新疆阿尔泰山西北部喀拉斯岩体锆石U-Pb年龄及构造意义  

Zircon U-Pb Age and Tectonic Significance of Kalas Rock Body in Western Altay Mountain,Xinjiang

作　　者：加尔肯.吐尔得哈孜 德勒恰提.加娜塔依 赵同阳 韩琼 吾克依拉.吾铁朴 

机构地区：[1]新疆大学地质与矿业工程学院,新疆乌鲁木齐830046 [2]新疆维吾尔自治区地质调查院,新疆乌鲁木齐830000

出　　处：《新疆地质》2016年第3期338-344,共7页Xinjiang Geology

基　　金：新疆阿尔泰1:5万M45E021013等四幅区域地质矿产调查项目(12120114040701)资助

摘　　要：新疆阿尔泰山西北部喀拉斯岩体位于喀纳斯河以北,采用LA-ICP-MS锆石U-Pb法测得该岩体谐和年龄为(473.3±2.9)Ma(MSWD=0.36),表明该岩体侵入时代为早奥陶世。岩石地球化学特征显示岩体具高硅、富钠、高钾及铝过饱和特征,属高钾钙碱性高温型强过铝质花岗岩。微量元素Rb,Th,La等相对富集,Nb,Sr,Ti,Ba等亏损,LREE富集,HREE亏损,具较强的Eu负异常。综合前人研究成果认为:该岩体是典型的S型花岗岩,形成于活动大陆边缘的岛弧环境。Kalas rock,which is in the northwest of Xinjiang Altai,is located in the north of Kanas River, LA-ICP-MS zir- con U-Pb result indicate that the concordant age of rock is （473.3 ± 2.9） Ma（MSWD=0.36）,it represents that the intrusive time is Early Ordovicia.Geochemistry shows a high silica, sodium-rich,high potassium and aluminum over-saturation characteristics,belonging to high-K calc-alkaline high temperature SPGs.Trace elements show Rb,Th,La and other ele- ments are enriched,Nb,Sr, P, Ti, Ba and other elements loss,LREE enrichment, HREE loss, a strong negative Eu anoma- lies.Based on the previous research results,this paper suggests that Kalas rock is a typical S-type granites,and the rock formed in active continental margin arc environment.

关 键 词：喀拉斯岩体 强过铝质花岗岩 奥陶纪 锆石U-PB 

分 类 号：P597.3[天文地球—地球化学] P541[天文地球—地质学]