What Caused the Inconsistency between Rb-Sr and^(40)Ar-^(39)Ar Ages of Authigenic Illites?

作     者：Entao Liu I.Tonguc Uysal Jian-Xin Zhao Zi'ao Zhang Xudong Lin Entao Liu;I.Tongu? Uysal;Jian-Xin Zhao;Zi'ao Zhang;Xudong Lin

作者机构：Hubei Key Laboratory of Marine Geological ResourcesChina University of GeosciencesWuhan 430074China Radiogenic Isotope FacilitySchool of Earth and Environmental SciencesThe University of QueenslandBrisbaneQld4072Australia Department of Geological EngineeringIstanbul University-CerrahpaşaIstanbul34098Turkey 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2022年第33卷第5期

页      面：1145-1151页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学] 

基　　金：supported by the National Natural Science Foundation of China(Nos.42072142 41702121 U19B2007) 

主　　题：authigenic illite isotope dating Rb−Sr isochron ^(40)Ar-^(39)Ar dating inconsistency geochemistry 

摘      要：Radiogenic isotope dating of illitic clays has been widely used to reconstruct thermal and fluid flow events in siliciclastic sedimentary basins,the information of which is critical to investigate mechanisms of hydrocarbon *** study carried out Rb-Sr and^(40)Ar-^(39)Ar dating of authigenic illitic clay samples separated from the Palaeogene sandstone in the northern South China *** Rb-Sr data further confirm the previously reported three periods of fluid flow events(at 34.5±0.9,31.2±0.6,and 23.6±0.8 Ma,respectively)in the northern South China Sea,which are related to regional episodic ***,^(40)Ar-^(39)Ar ages of illite obtained in this study are significantly younger than the corresponding Rb-Sr *** significantly younger^(40)Ar-^(39)Ar ages were probably due to ^(40)Ar loss caused by later dry heating events on the Hainan Island that have not affected the Rb-Sr isotopic *** inconsistency between Rb-Sr and^(40)Ar-^(39)Ar data should be attributed to different isotopic behaviors of K-Ar and Rb-Sr isotopic systematics in *** results indicate that Rb-Sr isotopic dating method may be a preferential approach for clay dating in geological settings where exist younger dry heating events.