Paleoenvironment reconstruction and peat-forming conditions of Neogene paralic coal sequences from Mukah, Sarawak, Malaysia

Zainal Abidin, Nor Syazwani and Mustapha, Khairul Azlan and Abdullah, Wan Hasiah and Konjing, Zainey (2022) Paleoenvironment reconstruction and peat-forming conditions of Neogene paralic coal sequences from Mukah, Sarawak, Malaysia. Scientific Reports, 12 (1). ISSN 2045-2322, DOI

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Eight coal seams containing Neogene paralic coals from the Mukah coalfield, Sarawak, Malaysia, were investigated using petrographical, palynological, and organic geochemical analyses to describe coal-forming vegetation, paleoclimatic, and paleoenvironment conditions during peat development and precursor mires, as well as their associations within a sequence-stratigraphic context. The petrographic and geochemical data of the coals imply the existence of oxygen-deficient and water-saturated conditions in the precursor mires. The reducing conditions in the mires were followed by biomass loss. The Mukah coals are suggested to be deposited in freshwater peat swamps, and the rich preservation of angiosperm pollen indicates that the organic matter in dense and lowland forest vegetation was mostly terrigenous. The overwhelming presence of Casuarina and Calamus types suggest the paleomires were closely linked to the Kerapah/Kerangas peat forest and were marginally bordered by rattan, which was supported by biomarker data. Rheotrophic-ombrotrophic mires temporarily formed due to water table fluctuations, which were strongly dependent on ever-wet climate changes and syn-depositional tectonics during the Neogene, and resulted in the balanced to high peat accumulation and preservation. A maximum thickness of 35 m of peat deposits is suggested to form between 10,000 and 175,000 years ago based on the peat:coal ratio. The coals are proposed to be influenced by transgressive to initial highstand cycles within the paralic setting.

Item Type: Article
Funders: Research grant YUTP-FRG from Universiti Teknologi PETRONAS (Grant No: 0153AA-E82), Universiti Malaya (Grant No: IPPP PG315-2016A)
Uncontrolled Keywords: Source-rock characteristics; Northern Benue trough; Organic geochemistry; Depositional environment; Cretaceous coals; Gates formation; Southeast-Asia; Basin; Indicators; Biomarker
Subjects: Q Science > QE Geology
Divisions: Faculty of Science > Department of Geology
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 16 Oct 2023 02:56
Last Modified: 16 Oct 2023 02:56

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