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所研究的金富集出现在巴西马托格罗索州境内覆盖在前寒武系库亚巴组片岩上的红土中。这些红土从底部到顶部可分为五层:(1)灰蓝色蚀变片岩;(2)红色泥质蚀变砂矿物层;(3)以在富氢氧化铁的基质和粘土中富含氢氧化铁的砾石和石英碎屑为特征的层;(4)铁壳;(5)现代土壤。人们发现,紧贴在铁壳下面的第三层的金含量最有意义。根据地质研究和金颗粒形态的观测结果,目前所开采的这种金矿被认为是两种作用共同作用的结果,即赋存在片岩中的石英矿脉的铁铝蚀变作用和红色泥质蚀变砂矿物层联合作用所致,这种蚀变砂矿物层起到了不透水构造的作用,使大的金颗粒在机械富集过程中不再向下远移。
The gold enrichments studied were found in lateritic coverings in the state of Mato Grosso, Brazil, covering the Precambrian Cuiaba schist. These laterites can be divided into five layers from bottom to top: (1) gray-blue alluvial rocks; (2) red muddy altered sand minerals; (3) Ferric hydroxide gravel and quartz debris layer; (4) iron shell; (5) modern soil. It was found that the gold content of the third layer immediately below the iron hull made the most sense. Based on geological studies and observations of gold particle morphology, the gold mine currently mined is believed to be the result of a combination of both the alteration of iron and aluminum and the red muddy alteration of quartz veins present in schist The combination of sand and mineral layers, the altered sand mineral layer plays a role in impermeable structure, so that the large gold particles in the process of enrichment will not move far down.