吉林四平银(金)矿床Rb-Sr定年及热液活动的时间跨度  

Rb－Sr ISOTOPE AGE AND THE TIME SCALE OF HYDROTHERMAL ACTIVITIES FOR THE SIPING Ag(Au) DEPOSIT,JILIN PROVINCE

作　　者：梁华英[1] 王秀璋[1] 程景平[1] 

机构地区：[1]中国科学院广州地球化学研究所,广州五山510640

出　　处：《大地构造与成矿学》2001年第2期194-198,共5页Geotectonica et Metallogenia

基　　金：国家自然科学基金( 48972035);国家"九五"攀登计划预选项目( 95-y-25)

摘　　要：四平银（金）矿床石英包裹体 Rb－Sr等时线年龄 187± 4 Ma，表明首期成矿作用发生在燕山早期，矿床 Rb－Sr等时线年龄与蚀变绢云母 K－Ar年龄差异及不同矿段矿化特征差异表明，蚀变绢云母 K－Ar年龄反映后期热液成矿事件时代，四平银（金）矿床至少经历了两期热液成矿事件，首期成矿事件发生在燕山早期，晚期成矿事件发生在燕山中期，成矿热液活动时间跨度约 33 Ma。Rb－Sr isochron age of quartz from the Siping ore－bodies is 187± 4 Ma,reflecting that the first stage mineralization occurred in the early Yanshanian period.The difference between the Rb－Sr isochron age and the K－Ar age (145～ 154 Ma) of sericite from alteration rock,together with mineralization features,indicates that the Siping Ag(Au) deposit was formed by two stage mineralizing events,the first stage is 187 Ma,the second stage is 145～ 154 Ma.The time scale of thermal fluids activities is about 33 Ma.

关 键 词：银金矿床 成矿时代 成矿作用 银同位素 石英包裹体 铷同位素 成矿热液 

分 类 号：P618.52[天文地球—矿床学] P618.51[天文地球—地质学]