云南羊拉铜矿床里农花岗闪长岩体锆石U-Pb年龄、矿体辉钼矿Re-Os年龄及其地质意义  

U-Pb dating of zircon from the Linong granodiorite,Re-Os dating of molybdenite from the ore body and their geological significances in Yangla copper deposit,Yunnan

作　　者：杨喜安[1] 刘家军[1] 韩思宇[1] 张红雨[1] 罗诚 汪欢[1] 陈思尧[1] 

机构地区：[1]中国地质大学地质过程与矿产资源国家重点实验室,北京100083 [2]云南迪庆矿业开发有限责任公司,德钦674507

出　　处：《岩石学报》2011年第9期2567-2576,共10页Acta Petrologica Sinica

基　　金：国家重点基础研究发展计划(2009CB421003;2009CB421005);高等学校学科创新引智计划项目(B07011)联合资助

摘　　要：位于中咱-中甸板块和昌都-思茅板块之间金沙江构造带中部的羊拉铜矿床,是三江地区的一个十分典型的大型铜矿床。羊拉铜矿床与里农花岗闪长岩体具有密切的成因联系,通过对里农花岗闪长岩体进行LA-ICP-MS锆石U-Pb同位素年代学和里农矿段KT2矿体中辉钼矿Re-Os同位素年代学的研究,获得2件花岗闪长岩体样品的LA-ICP-MS锆石U-Pb同位素年龄分别为234.1±1.2Ma(MSWD值为0.66)和235.6±1.2Ma(MSWD值为0.66);里农矿段KT2矿体中辉钼矿的模式年龄为230.9±3.2Ma。前者代表了成岩年龄,后者代表了成矿年龄,说明羊拉铜矿床成矿年龄稍晚于成岩年龄。上述成果有助于进一步查明羊拉铜矿床的成因类型与并指导找矿。The Yangla copper deposit,situated in the middle section of Jinshajiang joint belt between Zhongza-Zhongdian plate and Changdu-Simao plate,is a representative and giant copper deposit that has been discovered in Jinshajiang-Lancangjiang-Nujiang region in recent years.There are coupled relationship between Linong granodiorite and copper mineralization in the Yangla copper deposit.LA-ICP-MS zircon U-Pb dating has revealed that the ages of two samples from the Linong granodiorites are 234.1±1.2Ma（MSWD=0.66） and 235.6±1.2Ma（MSWD=0.66）,respectively.Molybdenite Re-Os model age for the KT2 ore body in Linong ore block is 230.9±3.2Ma.The former represents the diagenetic age of the Linong granodiorite,the latter represents the metallogenic age of the Yangla copper deposit,the result shows that the metallogenic age is close to diagenetic age,but a little later.It is the significance for finding out genetic type of the Yangla copper deposit and prospecting.

关 键 词：花岗闪长岩 LA-ICP-MS定年 Re-Os年代学 羊拉铜矿床 云南 

分 类 号：P597.3[天文地球—地球化学]