埃塞俄比亚施瑞地区VMS型铜金矿床黄铁矿成因及矿物学特征研究

施瑞铜金矿床成因尚不清楚,通过光学显微镜、粉末衍射及同位素分析等手段对施瑞铜金矿床中不同世代黄铁矿进行成因矿物学特征研究。结果表明,研究区黄铁矿可划分为2个世代,具有不同的标型特征,2个世代黄铁矿成因类型分别为火山-次火山热液成因、变质热液成因。施瑞地区经历了新元古代早期的火山-次火山热液以及新元古代后期的变形变质阶段,含矿热液流体由火山-次火山热液阶段的热液流体演化为火山-次火山热液和变质热液混合阶段的双源流体。

Genesis and mineralogy of pyrite in the VMS copper-gold deposit in Shirui area, Ethiopia

The genesis of the Shirui copper-gold deposit is unclear. The genesis and mineralogical characteristics of different generations of pyrite in the Shirui copper-gold deposit were studied by means of optical microscopy, powder diffraction, and isotope analysis. The results show that the pyrite in the study area can be divided into two generations with different type characteristics. The genesis types of the two generations are volcano-subvolcanic hydrothermal origin and metamorphic hydrothermal origin. The Shirui area experienced volcano-subvolcanic hydrothermal fluid in the early Neoproterozoic period and the metamorphic metamorphic stage in the late Neoproterozoic period. Mineral-containing hydrothermal fluid evolved from volcanic-subvolcanic hydrothermal fluid to volcanic-subvolcanic thermal Dual-source fluid in the liquid and metamorphic hydrothermal mixing stage.