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地球与行星物理

ISSN  2096-3955

CN  10-1502/P

Citation: ZiQi Ma, Gang Lu, JianFeng Yang, Liang Zhao, 2022: Numerical modeling of metamorphic core complex formation: Implications for the destruction of the North China Craton, Earth and Planetary Physics. http://doi.org/10.26464/epp2022016

doi: 10.26464/epp2022016

Numerical modeling of metamorphic core complex formation: Implications for the destruction of the North China Craton

1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;

2. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: Gang Lu,

Fund Project: The code MILAMIN_VEP was developed by professor Boris Kaus at the University of Mainz, Germany. We thank Dr. Wei Leng (Editor) and two anonymous reviewers for their constructive comments that significantly improved the manuscript. We also acknowledge helpful discussions with Dr. Kun Wang, Zimu Wu and the computing time granted on Wukong. This research is supported by the National Natural Science Foundation of China (Grant No. 41774112).

Widespread magmatism, metamorphic core complexes (MCCs), and significant lithospheric thinning occurred during the Mesozoic in the North China Craton (NCC). It has been suggested that the coeval exhumation of MCCs with uniform NW-SE shear senses and magmatism probably result from the decratonization event during the paleo-Pacific Plate retreat. Here we use 2-D finite element thermo-mechanical numerical models to investigate critical parameters controlling the formation of MCCs under far-field extensional stress. We observe three end-member deformation modes: MCC mode, symmetric-dome mode, and pure-shear mode. The MCC mode requires Moho temperature ≥ 700 °C and extensional strain rate ≥ 5×10-16 s-1, implying that the lithosphere had already been thinned when the MCC was formed in the Mesozoic. Combining with the widespread MCCs with the same NW-SE extension direction in the NCC, we suggest that MCCs are surface expressions of both large-scale extension and craton destruction and that rollback of the paleo-Pacific slab might be the common driving force.

Key words: metamorphic core complex, North China Craton, numerical modeling, extension
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Numerical modeling of metamorphic core complex formation: Implications for the destruction of the North China Craton

ZiQi Ma, Gang Lu, JianFeng Yang, Liang Zhao