摘要
本文对库喀阿孜铅-锌-（铜-钨）多金属矿床中距矿体不远处出露的二长岩、花岗闪长岩岩体进行了地球化学研究，以便于了解该多金属矿床的形成背景。研究表明，这些侵入岩主要为一套准铝质、钙碱性系列中一酸性岩石，具有较低的铝饱和指数（A／CNK-0．91～1．05），明显富集LILE和具有低的HFSE／LILE比值，具有弱到中等的负铕异常（8Eu-0．53～0．97）；二长岩岩体LA-ICP-MS锆石U_Pb年龄为461．5±3．3Ma。初步认为，这些中酸性岩体为加里东期中期侵位的I型陆缘弧花岗质岩石，与矿区内铅-锌-（铜-钨）多金属矿化无明显关系。
In order to understand the ore-forming background of the Kukaazi Pb-Zn-（Cu-W） polymetallic deposit in the west Kunlun area, a primary geochemical study had been performed on the intrusive monzonite and granodiorite rocks near the polymetallic deposit. It is shown that they are metaluminous calc-alkaline granotoids, with relative low A/CNK values （0.91~1.05）, obviously enriched in LILE, low HFSE/LILE ratio, weak to medium Eu nega- tive anomalies （~Eu values vary from 0.53 to 0.97）. The LA-ICP-MS zircon U-Pb dating of the monzonite is 461.5 -I-3.3 Ma. Therefore, we believed that these intermediate-acidic intrusives, which emplaced in the middle Caledo- nian period, belong to I-type continental marginal arc granitoids, and have no obvious relationship with Pb-Zn-（Cu- W） mineralization.
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2013年第6期736-745,共10页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家自然科学基金资助项目(41272114)
新疆临钢资源投资股份有限公司研究基金
