SHRIMP U-Pb dating and Hfisotopic analyses of zircons from the mafic dyke swarms in central Qiangtang area,Northern Tibet

被引：0
|
作者：
ZHAI QingGuo1
2 College of Earth Sciences
机构：
来源：
Science Bulletin | 2009年 / 13期
基金：
中国国家自然科学基金;
关键词：
Northern Tibet; Qiangtang; mafic dyke swarm; SHRIMP dating; Hfisotope;
D O I：
暂无
中图分类号：
P597.3 [];
学科分类号：
070902 ;
摘要：
In the "Central Uplift" of Qiangtang,Northern Tibet,a large scale of mafic dyke swarms extended in E-W direction.Zircon SHRIMP U-Pb dating on two representative samples of diabase dyke yield weighted mean ages of 284 ± 3 Ma and 302 ± 4 Ma,respectively,suggesting they emplaced in the Late Carboniferous to Early Permian.Zircon 176Hf/177Hf ratios range from 0.282852 to 0.283041,with εHf(t) values of +12.1 to +12.2 and Hf modal(TDM) ages of ～440―460 Ma.These data indicate that these mafic dykes were mainly derived from the depleted mantle.In addition,geochemical data suggest that these mafic dyke swarms are ofintra-plate origin.Therefore,the mafic dyke swarms represent products during the extensional process associated with the opening of the Paleo-Tethys Ocean in the area.
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页码：2279 / 2285
页数：7
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