安徽滁州琅琊山铜矿辉钼矿铼-锇同位素定年及其地质意义  

Re-Os Isotopic Dating of Molybdenite from the Langyashan Copper Deposit in Chuzhou of Anhui Province and Its Geological Significance

作　　者：秦燕[1] 梅玉萍[2] 王登红[3] 张建[1] 吴礼彬[4] 

机构地区：[1]中国地质科学院研究生院,北京100037 [2]中国地质调查局宜昌地质矿产研究所,湖北宜昌443003 [3]中国地质科学院矿产资源研究所,北京100037 [4]安徽省地质调查院,安徽合肥230000

出　　处：《岩矿测试》2009年第3期259-264,共6页Rock and Mineral Analysis

基　　金：国土资源地质大调查项目资助(1212010633903);中国成矿体系综合研究项目资助(1212010634002)

摘　　要：首次运用铼-锇同位素方法对滁州琅琊山铜矿床中的辉钼矿进行定年。5件辉钼矿样品的模式年龄为(128.9±1.8)Ma～(130.3±1.9)Ma,187Re-187Os等时线年龄为(128.6±2.2)Ma,其加权平均方差(MSWD)为0.45,为滁州琅琊山铜矿床提供了准确的形成时限。分析结果表明,滁州琅琊山铜矿床是早白垩纪(燕山晚期)区域构造-岩浆活动的产物。琅琊山铜矿床辉钼矿中铼含量较高,推断成矿物质主要是壳幔混源,且主要是幔源。A precise Re-Os age is given for the Langyashan copper deposit in Chuzhou. The model age for five molybdenite samples from the deposit varies from （128.9 ± 1.8） Ma to （130.3 ± 1.9） Ma and the isochron age is （128.6 ±2.2） Ma, MSWD =0.45. The results indicate that the origin of the deposit is from regional tectno- magmatic activities during the early cretaceous period. The molybdenites from the Langyashan copper deposit have a very high Re content, which indicates that the deposit originated from the mixing of the crust and the mantle sources with the mantle as a primary source.

关 键 词：琅琊山铜矿 辉钼矿 铼-锇同位素定年 

分 类 号：P579.3[天文地球—矿物学] P578.291[天文地球—地质学]