Investigasi Lingkungan Pengendapan berdasarkan Fasies Batuan Karbonat Formasi Pamutuan Daerah Sindangsari dan Sekitarnya, Cimerak, Pangandaran, Provinsi Jawa Barat
Abstract
The research area is in the Sindangsari and surrounding areas, Cimerak District, Pangandaran Regency, West Java Province. The study area is included in the Pamutuan Formation, which is exposed in the South of the Karangnunggal map sheet, the Middle Miocene Pamutuan Formation, with a shallow marine depositional environment. Differences in sedimentation processes and the relationship between formations at several locations are thought to be due to the influence of early paleogeography. This is an interesting study because it can provide a specific description of the development of the depositional environment in the study area. In order to understand the Pamutuan Formation's sedimentation process, facies and depositional environment analyses were carried out in this study. The method used in this study included collecting data by selecting representative samples and carrying out petrological and petrographic descriptions to determine a facies such as lithology. Based on data analysis, four rock facies were obtained; Greywacke lithic and Mudrock, Bounstone, facies Packstone, and Mudstone. These facies were deposited in four alternating depositional environments: sand shoals, reef margin, slope, and toe of the slope. Microfossil analysis shows that carbonate rocks from the Pamutuan Formation in the study area were deposited at N 13 – N 14 (Middle Miocene) in the Middle Neritic – Outer Neritic environment (100 – 200 meters).
Keyword : facies, depositional environment, pamutuan, Southern mountain, pangandaran.
References
[2] C. Tavares, L. Borghi, P. Corbett, J. Nobre-Lopes, and R. Câmara,“Facies and depositional environments for the coquinas of the Morro do Chaves Formation, Sergipe-Alagoas Basin, defined by taphonomic and compositional criteria,” Brazilian J. Geol., vol. 45, no. 3, pp. 415–429, 2015.
[3] H. Emraninasab, M. H. Adabi, M. Majidifard, and N. K. Ghadimvand, “Facies Interpretation, Depositional Environment and Sequence Stratigraphy of the Sartakht Formation in the Bakhshi Section, Located in Kalmard Block, East-Central Iran,” Open J. Geol., vol. 6, pp. 314–329, 2016.
[4] Hashmie, A. Rostamnejad, F. Nikbakht, M. Ghorbanie, P. Rezaie, and H. Gholamalian, “Depositional environments and sequence stratigraphy of the Bahram Formation (middle–late Devonian) in north of Kerman, south-central Iran,” Geosci. Front., vol. 7, no. 5, pp. 821–834, 2016.
[5] Z. Khattak, M. A. Khan, Z. Rahman, M. Ishfaque, and M. Yasin, “Microfacies and Diagenetic Analysis of Lockhart Limestone, Shah Alla Ditta Area Islamabad, Pakistan,” Pakistan J. Geol., vol. 1, no. 1, pp. 24–26, 2017.
[6] M. Schlaich and T. Aigner, “Facies and integrated sequence stratigraphy of an Epeiric Carbonate Ramp Succession: Dhruma Formation, Sultanate of Oman,” Depos. Rec., vol. 3, no. 1, pp. 92– 132, 2017.
[7] M. H. Adabi, U. Kakemem, and A. Sadeghi, “Sedimentary facies, depositional environment, and sequence stratigraphy of Oligocene– Miocene shallow water carbonate from the Rig Mountain, Zagros basin (SW Iran),” Carbonates and Evaporites, vol. 31, no. 1, pp. 69– 85, 2016.
[8] M. Omidvar, A. Safari, H. Vaziri-Moghaddam, and H. Ghalavand, “Facies analysis and paleoenvironmental reconstruction of upper cretaceous sequences in the eastern Para-Tethys basin, NW Iran,” Geol. Acta, vol. 14, no. 4, pp. 363–384, 2016.
[9] M. A. Jambak, I. Syafri, V. Isnaniawardhani, B. Benyamin, and H. Rodriguez, “Facies and Diagenetic Level of the Upper Cibulakan and Parigi Formation, in Randegan and Palimanan Area,” Indones. J.
[10] van Bemmelen, R. W. (1949). General Geology of Indonesia and adjacent archipelagoes. The geology of Indonesia.
[11] Pulunggono, A. dan Martodjojo, S., 1994, Perubahan tektonik Paleogen-Neogen merupakan peristiwa tektonik penting di Jawa, Kumpulan Makalah Seminar Geologi dan dan Geotektonik Pulau Jawa sejak Akhir Mesozoik hingga Kuarter, Jurusan Geologi Universitas Gadjah Mada, Yogyakarta, hal. 1 – 14.
[12] Supriatna, S., Sarmili, L., Sudana, D., dan Koswara, A., 1992, Peta Geologi Indonesia Lembar Karangnunggal, Jawa (skala 1:100.000), Pusat Penelitian dan Pengembangan Geologi.
[13] Pettijohn, F. J. (1975). Sedimentary rocks (Vol. 3, p. 628). New York: Harper & Row.
[14] Grabau, A. 1904. On The Classification of Sedimentary Rocks, New Jersey: Princeton University.
[15] Dunham, R.J. 1962, Classification of carbonate rocks according to depositional texture: American Association of Petroleum Geologists, Memoir, v. 1, p. 108- 121.
[16] Wilson, J. L., 1975. Carbonate Facies in Geologic History. Springer Verlag, New York, 471.
[17] Schlager, W., 2005. Carbonate Sedimentology and Sequence Stratigraphy, SPEM, Tulsa, Oklahoma.
[18] Blow, W. H. (1969, January). Late Middle Eocene to Recent planktonic foraminiferal biostratigraphy. In Proceedings of the first international conference on planktonic microfossils (Vol. 1, pp. 199-422). Leiden: Ej Brill.
[19] Tipsword, H. L, Setzer, F. M, dan Smith, F. L. JR. 1966. Interpretation of Depositional Environment in Gulf Coast Petroleum Exploration from Paleoecology and Related Stratigraphy. Gulf Coast Assoc. Geol. Socs. Trans.
[20] Wentworth, C. K. (1922). A scale of grade and class terms for clastic sediments. The journal of geology, 30(5), 377-392.
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