北祁连西段寒山金矿床铅同位素等时线年龄及意义

The Pb Isotopic Isochrone Age of the Hanshan Gold Deposit and Its Exploration Significance,the Western Segment of North Qilian Orogenic Belt

北祁连西段寒山金矿床位于阿尔金断裂南侧,赋存于阿尔金断裂南侧的北西西向次级断裂中。对于该矿床的成矿时代一直存在很大争议,为此根据北祁连西段寒山金矿床中43个金矿石样品的铅同位素分析数据,获得的铅同位素等时线年龄为(404±7)Ma。通过与之相距仅7km的鹰咀山金矿床有关资料的对比,认为它们的成矿时代相同,这一发现对该区今后的找矿工作有一定的指导意义。

The Hanshan gold deposit is located in the south side of the Altyn Tagh fault belt, within its NWW secondary fault zone. Previous studies are controversial at the formation age of the Hanshan gold deposit. Hence, this paper reports the Pb isotopic data of the 43 ore samples from the Hanshan gold deposit in the western segment of north Qilianshan Mountain, the data yielded a well Pb isotopic isochrone age of （404±7）Ma. Integrating the available data from the Yingzuishan gold deposit, - 7 km from the Hanshan, it＇s believed the two gold deposits formed in the same mineralization stage. The study results are of great significance for further metallogenic prognosis and exploration in the area.