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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