用MnO/TiO_2指标探讨安徽巢湖二叠系海陆相的变化

ON MARINE TO NON-MARINE FACIES TRANSFORMATION OF THE PERMIAN SEDIMENTATION IN THE CHAOHU LAKE, ANHUI PROVINCE, WITH THE APPLICATION OF MnO/TiO_2 INDEX

本文在系统地化学分析资料基础上,应用MnO/TiO_2比值,对安徽巢湖二叠系海陆相的变化和主要的沉积相类型进行了研究。所得结论与C/S比值、δ^(13)C以及古生物和岩石地层沉积环境的综合分析结论是基本吻合的。从而证明了MnO/TiO_2比值可以作为辨别海洋沉积物沉积环境的一项有效的地球化学标志,而用其来探讨地层海陆相的变化是可行的。

Based on the data of systematic chemical analyses, the transformation between the non-marine facies in the Permian system of the Chaohu Lake, Anhui Province are discussed paper, with the application of MnO/TiO2 ratio. The results obtained are basically consistent those from C/S ratio, 13C,as well as the synthetic analyses of palaeontology and the sedimentary vironmcnt of petrostratigraphy. Therefore, it is in evidence that MnO/TiO2 can be regarded as fective geochemical index for defining the depositional cnvironment of marine sediments and is available for studying on the changes between marine and non-marine facies.