自生伊利石同位素年代学在钾盐矿床中的应用展望  

Prospects for the application of authigenic illite geochronology in potash deposits

作　　者：沈立建[1] SHEN Li-jian(MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China)

机构地区：[1]中国地质科学院矿产资源研究所,自然资源部成矿作用与资源评价重点实验室,北京100037

出　　处：《岩石矿物学杂志》2023年第5期691-700,共10页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金项目(41802111,42272108);中央级公益性科研院所基本科研业务费专项(KK2005);地质调查局地质矿产调查评价专项项目(DD20190606);国家重点基础研究发展计划(973)项目(2011CB403007)。

摘　　要：伊利石是一种层状硅酸盐矿物,层间主要为钾离子,可利用K-Ar法、Ar-Ar法和Rb-Sr法等相关的测年方法来分析和限定与自生伊利石有关的地质事件的时代,例如盆地演化历史、热液活动、构造活动和油气运移。本文讨论了利用钾盐矿床中自生伊利石进行蒸发岩地层年代学研究的可能性。虽然多数研究表明温度是控制自生伊利石形成的主要控制因素,即自生伊利石一般形成于温度较高的条件下,但一些研究表明在地表温度的盐湖环境中也可形成自生伊利石,此种环境下控制自生伊利石形成的主要因素为流体成分。这构成了利用自生伊利石定年来研究蒸发岩地层时代的理论基础。然而在实际研究过程中仍存在很多问题,需进行进一步的研究。As a phyllosilicate,illite could fix K^(+)within interlayers.Thus K-Ar,Ar-Ar and Rb-Sr dating methods could be used to investigate and constrain the ages of different geologic events accompanying the formation of authigenic illite.Currently,it is significant to utilize authigenic illite to study the thermal evolution history of sedimentary basins,hydrothermal activities,tectonic movements,and hydrocarbon migration.This paper discusses the possibility of dating formation ages of evaporites by using isotope dating of illites from potash deposits.Although most studies showed that the formation of authigenic illite is favoured in high temperature environment,some authigenic illites could be formed in the salt lake environment of surface temperature.In this case,the controlling factor of the formation of illite is fluid composition.It is the theoretical basis for the study of evaporite formation age by using isotope chronology of authigenic illite.However,many challenges remain in practical research,requiring further investigation.

关 键 词：盐湖 自生伊利石 同位素测年 钾盐矿床年代学 

分 类 号：P578.959[天文地球—矿物学] P619.211[天文地球—地质学]