招平断裂带上盘金矿床石英流体包裹体同位素组成特征及地质意义

Isotope geochemistry of fluid inclusions within quartz vinces of gold deposits in the hanging wall for Zhaoping fault

招-平断裂是胶东招掖金矿带的主要控矿断裂,其上盘金矿床受 NE 向断裂构造控制,赋矿围岩为胶东群变质岩,金矿化以含金硫化物石英脉为主。通过首次对招远灵雀山金矿床富金石英脉石英流体包裹体 Rb-Sr 等时线年龄的测定,获得116±23Ma 成矿年龄。从而说明招-平断裂带上盘金矿大规模成矿期发生于早白垩世的构造体系转折期。对富金石英脉石英流体包裹体同位素特征研究表明。该地区成矿热液均以幔源为主,具有与招掖金矿带其它金矿类似的成矿热液系统。由此可以看出招-平断裂带上盘也具有良好的成矿条件。

Zhao-Ping gold belt zone is one of the major gold mineralization zones in Jiaodong. The gold deposits are located in the hanging wall of the Zhao Ping gold belt zone, occur mainly in the Jiaodong rock group. The ores are mainly of the auriferous quartz vein type hosted in NE trending fractures and faults. The Rb-Sr isochron dating methods were adopted to date deposit, the result indicate that the age of the Lingqueshan gold deposit is 116 ±23 Ma. That is to say, the large-scale principal mineralization period of the Zhao- Ping fluid zone hanging wall took place in early cretaceous. According to research of geological characteristica of deposit and analysis of fluid inclusion of quartz, this area mineralogenetic heat fruit is mainly mantle fountain, and participated in a certain degree of magma water and atmosphere water, has the same mineralogenetic hear fruit system with the other Zhaoye gold deposit.