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Volume 21 Issue 5
Oct 2010
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Journal of Earth Science  > 2010  >  21(5): 532-540.
Shenghua Mei, Ayako M Suzuki, David L Kohlstedt, Lili Xu. Experimental Investigation of the Creep Behavior of Garnet at High Temperatures and Pressures. Journal of Earth Science, 2010, 21(5): 532-540. doi: 10.1007/s12583-010-0127-8
Citation: Shenghua Mei, Ayako M Suzuki, David L Kohlstedt, Lili Xu. Experimental Investigation of the Creep Behavior of Garnet at High Temperatures and Pressures. Journal of Earth Science, 2010, 21(5): 532-540. doi: 10.1007/s12583-010-0127-8
shu

Experimental Investigation of the Creep Behavior of Garnet at High Temperatures and Pressures

doi: 10.1007/s12583-010-0127-8
  • 1.

    Department of Geology and Geophysics, University of Minnesota, MN 55455, USA

  • 2.

    Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Funds:

the US Department of Energy, Office of Basic Energy Sciences DE-FG02-04ER15500

National Science Foundation NSF-EAR-0652852

More Information
  • Corresponding author: Shenghua Mei, meixx002@umn.edu
  • Received Date: 04 Jun 2010
  • Accepted Date: 20 Jul 2010
  • Publish Date: 01 Oct 2010
    Abstract
  • To provide constraints on the rheological properties of garnet, we have experimentally investigated the creep behavior of garnet at high pressures and temperatures using a deformation-DIA. Samples were cold-pressed from a garnet powder and deformed at constant displacement rates ranging from 1.1×10−5 to 2.6×10−5 s−1 at high temperatures (1 273–1 473 K) and high pressures (2.4–4.1 GPa). Differential stress and pressure were measured using X-ray diffraction techniques based on the elastic strain of various lattice planes as a function of orientation with respect to the applied stress field. The plastic strain of a deforming sample was monitored in-situ through a series of radiographs. Our results provide a measure of the dependence of creep rate of garnet on the temperature with an activation energy of ~280 kJ/mol and on pressure with an activation volume of ~10×10−6 m3/mol. The flow behavior of garnet quantified by this study provides the basis for modeling geodynamic processes occurring within subducted lithosphere.

     

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