东昆仑卡而却卡铜多金属矿床似斑状二长花岗岩锆石U-Pb年龄及其地质意义

摘要

卡而却卡铜多金属矿床位于东昆仑成矿带西段,具有斑岩型-矽卡岩型-热液型系列成矿的特征,成矿元素以Cu、Mo、Pb、Zn为主,共生、伴生有Fe、Au、Ag、W、Sn.采用LA-ICP-MS同位素测定技术,测得与斑岩型成矿关系密切的似斑状二长花岗岩中锆石的206Pb/238U年龄为226.5±0.5Ma(MSWD=1.05,n=25),表明似斑状二长花岗岩形成于晚三叠世,属印支期岩浆活动的产物.%The Kaerqueka copper polymetallic deposit is located in the western part of the East Kunlun Mountains metallogenic belt, characterized by porphyritic-skarn-hydrothermal series, with the main metallogenic elements being Cu, Mo, Pb, Zn and associated elements being Fe, Au, Ag, W, Sn. The LA-ICP-MS zircon U-Pb chronological study of porphyroid monzonitic granite shows that the porphyroid monzonitic granite zircon 206Pb/238U age is 226.5±0.5Ma (n=25, MSWD=1.05), which suggests that the porphy-roid monzonitic granite was formed in Late Triassic, during the Indosinian magmatic activity.