Dating Model of Illite Grain Rb-Sr Isochron and Its Application to Precambrian Stratigraphy  

作　　者：Li Yunjun Institute of Geology, Academia Sinica, Beijing Jia Zhongpeng 

出　　处：《Acta Geologica Sinica(English Edition)》1989年第1期93-102,共10页地质学报（英文版）

基　　金：This research was financially supported by the Academia Sinica Foundation

摘　　要：This paper discusses the Rb-Sr geochemical behaviour of illites in the sedimentary process, and points out that illites of the lmd and lm types could reach Sr-isotopic equilibrium with its environmental medium during the sedimentary process and initial stage of diagenesis, and illite grains of different sizes have various Rb contents. A new dating method for sedimentary rocks----a dating model of illite grain Rb-Sr isochron----is established, in consideration of the geochemical process of Sr-isotopic homogenization and differentiation in the course of their formation and evolution. In addition, the paper concerns the application of the dating model to the Precambrian unmetamorphosed sedimentary rocks in western Henan Province, which gives satisfactory results coincident with the geological facts.This paper discusses the Rb-Sr geochemical behaviour of illites in the sedimentary process, and points out that illites of the lmd and lm types could reach Sr-isotopic equilibrium with its environmental medium during the sedimentary process and initial stage of diagenesis, and illite grains of different sizes have various Rb contents. A new dating method for sedimentary rocks----a dating model of illite grain Rb-Sr isochron----is established, in consideration of the geochemical process of Sr-isotopic homogenization and differentiation in the course of their formation and evolution. In addition, the paper concerns the application of the dating model to the Precambrian unmetamorphosed sedimentary rocks in western Henan Province, which gives satisfactory results coincident with the geological facts.

关 键 词：Dating Model of Illite Grain Rb-Sr Isochron and Its Application to Precambrian Stratigraphy Sr Rb 

分 类 号：P5[天文地球—地质学]