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 

机构地区：[1]Chinese Acad Sci, Guangzhou Inst Geochem, Canton 510640, Peoples R China

出　　处：《Chinese Science Bulletin》2000年第7期649-653,共5页

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.Granitic 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 ± 33)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 initial87Sr/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.

关 键 词：ZIRCON U-PB age GRANITIC GNEISS Duku HIGHWAY western Tianshan. 

分 类 号：P597[天文地球—地球化学]