【作者】 陈学明； 邓军； 林棕； 沈崇辉；

【Author】 Chen Xueming Deng Jun Lin Zong Shen Chonghui(China University of Gfosciences, Beijing)

【机构】 中国地质大学；

【摘要】 白牛厂银锡铅锌硫化物矿体赋存在中寒武统海相细碎屑岩中,矿床的形成经历了中寒武世海底喷溢沉积成矿作用和燕山期酸性岩浆热液叠加成矿作用,是我国极具特色的细碎屑岩建造中Sedex型矿床.与金属硫化物伴生的浅色锡石中In₂O₃质量分数高达3%,In以类质同象形式存在.矿层中Sn-Ag相关系数为0.88,其Sn-Ag空间分布关系密切.富铟锡石不仅可作为低压物化环境的标型矿物,而且可作为锡石多金属硫化物矿床找银的重要线索.更多还原

【Abstract】 Bainiuchang ore-bearing basin is a fault-controlled depression of an aulacogen. ore-bodies occur in fine grained clastic formation of middle Cambrain and are a Sedex deposit. The main orebodies exist in the stratiform forms, and some slump structures occur in sulfide accumulations. The ore texture and structure in the main orebodies are laminated and clastic related to sedimentary. The sulfides in sedimentary orebodies often show interbedded and rhythmetic textures . Some aggregates show abrasion and impaction features, and some show an ever more complex history of sedimentation-diagenesis-rewash and redeposition. The cassiterite related to the sedimentation is characterized by high content of In, and the avarage of In is 1. 84% . The decrepitation temperatures of the fluid inclusions range from 80t to 350C and the contents of salts range from 10% to 15%. Indium occurs at the cassiterite in form isomorphism, and it is a sign of minerogenic environment in low pressure. Result of phase analysis show that silver occurs at the galena mainly in form of independent mineral. The space distribution of silver is related to the cassiterite enriched In and the relation coefficient of Sn and Ag is 0.88, therefore the cassiterite enriched In in the cassiterite-sulphide deposit is one of ore guides for prospecting silver.更多还原