Sains Malaysiana 46(12)(2017): 2315–2323

http://dx.doi.org/10.17576/jsm-2017-4612-07

Sedimentologi Batuan Enapan Daratan Kumpulan Gagau (Usia Kapur Awal) di Hulu Sungai Chichir, Terengganu Darul Iman, Malaysia

(Gagau Group (Early Cretaceous) Sedimentary Rock Deposited at Sungai Chichir Upstream,

Terengganu Darul Iman, Malaysia)

KHOR WEI CHUNG^1*, MOHD SHAFEEA LEMAN¹, MUHAMMAD ASHAHADI DZULKAFLI¹, KAMAL ROSLAN MOHAMED¹, CHE AZIZ ALI¹ & JASMI AB TALIB²

¹Geology Programme, School of Environment and Natural Resources Science, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

²Department of Geosciences, Faculty of Geosciences and Petroleum Engineering, Universiti Teknologi PETRONAS, 32610 Tronoh, Perak Darul Ridzuan, Malaysia

Diserahkan: 1 Julai 2017/Diterima: 26 Oktober 2017

ABSTRAK

Jujukan batuan sedimen Kapur Awal Kumpulan Gagau di kawasan sekitar hulu Sungai Chichir dibentuk oleh batu pasir berpebel masif, batu lumpur masif dan lapisan tebal batu pasir dengan pelbagai struktur sedimen serta fosil. Jujukan ini boleh dibahagikan kepada tujuh fasies dengan mekanisme pengenapan berbeza. Berdasarkan asosiasi antara pelbagai fasies sedimen dapat ditafsirkan bahawa jujukan ini telah terenap dalam pelbagai sekitaran dataran aluvium termasuk alur sungai utama, sungai berliku, sungai berburai dan dataran banjir. Fosil yang ditemui memberikan usia Kapur Awal kepada jujukan ini. Bukti kehadiran tanah atas di kawasan ini mencerahkan harapan untuk penemuan pelbagai fosil hidupan daratan, khususnya fauna vertebrat serta dinosaur yang lebih baik dan lengkap.

Kata kunci: Fasies sedimen; jujukan sedimen; Kapur Awal; kumpulan Gagau; sekitaran pengenapan; Sungai Chichir

ABSTRACT

The early cretaceous sedimentary sequence of Gagau Group exposed along the upstream of Sungai Chichir comprises of massive pebbly sandstone, massive mudstone and thickly bedded sandstone with various sedimentary structures and fossils. This sequence can be divided into seven sedimentary facies with different mechanism of sedimentation. Based on association between various sedimentary facies it can be interpreted that this sequence was deposited in various aluvial plain environment including main river channel, meandering rivers, braided river and flood plain. Fossils discovered give an early cretaceous age to the sequence. Evidence of top-soil give a good prospect of finding better and more complete terrestrial fossils, especially vertebrate fauna and dinosaurs.

Keywords: Depositional environment; early cretaceous; Gagau Group; sedimentary facies; sedimentary sequence; Sungai Chichir

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