地球科学进展

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2022 , Vol. 37 >Issue 11: 1194 - 1203

DOI: https://doi.org/10.11867/j.issn.1001-8166.2022.087

IODP研究

有孔虫钕同位素的来源及其古海洋学意义

  • 吴琼 ,
  • 刘志飞 ,
  • 马瑞芳
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  • 1.河海大学海洋学院, 江苏 南京 210098
    2.同济大学海洋地质国家重点实验室, 上海 200092
    3.中国科学院西北生态环境资源研究院冰冻圈科学国家重点实验室, 甘肃 兰州 730000
吴琼（1985-），女，安徽安庆人，讲师，主要从事海洋地质学研究. E-mail：qiongwu@hhu.edu.cn

收稿日期: 2022-10-08

  修回日期: 2022-10-19

  网络出版日期: 2022-11-16

基金资助

国家自然科学基金项目“南海中—北部有孔虫钕的迁移行为及其示踪古洋流可行性研究”(42176058)

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Sources of Foraminiferal Neodymium Isotopes: Implications for Paleoceanography

  • Qiong WU ,
  • Zhifei LIU ,
  • Ruifang MA
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  • 1.College of Oceanography, Hohai University, Nanjing 210098, China
    2.State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
    3.State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
WU Qiong (1985-), female, Anqing City, Anhui Province, Lecturer. Research area includes marine geology. E-mail: qiongwu@hhu.edu.cn

Received date: 2022-10-08

  Revised date: 2022-10-19

  Online published: 2022-11-16

Supported by

the National Natural Science Foundation of China “Assessment of foraminiferal Neodymium behavior in the central-northern South China Sea and its implications for past deep-waters hydrology studies”(42176058)

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摘要

有孔虫钕同位素是重建深层洋流演化的重要替代性指标。钕在有孔虫碳酸钙壳体及其自生组分（如铁锰氧化物）中存在差异性富集。有孔虫自生组分中钕的含量远高于碳酸钙壳体， 是有孔虫钕同位素的主要载体。有孔虫自生组分主要形成于底层海水—沉积物界面，并富集底层海水钕同位素。但在沉积物成岩作用过程中，沉积环境的氧化还原状态发生转变，有可能造成有孔虫自生组分钕同位素发生释放—再吸附的循环变化，并与孔隙水交换，有孔虫自生组分指示的底层海水钕同位素受到影响。因此，在利用有孔虫钕同位素指示古洋流演化时，应同时分析有孔虫和陆源碎屑沉积物的稀土元素分布特征及钕同位素的演变趋势，以排除沉积成岩作用的影响。

关键词： 有孔虫; 钕同位素; 古海洋

本文引用格式

吴琼 , 刘志飞 , 马瑞芳 . 有孔虫钕同位素的来源及其古海洋学意义[J]. 地球科学进展, 2022 , 37(11) : 1194 -1203 . DOI: 10.11867/j.issn.1001-8166.2022.087

Abstract

Foraminiferal neodymium (Nd) isotopes are powerful proxies for reconstructing past deep-water currents. Nd isotopes were differentially enriched in foraminiferal calcite and associated authigenic phases (i.e., Fe-Mn oxides). The Nd concentration in the authigenic phases was higher than that in foraminiferal calcite, indicating that authigenic phases are the main carriers of foraminiferal Nd. Authigenic phases associated with foraminifera are generally formed at the seawater-sediment interface, from where they begin to adsorb Nd from the bottom water. During the diagenesis of sediments, the redox state of the sedimentary environment can be changed, resulting in the release and re-adsorption cycling of Nd isotopes in authigenic phases and the exchange with pore fluids, which further impacts the bottom water Nd isotope record in foraminiferal authigenic phases. Therefore, when using foraminiferal Nd isotopes to trace past bottom-water mixing, it is necessary to analyze the evolution of parallel rare earth elements and Nd isotopes extracted from foraminifera and detrital fractions to eliminate the influence of diagenesis on foraminiferal Nd isotopes.

Key words： Foraminifera; Neodymium isotopes; Paleoceanography.

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