广东嵩溪银(锑)矿床地质特征及成因类型

GEOLOGY AND GENESIS OF SONGXI SILVER(ANTIMONY) DEPOSIT,GUANGDONG PROVINCE

嵩溪银（锑）矿床形成于下侏罗统金鸡组，呈脉状穿层产出，具脉状、角砾状构造，矿石含大量硫盐矿物。成矿物质在剖面上具分带现象，上部富Sb、As；中部富Ag、Au、Pb、Zn；下部富Mo、Cu。包裹体均一温度介于130～340℃之间。围岩蚀变包括硅化、黄铁矿化、碳酸盐化、绢云母化及青磐岩化。硫、氧同位素和成矿年龄显示，成矿作用与下部早白垩世石英斑岩有关，嵩溪银（锑）矿床为与陆相次火山岩有关的浅成低温热液矿床。

Songxi silver （antimony） deposit occurs in the low Jurassic Jingji group Orebodies are strictly controlled by faults and fractures, and mostly take the forms of veins and stockworks. Ores show vein, stockwork and breccia structures. There are a large of sulfosalt minerals in the ores. Epithermal ore elements such as Ag, As and Sb are the. important character of Songxi Ag （Sb） deposit. Zoning of ore elements shows that the top of profile are rich in Sb and As, the middle part are rich in Ag,Au,Pb,Zn, and the lower part are rich in Mo and Cu. The formation temperature varies from 130℃ to 340℃. Wallrock alternations include silication, seritization, pyritization and carbonation. S,O isotope and age dating show mineralization is related to the early Cretaceous quartz porphyry. Songxi Ag （Sb） deposit is of the epithermal type associated with continental subvolcanism.