中国红色粘土型金矿成矿特征

中国的红色粘土型金矿是 90年代初发现并开始研究的 ,基本上产于南方特别是西南地区。由于特殊的地质构造条件和气候、地貌条件 ,该类型金矿与国外的红土型金矿存在明显的差异 :红色粘土型金矿剖面发育差 ,红土化程度低 ;对源岩依存度高 ;铁铝含量低、硅含量高 ;矿石处在富粘土矿物阶段 ,少见三水铝石 ,一般为伊利石和高岭石共存。金在红色粘土中以微细粒分散形式存在 ,且在红色粘土剖面中由于表生淋滤作用而发生活化、迁移和再沉淀。

CHARACTERS OF MINERALIZATION OF THE RED- CLAY-TYPE GOLD DEPOSITS IN CHINA

The red-clay-type gold deposits in China were discovered in the early 1990's in South China, especially in the southwest of China. The gold deposits are obviously different from laterite gold deposits abroad. The red-clay-type gold deposits depend on these rocks that provide gold. Iron and aluminum are low while silicon is high. Ore is in the phase of clay minerals in which gibbsite is less and kaolinite commonly coexists with illite. Gold occurs in the red-clay profile as micro-fine and dispersed particles. These gold particles are mobilized, transported and precipitated under leaching action.;