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Volume 43 Issue 1
Jan.  2024
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Article Navigation >  Bulletin of Geological Science and Technology  > 2024  >  43(1): 63-73
CHEN Biao, JIA Xiaoqi, WEI Wei, JIN Hailong. Characteristics and geological significance of geochronologic results from the Bayan Obo deposit, Inner Mongolia[J]. Bulletin of Geological Science and Technology, 2024, 43(1): 63-73. doi: 10.19509/j.cnki.dzkq.tb20230255
Citation: CHEN Biao, JIA Xiaoqi, WEI Wei, JIN Hailong. Characteristics and geological significance of geochronologic results from the Bayan Obo deposit, Inner Mongolia[J]. Bulletin of Geological Science and Technology, 2024, 43(1): 63-73. doi: 10.19509/j.cnki.dzkq.tb20230255
shu

Characteristics and geological significance of geochronologic results from the Bayan Obo deposit, Inner Mongolia

doi: 10.19509/j.cnki.dzkq.tb20230255

  • National Key Laboratory of Baiyunobo Rare Earth Resource Research and Comprehensive Utilization, Baotou Research Institute of Rare Earths, Baotou Inner Mongolia 014030, China

More Information
  • Author Bio:

    CHEN Biao, E-mail: 2413375236@qq.com

  • Corresponding author: JIN Hailong, E-mail: 1609244818@qq.com
  • Received Date: 20 Jun 2022
  • Accepted Date: 30 Jul 2022
  • Rev Recd Date: 28 Jul 2022
    Abstract
  • Objective

    The Bayan Obo deposit in Inner Mongolia is a rare superlarge REE-Nb-Fe polymetallic deposit worldwide. There are still controversies on the timing of REE mineralization in the deposit due to the complex geological evolution in the region.

    Methods

    Based on previous isotopic dating results, in combination with geological characteristics of the deposit, this paper re-evaluates potentially multiple episodes of REE mineralization.

    Results

    The Bayan Obo deposit has experienced the Precambrian tectonic evolution of the North China Craton between 2.5-1.8 Ga. The major REE mineralization was formed in the Bayan Obo rift at ~1.3 Ga during the final stage of the breakup of the Columbia supercontinent, coeval with carbonate dike in the region. Hydrothermal metasomatism or overprints occurred throughout the Bayan Obo area, which is related to the late Paleo-Asian Ocean subduction-collision orogeny in the northern margin of the North China Craton, producing the late REE veins and recrystallization of original REE minerals. Such a hydrothermal modification event has variably disturbed the isotopic system of the H8 ore-bearing dolomite, resulting in multiple periods of isotopic ages (1.0-0.2 Ga) with peaks at 440 Ma and 270 Ma.

    Conclusion

    In summary, the Bayan Obo deposit primarily formed from the ~1.3 Ga rift metallogenic event, superposed by Caledonian and Hercynian tectonothermal events.

     

    • The authors declare that no competing interests exist.
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    SUN L, ZHANG L, ZHANG H D. Petrology, geochemistry and Pb isotope composition of Bayan Obo Group in Inner Mongolia: Constraints on the genesis of stratabound Haoyaoerhudong gold deposit[J]. Geological Science and Technology Information, 2018, 37(1): 7-15. (in Chinese with English abstract)
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