甘肃省阳山金矿田金的赋存状态和金矿物特征

Modes of occurrence and characteristics of gold mineral from Yangshan gold field in Gansu

甘肃阳山金矿田属于类卡林型金矿床,金矿化类型主要有蚀变千枚岩、蚀变斜长花岗斑岩、蚀变砂岩、蚀变灰岩四种.金多呈独立金矿物形式出现,少许呈分散状,矿石中金矿物自然金为主,其次是银金矿.金矿物以包体金、裂隙金、粒间金等形式嵌布于毒砂、黄铁矿、辉锑矿、粘土矿物等主要载金矿物中,且毒砂、黄铁矿、辉锑矿较其他金属硫化物中占优势.金矿物形态各样,粒度以微细粒为主.金矿物特征反映出本区金矿床的成矿物质主要来源于变质岩、岩浆岩和地慢,成矿作用与印支晚期中酸性侵入岩有关.这与地质地球化学研究所获得的矿床成因认识相一致.

The Yangshan gold mine field in Gansu is the Carlin-like type,and the gold mineralization is pri- marily composed of altered phyllities,altered plagiogranite porphyries,altered sandstones,altered limestones. Au mostly appears in the form of independent mineral,and few is dispersed.Native golds is the main part in ore,and the silver-gold mines are minor.Gold minerals in the form of xenolith Au,fractured Au,intergranal Au are distributed over the gold-bearing minerals,arsenopyrites,pyrites,stibnites,clay mine...