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

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Chinese Journal of Oceanology and Limnology 2005年第3期23卷 291-298页

作者： WU Huaichun ZHANG Shihong JIANG Ganqing LI Haiyan State key Laboratory of Geological Processes and Mineral Resources Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of EducationChina University of Geosciences Beijing 100083China Department of Geoscience University of NevadaLas VegasNV 89154-4010USA

Magnetic susceptibility(MS)data were obtained from 11 sections of the Doushantuo(Edicaran)cap carbonate that directly overlies the Nantuo glacial diamictite in the southeastern margin of the Yangtze *** MS data revealed two regionally correlatable peaks at the bottom and top of the cap carbonate,sepa-rated by an interval of low *** 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 con-trolled mainly by detrital components during the first phase of cap carbonate deposition at the end of 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 *** regionally consistent MS curves from the cap carbonates provided the first geo-physical 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) paleocli-mate

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