Dating Methods of Cold-water Corals and Their Application in Reconstructing Carbon-reservoir Ages of Intermediate and Deep Oceans

  • Enqing Huang ,
  • Le Kong ,
  • Jun Tian
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  • State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092,China
Huang Enqing (1984-), male, Fuqing City, Fujian Province, Associate professor. Research areas include paleoceanography and paleoclimatology. E-mail:ehuang@tongji.edu.cn

Received date: 2019-11-19

  Revised date: 2019-12-01

  Online published: 2020-02-12

Supported by

the State Key Laboratory of Marine Geology, Tongji University(MG20190101)

Abstract

Establishing a precise chorology is a critical issue when employing cold-water coral as paleoenvironmental archives. Currently, U-Th, 14C and 210Pb dating techniques are the most frequently used methods. The high-magnesium calcite skeleton of bamboo coral has clear growth bands, which is appropriate for 14C and 210Pb dating methods and holds a great potential to be high-resolution archives of mid-to-deep ocean evolution. Aragonitic stony coral is appropriate for both U-Th and 14C dating methods, which is valuable in paleoceanographic research. Because the U-Th method can provide the absolute chronology of coral samples, it can further be used to calculate the 14C age of ocean carbon reservoirs. Therefore, U-Th and 14C dating results of stony coral are currently the most reliable data for exploring the evolution of ocean carbon reservoirs through the Last Glacial Maximum to the present. It has been found that the 14C ventilation ages of intermediate water masses of the equatorial Atlantic and Southern Ocean significantly decreased at the end of the Heinrich Stadial 1. This suggests a massive carbon transfer from deep oceans to the atmosphere, or the Atlantic intermediate depths were ventilated by the southern- and the northern-sourced water masses, respectively, before and after the Heinrich Stadial 1.

Cite this article

Enqing Huang , Le Kong , Jun Tian . Dating Methods of Cold-water Corals and Their Application in Reconstructing Carbon-reservoir Ages of Intermediate and Deep Oceans[J]. Advances in Earth Science, 2019 , 34(12) : 1243 -1251 . DOI: 10.11867/j.issn.1001-8166.2019.12.1243

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