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Magnetic susceptibility variations of the Ediacaran cap carbonates in the Yangtze platform and their implications for paleoclimate

中国海洋湖沼学报（英文版）2005，Vol.23Issue(3)：291-298,8.

Magnetic susceptibility variations of the Ediacaran cap carbonates in the Yangtze platform and their implications for paleoclimate

作者信息

1. State key Laboratory of Geological Processes and Mineral Resources;Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education, China University of Geosciences, Beijing 100083, China;State key Laboratory of Geological Processes and Mineral Resources;Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education, China University of Geosciences, Beijing 100083, China;Department of Geoscience, University of Nevada, Las Vegas, NV89154-4010,USA;State key Laboratory of Geological Processes and Mineral Resources;Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education, China University of Geosciences, Beijing 100083, China
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摘要

Abstract

Magnetic susceptibility (MS) data were obtained from 11 sections of the Doushantuo (Ediacaran) cap carbonate that directly overlies the Nantuo glacial diamictite in the southeastern margin of the Yangtze platform. The MS data revealed two regionally correlatable peaks at the bottom and top of the cap carbonate, separated by an interval of low values. The lower MS peak coincides with high percentage of insoluble siliciclastic residues that are compositionally identical to the matrix of the underlying diamictite, suggesting its origin controlled mainly by detrital components during the first phase of cap carbonate deposition at the end of the glaciation. The upper MS peak is associated with high clay content and iron sulfides, and can be interpreted as either derived from enhanced greenhouse weathering that could have brought more terrigenous components into the ocean, or the result of ocean anoxia at the late stage of cap carbonate deposition that could led to formation of abundant iron sulfides. The regionally consistent MS curves from the cap carbonates provided the first geophysical record for the rapid climate change from icehouse to greenhouse conditions in the aftermath of the Neoproterozoic "snowball Earth" event.

关键词

Yangtze platform/Doushantuo Formation/cap carbonates/magnetic susceptibility (MS)/paleoclimate

Key words

Yangtze platform/Doushantuo Formation/cap carbonates/magnetic susceptibility (MS)/paleoclimate

分类

海洋科学

引用本文复制引用

..Magnetic susceptibility variations of the Ediacaran cap carbonates in the Yangtze platform and their implications for paleoclimate[J].中国海洋湖沼学报（英文版）,2005,23(3):291-298,8.

基金项目

This work was supported by the National Natural Science Foundation(Grant No.40032010B). （Grant No.40032010B）

中国海洋湖沼学报（英文版）

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ISSN：2096-5508

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