东昆仑埃坑德勒斯特铜钼矿床中细粒花岗岩地球化学、锆石U-Pb年代学特征及其地质意义OA

Indosinian is one of the important tectonic evolution and magmatic activity period of the East Kun-lun orogenic belt,thus,the intrusive rocks of this period are critical to discuss the relationship between the tec-tonic evolution and the polymetallic mineralization of the East Kunlun orogenic belt.There is close relationship between the medium-fine grained granite and copper&molybdenum mineralization in Aikengdelesite Cu-Mo ore district from subduction-accretionary complex belt in southern slope of the East Kunlun orogenic belt.An comprehensive study of the geochemical characteristics,zircon U-Pb age,magma source and diagenetic tectonic environment were carried out for the medium-fine grained granite in Aikengdelesite Cu-Mo ore district,aiming to provide new evidence for the Late Paleozoic to Early Mesozoic tectonic evolution and polymetallic mineral-ization of the East Kunlun.The studied medium-fine grained granite is calc-alkaline series rock,with high SiO2(72.43%to 73.83%),high Al2O3(13.10%to 13.60%)and weakly negative Eu anomaly,and is relatively en-riched in LREE,Rb,Ba,Th,U and K,but relatively depleted in HREE,Nb,Ta,Ti,Sr and P.LA-ICP-MS zir-con U-Pb analysis of the medium-fine grained granite yielded an Late Permian age of(253.7±1.9)Ma.The medium-fine grained granite was formed in a continental arc environment of active continental margin and relat-ed to the partial melting of lower crust.