胶东金矿床成矿流体、稳定同位素及成矿时代研究进展

胶东金矿成矿具有"多期叠加,时空集中,规模巨大"的显著特征,胶东金矿床在成矿流体性质、成矿时代上具有一致性。各类矿床不同蚀变带、各成矿阶段的流体包裹体类型主要有H2OCO2包裹体、富CO2包裹体和H2O溶液包裹体,各成矿阶段具有不同的流体包裹体类型组合,成矿流体为中低温、低盐度的CO2-H2O-NaCl流体。稳定同位素研究表明,成矿流体可能源于统一的流体库——壳幔相互作用过程的流体系统,成矿晚期有大气降水混入。胶东地区岩浆活动主要集中于152~160Ma(玲珑花岗岩)、126~130Ma(郭家岭花岗岩)和108~118.8Ma(伟德山花岗岩)等3个时期,主成矿期年龄集中于112~127Ma,成矿主要与郭家岭和伟德山花岗岩有关。

The research progress of ore-forming fluids, stable isotope and mineralizing age in Jiaodong peninsular of eastern China

Gold metallogeny in Jiaodong peninsular area is characterized by multi-stage,age-space concentration and huge scale.Based on researches on the previous data of gold deposits in the area we consider that a gold deposit is similar in its ore-forming fluid characteristics and mineralizing age.Fluid inclusion data show that occur mainly the H2O-CO2fluid inclusions,CO2-rich fluid inclusions and aqueous fluid inclusions in different alteration zones and different mineralization stages of various gold deposits.Each stage has its own fluid inclusion combinations.Generally the ore-forming fluid is characterized by CO2-H2O-NaCl fluid with medium-low temperature and low salinity.The study of stable isotope indicates that the ore-forming fluid may come from the same fluid reservoir,which was produced by the interaction of crust and mantle and it is incorporated with late meteoric water.Magmatism in Jiaodong area was mainly focused on stages of 160-152Ma（Linglong granite）,130-126Ma（Guojialing granodiorite）and 118.8-108 Ma（Weideshan granodiorite-granite）,and mineralizing age can be fixed at 127-112Ma.Gold mineralization is mainly related to Guojialing granite and Weideshan granite.