贵州水银洞金矿的几点新认识  

Some New Grasp of the Shuiyindong Gold Deposit in Guizhou Province

作　　者：任涛[1] 张兴春[2] 韩润生[1] 胡煜昭[1] 

机构地区：[1]昆明理工大学,国土资源工程学院,云南昆明650093 [2]中国科学院地球化学研究所,矿床地球化学国家重点实验室,贵州贵阳550002

出　　处：《地质与勘探》2013年第2期217-223,共7页Geology and Exploration

基　　金：国家自然科学基金项目(编号41203039);昆明理工大学成矿动力学及隐伏矿预测创新团队(2008)联合资助

摘　　要：水银洞金矿是滇黔桂"金三角"已知最富的、特大型卡林型金矿床,矿体赋存于二叠统龙潭组的大孔隙度生物碎屑灰岩中。镜下观察发现水银洞金矿含有五种不同类型的黄铁矿:草莓状黄铁矿、细粒黄铁矿、粗粒黄铁矿、生物状黄铁矿和长条状黄铁矿。草莓状黄铁矿为沉积成因,与金矿化关系不大;细粒黄铁矿、生物状黄铁矿和条带状黄铁矿为热液型黄铁矿;而粗粒黄铁矿由沉积型和热液型黄铁矿共同组成,内核为沉积型黄铁矿(Py1),被外带的热液型黄铁矿包裹(Py2),成环带构造。电子探针波谱分析发现,该矿床中Au主要赋存于热液黄铁矿(含砷黄铁矿)中。本研究从新的视角分析了黄铁矿的形成和含金硫化物分解的相互制约,吸附作用、电化学作用可能是卡林型金矿床中金沉淀的主要机制。The Shuiyindong gold mine is one of the largest and richest Carlin-type deposit in the Yunnan-Guizhou-Guangxi ＂ gold triangle＂ area, whose orehodies occur in the hlgh-porosity bioclastie limestone of the Permian Longtan Fro.. Microscope observations see five kinds of pyrites ： framboidal, fine-grained, coarse-grained, bioelastic and banding ones. The framboidal pyrite is of sedimentary genesis, little related with the gold mineralization. The fine-grained, bioclastic and banding pyrites are of hydrothennal genesis, while the coarse-grained pyrite is of sedimentary and hydrothermal genesis. The coarse-grained euhedral pyrite has a sedimentary-type core that is enclosed by the hydrothermal arsenic pyrite. The baekscattered images show that the gold mainly occurs in the hydrothermal arsenic-rich pyrite. The distribution of pyrites and gold-bearing sulfide suggests that adsorption and electrochemical processes are the possible mechanism for the formation of the Carlin-type gold deposits.

关 键 词：卡林型金矿 黄铁矿 水银洞 贵州 

分 类 号：P618.51[天文地球—矿床学]