DETAIL KOLEKSI

Analisis biofasies dan lingkungan pengendapan pada formasi parigi dan formasi Cibulakan atas, daerah Gunung Kromong Palimanan


Oleh : Arum Muktiyani

Info Katalog

Nomor Panggil : 550/TG/2015

Penerbit : FTKE - Usakti

Kota Terbit : Jakarta

Tahun Terbit : 2015

Pembimbing 1 : M. Ali Jambak

Subyek : Foraminifera - Fosil

Kata Kunci : Cekungan, Foraminifera


File Repositori
No. Nama File Ukuran (KB) Status
1. DAFTAR-ISI.pdf 195.82
2. DAFTAR-LAMPIRAN-LEPAS.pdf 123.55
3. DAFTAR-PUSTAKA.pdf 190.53
4. DAFTAR-TABEL.pdf 126.96
5. HALAMAN-PENGESAHAN-ASLI.pdf 1405.15
6. HALAMAN-PENGESAHAN.pdf 6.15
7. KATA-PENGANTAR.pdf 72.52
8. SARI.pdf 191.27
9. BAB--I.pdf 444.29
10. BAB-II.pdf 1384.41
11. BAB-III.pdf 1828.67
12. BAB-IV.pdf 2450.16
13. BAB-V.pdf 915.33
14. BAB-VI.pdf 2295.83
15. BAB-VII.pdf 72.5
16. LAMPIRAN-ANALISA-DETERMINASI-FOSIL.pdf 407.24
17. LAMPIRAN-ANALISIS-PETROGRAFI.pdf 2584.31

D Daerah penelitian termasuk ke dalam Cekungan Jawa Barat Utara, tepatnya pada Formasi Parigi dan Cibulakan Atas, Daerah Gunung Kromong, Cirebon, Jawa Barat. Analisis kandungan fosil Foraminifera dan analisis kalsimetri dilakukan untuk menganalisis biofasies dan lingkungan pengendapan batuan karbonat, mengetahui penyebaran biofasies, serta paleoekologi pada daerah penelitian. Metode yang digunakan pada penelitian ini adalah metode analisis fosil residu (picking), petrografi (thin section), dan analisis kalsimetri; dengan jumlah perconto residu (picking) sebanyak 23 (dua puluh tiga) perconto, perconto pertografi (thin section) sebanyak 74 (tujuh puluh empat) perconto, dan analisis kalsimetri sebanyak 18 (delapan belas) perconto. Penelitian ini terletak pada Formasi Parigi yang berumur N17- N20 berdasarkan hasil analisis Foraminifera plangtonik, dan Tg-Th berdasarkan analisis Foraminifera bentonik besar; dan Formasi Cibulakan Atas yang berumur N7-N16 yang berdasarkan hasil analisis Foraminifera plangtonik dan Te5-Tg yang berdasarkan hasil analisis Foraminifera bentonik besar. Biofasies batuan karbonat pada Formasi Parigi dan Cibulakan Atas terbagi atas 7 (tujuh) biofasies, yaitu (1) Biofasies Large Foraminifera, (2) Biofasies Large Foraminifera-skeletal, (3) Biofasies Foraminiferal – red Algae, (4) Biofasies Foraminiferal-coral, (5) Biofasies Skeletal-coral, (6) Biofasies Planktic Foraminiferalskeletal, dan (7) Biofasies Planktic Foraminiferal. Terdapat 3 (tiga) lingkungan pengendapan pada daerah penelitian, yaitu (1) Lingkungan pengendapan Inner Shelf, (2) Lingkungan pengendapan Middle Shelf, dan (3) Lingkungan pengendapan Outer Shelf. Berdasarkan hasil analisis kalsimetri, Formasi yang diteliti mempunyai kadar karbonat marl-clay sampai marly clay, sehingga dapat disimpulkan bahwa lingkungan pengendapan pada daerah penelitian berada di bawah CCD (Carbonate Compensation Depth). Paleoekologi daerah penelitian dapat dijelaskan sebagai berikut, dari 2 (dua) sumur pada umur N7-N16 dan Te5-Tg dapat disimpulkan akhir dari perubahan ekologi daerah di bagian selatan hingga baratlaut adalah semakin dangkal, yaitu middle shelf hingga inner shelf. Kemudian pada umur N17-20 dan Tg-Th terlihat adanya perubahan ekologi daerah di bagian selatan hingga timurlaut dangkal, yaitu middle shelf hingga inner shelf. Jadi, dapat disimpulkan lingkungan pengendapan pada daerah penelitian dari umur tertua hingga termuda mempunyai lingkungan pengendapan yang semakin dangkal.

R Researched area resides in Northern West Java Basin, specifically in Parigi Formation and Upper Cibulakan Formation, Gunung Kromong Area, Cirebon, West Java. Foraminifera contents analysis and calcimetric analysis were done to analyse carbonate rocks’ biofacies and depositional environment, to figure out biofacies distribution, and to define the paleoecology of researched area. Methods that had been used in this research are fossil residue (picking) method, petrography (thin section), and calcimetric analysis; with 23 (twenty three) fossil residue samples, 74 (seventy four) thin section samples, and 18 (eighteen) calcimetric analysis samples. The research was done in Parigi Formation which was deposited during N17-N20 based on planktonic Foraminifera analysis and Tg-Th based on large benthic Foraminifera analysis; and in Upper Cibulakan Formation which was deposited during N7-N16 based on planktonic Foraminifera analysis and Te5-Tg based on large benthic Foraminifera analysis. Carbonate rocks’ biofacies of Parigi Formation can be divided into 7 (seven) biofacies, which are (1) Large Foraminifera biofacies, (2) Large Foraminiferaskeletal biofacies, (3) Foraminiferal – red Algae biofacies, (4) Foraminiferal-coral biofacies, (5) Skeletal-coral biofacies, (6) Planktic Foraminiferal-skeletal biofacies, and (7) Planktic Foraminiferal biofacies. There are 3 (three) depositional environments in researched area, which are (1) Inner Shelf depositional environment, (2) Middle Shelf depositional environment, and (3) Outer Shelf depositional environment. Based on the result of calcimetric analysis, the researched formation has carbonate concentration of marly clay until marl-clay, so it can be concluded that the depositional environments in researched area were located below the CCD (Carbonate Compensation Depth). Paleoecology of the researched area can be explained as follows, from 2 (two) wells in age of N7-N16 and Te5-Tg, it can be concluded that the last paleoecology change is shallowing from the southern part to the northwestern part, which is shallowing from middle shelf to inner shelf. Then, in age of N17-N20 and Tg-Th, it can be concluded that the last paleoecology change is shallowing from the southern part to northeastern part, which is shallowing from middle shelf to inner shelf. As a conclusion, depositional environments of the researched area from the oldest age to the youngest age have overall shallowing depositional environments.

Bagaimana Anda menilai Koleksi ini ?