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Tectonic implication of stockwork microbreccias

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Chinese Science Bulletin

Abstract

The stockwork microbreccia found in the Dabie and Helan Mountains bears no relation to either meteorite impact and cryptoexplosion, or fault displacement. It is controlled by tensional or transtensional fracture network in relatively hard felsic crystalline rocks, appearing as breccia with dark cryptocrystalline matrix. The kilometer-scale distribution and complicated relation to fracture system of the stockwork microbreccias, randomly distributed autochthonous fragments of host rock, ultracataclasis without notable displacement in the cryptocrystalline matrix, and a probable solid-state amorphization deformation mechanism all suggest that large-scale, high-energy and rapid brittle fracturing event might have occurred in the rocks at relatively deep crustal level in the areas.

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Authors and Affiliations

  1. Institute of Geology, China Earthquake Administration, 100029, Beijing, China

    Jiasheng Zhang & Xiongnan Huang

  2. Institute of Geomechanics, Chinese Academy of Geological Sciences, 100081, Beijing, China

    Jianmin Liu

Authors
  1. Jiasheng Zhang
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  2. Xiongnan Huang
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  3. Jianmin Liu
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Correspondence to Jiasheng Zhang.

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Zhang, J., Huang, X. & Liu, J. Tectonic implication of stockwork microbreccias. Chin.Sci.Bull. 50, 68–75 (2005). https://doi.org/10.1360/982004-37

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  • DOI: https://doi.org/10.1360/982004-37

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