org/10.29118/IPA21-G-29
Schiller, D. M., Garrard, R. A., & Prasetyo, L. (1991). Eocene Submarine Fan Sedimentation in Southwest Java. Proceedings of the Indonesian Petroleum Association 20th Annual Convention, 125–181.
Sudithio, R., Rosana, M. F., & Senjaya, Y. A. (2017). Asal Sedimen Formasi Ciletuh di Teluk Ciletuh, Kabupaten Sukabumi. Padjadjaran Geoscience Journal, 1(3), 260–269. https://doi.org/10.24198/PGJ.V1I3.15088
Sukamto, R. (1975). Geological Map of Jampang and Balekambang Sheet (Sheet No. 1208-52 and 1208-66), West Java, Scale 1:100,000. Department of Mines and Energy – Directorate General of Geology and Mineral Resources – Geological Research and Development Centre.
van Bemmelen, R. W. (1949). The Geology of Indonesia, Volume IA: General Geology of Indonesia and Adjacent Archipelagoes. Government Printing Office.
Walker, R. G. (1978). Deep-Water Sandstone Facies and Ancient Submarine Fans: Models for Exploration for Stratigraphic Traps. AAPG Bulletin, 62(6), 932–966. https://doi.org/10.1306/C1EA4F77-16C9-11D7-8645000102C1865D
Winantris, Rosana, M. F., & Sena, K. (2023). Age and Depositional Environment of the Sandstone Unit of Ciletuh Formation in Ciletuh-Palabuhanratu Geopark. Indonesian Journal on Geoscience, 10(1), 73–82. https://doi.org/10.17014/IJOG.10.1.73-82
DOI: https://doi.org/10.24198/bsc.v23i2.65345
Refbacks
- Saat ini tidak ada refbacks.