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胶东乳山金矿含金石英脉中的锆石具有较高的普通铅(206Pbc=2.00%~15.88%)和Th/U比值(0.31~1.35),其壳-幔部捕获的流体包裹体与含金脉石英中的流体包裹体类型相同,表明锆石形成于高Th/U比值的成矿热液环境,SHRIMP法U-Pb测定结果表明,含金脉石英中热液锆石的形成年龄为1173Ma,与前人在胶东其他地区金矿床获得的成矿年龄相接近,代表了乳山金矿的热液成矿时间;围岩昆嵛山二长花岗岩中锆石的形成年龄为1603Ma,表明金矿床形成与二长花岗质岩浆侵位事件无直接关系,采用SHRIMP法直接测定含金石英脉中热液锆石的U-Pb年龄,可用来限定热液成因金矿床的成矿时代.
The zircons in the gold-bearing quartz veins of the Rushan Gold Deposit in Jiaodong City have higher Pb (206Pbc = 2.00% -15.88%) and Th / U ratio (0.31-1.35), and the fluid inclusions trapped in the crust-mantle are similar to the The types of fluid inclusions in the Au-quartzite are the same, indicating that the zircon was formed in the ore-forming hydrothermal environment with high Th / U ratio. The SHRIMP U-Pb results show that the formation age of the zircons 1173Ma, which is close to the mineralization ages of the predecessors in the gold deposits in other areas of Jiaodong, representing the hydrothermal mineralization time of the Rushan gold deposit. The age of formation of zircon in the Kunyu Shan monzonitic granite is 1603Ma, The formation of the deposit is not directly related to the granodiorite magma emplacement event. The U-Pb dating of the hydrothermal zircons in the gold-bearing quartz veins by SHRIMP method can be directly used to limit the mineralization age of the hydrothermal gold deposit.