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山西梨园金矿位于太行山构造-岩浆-多金属成矿带上,矿体赋存于北北东向的构造带中,矿床热液作用包括石英脉阶段(A)、石英-黄铁矿阶段(B)、石英-多金属硫化物阶段(C)和石英-碳酸盐阶段(D)。B、C、D阶段的石英中发育3类包裹体:气液两相包裹体(Ⅰ型)、水溶液-CO2包裹体(Ⅱ型)以及纯CO2包裹体(Ⅲ型)。B阶段发育Ⅰ型包裹体、部分Ⅱ型及Ⅲ型包裹体,均一温度集中于230~350℃,盐度为1.82%~12.63%;C阶段发育Ⅰ型包裹体,Ⅱ型及Ⅲ型包裹体明显增多,均一温度集中于200~330℃,盐度为1.82%~9.71%;D阶段主要发育Ⅰ型包裹体,均一温度集中于140~170℃,盐度为1.16%~9.58%。包裹体气相成分含有较高密度的CO2和CO、N2、H2、CH4等,液相成分主要为Ca2+、Na+、K+、SO42-、Cl-、F-。估算成矿压力为68~114 MPa,对应的捕获温度为200~430℃,估算最大成矿深度为4.3km。梨园金矿成矿流体为低盐度、中低温、富CO2的Ca2+(Na+、K+)-SO42-(Cl-、F-)-H2O-CO2体系,可能为后期岩浆热液流体。矿床形成于陆内造山环境,为受断裂破碎带控制的岩浆热液蚀变岩型金矿。
The Shanxi Liyuan Gold Mine is located on the Taihangshan tectonic-magmatic-polymetallic metallogenic belt. The ore body occurs in the north-north-easterly structural belt. The hydrothermal fluids include quartz vein (A), quartz-pyrite ( B), quartz-polymetallic sulphide phase (C) and quartz-carbonate phase (D). There are three kinds of inclusions in quartz in B, C and D stages: gas-liquid two-phase inclusions (type I), aqueous solution-CO2 inclusions (type II) and pure CO2 inclusions (type III). Type I inclusions, partial type II and type III inclusions developed in stage B, the homogenization temperature was concentrated in the range of 230-350 ℃, and the salinity was 1.82% ~ 12.63%. Type C inclusions, type Ⅱ and type Ⅲ inclusions The homogenization temperature was concentrated in the range of 200 ~ 330 ℃ and the salinity was 1.82% ~ 9.71%. Type Ⅰ inclusions mainly developed in stage D, with the homogenization temperature of 140-170 ℃ and the salinity of 1.16% -9.58%. The gas phase composition of the inclusions contains high-density CO2 and CO, N2, H2, CH4, etc. The liquid components are mainly Ca2 +, Na +, K +, SO42-, Cl- and F-. The estimated metallogenetic pressure is 68-114 MPa and the corresponding capture temperature is 200-430 ° C. The maximum mineralization depth is estimated to be 4.3 km. The ore-forming fluid in Liyuan Gold Mine is a low-salinity, low-temperature and CO2-rich Ca2 + (Na +, K +) - SO42- (Cl-, F-) - H2O-CO2 system and may be a late magmatic hydrothermal fluid. The ore deposit is formed in intracontinental orogenic environment and is a magmatic hydrothermal alteration rock type gold deposit controlled by the fracture and fracture zone.