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

被引:0
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作者
ZHAI QingGuo1
2 College of Earth Sciences
机构
基金
中国国家自然科学基金;
关键词
Northern Tibet; Qiangtang; mafic dyke swarm; SHRIMP dating; Hfisotope;
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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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