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滇南地区建水县境内的白显锰矿,是国内主要的放电锰矿生产矿山。该矿自五十年代以来,断续进行过地质勘探工作,以往对矿床成因多认为是受变质的沉积富锰矿。根据近年来勘探实践,笔者认为该矿床富集成矿是在表生氧化阶段,即矿床形成的主要因素不是原生沉积,也不是变质作用,而是表生氧化富集。一、矿区地质(图1) (一)地层矿区地处华南褶皱系右江褶断区滇东南拗褶带南西端。出露地层为二叠至三叠系,矿体(矿层)赋存于中三叠系法郎组。该组可分三个岩性段十四个亚段,厚达1320米。按岩石组
Jiannan County in southern Yunnan Bai Xian manganese ore, is the main production of manganese ore mine. Since the 1950s, the mine has carried out intermittent geological exploration work. In the past, the genesis of the deposit was considered to be metamorphic sedimentary and manganese-rich ore. According to the exploration practice in recent years, the authors believe that the mineralization of this deposit is the epigenetic oxidation stage, that is, the primary factor of deposit formation is not primary sedimentation, nor metamorphism, but epiphytic oxidation and enrichment. First, the mining geology (Figure 1) (A) strata mine is located in the South China fold of the Youjiang fold fault zone southeastern fold belt south west end. The exposed strata are Permian to Triassic and the orebodies (ore layers) occur in the Triassic Franks. The group can be divided into three lithology segments fourteen sub-segments, up to 1320 meters thick. By rock group