摘要
湖北省蛇屋山金矿床原生矿石可分两种自然类型,即碎裂灰岩型和含砾粉砂质粘土岩型。据组合大样分析两种类型的矿物组合比较简单,金属矿物以黄铁矿、白铁矿为主,非金属矿物以水云母、高岭石、方解石、石英为主,化学成分以富含低温热液元素Ba、Sr、Hg、As、Sb为特征。两种类型中金的含量分别为0.89×10^(-6)和2.06×10^(-6),金的平衡系数分别达97.73％和82.62％。金主要赋存于粘土矿物和黄铁矿中,金在粘土矿物中呈次显微不规则状或小圆球状自然金和银金矿被吸附在高岭石和水云母的晶体边缘,金在黄铁矿中呈晶格金存在。
The primary ores from Shewushan gold deposit, Hubei Province may be divided into two natural types of cataclastic limestone and gravel-bearing silty clay rock, of which their min-eral assemblages are not comparatively complicated based on the analyses of composite Sam-ples from both the two types. Dominant metallic minerals are the pyrite and marcasite; and non-metallic minetals, hydromica, kaolinite, calcite and quartz; their chemical compositions are characterized by such abundant epithermal elemlnts as Ba, Sr, Hg, As, Sb, etc. The gold content is 0.89μg/g in the cataclastic limestone type and 2.06μg/g, in the gravel-bearing silty clay rock type; the gold equilibrium partitioning coefficient is 97.73% in the former, and 82.62%, in the latter. The gold dominantly occurs within the clay mineral and pyrite. The gold presents its occurrence in submicro, irregular or small spherulitic native gold and electrum adsorbed at the crystal rims of the kaolinite and hydromica within the clay mineral; and in crystal lattice gold, within the pyrite.
