期刊
MARINE GEOLOGY
卷 430, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.margeo.2020.106342
关键词
Holocene Relative Sea Level; Sunda Shelf; Coral Microatoll; Radiocarbon Marine Reservoir Correction
资金
- National Research Foundation Singapore
- Singapore Ministry of Education under the Research Centres of Excellence initiative
- National Research Foundation Singapore under its Singapore NRF Fellowship scheme [NRF-RF2010-04, NRF-NRF2011-08, NRF-NRFF11-2019-0008]
- Singapore Ministry of Education Academic Research Fund [MOE2018-T2-1-030, MOE2019-T3-1-004]
- European Research Council [ERC-StG-678145-CoupledIceClim]
A high-precision relative sea level (RSL) record over the past 6400 years, reconstructed from fossil coral microatoll colonies, is reported for Natuna Island, Indonesia. The timing of 11 fossil microatolls from four sites on Natuna Island is constrained by replicate C-14 and Th-230 dates. We investigate the local marine reservoir correction (Delta R) using the replicate dates. The two sets of dates become aligned if a Marine20 Delta R of - 143 +/- 176 yr, 1 sigma (Marinel 3 Delta R of 15 +/- 63 yr) is assigned to the C-14 dates. The distribution of microatoll ages and elevations indicates that RSL was relatively stable from 6400 to 1400 yr BP at 0.2-0.7 +/- 0.4 m (2 sigma) higher than present, before a fall to current levels. A comparison with the predictions of a suite of glacial isostatic adjustment (GIA) models for Southeast Asia suggests refinements are needed in ice-history models to fully capture our RSL data. These new constraints on past RSL of the Sunda Shelf contribute to further calibration of GIA models in the tropics, where RSL data are presently insufficient.
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