Earth Science Frontiers ›› 2023, Vol. 30 ›› Issue (2): 259-271.DOI: 10.13745/j.esf.sf.2022.2.58

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Emplacement and episodic denudation of basement granites from the southern Jiergalangtu Sag, Erlian Basin and its tectonic implications

GUO Zhixin1,2,3(), YANG Yongtai4,*(), REN Yi1, WANG Zhengqing1,2,5, FENG Zhigang1,2,3, CHEN Liang1,2,3, TANG Zhenping1,2,3   

  1. 1. School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China
    2. Hunan Key Laboratory of Rare Metal Minerals Exploitation and Geological Disposal of Wastes, Hengyang 421001, China
    3. Hengyang Key Laboratory of Geological Theory and Technology for the Nuclear Fuel Cycle, Hengyang 421001, China
    4. CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
    5. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China
  • Received:2021-06-16 Revised:2022-01-16 Online:2023-03-25 Published:2023-01-05
  • Contact: YANG Yongtai

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Abstract:

The Erlian Basin is one of the most important oil, gas, coal, and uranium-bearing basins in northern China, and basement granites of the Erlian Basin are gaining importance as uranium source and petroleum reservoir. However, the emplacement time and denudation history of the basement granites are poorly studied. Here, based on newly obtained zircon U-Pb geochronological data and zircon/apatite fission track evidence, the diagenetic age and uplift history of basement granites of the southern Jiergalangtu Sag, Erlian Basin are analyzed. The diagenetic age is constrained to the Early Jurassic (ca. 175 Ma), and two cooling events are recognized. The two cooling events are refined to the Late Jurassic (ca. 154 Ma and ca. 146 Ma) and late Early Cretaceous (ca. 114 Ma), respectively, and considered to be related to the contractional deformation in the Erlian Basin. The present study tentatively attributes the formation of basement granites to the southward subduction of the Mongol-Okhotsk Ocean Block, Late Jurassic cooling to the closure of the eastern Mongol-Okhotsk Ocean, and late Early Cretaceous cooling to the collision of micro-block with East Asia.

Key words: Erlian Basin, Jiergalangtu Sag, basement granite, U-Pb age, fission track

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