Paleoenvironmental implications of the calcium isotope characteristics in the MD81349 from the Nintyeast Ridge in the Indian Ocean

WANG Feng; FANG Nianqiao; HU Chaoyong; GOLDSMITH Sarah; XU Yonghang; DING Xuan; WANG Aijun; CHEN Ping; BAO Rui

doi:10.1007/s13131-018-1264-7

赤道东经90°海岭活塞柱状心钙同位素曲线特征及其古环境意义

doi: 10.1007/s13131-018-1264-7

1.
国家海洋局第三海洋研究所, 厦门, 361000
2.
中国地质大学(北京)海洋学院, 北京, 100083
3.
中国地质大学(武汉)地球科学学院, 武汉, 430074
4.
Demo Laboratory, Ctd. MicroMass, Mantchestt M139PL, United Kingdom
5.
安徽理工大学, 淮南, 232001
6.
Laboratoire de Sciences du Climat et de l'Environnement, CNRS, Gif-Yvette, 75000, France

基金项目: The National Programme on Global Change and Air-sea Interaction under contract Nos GASI-03-04-01-03 and GASI-GEOGE-03; the Research Grant of Third Institute of Oceanography, State Oceanic Administration under contract No. 2015015.

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- 收稿日期: 2017-10-23

Paleoenvironmental implications of the calcium isotope characteristics in the MD81349 from the Nintyeast Ridge in the Indian Ocean

1.
Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
2.
Institute of Marine Geology and Geophysics, China University of Geosciences (Beijing), Beijing 100083, China
3.
School of Earth Sciences, China University of Geosciences, Wuhan 430074, China
4.
Demo Laboratory, Ctd. MicroMass, Mantchestt M139PL, United Kingdom
5.
School of Earth Science Environmental Engineering, Anhui University of Science and Technology, Huainan 232001, China
6.
Climate and Environment Sciences Laboratory of the institute Pierre Simon Laplace (LSCE), Gif sur Yvette 75000, France

摘要

摘要: 钙元素作为岩石圈与水圈中的常见组分之一，其同位素分布特征所代表的古海洋学意义迄今尚未得到深入开发。我们提取300kyrBP以来东经90°海岭钙质生物软泥中的浮游有孔虫Globogerinoides sacculifer壳体的δ⁴⁴Ca曲线，结合研究区若干活塞柱状心的粒度、磁化率、浊积层频数、碳酸盐含量等指标所反映的陆源物质的输入状况和生物颗粒含量、Neogloboquadrina dutertrei含量等指标所反映的海洋生产力的发育状况，发现曲线的变化特征与海水中钙元素收支状态的历史演变关系密切：在陆源碎屑供应最为充分的氧同位素第6期δ⁴⁴Ca处于低值区并仅发生小幅振荡，在第3、5、7期内值域较高且波动特征与各项生产力指标的变化趋势较为一致。这种现象表明，喜马拉雅剥蚀物向北印度洋的输入对于研究区钙同位素的变化起到主要的控制作用；同时，钙质浮游生物的发育程度对海水钙同位素比值的波动也可产生次级影响。
- 赤道东经90°海岭、钙同位素、古海洋学
Abstract: A δ⁴⁴Ca curve from shells of the planktonic foraminifera Globigerinoides sacculifer in calcareous biogenic oozes has been extracted from the Nintyeast Ridge in the Indian Ocean since 300 ka. By combining terrigenous inputs (e.g., grain size, magnetic susceptibility, and turbidite frequency) with the oceanic productivity (e.g., biogenic content and Neogloboquadrina dutertrei content), it is found that the curve's variations are closely related to the historical evolution of the oceanic calcium cycle. The δ⁴⁴Ca value is in lower tendency and has small oscillation during Marine Isotope Stage (MIS) 6, when the supply of terrigenous detrital is highest. In contrast, during MIS 3, 5 and 7, the δ⁴⁴Ca values are in higher tendency, and their fluctuations are consistent with the variations of the productivity proxies. These results suggest that the calcium isotopes are mainly influenced by the input of the Himalayan erosion products to the northern Indian Ocean. In addition, the developmental stages of calcareous planktons may have a secondary impact on the fluctuations of the calcium isotope ratio of sea water.
- Nintyeast Ridge

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赤道东经90°海岭活塞柱状心钙同位素曲线特征及其古环境意义

doi: 10.1007/s13131-018-1264-7

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Paleoenvironmental implications of the calcium isotope characteristics in the MD81349 from the Nintyeast Ridge in the Indian Ocean

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