收稿日期: 2019-11-19
修回日期: 2019-12-01
网络出版日期: 2020-02-12
基金资助
同济大学海洋地质国家重点实验室自主项目(MG20190101)
Dating Methods of Cold-water Corals and Their Application in Reconstructing Carbon-reservoir Ages of Intermediate and Deep Oceans
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)
冷水珊瑚古环境应用研究的首要问题是建立精确的年龄模式。目前常用的珊瑚定年技术包括U/Th,AMS 14C和210Pb测年，其中前两种方法尤为重要。不同冷水珊瑚属种适用不同的定年方法。高镁方解石质的竹节柳珊瑚可用AMS 14C和210Pb测试方法定年。竹节柳珊瑚具有清晰的生长纹层，厘定其年龄模式后，可以成为中—深层大洋环境演变的高分辨率记录载体。文石质石珊瑚同时适用于U/Th和AMS 14C测年方法，在古海洋研究中有特殊价值。由于u/Th测年可以提供样品的绝对年龄，因此进一步计算可获得中—深层大洋的碳储库年龄，这为探究轨道和千年时间尺度上大洋—大气碳交换这一重大学术问题提供了可靠资料。冷水珊瑚测年数据发现末次冰消期时，赤道大西洋和南大洋中层水的碳储库年龄在Heinrich Stadial 1事件结束前后突然大幅度减小，很可能表示深部大洋一部分无机碳转移进入了大气圈，或者代表Heinrich Stadial 1事件前后大西洋中层水分别主要受南半球和北半球潜沉水团的影响。
黄恩清 , 孔乐 , 田军 . 冷水珊瑚测年与大洋中—深层水碳储库[J]. 地球科学进展, 2019 , 34(12) : 1243 -1251 . DOI: 10.11867/j.issn.1001-8166.2019.12.1243
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.
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