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新疆东准噶尔铜华岭中酸性侵入体锆石U-Pb年代学研究
Zircon U-Pb Age of Tonghualing Intermediate-Acid Intrusive Rocks,Eastern Junggar,Xinjiang
【摘要】 伊吾县铜华岭中酸性侵入体位于新疆北部东准噶尔阿尔曼太断裂和克拉麦里断裂之间的野马泉岛弧区,岩性主要为闪长玢岩、英云闪长岩和二长花岗岩等。通过锆石LA-ICP-MS U-Pb年代学方法,对这3种岩性进行精确定年,其206Pb/238U的加权平均年龄分别为427.4±3.2,422.8±3.2和418.5±2.6 Ma,说明铜华岭岩体是早古生代岩浆活动的产物,为东准噶尔早古生代造山带演化提供了花岗岩证据。
【Abstract】 Tonghualing intermediate-acid intrusive rocks is located in Yemaquan arc between Armantai fault and Kelameili fault,Eastern Junggar,North Xinjiang.The intermediate-acid intrusive rocks are principally composed of diorite-porphyry,tonalite and monzogranite.Zircons from these rocks are dated using LA-ICP-MS U-Pb method and yield weighted mean 206Pb/238U age of 427.4±3.2,422.8±3.2 and 418.5±2.6 Ma respectively,indicating that there are Early Paleozoic magmatic activities in Eastern Junggar.This work supplies evidence for orogenic evolution in Early Paleozoic in this area.
【Key words】 Eastern Junggar; Tonghualing intermediate-acid intrusive rocks; zircon; U-Pb chronology;
- 【文献出处】 北京大学学报(自然科学版) ,Acta Scientiarum Naturalium Universitatis Pekinensis , 编辑部邮箱 ,2009年05期
- 【分类号】P597.3
- 【被引频次】55
- 【下载频次】345