Earth Science Frontiers ›› 2020, Vol. 27 ›› Issue (4): 124-134.DOI: 10.13745/j.esf.sf.2020.6.41

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Phanerozoic multiple underplatings beneath the north margin of the North China Craton and the implications for tectono-magmatism and deep dynamics

SHAO Ji'an1(), ZHOU Xinhua2,3, ZHANG Lüqiao4   

  1. 1. The Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education; School of Earth and Space Sciences, Peking University, Beijing 100871, China
    2. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    3. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
    4. Geological Bureau of Inner Mongolia, Huhhot 010020, China
  • Received:2019-12-08 Revised:2020-06-15 Online:2020-07-25 Published:2020-07-25

Abstract:

Based on the study of underplating activities beneath the north margin of the North China Craton (NCC) in the Early Permian (P1), Late Triassic (T3), Early Jurassic (J1) and Early Cretaceous (K1), we demonstrated here that the reactivation of the NCC is caused by diapiric upwelling of deep lithospheric mantle. As revealed by comparative research, underplating in each stage shows difference and variation in its magma source depth, relationship to the tectonic framework, contribution to the vertical crustal accretion, and impulse upwelling of mantle magma, indicating a series of step by step continuous deep-seated thermal evolutionary processes and its dynamic mechanism is the deep high heat flux and upward migration of mantle materials. Mantle material upwelling must accompanied by a lithospheric structural change in mantle diapir uplift. Through discussion on the formation mechanism of the Mesozoic North China basin-range system, we suggest that the current upwelling characteristics of mantle diapirs, revealed by high resolution surface wave tomography in this area, could reflect the deep settings of the Mesozoic lithospheric intrusion.

Key words: north margin of the North China Craton, Phanerozoic, underplating, diapiric upwelling of mantle

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