Zircon U-Pb dating of basement gneisses in the super-large Bayan Obo REE-Fe-Nb deposit,Inner Mongolia |
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Authors: | Kaiyi?Wang Email author" target="_blank">Hongrui?FanEmail author Yihan?Xie Huimin?Li |
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Institution: | (1) LTE, Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029 Beijing, China;(2) Tianjin Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences, 300170 Tianjin, China |
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Abstract: | Zircon U-Pb ages have been determined for basement gneisses in the Bayan Obo REE-Fe-Nb deposit. On the U-Pb concordia diagram data of three samples yield upper intercept ages of 1948-1917 Ma. Thus, these basement gneisses are of Paleoproterozoic. Rock association of these basement gneisses includes tonalite, syenite and paragneiss, not belonging to a sedimentary package. It is more appropriate to consider this association as a basement complex rather than a stratigraphic "Group". |
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Keywords: | basement complex zircon U-Pb age Bayan Obo |
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