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The characteristics of HuaYuan-ZhangJiajie Fault belts and ESR dating of WuLing Mountain, in western HuNan

Xie Jianlei, Yang Kunguang, Ma Changqian   

  1. Faculty of Earth Science, China University of Geosciences, Wuhan 430074, China
  • Received:2006-03-20 Revised:2006-03-20 Online:2006-03-20 Published:2006-03-20

Abstract: As an important fault belt in the northwestern XueFeng uplift zone, the movement history of Huayuan-Zhangjiajie fault belt carries much information about the revolution of uplift zone. By a comprehensive research of macrostructure, microstructure, ESR (Electron Spin Resonance) dating and temperature measuring of fluid inclusion, a conclusion can be drawn that it underwent a comprehensive revolution process which includes several times of compression, extension and compression sliding. It is shown that the active intensity in the northern part was stronger than in the southern part. Since the Mesozoic era, the deformation was brittle in the shallow crust and accompanied with more than once low temperature hydrothermal activities. Temperature measuring of fluid inclusions indicates that homogeneous temperature mainly concentrated in three intervals of 120-150℃、180-200℃ and 270-330℃. The Quartz ESR (Electron Spin Resonance) dating of fault belts demonstrates that its intense movement occurred in the period of latest middle Yanshanian and late Yanshanian (86-131.8Ma). According to the field occurrence and character of the quartz veins, combining with published data, a conclusion was drawn that the transformation time from compression to extension took place between 131.3Ma and 120Ma in Mesozoic era, up to 110Ma or so, extension became intensive.