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Geoscience ›› 2011, Vol. 25 ›› Issue (1): 22-30.

• Water Resource and Environment • Previous Articles     Next Articles

Deformational Process from Thick-skinned to Thin-skinned Thrust in Xuefeng Mountain, South China: Evidence from SangzhiAnhua Tectonic Section

 TANG  Shuang-Li1, YAN Dan-Ping1,2, HONG  Chang-Liang1, ZHANG  Wei-Chen1   

  1. 1.School of Earth Sciences and Resources，China University of Geosciences, Beijing100083，China；
    2.State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing100083，China
  • Online:2011-02-24 Published:2011-02-27

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Abstract:

Thick-skinned thrust separating from thin-skinned thrust by the Dayong fault in Xuefeng Mountain and area on its northwest, brings variable interpretations of Mesozoic tectonicprocess in South China, and thus the structural style and origin of the Dayong fault are the keys to well understand tectonics of Xuefeng Mountain. Field investigation, interpretation of the data of seismic section and magnetotelluric sounding along Sangzhi-Anhua tectonic section are applied in this paper.The results indicate that the thick-skinned thrust was produced by thrusting the Banxi Group over the Lower Paleozoic in Early Silurian to Middle Devonian. The re-activation of the thick-skinned thrust during Middle Triassic to Jurassic turned Dayong fault into a detachment fault along weak layer of Banxi Group with tiny dip angle towards southeast, which overprinted the old thick-skinned thrust in the meantime. This late deformation also resulted in a NW-ward overthrusting, fault-related chevron syncline and flat-ramp thrust fault, known as the thin-skinned thrust. Therefore, we conclude that the original thick-skinned thrust developed in Paleozoic era was overprinted, with a detachment fault in Xuefeng Mountain, by the NW-ward thrust in Mesozoic era which also produced the thin-skinned thrust on its northwest side.

Key words: Xuefeng Mountain, thick-skinned thrust, thin-skinned thrust, deformational process

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