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Discussion on Some Problems in the Mesoproterozoic and Neoproterozoic Stratigraphical Study in China

CAO Rui ji (Nanjing Institute of Geology and Palaeontology, the Chinese Academy of Sciences, Nanjing, 210008)  
Based on the study of stromatolites, new isotopic datings and discoveries of other fossil groups, this paper deals with the following three problems about Mesoproterozoic and Neoproterozoic stratigraphy: (1) The Sinian System (Nantuo, Doushantuo and Tongying Formations) in S. China should be, according to the evelutionary process of the abundant and diverse stromatolites and other data, underlatin by the Jinxian Group in Jiao Liao Xu Huai region; (2) An high temperature and oxygenic event in association with evaporation happened before the Nantuo glacial, roughly in the middle late stage of Liaonan period, and spread over Jiao Liao Xu Huai region; (3) The tectonic background of Mesoproterozoic and Neoproterozoic sedimentation of Yanshan, Jiao Liao Xu Huai and Yangtze regions was analysed and presumed.
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