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The Characteristics and Genesis of Cleavage in Daqingshan Thrust

WU Xin-wei,LIU Zheng-hong,XU Zhong-yuan   

  1. College of Earth Sciences, Jilin University, Changchun 130061,China
  • Received:2004-11-23 Revised:1900-01-01 Online:2005-09-26 Published:2005-09-26
  • Contact: WU Xinwei

Abstract: A group of nonpenetrative cleavages developed in Daqingshan thrust. There are two different cleavages in the middle structural slice and in the outer structural zone. The first group of cleavage, being distributed at the footwall of main thrust and controlled by faults, behaves as a set of compressive planes whose occurrence, deformation characteristics and slipping direction are consistent with that of the main thrust . The second group belongs to interbeded cleavage controlled by lithology. Newlyformed syntectonic mineral assemblage along cleavage plane and clastic grain deformation characteristics indicates that the cleavages were formed at the low greenschist facies conditions in the middleupper crustal level and were featured by ductilebrittle deformation. Cleavages, being (121.6±1.6) Ma, has cut the Daqingshan folding. The stress field analysis showed that the cleavages formed under horizontal, S-N trending compressive stress.

Key words: thrust, cleavage, Mesozoic, tectonic deformation

CLC Number: 

  • P542.3
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