东昆仑喀雅克登锌多金属矿床成因探讨

Discussion on genesis of Kayakedeng zinc polymetallic deposit in the eastern Kunlun mountain area

喀雅克登锌多金属矿床位于东昆仑成矿带西段,矿种以锌矿为主,同时伴生有钨、铜、铅、铁等矿种。出露地层主要为古元古界金水口岩群,侵入岩主要为早泥盆世的二长花岗岩、花岗闪长岩、晚三叠世花岗闪长岩与早侏罗世的钾长花岗岩,构造以北西西向的压扭性断裂构造为主。通过对矿床地质特征、矿石矿物结构构造以及控矿因素的分析,探讨了矿床成因,认为该矿床在近矿围岩形成夕卡岩型为主的锌、钨多金属矿体,并受岩体与围岩接触带产状控制,在远端形成热液型锌多金属矿体,受破碎蚀变带控制明显,具有夕卡岩型—热液型系列成矿的特征,提出今后的找矿工作可在接触带远端的破碎蚀变带中寻找热液型矿体的新思路。

The kayakedeng zinc polymetallic deposit is located in the eastern Kunlun mountain area, the main ore mineral is Zn metal associated with W, Cu, Pb and Fe metals. The main outcropped strata is marble of Early Proterozoic Jinshuikou group, main intrusive rocks are early Devonian monzonitic granite and granodiorite, late Triassic granodiorite and early Jurassic feldspar granite, main structure dominated by NWW-trending compresive shear faults. Based on integrated study of geological characteristics, textures and structures of ore minerals and ore-controlling factors, the ore deposit genesis is discussed in the article. It is concluded the deposit mainly is skarn type Zn - W polymetallic deposit which was formed in nearby the country rock, and controlled by the intrusive rock and contact zone, and hydrothermal type zinc polymetallic ore body formed in the distal place from the contact zone which was controlled by the fractured alteration zone.Therefore the deposit has the characteristics of the skarn type and hydrothermal type deposit, and finally it is pointed out that there is great potential for prospecting hydrothermal type ore bodies in the fractured zone in the distal place.