Late Holocene relative sea-level records from coral microatolls in Singapore

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1038/s41598-024-62937-9. This is version 2 of this Preprint.

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Authors

Fangyi Tan, Benjamin Horton, Ke Lin, Tanghua Li , Jennifer Quye-Sawyer , Joanne TY Lim, Dongju Peng, Zihan Aw, Shi Jun Wee, Jing Ying Yeo, Ivan D Haigh , Xianfeng Wang, Lin Thu Aung, Andrew Mitchell, Gina Sarkawi, Xinnan Li, Nurul Syafiqah Tan, Aron Meltzner

Abstract

Late Holocene relative sea-level (RSL) data are important to understand the drivers of RSL change, but there is a lack of precise RSL records from the Sunda Shelf. Here, we produced a Late Holocene RSL reconstruction from coral microatolls in Singapore, demonstrating for the first time the utility of Diploastrea heliopora microatolls as sea-level indicators. We produced 12 sea-level index points and three marine limiting data with a precision of < ± 0.2 m (2σ) and < ± 26 yrs uncertainties (95% highest density region). The data show a RSL fall of 0.31 ± 0.18 m between 2.8 kyrs BP and 0.6 kyrs BP, at rates between -0.1 ± 0.3 mm/yr and -0.2 ± 0.7 mm/yr. Surface profiles of the fossil coral microatolls suggest fluctuations in the rate of RSL fall: 1) stable between 2.8 and 2.5 kyrs BP; 2) rising at ~1.8 kyrs BP; and 3) stable from 0.8 to 0.6 kyrs BP. The microatoll record shows general agreement with published, high-quality RSL data within the Sunda Shelf. Comparison to a suite of glacial isostatic adjustment (GIA) models indicate preference for lower viscosities in the mantle. However, more high quality and precise Late Holocene RSL data are needed to further evaluate the drivers of RSL change in the region and better constrain GIA model parameters.

DOI

https://doi.org/10.31223/X5W417

Subjects

Earth Sciences, Physical Sciences and Mathematics

Keywords

late Holocene, Sea level, Coral microatolls

Dates

Published: 2024-04-11 12:45

Last Updated: 2024-05-03 16:53

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License

CC-BY Attribution-NonCommercial 4.0 International

Additional Metadata

Conflict of interest statement:
None

Data Availability (Reason not available):
Will be available together with published paper