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黔西南上二叠统底部大厂层内微细浸染状金矿矿石中的金主要呈胶体状粒子金产出,大部分赋存于粘土矿物中,少量赋存在黄铁矿、毒砂及炭屑内,矿层及矿石均有不少沉积成因标志。分析区域地质与矿产关系发现,金矿与大厂层中和峨眉山玄武岩同时喷发堆积的含 Au0.05—0.3g/t 火山灰物质有关。其成因机制是散落在黔桂海盆海面以上高地的火山灰风化后, 分解出的金元素经腐殖酸溶解,并被粘土矿物、金属硫化物等吸附化合富集,再经水力搬运分选再富集形成的沉积金矿。成因模式有别于常见的金矿类型,暂名“大厂式”金矿。
The gold in the finely disseminated gold ores in the bottom layer of the Upper Permian in the southwestern Guizhou Province was mainly colloidal gold particles, most of which were found in clay minerals with a small amount of pyrite, arsenopyrite and charcoal Within the mine, there are many deposits and ore deposition cause signs. Analysis of the relationship between the regional geology and mineral resources found that the gold deposits are related to the volcanic ash containing Au0.05-0.3 g / t emanating from the Emeishan basalts and the Emeishan basalts. The reason for this is that after the volcanic ash scattered over the sea surface above the sea level in the Guizhou-Guangxi Basin weathered, the decomposed gold elements are dissolved by humic acid and enriched by the adsorption and combination of clay minerals, metal sulfides and the like, Set the formation of gold deposits. Genesis mode is different from the common types of gold, tentative name “Dachang ” gold.