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Microatoll record for large century-scale sea-level fluctuations in the mid-Holocene

Published online by Cambridge University Press:  20 January 2017

Ke-Fu Yu*
Affiliation:
South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China Radiogenic Isotope Laboratory, Center for Microscopy and Microanalysis, The University of Queensland, Qld 4072, Australia
Jian-Xin Zhao*
Affiliation:
Radiogenic Isotope Laboratory, Center for Microscopy and Microanalysis, The University of Queensland, Qld 4072, Australia
Terry Done
Affiliation:
Australian Institute of Marine Sciences, Townsville, Qld 4810, Australia
Te-Gu Chen
Affiliation:
South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
*
*Corresponding authors. K.-F. Yu is to be contacted at South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China. Fax: +61 7 3365 8530. J.-X. Zhao, Radiogenic Isotope Laboratory, Room 214C, Richard Building, University of Queensland, Brisbane, Qld 4072, Australia. Fax: +61 7 3365 8530. Email Address:yukefu@gmail.com, j.zhao@uq.edu.au
*Corresponding authors. K.-F. Yu is to be contacted at South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China. Fax: +61 7 3365 8530. J.-X. Zhao, Radiogenic Isotope Laboratory, Room 214C, Richard Building, University of Queensland, Brisbane, Qld 4072, Australia. Fax: +61 7 3365 8530. Email Address:yukefu@gmail.com, j.zhao@uq.edu.au

Abstract

Coral microatolls have been long used as precise indicators of past sea level, but their use for precise definition of detailed sea-level fluctuations is still rare. Here we report twelve high-precision thermal ionization mass spectrometric 230Th ages for twelve rims of five mid-Holocene microatolls from an emerged reef terrace at Leizhou Peninsula, northern South China Sea. This is a tectonically stable area, enabling us to reconstruct both the timing and trajectory of local sea-level fluctuations accurately. The elevations of these microatoll rims and cores were accurately determined relative to the surface of modern living microatolls at the same site. The results indicate that the sea level during the period of 7050–6600 yr bp (years before AD 1950) was about 171 to 219 cm above the present, with at least four cycles of fluctuations. Over this 450 yr interval, sea level fluctuated by 20–40 cm on century scales.

Type
Short Paper
Copyright
University of Washington

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