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Geoscience ›› 2019, Vol. 33 ›› Issue (05): 919-936.DOI: 10.19657/j.geoscience.1000-8527.2019.05.01

• Structural Geology and Stratigraphy •     Next Articles

Late Mesozoic Paleotectonic Stress Fields Inferred from Fault-slip Data in Central and Western Yanshan Orogenic Belt: Implications for Destructive Geodynamics of North China Craton

GAO Jianweng1,2,3(), LIN Yi1, ZHANG Changhou1(), DING Zhaoyue1,4, HOU Liyu1, HUANG Yingzhu1   

  1. 1. School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083, China
    2. Institute of Geophysical and Geochemical Exploration, China Academy of Geological Sciences, Langfang, Hebei 065000, China
    3. Key Laboratory of Geochemical Exploration, Ministry of Land and Resources, Langfang, Hebei 065000, China
    4. Hebei Geological Engineering Exploration Institute,Baoding, Hebei 071051, China
  • Received:2018-05-21 Revised:2019-07-10 Online:2019-10-26 Published:2019-10-28
  • Contact: ZHANG Changhou

Abstract:

A dataset of 2,321 fault-slip data were collected from 116 sites in Late Mesozoic plutons in the central and western Yanshan orogenic belt. Paleostress field inversion was carried out via Tensor from these data. A five-generation sequence of paleostress fields has been established from the inversion results combined with regional tectonic deformation analysis. We found that: (1) Latest Jurassic-Earliest Cretaceous (148-127 Ma) compression with N-S-trending maximum principle stress (σ1) (D1); (2) Early Cretaceous (143-127 Ma) compression with NW-trending σ1 (D2); (3) Multidirectional extension with a nearly vertical σ1 (D3, ~120-110 Ma); (4) Compression with NE-trending σ1 (D4), and (5) Compression with E-trending σ1 (D5). D1 and D2 are interpreted as the far-field effects correlated with the closing of Mongol-Okhotsk Ocean and west-dipping subduction of paleo-Pacific plate, respectively. These two tectonic systems have major impact on the deformation of the Yanshan orogenic belt. D3 may have reflected the vertical compression derived from deep mantle activity. Tectonic events unambiguously related to D4 and D5 have not been reported so far, which implies relatively weak paleostress field, and their geodynamic setting remains unclear. We suggest that a model of multidirectional extension induced from vertical compression may be applicable to the peak destruction of the North China Craton, instead of a passive rifting model dominated by subduction roll-back of the paleo-Pacific plate as previously proposed.

Key words: fault-slip datum, paleostress field, Late Mesozoic, destruction of North China Craton, Yanshan orogenic belt

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