PALEOBATIMETRI FORMASI JATILUHUR BERDASARKAN KUMPULAN FORAMINIFERA KECIL PADA LINTASAN SUNGAI CILEUNGSI, KABUPATEN BOGOR, JAWA BARAT

Lili Fauzielly, Lia Jurnaliah, Ria Fitriani

Abstract


Formasi Jatiluhur di sekitar Sungai Cileungsi merupakan lingkungan laut dangkal (zona neritik) berdasarkan dominasi foraminifera yang dikandungnya. Namun beberapa penelitian terdahulu menyatakan umur Formasi Jatiluhur yang bervariasi. Penelitian paleobatimetri berdasarkan kumpulan foraminifera kecil diharapkan dapat melengkapi kajian detil yang terkait dengan evolusi daerah ini selama Miosen. Pengambilan 30 sampel sedimen dilakukan secara sistematik pada satu lintasan di sepanjang Sungai Cileungsi. Hasil preparasi sampel sedimen dengan metode hidrogen peroksida menghasilkan 57301 individu foraminifera kecil yang terdiri dari 23276 individu foraminifera plangtonik dan 34025 foraminifera bentonik. Untuk mengetahui paleobatimetri, digunakan rasio foraminifera plangtonik dan foraminifera bentonik kecil.  Hasil  Rasio P/B berkisar antara 4,4 % - 74,0 % menunjukkan paleobatimetri Formasi Jatiluhur berkisar antara zona neritik dalam – zona batial atas.

Jatiluhur Formation in the area of Cileungsi River was a shallow marine environment based on the foraminiferas domination. Several previous published papers had suggested age variation of the Jatiluhur Formation. Paleobatimetry study based on small foraminiferas was expected to complete the Miocene evolution analysis of the region. Thirty sediment samples were picked systematically in a section line along Cileungsi River. The hydrogen peroxide preparation of sediment samples produced 57301 small foraminifera. There were 23276 planktonic foraminiferas and 34025 benthic foraminiferas.  To understand the paleobathimetry of this research area, we calculated the ratio of planktonic foraminifera and benthic foraminifera (P/B ratio).  The P/B ratio is betweeen 4,4% and 74,0%.  The ratio suggests that the paleobathimetry of Jatiluhur Formation is Inner Neritic Zone - Upper Bathyal Zone.


Keywords


Small Foraminifera, planktonic foraminifera, benthic foraminifera, paleobathimetry, Jatiluhur Formation.

References


Abdurrokhim, 2014. A Prograding Slope-Shelf Succsesion of The Middle-Late Miocene Jatiluhur Formation. Dissertation. Graduate School of Science. Chiba University.

Berggren, W. A., 1998. Marine Micropaleontology: An Introduction. In: Haq, B.U., dan Boersma, A. (Editor), Introduction to Marine Micropaleontology. 5th printing. Elsevier Science Publishing Co., Inc. New York.

Boltovskoy, E., dan Wright, R., 1976. Recent Foraminifera. Dr. W.Junk b.v. publishers the Hague.

Effendi, A. C., Kusnama dan Hermanto, B., 1998. Peta geologi Lembar Bogor, Jawa. Skala 1: 100.000, edisi kedua, Kementerian Energi dan Sumber Daya Mineral.

Jones, R. W., 2014. Foraminifera and Their Applications. Cambridge University Press. United Kingdom.

Jurnaliah, L., 2006. Paleoekologi Satuan Batulempung Formasi Jatiluhur, Daerah Cileungsi, Kab. Bogor, Jawa Barat. Bulletin of Scientific Contribution, 4(1), 78-87.

Lipps, J. H., 1979. Foraminiferal Ecology and paleoecology. SEPM Short Course No. 6. Houston.

Loeblich, A. R., dan Tappan, H., 1994. Foraminifera of the Sahul Shelf and Timor Sea. Special Publication no. 31. Cushman Foundation For Foraminiferal research Inc. Department of Invertebrate Paleontology. Harvard University. Cambridge, USA.

Mendes, I., Gonzales, R., Dias, J. M. A., Lobo, F., dan Martins, V., 2004. Factors Influencing Recent Benthic Foraminifera Distribution on The Guadiana Shelf (Southwestern Iberia). Marine Microplaeontology 51, 171-192.

Mulyasari, F., 1999. Geologi dan Biostratigrafi Pada Satuan Batulempung Formasi Jatiluhur Daerah Cileungsi dan sekitarnya, Kecamatan Cileungsi, Propinsi Jawa Barat. Universitas Padjadjaran, Fakultas Matematika dan Ilmu Pengetahuan Alam, Jurusan Geologi, Jatinangor.

Murray, J., dan Rohling, E. J., 2012. Foraminifera. http://www.noc.socton.ac. uk. National Oceanography Centre Southampton.

Reza, S. E. V., Jurnaliah, L., dan Abdurrokhim. 2016. Biostratigraphy Correlation of Jatiluhur, Kalapanungggal, and Subang Formation in Northern Part of Bogor Through. Proceedings Geosea XIV and 45TH IAGI Convention 2016. Bandung, 424-425.

Todd, R., Low, D., dan Mello, J. F., 1965. Smaller Foraminifera. In: Kummel, B. dan Raup, D (Editor), Handbook of Paleontological Techniques. W.H. Freeman Company. San Fransisco & London.

Valchev, B., 2003. On The Potential of Small Benthic Foraminiferal as Paleoecology indicators: Recent Advances. 50 Years University of Mining and geology “St. Ivan Rilski”. Annual. Geology and geophysics, Sofia, 46(I), 189-194.

Van Marle, L. J., 1989. Benthic Foraminifera From Banda Arc Region, Indonesia, and Their Paleobathymetric Significance For Geologic Interpretations of The Late Cenozoic Sedimentary Record. Free University Press, Amsterdam.




DOI: http://dx.doi.org/10.14203/risetgeotam2018.v28.660

Refbacks

  • There are currently no refbacks.


Copyright (c) 2018 RISET Geologi dan Pertambangan

Copyright of Journal RISET Geologi dan  Pertambangan (e-ISSN 2354-6638 p-ISSN 0125-9849). Powered by OJS

  

Indexed by:

     

         

 

Plagiarism checker: