青海省卡而却卡斑岩型铜矿地质特征及找矿意义

Geologic Characteristics of the Kaerqueka Porphyry Copper Deposit in Qinghai Province and Its Prospecting Significance

卡而却卡铜多金属矿床是近年在东昆仑成矿带西段发现的大型铜多金属矿床,前期在以矽卡岩型找矿的过程中,发现了斑岩矿化信息,近年来,斑岩成矿的事实渐趋清晰,通过对晚三叠世斑岩体的分布及深部断面的剖析,显示斑岩体为一复式小岩株。含矿的花岗闪长斑岩及相关的石英闪长岩岩石化学及地球化学特征具有埃达克质岩的特点,表明成矿构造环境与东昆仑中—晚三叠世底侵岩浆作用有关,具有较好的找矿前景,为东昆仑成矿带寻找斑岩型矿床指明了方向。

Kaerqueka copper-polymetallic deposit is one of the large copper-polymetallic deposits, it was found in the western part of the East Kunlun metallogenic belts in recent years. Early during the skarn- type ore prospecting, it was discovered porphyry mineralization information, and in the recent years, por- phyry mineralization is becoming clear. Through the analysis of distribution and deep cross-section of the Late Triassic porphyry, it displayed that the porphyry body is a duplex of little rock strain. The petro- chemical and geochemical characteristics of the granodiorite porphyry and associated quartz diorite has been common with that of adakitic rocks, indicating that the mineralization tectonic environment is related to the eastern Kunlun Mountains-Late Triassic magmatic underplating, and has good prospects for explora- tion, expanding the direction of prospecting of the ore belt in East Kunlun.