U-Pb Zircon Dating of the Yeniutan Granitic Intrusion in the Western Sector of the North Qilian Mountains

查看全文 作　　者：MAO [1]Jingwen;ZHANG [1]Zuoheng;JIAN [2]Ping;WANG [1]Zhiliang;YANG [1]Jianmin;ZHANG [2]Zhaochong

机构地区：[1]Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037;[2]Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037

出　　处：《Acta Geologica Sinica(English Edition)》索引2000年第74卷第4期,共5页

基　　金：a part of research results of a state key research project(No.G1999043200) 摘　　要：Zircons from granodiorite and biotite granite in the Yeniutan granitic intrusion in the western North Qilian Mountains yielded a weighted mean 206Pb/238U apparent age of 460±3 Ma, suggesting that the intrusion originated during the late stage of plate subduction. Its related Ta’ergou and Xiaoliugou deposits are two of the few large tungsten deposits formed in the plate subduction environment in the world. The U-Pb dating of the zircons from the biotite granite gave a discordant lower intercept age of 183±4 Ma, which implies that the Yanshanian event was probably superimposed on the North Qilian region. 关键词：U-Pb dating granodiorite biotite granite tungsten deposit North Qilian Mountains

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U-Pb Zircon Dating of the Yeniutan Granitic Intrusion in the Western Sector of the North Qilian Mountains

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