有机质在微细浸染型金矿化中的作用——以黔桂地区为例

The Role of Organic Matter in Micro-Disseminated Glod Mineralization in Qiangui Area

黔桂地区微细浸染型金矿主要产于碳酸盐岩—碎屑岩混合沉积层序中,溶矿岩石以泥质岩、粉砂岩和碳酸盐岩为主,富含有机质。矿石中有沥青分布,含金石英中存在有机质裹体。碳质含金量较高,可达53.60×10^(-6),在黄铁矿型矿石中,碳质含量与金的富集具有同步消长的正相关关系,有机质与金矿化关系密切。有机质中对金的迁移和富集起主要作用的是Au(CN)_2^-,Au(CN)_1^-,Au(HS_2)^-等化合物,含金有机络合物在岩石的孔隙或裂隙中运移沉淀。

The micro-disseminated gold deposit in Qiangui Area occur in the sedimentary sequence of carbonate and clastic rocks. The host rocks are mainly composed of mudstone .silt-stone and carbonate rocks. They are rich in organic matter. There are asphalt scattering in ore. Gold-bearing quartz exists inclustion of organic matter. Gold contents of carbonaceous materials reach highly to 53. 60*10^(-6). In pyrite type ore,contents of carbonaceous materials vary just the same as those of gold . Gold mineralization is associated with organic matter. It was compoumd Au(CN)2,Au(CN)4 ,Au(HS2) etc,in organic matter, that acted mainly on gold migration and concentration. Gold-bearing organic complex compound migrated and deposited in hole and rack of rocks.