岩矿显微组构对水银洞金矿成因的指示

THE INDICATIVE FUNCTION OF MICRO FABRICS OF ROCKS AND ORES TO THE ORIGIN OF THE SHUIYINDONG GOLD DEPOSIT

黔西南水银洞金矿为产于上二叠统龙潭组中的超大型、高品位金矿床,矿床由多个金矿体组成。工业金矿体顺层产于龙潭组含煤地层所夹的玄武质、硅质、生物碎屑碳酸盐岩中。对水银洞金矿赋矿地层岩石以及矿石显微组构进行了研究,矿石中主要载金矿物为细粒黄铁矿,具再生边、粒内孔隙、铸模孔隙结构及镶边生物矿化构造、铸模式生物矿化构造,是一典型的具沉积-成岩组构。金矿化与硅化有密切的成因联系,金与SiO2来源于峨嵋山玄武岩的喷溢活动,主要金矿体更多显示与峨嵋山玄武岩准同生特征。矿床为沉积-成岩弱改造成因金矿床。

The Shuiyindong gold deposit, which occurs in the Longtan Formation of the Upper Permian series, is a super-large, high-grade gold ore deposit. The deposit consists of a number of gold ore bodies which occur in basaltic, siliceous and bioelastic carbonate rocks in the Longtan Formation coal measures. Research on the micro fabrics of rocks and ores indicated that the main gold-carrying mineral is fine-grained pyrite, which possesses regenerated rims, intragrain holes, mold hole fabrics, furring biomineralization structure and mold biomineralization structure. There is a close genetic connection between gold mineralization gold and silieitication. Gold and SiO2 were derived from effu- sion of the Emei basalt and the main gold bodies mostly show penecontemporaneous characteristics with the Emei ba- salt. The Shuiyindong gold deposit is of sedimentary diagenesis weakly reworking origin.