西南天山萨瓦亚尔顿金矿地质特征及矿床成因

METALLOGENIC CHARACTERISTICS AND ORIGIN OF SAWAYARDUN GOLD DEPOSIT,SOUTHWESTERN TIANSHAN MOUNTAIN

萨瓦亚尔顿金矿床赋存于中—上石炭统含碳碎屑岩建造中,矿化受构造破碎带的控制,矿石矿物为黄铁矿、毒砂、黄铜矿等硫化物,脉石矿物为石英和方解石,金矿物以银金矿为主。通过同位素研究表明成矿物质主要来自深部较老的地层,氢、氧、碳同位素特征显示,成矿作用主要为大气降水补给的地下水渗入深部,经加热循环并溶滤围岩中的矿质,迁移到低压空间和有利岩性层中而成矿。K-Ar同位素表明其成矿时代属燕山中—晚期,甚至更新,萨瓦亚尔顿金矿床属于穆龙套型金矿床。

The Sawayardun gold deposit occurs in the middle-upper Carboniferous turbidite sequence, and the mineralization is restricted by the fracture zones. The ore is composed of sulfide such as pyrite, arsenopyrite, and chalcopyrite and so on ; the matrix mineral composed of quartz and calcite. The gold is found mainly in electrura. The isotopic elements show that the mineral substance is coming from the old deep strata. It could formulated a model of circulating atmospheric water becoming a hydrothermal fluid at depth, dissolving gold metals from the country rocks, and nfigrating to a place with lower pressure and precipitated into stratum good deposit. The mineralization date is the middle-upper Yanshan epoch or later, using K-Ar method. The Sawayardun deposit is a Muruntar-type gold deposit.