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.
出处
《岩矿测试》
CAS
CSCD
北大核心
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)
关键词
琅琊山铜矿
辉钼矿
铼-锇同位素定年
the Langyashan copper deposit
molybdenite
Re-Os isotopic dating
