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Metamorphic Tectonite Types and Their Characteristics

LIU Zheng-hong, XU Zhong-yuan, YANG Zhen-sheng, CHEN Xiao-feng   

  1. College of Earth Sciences, Jilin University, Changchun 130061, China
  • Received:2006-04-12 Revised:1900-01-01 Online:2007-01-26 Published:2007-01-26
  • Contact: LIU Zheng-hong

Abstract: Metamorphic tectonite is a special rock formed by deformation in ductile shear belts at different crustal levels, which has a clear meaning of structural origin. According to deformation mechanism, sytectonic paragenetic association of minerals and deformation environment, metamorphic tectonites are divided into tectonic gneiss series, tectonic schists series and mylonitic series. The tectonic gneiss, developed at deep crustaltectonic levels by grain flow and diffusion creep mechanism, have stripe and band fabrics in macroscopic, and three edges equilibrium texture in microscopic scales. Tectonic schists are formed by dislocation and new mineralization at the middle-high level of the crust, and consist of the syntectonic new minerals and matrix. Mylonitic series consists of porphyroclasts and matrix formed by dislocation creep and dynamic recrystallization, and has fine grained texture and S-L fabrics.

Key words: tectonite, type, deformation mechanism

CLC Number: 

  • P588.33
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