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中文摘要：
维宝铜铅锌多金属矿床位于青海与新疆两省区交界处的若羌县境内,是近年来在新疆祁漫塔格地区新发现的具有大型远景规模的多金属矿床,本文对该矿床西北部含暗色包体花岗闪长岩开展了SIMS高精度锆石U-Pb定年和地球化学研究,结果表明该花岗闪长岩含有角闪石特征矿物,SiO2含量为60.74%~61.34%,K2O含量为3.01%~3.20%,A/CNK值为0.89~0.94,属于准铝质高钾钙碱性I型花岗岩;在球粒陨石标准化的稀土元素配分图上表现为右倾式,轻重稀土分馏明显,具有中等负Eu异常（δEu=0.56~0.59）,微量元素以富集大离子亲石元素Rb、K和Th,明显亏损Ba、Ta、Nb、Ti等为特征。SIMS锆石U-Pb定年结果显示,花岗闪长岩结晶年龄为227.6±2.3 Ma（n=16,MSWD=0.02）,形成于晚三叠世,是东昆仑祁漫塔格地区中—晚三叠世大规模中酸性岩浆侵入作用的产物。借助元素判别图解,结合矿床地质特征和区域构造演化特点,认为维宝矿区西北部花岗闪长岩形成的构造环境为后碰撞演化阶段,很可能是与深部壳幔混染有关的变火成岩部分熔融的产物。
英文摘要：
Weibao CuPbZn-polymetallic deposit is located in Ruoqiang country of Xinjiang Autonomous Region,which is close to Qinghai Province.The deposit is a recently discovered potential-large scale polymetallic deposit in Xinjiang Qimantage.In this paper,one granodiorite sample（WB17）containing the mafic microgranular enclave from the pluton in the northwest of Weibao deposit and three granodiorite samples（WB17,WB18,WB19）from different positions in the same pluton were collected and used for petrographic observations as well as geochronological and geochemical studies.The pluton contains amphibole,and its A/CNK is in the range of 0.89-0.94,with SiO2 and K2O content ranging form 60.74%~61.34%,3.01%~3.20%,respectively.Thus this pluton is metaluminous and high-K calc-alkaline I-type granite.In addition,this pluton is characterized by enrichment of LILEs（Rb,Th,K）and depletion of Ba,Ta,Nb,Ti,with the chondrite-normalized REE patterns of right-dipping type and moderate negative anomalies of Eu（δEu=0.56-0.59）.SIMP zircon U-Pb dating of the granodiorite yields concordant an age of 227.6±2.3 Ma（n=16,MSWD=0.02）,which implies the granodiorite emplaced in Late Triassic.The data obtained by the authors and previously published show that the granodiorite is the result of the large-scale intermediate-acid magma emplacement from Middle Triassic to Late Triassic in the Qimantage,East Kunlun.Based on tectonic history and the structure environment discrimination,the granodiorite was inferred to be formed in a post-collisional tectonic setting and was probably the product of partial melting from the metaigneous rocks,which may be triggered by mantle-crust interaction.
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