秦岭微细浸染型层控锑—金矿床金赋存状态研究

对秦岭沉积岩为岩矿岩石的微细浸染型金矿中－高含量金样品的光学，背散射电子－二次离子和高分辨透射电镜图象分析表明，金与砷具有显微尺率的强相关性。矿床中Ａｕ／Ａｓ值是变化的，但在提供分析样品中金和砷是正相关的。

MODE OF OCCURRENCE OF SUBMICRO GOLD IN QINLING MICRO- DISSEMINATED STRATABOUND ANTIMONY-GOLD DEPOSITS

Optical, backscattered electron, secondary ion, and high-precision transmission electron microscope image analyses of samples containing moderate to high gold concentrations in sediment-hosted micro-disseminated gold deposits indicate that gold is strongly correlated with As on a microscopic scale. The ratio of Au/As varies in the deposits, but a positive correlation is present in any given sample. Both elements are present primarily as arsenian pyrite overgrowths and ar-senopyrite. The author has found that gold occurs usually in small chain balls of its natural form with a size of submicron-grade in arseno-bearing sulfides. The deposition may have been so rapid in these high-grade areas that submicro gold occurs in the arseno-sulfide structure as small native gold grains.