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Volume 15 Issue 2
Jun 2004
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Changshan Wei, Guxian Lü, Yeming Zhang, Chengyun Xiong. Primary Deformation Analyses of High Pressure Metamorphic Rock in Western Dabie Mountain Area. Journal of Earth Science, 2004, 15(2): 220-223.
Citation: Changshan Wei, Guxian Lü, Yeming Zhang, Chengyun Xiong. Primary Deformation Analyses of High Pressure Metamorphic Rock in Western Dabie Mountain Area. Journal of Earth Science, 2004, 15(2): 220-223.

Primary Deformation Analyses of High Pressure Metamorphic Rock in Western Dabie Mountain Area

Funds:

the Major Science and Technology Development Program 2002201

the Ministry of Land and Resources, and the Key Basic Geological Project 90003

the formerMinistry of Geology andMineral Resources of China 

  • Received Date: 14 Jan 2004
  • Accepted Date: 08 Feb 2004
  • In the western Dabie Mountain area, the eclogites have similar compositions and tectonic environment, which could be contrastively researched. Except for the reservation of the early structural deformation inside and outside of the eclogite lens, there is no obvious difference between the characteristics of the foliation and lineation in the eclogite lens from the one in surrounding region. So this paper concludes that the eclogites or blueschists (high pressure metamorphic rocks, i. e. HPM) are basically situated in the original position. The eclogites are mostly superposed by the ductile shear zone and show the feature of structural displacement, but so far we have not discovered any large scale structural zone to uplift eclogite return. Based on the analyses of finite strain measure, petrofabric analysis and TEM image for some minerals such as quartz and garnet, we could efficiently know the deforming characteristics of the eclogite in the prophase and anaphase of the main deforming epoch, and finally determine the forming condition of eclogite according to the strain and the differential stress. This paper puts forward preliminary conclusion that some HPM rocks could be formed by the deep layer embedding and local stress concentration in the process of regional metamorphism.

     

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  • Hubei Bureau of Geology and Mineral Resources, 1995. The High and Ultrahigh Pressure Metamorphism and Their Tectonic Evolution in Wudang-Tongbai-Dabie Shan Area(in Chinese)
    Liu, X. C., Li, S. Z., Xie, H. M., et al., 2003. StructuralChronology Framework and the Evolution of the UHPM/HPM Belt in Hong'an Area, Hubei Province(in Chinese)
    Lü, G. X., Chen, J., Li, X. B., et al., 1999. The Formation Depth of Coesite Bearing Eclogite, Dabie UHPMZone, China, Modified by Tectonic-Original Additional Hydrostatic Pressure. Chinese Sci. Bull. , 44(5): 398- 412(in Chinese) doi: 10.1007/BF02977876
    Weathers, M. S., Bird, J. M., Cooper, R. F., et al., 1979. Differential Stress Determined from Deformation-Induced Microstructures of the Moine Thrust. J. Geophys. Res. , 84 (B13): 7495-7509 doi: 10.1029/JB084iB13p07495
    You, Z. D., Han, Y. J., Yang, W. R., et al., 1998. The High-Pressure and Ultra-high-Pressure Metamorphic Belt in the EastQinling and Dabie Mountains, China. China University of Geosciences Press, Wuhan. 31- 50(in Chinese)
    Zhou, G. Z., Liou, J. G., Liu, Y. J., 1996. High and Ultrahigh Pressure Metamorphic Rock in Northern Hubei Province. China University of Geosciences Press, Wuhan. 200- 242(in Chinese)
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