黔西南水银洞卡林型金矿地质地球化学特征及成因

黔西南水银洞金矿位于灰家堡背斜西段,是灰家堡卡林型金矿成矿带的重要组成部分。矿体呈层状、似层状产出于灰家堡背斜轴部附近300 m范围内的二叠系龙潭组大孔隙度生物碎屑灰岩中,形态与背斜形态基本一致。组成矿体的矿石矿物主要有黄铁矿、毒砂、雄黄及雌黄等。硅化、白云石化、黄铁矿化与金矿关系极为密切。同位素地球化学特征表明,该矿的成矿物质主要来自深部。通过对水银洞金矿成矿地质条件的研究,系统总结出该矿床的成矿条件为:特殊的大地构造背景;有利的容矿岩石组合;深部丰富的成矿物质和成矿流体来源。该研究为区内相同类型的金矿勘查工作提供了思路。

Geological-geochemical features and genesis of Shuiyindong Carlin gold deposit in southwestern Guizhou Province

The Shuiyindong gold deposit is located in the western section of Huijiabao antiline, and it is an important component of Huijiabao Carlin ore field. The orebodies occur in stratified or stratoid shape in high-porosity bioclastic limestone of the Upper Permian Longtan Formation within 300 m near the axis of the Huijiabao anticline. The shape of the orebodies is similar with that of the anticline. The main metal minerals are pyrite, arsenopyrite, realgar and orpiment. The gold mineralization related closely with silicification, dolomitization and pyritization. The geochemical study of isotopes indicates that the ore-forming materials mainly originated from plutonic source. Based on metallogenic condition of the Shuiyindong gold deposit, it is proposed that special tectonic background, favorable hosting rock assemblage and rich ore-forming materials and fluids are favorable conditions for gold mineralization. These are helpful for further understanding of Carlin gold mineralization, and can provide useful recommendations for reasonable exploration of gold resources in southwestern Guizhou Province.