文章摘要
高景刚.西天山可可萨拉铜铁钼多金属矿区石英闪长岩的地球化学、SHRIMP U-Pb年代学及形成环境[J].地质与勘探,2014,50(6):1007-1014
西天山可可萨拉铜铁钼多金属矿区石英闪长岩的地球化学、SHRIMP U-Pb年代学及形成环境
SHRIMP zircon U-Pb dating and geochemical characteristic of quartz diorite in the Kekesala Cu-Fe-Mo polymetallic deposit, West Tian Shan and its formation?environment
投稿时间：2014-06-15  修订日期：2014-09-12
DOI：
中文关键词: 石英闪长岩 SHRIMP U-Pb定年 地球化学 西天山 新疆
英文关键词: quartz diorite, Zircon SHRIMP U-Pb dating, geochemistry, West Tian Shan  Xinjiang
基金项目:中国地质调查局我国典型三稀金属矿床研究与靶区优选（12120113078200）和新疆北部晚古生代大规模岩浆作用与成矿耦合关系研究（1212011121092）资助
作者单位E-mail
高景刚 长安大学，西部矿产资源与地质工程教育部重点实验室，陕西西安；西安地质矿产研究所，陕西西安；中国地质大学地质过程与矿产资源国家重点实验室，地学院，北京；新疆维吾尔自治区地质矿产勘查开发局第七地质大队，新疆乌苏 jggao@chd.edu.cn 
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中文摘要:
      对西天山可可萨拉铜铁钼多金属矿区的石英闪长岩开展了岩石地球化学和定年工作。岩石地球化学特征表明，石英闪长岩体具有较高的SiO2 、Al（Al2O3=14.13％~15.10%）和碱总量，富Na贫K，属准铝-弱过铝质岩石。微量元素和稀土元素分析结果显示，本区岩体具有高的LREE/HREE和LILE/HFSE比值，以富集大离子亲石元素( K、Rb、Ba、Th), 而相对亏损高场强元素( Zr、Hf、Y、Yb)，与陆壳区（同碰撞花岗岩和后碰撞）花岗岩类似。石英闪长岩的锆石SHRIMP U-Pb测年结果表明，石英闪长岩的形成年龄为365.3±2.8Ma，MSWD=1.08，指示其形成于晚泥盆世。地球化学和铅同位素特征暗示形成岩体的岩浆是地壳部分熔融形成，并混有少量的幔源物质，具有混源花岗岩的特点。结合邻区岩浆岩的特征及其时代，石英闪长岩形成于碰撞构造事件，处于碰撞后期的隆升阶段。
英文摘要:
      We have conducted lithogeochemical study and dating of the quartz diorite in the Kekesala Cu-Fe-Mo polymetallic deposit, West Tian Shan. Geochemical data show that the quartz diorite is characterized by high SiO2, Al（Al2O3=14.13％~15.10%）and high alkali，rich potassium and poor sodium，and belongs to metaluminous-weakly peraluminous rock series. The analysis results of trace elements and rare earth elements indicate that the quartz diorite has high LREE/HREE and LILE/HFSE ratio, high contents of large ion lithophile elements such as K, Rb, Ba, and Th，and low contents of high field strong elements such as Zr, Hf, Y, and Yb， similar to crustal (syn-collision granites and post-collision granites) granitoids. The results of zircon SHRIMP U-Pb dating of the quartz diorite provides the age of quartz diorite as 365.3±2.8Ma，with the MSWD value 1.08, implying that it was formed in Late Devonian. The characteristics of geochemistry and lead isotope suggest that the granite has the characters of mixed crust-mantle granites and the magma was formed by the partial melting of crustal rocks with a little mantle-derived material mixed. Combined with the characteristics and times of the magmatite of adjacent areas, we infer that the formation of this quartz diorite was associated with tectonic collision events when the crust uplifted in this region.
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