Zircon U-Pb age of granitic gneiss on Duku highway in western Tianshan of China and its geological implications

作     者：Yibing Chen Aiqin Hu Guoxin Zhang Qianfeng Zhang 

作者机构：Chinese Acad Sci Guangzhou Inst Geochem Canton 510640 Peoples R China 

出 版 物：《Chinese Science Bulletin》 (CHINESE SCIENCE BULLETIN)

年 卷 期：2000年第45卷第7期

页      面：649-653页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学] 

基　　金：中国科学院资助项目(49633250) 国家'305'科技攻关项目(96-915-07-05) 

主　　题：zircon U-Pb age granitic gneiss Duku highway western Tianshan. 

摘      要：Granitle gneiss on Duku highway in western Tianshan has been dated by the U-Pb zircon method. When plotted on the concordia diagram, the results give linear data array and the upper intercept age of (882±3)Ma, and the age was considered as the crystallization age of the protolith. Granitic gneiss has high ASI value (1.09), high LILE and LREE contents, significantly negative Eu depletion, distinctly negative Ba, Sr, P, Ti and Nb anomalies and indicate continental crust parentage, which is consistent with high initial 87Sr/86Sr ratios value (0.7170) and very negative εNd(t)=-14.1. The protolith magma is interpreted as a product of partial melting of the basement rocks of older basement crust.