河南栾川三道庄钼钨矿床石榴石的矿物学特征研究

摘要

The Sandaozhuang Mo-W deposit in Luanchuan County, Henan province, is one of the giant Mo-W deposits in the East Qinling molybdenum belt. The stratford ore body was hosted in skarn. By means of the field survey, the microscopic observation and EPMA, mineralogical characteristics of the major skarn mineral such as garnet and pyroxene were investigated. Electron probe analysis show that the end member of garnet in the ore deposit is dominated by andradite-grossularite. From the previous researches on geological characteristics and geochronology and the results of this study, the authors hold that the Sandaozhuang ore deposit is a typical skarn deposit. During the deposit formation, the salinity and temperature of ore-forming fluid gradually decrease, while oxygen fugacity and pH gradually increase from early to late.%三道庄钼钨矿床位于河南省栾川县，为东秦岭多金属成矿带上的大型钨钼矿床之一。矿体赋存于矽卡岩中，以似层状产出。根据野外矽卡岩的产出状态，显微镜观察结合电子探针分析对三道庄钨钼矿床中矽卡岩的主要组成矿物石榴石进行了矿物学特征研究。石榴子石电子探针分析结果表明，石榴石属于钙铁榴石-钙铝榴石系列。结合前人的矿床地质、成矿年代学、流体包裹体研究及本次研究结果，认为该矿床为典型的矽卡岩成因类型。矿床形成过程中成矿流体经历了从早到晚温度和盐度下降，而pH值和氧逸度上升的过程。