Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (6): 1565-1577.doi: 10.13278/j.cnki.jjuese.20180213

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Age and Geological Significance of Ore-Bearing Strata of Tebai Gold Deposit in Alxa Right Banner Area

Cheng Xianyu1, Li Yike2, Dong Manhua3, Cao Kan3   

  1. 1. Tianjin Center, China Geological Survey, Tianjin 300170, China;
    2. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;
    3. Inner Mongolia Geology Limited Company, Huhehaote 010010, China
  • Received:2018-08-16 Published:2019-11-30
  • Supported by:
    Supported by Geological Survey Project of China Geological Survey(12120114077201,1212011220870,DD20160039,DD20190828)

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Abstract: In this research, the detrital zircon LA-ICP-MS U-Pb from the ore-hosting strata of gold deposits is studied in Alxa Tebai area. The concordant age of the youngest detrital zircons is concentrated in 525-461 Ma with the peak age of (473±3) Ma. The maximum sedimentary age of this set of strata is around the Middle Ordovician. Considering the Carboniferous Bembatu Formation, combined with the regional fault contacts and the massive emplaced Early Permian granites, the age of ore-bearing strata is roughly limited to the Middle Ordovician-Early Permian, rather than the Mesoproterozoic-Neoproterozoic as thought by predecessors. The source analysis shows that these Paleoproterozoic-Ordovician clastic zircons are most likely derived from the metamorphic basement of the Alxa massif and the magmatic arc of the syn-orogenic continental margin. The ore-bearing strata may have been formed in the background of the early subduction of Ordovician fore-arc basins, which is closely related to the Central Asian orogenic event.

Key words: Alxa block, Tebai gold deposit, ore-hosting strata, detrital zircon, U-Pb age

CLC Number: 

  • P536
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