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《Chinese Geology》 2002-04
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Sm-Nd dating of the protolith of blueschist in the Shuanghu area,Tibet

LI Cai 1 ,LI Yong-tie 2 ,LIN Yuan-xian 3 ,WANG Tian-wu 1 ,YANG De-ming 1 ,HE Zhong-hua 1(1.College of Earth Sciences,Jilin University,Changchun130061, China2.Institute of Remote Sensing Geology,Institute of Petroleum Exploration &Development ,Beijing100083,China3.Tianjin Institute of Geology and M ineral Resources,Tianjin,300170China)  
The 40 Ar / 39 Ar age of crossite in blueschist in the Shuanghu area,Tibet,but the age of the pro-tolith of the blueschist is highly controversial.Previously most researchers think that the protolith is earlier than Devonian in age and some researchers even think it to be Meso-and Neoproterozoic in age and call it the Amugang Group.On the basis of 1∶100000mapping and measurements of the section,the authors collected relevant samples and obtained the Sm-Nd isoch ron ages of 272±7Ma,268±5.6Ma and252±4.6Ma for the protoli th of the blueschist.On that basis,combined with the regional geological con ditions and occurrence of blueschist in the Shuanghu area,it is believed that the age of the protolith of the blueschist is Permian,and the age of the Am ugang Group is assigned to Permian and the age of the Qiagelela ophio-lite is determined to be late Early Permian.The age dating provides important evidence for the evidence of the Paleo-Tethys in Lungmu Co-Shuanghu.
【Fund】: 原地矿部“九五”重大基础项目(9501101-05);; 中国石油天然气集团公司“九五”科技工程(QZ-97-204102)
【CateGory Index】: P597
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