含金硫化物矿床的表生富集型金矿

虎圩金矿位于湿热多雨的江西省东部，赋存在东乡火山岩盆地北部，江南地体与赣中地体的拼接带上，因此，矿区断裂构造发育，岩浆活动频繁。金矿化产于燕山中期侵入的花岗闪长玢岩的内外接触带上。矿化以充填交代张性断裂构造带的脉状形式产出。矿体为不规则脉状和透镜状，具明显的垂直分带现象。上部为氧化矿石、具黑色土状、蜂窝状构造，Ａｕ含量达工业品位以上，形成金矿体、此外，氧化矿石还富Ｃｏ，相对贫Ｃｕ、Ｚｎ、Ａｇ和Ｐｂ

SUPERGENE ENRICHMENT-TYPE AU-BEARING SULFIDE DEPOSITS

The Huxu gold deposit, which is located in the eastern part of Jiangxi Province, occurs in the north of the Dongxiang volcanic basin and the jointing zone between the Jiangnan terrain and the Gangzhong terrain. Thereby, fault structures are well developed and magmatic activity frequently occurred. Gold mineralization occurs in the endo-and exo-contact zones of the Middle-Yenshanian granodiorite. The mineralization occurs as veins filling and metasomatizing tensile fractures. The orebodies occur as irregular veins and lenses. The oxidized ores exhibit black earthy and honeycombed structures. Their Au contents are so high as to be of industrial value. In addition, the oxidized ores are rich in Co and poor in Cu, Zn, Ag, and Pb, Pb-Zn sulfide ores exhibitmassive and impregnated structures. Au (<0. 5g/t), Cu, Ag and Gd, except for Pb and Zn, are at commercial importance.Affter exposure of the Au-bearing Pb-Zn sulfides, Pb-Zn sulfides would be converted to sulfates under the action of meteoric water. The residual Au was enriched to form the supergene enrichment-type gold deposits.