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吉林延边小西南岔铜金矿床北山矿段新发现的钼矿体呈规模较小的石英脉,空间上与相邻铜金矿体平行,它们受相同的构造体系控制。钼矿石中金属矿物以辉钼矿为主,并明显被黄铜矿和黄铁矿沿裂隙、晶隙充填交代,表明其形成于该矿床大规模铜金矿化的早期阶段。该石英脉中发育富气相、气液二相以及含子矿物多相包裹体,成矿流体为中高温(300～380℃)、高盐度(12.99%～47.36%NaCleqv)的NaCl-H2O体系,成矿流体曾发生过沸腾现象,表现出大规模铜金矿化早阶段的成矿流体特征。结合前人相关资料认为,北山矿段的辉钼矿石英脉应是该矿床大规模铜金矿化早期阶段的产物。该认识为小西南岔铜金矿床同位素测年及成矿机制深入研究奠定了理论基础。
The newly discovered molybdenum ore body in the Beishan ore section of the Xiaoxi’nancha copper-gold deposit in Jilin City is in the form of a relatively small quartz vein that is spatially parallel to neighboring copper-gold ore bodies and is controlled by the same tectonic system. The molybdenum ore is dominated by molybdenite and is obviously confined by fractures and interspaces filled by chalcopyrite and pyrite, indicating that it was formed in the early stages of large-scale copper-gold mineralization in this deposit. The quartz vein is rich in gas-phase, gas-liquid two-phase and multi-phase inclusions of ore-bearing minerals. The ore-forming fluids are NaCl-H2O system with high salinity (12.99% -47.36% NaCleqv) , The ore-forming fluid has undergone boiling phenomenon and shows the characteristics of ore-forming fluid in the early stage of large-scale copper-gold mineralization. Based on the previous data, it is concluded that the quartz vein of molybdenite in the Beishan ore section should be the product of the early stage of large-scale copper-gold mineralization in this deposit. This understanding lays a theoretical foundation for the further study of the isotope dating and metallogenesis of the Xiaoxinancha copper-gold deposit.