海洋钙同位素分馏机制及其古海洋学应用

吴能友; 张必东; 邬黛黛

doi:10.1167/j.issn.1001-8166.2015.04.0433

地球科学进展 >

2015 , Vol. 30 >Issue 4: 433 - 444

DOI: https://doi.org/10.1167/j.issn.1001-8166.2015.04.0433

海洋钙同位素分馏机制及其古海洋学应用

吴能友 ,
张必东 ,
邬黛黛

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1 中国科学院天然气水合物重点实验室,中国科学院广州能源研究所,广州 510640
2 中国科学院大学,北京100049

作者简介：吴能友(1965-),男,浙江东阳人,研究员,主要从事海洋地质研究工作. E-mail:wuny@ms.giec.ac.cn

*通讯作者：张必东(1989-),男,湖南湘潭人,硕士研究生,主要从事海洋地球化学研究. E-mail:bdzhang@mail.ustc.edu.cn

收稿日期: 2014-10-31

修回日期: 2015-03-09

网络出版日期: 2015-04-20

基金资助

国家自然科学基金项目“南海北部冷泉区AOM驱动的硫早期成岩循环作用及其对甲烷渗漏环境识别研究”(编号：41273022);中国科学院广州能源研究所所长创新基金培育专项“南海北部天然气水合物成藏的实验与表征研究”(编号：y307p51001)资助

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, 2015,

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Fractionation Mechanism and Paleoceanographic Applications of Calcium Isotopes in Marine Settings

Nengyou Wu ,
Bidong Zhang ,
Daidai Wu

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1.Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640 China
2. University of Chinese Academy of Sciences, Beijing, 100049 China

Received date: 2014-10-31

Revised date: 2015-03-09

Online published: 2015-04-20

Copyright

地球科学进展编辑部, 2015,

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摘要

钙在海洋中是离子浓度仅次于钠和镁的金属元素,在海洋生物过程及矿物形成中都占据重要的地位。随着同位素分析仪器精度的提高,钙同位素等非常规稳定同位素的研究逐渐成为地球化学的热[JP2]门,钙同位素在海洋环境中的分馏机制及其在古海洋学中的应用研究不断完善。系统介绍了钙同位素高精度分析的方法和原理,海洋环境中无机成因和有机成因2种钙同位素分馏的机制和应用;通过大量的文献调研综述了钙同位素地球化学研究在古海洋参数恢复上的应用。通过有孔虫Globigerinoides sacculifer的钙同位素具有对温度敏感、温感公式简单、后生成岩作用对其影响小和分析材料完整易得等优点,并同其他传统地质温度计联用,为古海洋研究提供精确的海洋表面温度(Sea Surface Temperature,SST);利用钙同位素值温度相关性较小的钙质壳体来恢复古海洋钙通量;利用无机成因碳酸盐岩盖帽的钙同位素恢复海水CO^2-₃浓度和研究甲烷渗漏对古海洋环境的影响。

关键词： 钙同位素; 地球化学; 分馏机制; 古海洋

本文引用格式

吴能友 , 张必东 , 邬黛黛 . 海洋钙同位素分馏机制及其古海洋学应用[J]. 地球科学进展, 2015 , 30(4) : 433 -444 . DOI: 10.1167/j.issn.1001-8166.2015.04.0433

Abstract

The concentration of calcium is only below sodium and magnesium among metalions, which plays a crucial role in biological processes and the formation of minerals. As analytic accuracy has been increasing, studies of calcium isotopes now become hot focus. Fractionation mechanism and paleoceanographic applications of calcium isotopes in marine settings are perfected with time. Globigerinoides sacculifer is the most promising proxy allied with other proxies of sea surface temperature because its calcium fractionation being sensitive to temperature, with simple formulas and resistant to diagenesis and it is also accessible to test. Those who are not sensitive to temperature in fractionation can be used to recover calcium budget. Inorganic calcium carbonates are promising to evaluate the influences that seepage of methane may exert on paleo-climate.

Key words： Calcium isotopes; Geochemistry; Fractionation mechanism; Paleoceanography.

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