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上芒岗金矿是滇西地区具代表性的红色粘土型金矿。依据堆积特征、矿物组合和化学成分 ,可将红色粘土剖面分为 6个带 ,即表土带、坡积带、钙华 -沼泽带、残积带、腐泥岩带和基岩带。其中 ,腐泥岩带为岩溶坍塌成因 ,残积带由岩溶残积形成 ,钙华 -沼泽带和坡积带为地表水流搬运堆积。矿床成因为在中晚燕山期形成的原生卡林型金矿化基础上 ,经第三纪上新世的岩溶、残积和坡积作用的预富集 ,由不彻底的红土化作用使金以硫代硫酸盐络合物的形式活化迁移到粘土层的中下部 ,被低价铁锰离子所还原而再沉淀富集形成
Upper Mangang Gold Mine is a representative of the western Yunnan red clay type gold mine. The red clay profile can be divided into six zones, ie, topsoil, peridotropical zone, travertine-swamp zone, residual zone, saprolite zone and bedrock zone, according to the characteristics of accumulation, mineral assemblage and chemical composition. Among them, the sapropelic zone is the cause of karst collapse, the residual zone is formed by karst residuals, and travertine-swamp zone and slope-plot zone are transported by surface water. On the basis of the primary Carlin-type gold mineralization formed during the middle and late Yanshanian period, the ore deposit was pre-enriched by the karst, residual and slope products in the Pliocene of the Tertiary. Due to the incomplete lateriteification, The thiosulfate complex is activated and migrated to the middle and lower parts of the clay layer, reduced by low-cost Fe-Mn ions and re-precipitated and enriched