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

基金项目:

国土资源地质大调查项目资助（1212010633903）

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

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。
- 琅琊山铜矿； /
- 辉钼矿； /
- 铼-锇同位素定年
Abstract: 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.
- the /
- Langyashan /
- copper