山西刁泉银铜多金属矿床辉钼矿Re-Os同位素年龄及其地质意义  

Molybdnite Re-Os age of Diaoquan silver-copper polymetallic deposit in Shanxi Province and its geological significance

作　　者：牛翠祎[1,2] 卿敏[2] 唐明国[1,2] 李超[3] 张玉杰[2] 李艳秋[2] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]中国人民武装警察部队黄金地质研究所,河北廊坊065000 [3]国家地质实验测试中心,北京100037

出　　处：《矿床地质》2013年第5期972-978,共7页Mineral Deposits

基　　金：国家危机矿山"晋东北-内蒙古中部地区火山岩型金多金属矿床成矿规律总结研究"(项目编号:20089925)项目的资助

摘　　要：为了查明山西刁泉银铜多金属矿床矿化发生的时间,作者采集了6件辉钼矿样品进行Re-Os同位素测试,获得等时线年龄为(131.9±2.9)Ma,MSWD=1.7,样品的加权平均年龄为(132.01±0.85)Ma,MSWD=1.05,略晚于矽卡岩型铜矿化形成的时间。山西刁泉银铜矿床成矿地质年龄,与晋东北地区燕山期火山-次火山岩形成的时间基本相同,说明次火山岩体与成矿关系密切,次火山岩体为刁泉银铜矿床的形成提供了成矿物质和热源。刁泉银铜矿床的形成时间与华北地台大规模成矿时代一致,形成于板内构造环境,为华北地台深部岩石圈减薄背景下古老造山带活化的产物,形成于华北地台东部构造体制转换时期。In order to date the metallogeny of the Diaoquan silver-copper polymetallic deposit,the authors selected and analyzed six molybdnite samples from this ore deposit.The Re-Os isotopic model ages range from 130.5 Ma to 132.8 Ma,with an isochron age of（131.9±2.9）Ma（MSWD=1.7）and an weighted average age of（132.01 ±0.85）Ma（MSWD=1.05）.The molybdnite was formed at 132 Ma,later than the formation of copper minerals.The rock-forming and ore-forming processes of the Diaoquan silver-copper polymetallic deposit took place simultaneously with the Yanshanian volcanic and subvolcanic activities in northeastern Shanxi,which suggests that the sub-volcanic rocks had close relationship with metallogeny and provided metallogenic matter and heat for the Diaoquan silver-copper deposit.The Diaoquan silver-copper polymetallic deposit was formed during the largescale metallogenic activity in the northeast platform and occurred in a continental intraplate tectonic setting.As a result of re-activation of ancient orogeny under the background of thinning of the deep lithosphere,the Diaoquan deposit was formed during the transformation of tectonic regime in the east of the northeast platform.

关 键 词：地球化学 辉钼矿RE-OS年龄 同位素 银铜矿 山西刁泉 

分 类 号：P618.52[天文地球—矿床学] P618.41[天文地球—地质学]