鄂西二叠纪孤峰组碳酸盐结核的成因研究

通过对研究区孤峰组碳酸盐结核的岩石学和地球化学特征的研究,认为碳酸盐结核是一种成岩结核,在成岩的早中期形成,结核的形成是不同期次的。结合正常浅海型综合生物地球化学响应成岩模式分析碳酸盐结核形成于滞留贫氧还原的环境,主要在硫酸盐还原带形成,其为透入性生长模式,碳酸盐胶结物在整个结核中同时成核结晶生长。

Study on origin of the carbonate concretions of The Permian Gufeng Formation in western Hubei

Through the petrologic and geochemical characteristics of the carbonate concretions,the study ananlyses is that the carbonate concretions are diagenetic concretions and they were fomed in the middle diagenetic.The formation of the carbonate concretions is multistage.Combined with normal shallow diagenetic type comprehensive biogeochemical response pattern analysis,the carbonate concretions formed in the stranded and anoxic environment.They mainly formed in sulfate-reducing zone .They grown as penetrative pattern.Carbonate cements in the carbonate concretions were crystallized and grown at the same time.