我国中新元古代地层研究中若干问题的探讨

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

以叠层石作为生物地层学研究的主要手段 ,并分析了一些新的同位素年龄和其他古生物学资料 ,对 3个中新元古代地层问题进行了讨论 : 1)从元古宙叠层石总体发育过程及陡山沱组新发现的资料看 ,中国南方震旦系(指南沱 ,陡山沱和灯影组 )在层位上应位于胶辽徐淮区的金县群之上 ; 2 )在震旦纪南沱冰期前 ,大约在辽南纪中晚期 ,一起高温氧化并伴随强蒸发事件波及胶辽徐淮区 ; 3)对燕山 ,胶辽徐淮和扬子区中新元古代沉积的构造背景进行了分析。

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.