吉林省板庙子金矿床地质特征及流体包裹体研究

板庙子金矿床是位于吉林省白山地区一重要的大型岩金矿床。通过对矿床地质特征的研究表明,该矿床热液矿化阶段可划分为的4个阶段,金的主要富集成矿阶段为Ⅱ、Ⅲ阶段。流体包裹体研究表明:矿区成矿Ⅱ阶段石英中主要发育气液二相包裹体,包裹体均一温度为190.8~236.4℃,盐度为3.6%~5.9%,密度为0.87~0.92 g/cm3;成矿Ⅲ阶段重晶石矿物中主要发育气液二相及单液相2种类型的包裹体,包裹体均一温度为151.9~178.9℃,盐度为1.7%~4.1%,密度为0.92~0.94 g/cm3。板庙子金矿床成矿流体为中低温、低盐度、较高密度的Na Cl-H2O体系热液,主要来自于大气降水,属中低温热液型金矿床。

Research on geological characteristics and fluid inclusions of Banmiaozi Gold Deposit in Jilin province

Banmiaozi Gold Deposit is an important large rock gold deposit which is located in Baishan region of Ji-lin province. Studies indicate that hydrothermal mineralization stage can be divided into four ore-forming stages and that gold was enriched in stageⅡandⅢ. Fluid inclusion research indicates that in stageⅡ,gas-liquid two-phase in-clusions mainly grow in quartz with a homogenization temperature in the range from 190 . 8 ℃ to 236 . 4 ℃, salinity from 3. 6 % to 5. 9 %,and density from 0. 87 g/cm3 to 0. 92 g/cm3; in stage Ⅲ,gas-liquid two-phase and liquid phase inclusions grow in barites,in which inclusions have a homogenization temperature in the range from 151. 9 ℃ to 178. 9 ℃,salinity from 1. 7 % to 4. 1 %,density from 0. 92 g/cm3 to 0. 94 g/cm3 . Ore-forming fluid in Banmiaozi gold deposit is a medium low temperature,low salinity and relatively high density NaCl-H2 O systematic hydrothermal fluid,mainly stemming from atmospheric precipitation. The deposit belongs to a medium low temperature hydrothermal deposit.