Facies analysis and depositional model of the middle-upper triassic Semantan formation, Central Pahang, Malaysia

• Main Authors: Muhammad Azfar, Mohamed, Mazshurraiezal, Nasir, Mohd Syukri, Said, Meng, Choongchee, Mohamad Shaufi, Sokiman, Nur Asyraf, Md Akhir, Muhammad Aslam, Md Yusof, Muhammad Noor Amin, Zakariah, Mohd Nizam, Abdul Rashid, Salahuddin, Husein, Noorzamzarina, Sulaiman, Afiq Naim, Mohd
• Format: Article
• Language: English; English
• Published: Penerbit UTM Press 2022
• Subjects: TA Engineering (General). Civil engineering (General)
• Online Access: http://umpir.ump.edu.my/id/eprint/42662/1/Facies%20analysis%20and%20depositional%20model%20of%20the%20middle-upper%20triassic.pdf; http://umpir.ump.edu.my/id/eprint/42662/2/Facies%20analysis%20and%20depositional%20model%20of%20the%20middle-upper%20triassic%20Semantan%20formation%2C%20Central%20Pahang%2C%20Malaysia_ABS.pdf; http://umpir.ump.edu.my/id/eprint/42662/; https://doi.org/10.11113/aej.V12.17312; https://doi.org/10.11113/aej.V12.17312

This study details the sedimentological analysis of the Middle-Upper Triassic Semantan Formation in the Jerantut-Temerloh-Kemayan region of central Pahang. Seven (F1-7) facies have been identified which are; F1) poorly sorted conglomerate, F2) pebbly sandstone, F3) structureless-to-parallel laminated sandstone, F4) wavy-to-ripple fine-to-medium laminated sandstone, F5) slumped thin-interbeded sandstone and shale, F6) interbedded sandstone and shale, and F7) shale, represent a subordinate part of the Semantan Formation. Examination of the succession of the vertical facies resulted in concession of genetic units (FA1-FA5) which are; FA1) deep channel complex, FA2) distal lobe, FA3) hybrid gravity flow deposit, FA4) channelised lobe and FA5) non-channelised lobe. It is believed that these five genetic units were deposited within four proposed laterally contiguous depositional environments which are; 1) Inner fan - deep channel-levee complex (represent by FA1), 2) Mid fan - channelised lobe (represented by FA5 and FA3), 3) Mid Fan - non-channelised lobe (represented by FA4 and FA3), and 4) Outer fan - distal lobe (represented by FA2). The Semantan Formation deep-water fan is analysed as a sand-rich fan system, based on its sediment types.