山东蓬莱地区侯格庄金矿床流体包裹体特征

Characteristics of Fluid Inclusion of Hougezhuang Gold Deposit in Penglai Area in Shandong Province

摘要:

侯格庄金矿床位于胶东栖（霞）蓬（莱）金成矿带大柳行金矿田东南部。该文采用包裹体显微测温方法对金矿石中石英矿物内残留的流体包裹体进行研究，总结了金矿石石英矿物中的流体包裹体特征，并对该矿床成矿流体来源、矿床成因进行了研究。研究表明，该矿床石英矿物中流体包裹体以纯液包裹体为主，次为H2OCO2气液两相包裹体及H2OCO2三相包裹体，未见含子矿物包裹体。均一温度在109～396℃，盐度在2.9～22.44wt％NaCl，密度在0.64～1.06g/cm3之间，估算成矿压力为128～340MPa，成矿深度约4.4～11.6km。该矿床至少经历了2个矿化期次，成矿流体为中低温、低盐度、低密度流体，流体来源于天水与岩浆水的混合产物，属中低温、中浅成热液矿床。

Abstract:

Hougezhuang gold deposit is located at the southeast of Daliuhang gold field in Qixia-Penglai metallogenic belt. In this paper, fluid inclusions in quartz minerals in gold deposits have been studied by means of microscopic thermometry of inclusions. The characteristics of fluid inclusions have been summarized in detail. The source of ore-forming fluid and the origin of the deposit have been studied for the first time. It is showed that the fluid inclusions in quartz minerals of the deposit are mainly liquid single-phase inclusions, and secondly are H2O-CO2 two-phase inclusions and three-phase inclusions, but brine fluid inclusion can not be found. The homogenization temperature is 109～396℃, the salinity is 2.9～22.44wt.％NaCl, the density is 0.64~1.06g/cm3, the pressure is 128～340Mpa, and the mineralization depth is about 4.4～11.6km. The deposit has experienced at least two mineralization stages, the ore-forming fluid is a medium-low temperature, low salinity and low density fluid. The ore-forming fluids originated from mixing products of convecting meteoric fluids and magmatic fluids. It belongs to medium-low temperature, mesothermal epithermal deposit.