4.1 Ga old detrital zircon in western Tibet of China

被引：9

作者：

DUO Ji1

2 Chengdu University of Technology

机构：

来源：

Chinese Science Bulletin | 2007年 / 01期

基金：

中国国家自然科学基金;

关键词：

SHRIMP U-Pb dating; detrital zircon; 4.1; Ga; China;

D O I：

暂无

中图分类号：

P597 [同位素地质学与地质年代学];

学科分类号：

070902 ;

摘要：

4.1 Ga old detrital zircon was found by SHRIMP U-Pb dating for quartz schist from Buring County in western Tibet, Southwest China. This is the oldest zircon U-Pb age found in China so far. The detrital zircon is a zircon of magmatic origin because its Th/ U ratios are 0.76 to 0.86. Two dates older than 4.0 Ga were measured only in one grain. U-Pb ages of 35 measured spots in 24 zircons can be subdivided into 6 groups, corresponding to at least 6 episodes of magmatic activity in the target area. The present results provide an important geochronological constraint on the geological evolution of Qinghai-Tibet Plateau.

引用

页码：23 / 26

页数：4