End-Permian catastrophic event of marine acidification by hydrated sulfuric acid:Mineralogical evidence from Meishan Section of South China

查看全文 作　　者：LIANG HandongKey Laboratory of Coal Resources, China University of Mining and Technology, Beijing 100083, China (e-mail: hdl6688@sina.com)

出　　处：《Chinese Science Bulletin》索引2002年第47卷第16期,共5页

基　　金：This work was partly supported by the National Natural Science Foundation of China (Grant Nos. 40072055 and 40043010). 摘　　要：The event Permian-Triassic boundary (EPTB) is well marked by the famous 'white clay' of bed 25 in Mei-shan Section located in Changxing county, Zhejiang province of China. In this note, the white clay as well as its overlying and underlying sequences is investigated particularly for mineralogical records. The investigation yields three findings that contribute to better understanding the scenario of the EPTB mass extinction. (i) A red goethite-rich microlayer (0.3 mm) is first recognized to be horizontally widespread on the base of the white clay in the section. The microlayer should be considered as a macro geochemical indicator naturally tracing a catastrophic initiation at the EPTB. (ii) An interruption of marine carbonate deposition is discovered due to blank of carbonate minerals in the white clay. The discovery provides significant evidence of a marine acidification event that would occur in the paleo-ocean with marine acidity estimated at pH<4.0 at least and be triggered by the ultimate 关键词：mass extinction MARINE ACIDIFICATION hydrated sulfuric acid MEISHAN Section GOETHITE carbonate blank CATASTROPHIC event.

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End-Permian catastrophic event of marine acidification by hydrated sulfuric acid:Mineralogical evidence from Meishan Section of South China

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