内蒙古乌日尼图钼铜矿床辉钼矿铼—锇同位素定年及其地质意义  

Re-Os isotopic dating of molybdenite from the Wurinitu molybdenum-copper deposit in Sonid Zuoqi,Inner Mongolia and its geological significance

作　　者：白珏[1,2] 张可[1,3] 

机构地区：[1]中矿资源勘探股份有限公司,北京100089 [2]中国地质大学(北京),北京100083 [3]中国地质科学院矿产资源研究所,北京100037

出　　处：《矿产勘查》2013年第6期671-677,共7页Mineral Exploration

基　　金：国家重点自然科学基金项目(编号:41030421);地质调查项目(编号:1212010911029)共同资助

摘　　要：乌日尼图钼铜矿床位于大兴安岭成矿带,钼矿化主要与中细粒花岗岩有密切关系,辉钼矿主要呈细脉浸染状分布于中细粒花岗岩中.通过对5件辉钼矿样品进行的铼—锇同位素分析,获得同位素等时线年龄为（134±14）Ma,前人研究成果表明花岗岩的成岩年龄为（134±14）Ma,综合矿床地质特征,推测乌日尼图钼铜矿床的形成时间为（133 ～ 134） Ma前后,属燕山早期构造—岩浆活动的产物.The Wurinitu molybdenum-copper porphyry deposit is located in the Daxinganling metallogenic belt.The molybdenum mineralization is closely associated with the medium-fine grained granite.The molybdenite mianly occurs in the granite as disseminated and vienlets forms.Five molybdenite samples were collected from different ores for the analysis on Re-Os isotopic dating.The obtained isochron age is about （134 ± 14） Ma.By comparing with the previous isotope age of the granite intrusion as （133.6 ± 3.3） Ma,it can be concluded that the Wurinitu molybdenum-copper deposit was formed in the early Cretaceous period and it is derived from the Early Yanshanian tectono-magmatic activities.

关 键 词：大兴安岭 乌日尼图钼铜矿 辉钼矿 铼—锇同位素定年 燕山期 

分 类 号：P597[天文地球—地球化学] P618.65[天文地球—地质学]