新疆塔县库尔尕斯金铜多金属矿床地质及地球化学特征

Geology and geochemistry of Kuergasi gold-copper polymetallic deposit in Taxkorgan county,Xinjiang

库尔尕斯金铜多金属矿床是在西昆仑库科西力克一带5万区调中发现最有价值的矿(床)点之一,该矿床赋存于岩体(S—Dδo)边缘接触带变质岩地层(O—S)中。该矿床矿种较多,伴生元素丰富,综合利用价值高,成矿地质条件好,找矿潜力巨大。通过对该矿床矿石、含矿岩系及围岩化学成分、微量元素、REE等特征系统地研究,初步认为金矿化与黄铁矿化、碳酸盐化等围岩蚀变关系密切,载金矿物主要为黄铁矿,赋矿岩石———角岩的形成和成矿具有一致性,小型构造对矿化富集作用明显。多金属矿成矿可能存在前后3个阶段:第一阶段以高温磁铁矿和铜矿形成为主;第二阶段为中温金矿的形成;第三阶段是低温铅锌矿的形成。

Kuergasi gold-copper polymetallic deposit is one of the most valuable mining points （deposits） in 1： 50 000 mineral survey of Kukexilike area, West Kunlun. This deposit Occurs in the metamorphic rock Formation （O -S） which is on the edge of contact zone with Rock mass （S -Dto）. This deposit has many minerals, rich associated elements, high utilization of value, good geological conditions and huge prospecting potential. Through systematic study about features of its ore, ore-bearing rocks and wall rock＇s chemical composition, trace elements and REE and so on, it is preliminarily believed that gold mineralization is closely related with wall rock alteration, Pyritization, Carbonation and so on, and gold-bearing minerals are mainly pyrites. Ore-bearing rocks-Hornfels＇formation and miner- alization of Au-Cu are consistent, and it is obvious that small construction promote mineralization enrichment effect. There may be three stages for Formation of Ore. The first stage is the formation of high-temperature magnetite and copper ore. The second stage is the formation of middle-temperature gold ore. The third is the formation of low tempera- ture lead-zinc mine.