新疆阿克提什坎金矿床铅同位素地球化学

Plumbum isotope geochemistry of Aketishikan gold deposit,Xinjiang

阿克提什坎金矿床位于阿尔泰诺尔特地区南缘东段 ,金矿床赋存于下石炭统红山嘴组地层中 ,区内出露有二长花岗岩体。阿克提什坎金矿床不同地质体铅同位素特征表明 ,矿床铅不是单一来源的正常铅 ,而是混合型多来源的异常铅。矿石铅既具有地幔铅的特征 ,又具有上地壳铅的特征 ,并且具有造山带铅的特点 ,成矿作用与造山作用关系密切 ,铅来源于造山带物质 ,本质上是壳幔混合铅。阿克提什坎金矿床矿石铅同位素符合三元混合模型 ,三端元为地幔铅、上地壳铅及地层铅。

The Aketishikan gold deposit is located in the east of the southern Nurt area of Altay.The gold deposit occurs in Lower Carboniferous Hongshanzui Formation and there is an admellite.The plumbum isotope characteristics of the geological bodies in the Aketishikan gold deposit show that the plumbum of deposit was the abnormal plumbum, not the normal plumbum, and the sources of the plumbum were complicated. The plumbum of ores have some characteristics of the plumbum of Earth's mantle and some characteristics of the plumbum of Upper Earth's crust. The plumbum of ores belongs to the orogenic belt plumbum ,essentially is the mixture plumbum of Earth's mantle and crust.The plumbum originates from the orogenic belt and the metallization has relationship with the orogeny. The plumbum isotope of ores conform the mixture model of three components, the plumbum of Earth's mantle, the plumbum of Upper Earth's crust and the plumbum of strata in the Aketishikan gold deposit.