Holocene relative sea-level records from coral microatolls in Western Borneo, South China Sea

Majewski, Jędrzej M. and Switzer, Adam D. and Meltzner, Aron J. and Parham, Peter R. and Horton, Benjamin P. and Bradley, Sarah L. and Pile, Jeremy and Chiang, Hong-Wei and Xianfeng, Wang and Chiew, Tyiin Ng and Tanzil, Jani and Müller, Moritz and Aazani, Mujahid (2018) Holocene relative sea-level records from coral microatolls in Western Borneo, South China Sea. The Holocene, 28 (9). pp. 1431-1442. ISSN 9596836

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The spatial variability of Holocene relative sea level (RSL) in the South China Sea is unknown, with data restricted to Thailand, the Malay Peninsula, and a few other isolated sites. In this study, we present new continuous RSL records for Borneo using surveyed and U–Th dated coral microatolls from four sites in western Sarawak. The record spans 450 years of RSL from 7450 to 7000 yr BP. Our data suggest that RSL was higher than present and rapid RSL rise had ceased by 7450 yr BP. We compare these RSL reconstructions with a regional model of glacial-isostatic adjustment (GIA). The RSL reconstructions from three sites off the coast of Sarawak show a spatial gradient opposite to that predicted by the GIA model. This disagreement can best be explained by tectonic deformation since 7000 yr BP, which was previously unrecognized. We propose vertical land motion of 0.7–1.45 m due to slip on the Serabang fault, which runs between our four sites. This slip may have occurred in response to the loading of the Sunda Shelf by rising sea level.

Item Type: Article
Uncontrolled Keywords: Borneo tectonics, coral microatolls, GIA models, Holocene highstand, relative sea level, Sarawak, Serabang fault, unimas, university, universiti, Borneo, Malaysia, Sarawak, Kuching, Samarahan, ipta, education, research, Universiti Malaysia Sarawak
Subjects: S Agriculture > SH Aquaculture. Fisheries. Angling
Divisions: Academic Faculties, Institutes and Centres > Faculty of Resource Science and Technology
Faculties, Institutes, Centres > Faculty of Resource Science and Technology
Depositing User: Karen Kornalius
Date Deposited: 15 Jul 2019 01:35
Last Modified: 27 Apr 2021 06:26
URI: http://ir.unimas.my/id/eprint/25828

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