新疆巴伦台钾长花岗岩的地球化学及年代学  

The geochemical characteristics and chronology of the K-feldspar granite in Baluntai area,Xinjiang

作　　者：王守敬[1] 王居里[1] 

机构地区：[1]西北大学大陆动力学国家重点实验室/地质学系,陕西西安710069

出　　处：《西北大学学报（自然科学版）》2010年第1期105-110,共6页Journal of Northwest University（Natural Science Edition）

基　　金：国家科技攻关计划基金资助项目(2003BA612A-06-10-01);国家科技支撑计划基金资助项目(2006BAB07B04-05)

摘　　要：目的探究新疆中天山巴伦台地区钾长花岗岩的地球化学特征、成岩年龄及其地质意义。方法在详细的地质调查基础上,分析其主量、微量元素含量等地球化学特征,并利用锆石LA-ICP-MS U-Pb定年方法确定其成岩年龄。结果钾长花岗岩具有火山弧花岗岩特征,形成年龄为369.6 Ma±2.6 Ma。结论古生代南天山洋洋壳向伊犁—中天山微板块下的俯冲至少延续到晚泥盆世。Aim To study the geochemistry characteristics,zircon U-Pb chronology and the geological significance of the K-feldspar granite in northern Baluntai area.Methods Based on the geological investigation,geochemistry analysis and LA-ICP-MS zircon U-Pb dating about the K-feldspar granite,the geological significance of the K-feldspar granite has been studied.Results The K-feldspar granite has the characteristics of island-arc granites,and formed at 369.5 Ma±2.6 Ma.Conclusion The paleo-southern Tianshan ocean lithosphere had been subducting beneath the Yili-middle Tianshan block from Silurian to late Devonian.

关 键 词：钾长花岗岩 地球化学 锆石U-PB定年 巴伦台地区 中天山 

分 类 号：P588.121[天文地球—岩石学]