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

Zircon U-Pb dating of porphyroid monzonitic granite in the Kaerqueka copper polymetallic deposit of East Kunlun Mountains and its geological significance

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。

Abstract: 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 porphyroid monzonitic granite was formed in Late Triassic, during the Indosinian magmatic activity.