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| Cassiterite U-Pb Dating of Rare-metal Pegmatite in Guanpo area，North Qinling and its geological significance |
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Zeng Wei1,2,3, Zhou Hongying1,3, Sun Fengyue2, Wang Jiaying1,3, Bi Junhui1,3, Cui Yu Rong1,3, Chen Junqiang1,3
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1.Tianjin Center,China Geological Survey;2.College of Geosciences，Jilin University;3.North China Center of Geoscience Innovation
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