江西省大余县西华山岩体锆石SHRIMP U-Pb测年及其意义  

Zircon SHRIMP U-Pb dating of Western Huashan pluton in Dayu County, Jiangxi province and its significance

作　　者：张敏 肖剑 

机构地区：[1]江西有色地质矿产勘查开发院,江西南昌330000

出　　处：《世界有色金属》2017年第19期263-265,共3页World Nonferrous Metals

摘　　要：西华山钨矿床位于江西大余西华山复式岩体的西南部,是产于花岗岩体内脉钨矿床的典型矿床之一,与西华山钨矿成矿关系密切的主要为二期侵入的中粒黑云母花岗岩及一期侵入的斑状中粒黑云母花岗岩,厘清上述两期花岗岩的年龄对研究西华山钨矿的成矿时代有重要意义。应用单颗粒锆石离子探针质谱仪(SHRIMP)方法,对中粒黑云母花岗岩和斑状中粒黑云母花岗岩进行精确的锆石U-Pb测年。结果表明,中粒黑云母花岗岩锆石^(206)Pb/^(238)U年龄的加权平均值为150.3±2.2Ma,斑状中粒黑云母花岗岩锆石^(206)Pb/^(238)U年龄的加权平均值为152.6±2.1Ma。Xihua mountain Jiangxi large tungsten deposit is located in the southwest of Western Huashan complex, is one of the typical deposit in granite body vein tungsten deposits, has close relationship with the West Huashan tungsten mineralization is mainly the two phase intrusive medium grained biotite granite and porphyritic intrusive medium grained biotite granite, has important significance study on the metallogenic epoch of West Huashan tungsten mine to clarify these two granite ages. The application of Single Zircon ion microprobe mass spectrometer（SHRIMP） method, the medium grained biotite granite and porphyritic biotite granite zircon grains in U-Pb precise dating. The results show that the weighted medium grained biotite granite zircon ^（206）Pb/^（238）U age of the average value is 150.3 ± 2.2 Ma, weighted porphyritic medium grained biotite granite zircon ^（206）Pb/^（238）U age of the average value was 152.6 ± 2.1 Ma.

关 键 词：西华山钨矿 花岗岩 SHRIMP锆石U-PB测年 

分 类 号：P597.3[天文地球—地球化学]