Precise columbite-(Fe) and zircon U-Pb dating of the Nanping No. 31 pegmatite vein in northeastern Cathaysia Block,SE China |
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| Institution: | 1. Key Laboratory for High Temperature and High Pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. State Key Laboratory of Ore Deposit Geochemistry Chinese Academy of Sciences, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. College of Earth Science and Resources, Chang’an University, Xi’an 710054, China;1. School of Earth Sciences, Zhejiang University, Hangzhou 310027, China;2. State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China;3. Institute of Mineral Resource, Chinese Academy of Geological Science, Beijing 100037, China;4. Laboratoire de Minéralogie, B18, Université de Liège, B-4000 Liège, Belgium;1. Key Laboratory of High-temperature and High-pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, 550002, PR China;2. School of Earth Sciences and Gansu Key Laboratory of Mineral Resources in Western China, Lanzhou University, Lanzhou 730000, PR China;3. University of Chinese Academy of Sciences, Beijing 100049, PR China;4. Exploration Institute of Geology and Mineral Resources of Ningxia, Ningxia 750021, PR China;1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;2. Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;3. No. 5 Team of Gold Exploration Branch of Chinese Armed Police Force, Xi''an 710100, China |
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| Abstract: | The Nanping pegmatite deposit is a large Ta-Nb-Sn deposit in the northeastern Cathaysia Block, SE China. Columbite-group minerals from zone I in the Nanping No. 31 pegmatite vein belong to columbite-(Fe). The compositions and texture features of zircon grains from the same zone identify their magmatic origin. Columbite-(Fe) U-Pb age coincides well with the U-Pb age of zircon, and these age data constrain the absolute formation timing of this pegmatite vein to approximately 387 Ma. Zircon εHf(t) values from the Nanping No. 31 pegmatite range from ?13.81 to ?11.60 with the TDM2 model ages ranging from 2107 to 2246 Ma, implying that the Nanping pegmatite-forming melts are derived from Paleoproterozoic metasedimentary rocks. The differences in emplacement age and Hf isotopic features preclude the surrounding granites from being the parental granite of the pegmatite vein. |
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| Keywords: | Nanping pegmatite Columbite-(Fe) U-Pb dating Zircon Hf isotope |
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