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Sains Malaysiana 52(12)(2023): 3371-3394
http://doi.org/10.17576/jsm-2023-5212-03
Sedimentological Analysis of Thin-Bedded Sequence of Eastern Part of West Crocker
Formation, Northwest Sabah, Malaysia
(Analisis Sedimentologi Jujukan Selang Lapis Nipis di Bahagian Timur Formasi Crocker Barat,
Barat Laut Sabah, Malaysia)
NURUL AFIFAH MOHD RADZIR1,2,*,
ATHIFAH ARSHAD1,2, CHE AZIZ ALI2 & KAMAL ROSLAN MOHAMED2
1Geology Program, Department of
Earth Science and Environment, Faculty of Science and Technology, Universiti Kebangsaan Malaysia,
43600 UKM Bangi, Selangor, Malaysia
2Basin Research Group, Universiti Kebangsaan Malaysia,
43600 UKM Bangi, Selangor, Malaysia
Diserahkan: 24 Julai 2023/Diterima: 14 Disember 2023
Abstract
It has been suggested that the eastern part of the
West Crocker Formation is the slope to the inner fan of a deep-water system.
Detailed sedimentological examination of eight
outcrops of this formation in this study identified four types of facies: interbedded sandstone and mudstone facies (F1), chaotic facies (F2),
and mudstone facies (F3). The immature textures and
deformations with rolled-over sandstone block deposits occur as infers due to
the presence of an angle of loose sediments, while the repeated thinly bedded
sandstones and mudstones were recognized as levee-channel complexes. The
overbank was identified as thick mudstone deposits. The sandstone deposits are
synonymous with strong energy carried by the head of the turbidity current,
while the fine to very fine sediment grains are typical of sediments that are
carried by the body and tail of turbidity current and may deposited far away
from the first deposition of sand. All the characteristics presence in the
environment of slope are to the inner fan of a deep-water system with deformed
structures. This deformed slope is believed to be part of a late Eocene
accretionary complex formed during the Sabah orogeny.
Keywords: Crocker Formation; deep-water; mass transport deposits;
Paleogene
Abstrak
Bahagian timur Formasi Crocker Barat merupakan cerun hingga kipas dalam
sistem pengendapan laut dalam. Penilaian sedimentologi secara terperinci ke
atas lapan lokaliti singkapan batuan telah mengelaskan kawasan kajian kepada
tiga jenis fasies iaitu: fasies selang lapis batu pasir dan batu lumpur (F1),
fasies terkacau (F2) dan fasies batu lumpur (F3). Tekstur yang tidak matang dan
canggaan yang tinggi dengan kehadiran blok-blok batu pasir di dalamnya
terbentuk disebabkan kehadiran satah cerun pada enapan sedimen yang longgar,
manakala selang lapis batu pasir dan batu lumpur yang terbentuk di dalam
singkapan kawasan tetambak. Kehadiran lumpur tebal pula dikenal pasti sebagai
singkapan yang terbentuk di kawasan dataran lembangan. Pengendapan sedimen
bersaiz pasir adalah sinonim diangkut melalui tenaga yang kuat di bahagian
kepala arus keruh, manakala butiran sedimen berbutir halus boleh diangkut
melalui badan dan ekor dalam arus keruh dienapkan di kawasan yang lebih jauh
daripada pengendapan batu pasir. Kesemua ciri yang ditunjukkan pada singkapan
yang dikaji membuktikan kawasan kajian merupakan kawasan cerun hingga kipas
dalam di dalam sekitaran pengendapan laut dalam yang tercangga. Cerun yang
tercangga ini dipercayai sebahagian daripada kompleks akresi berusia lewat
Eosen terbentuk semasa Orogeni Sabah.
Kata kunci: Enapan angkutan jisim; Formasi Crocker; laut dalam; Paleogen
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*Pengarang untuk surat-menyurat;
email: nurulafifah@ukm.edu.my
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