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Chinese Journal of High Pressure Physics  > 2007  >  21(1): 45-54 .
YANG Jin-Ke, GONG Zi-Zheng, DENG Li-Wei, ZHANG Li, FEI Ying-Wei. Equation of State and Phase Transition of (Mg0.92, Fe0.08) SiO3 Enstatite under Shock Compression and Its Geophysical Implications[J]. Chinese Journal of High Pressure Physics, 2007, 21(1): 45-54 . doi: 10.11858/gywlxb.2007.01.008
Citation: YANG Jin-Ke, GONG Zi-Zheng, DENG Li-Wei, ZHANG Li, FEI Ying-Wei. Equation of State and Phase Transition of (Mg0.92, Fe0.08) SiO3 Enstatite under Shock Compression and Its Geophysical Implications[J]. Chinese Journal of High Pressure Physics, 2007, 21(1): 45-54 . doi: 10.11858/gywlxb.2007.01.008
shu

Equation of State and Phase Transition of (Mg0.92, Fe0.08) SiO3 Enstatite under Shock Compression and Its Geophysical Implications

doi: 10.11858/gywlxb.2007.01.008
  • 1.

    Institute of High Pressure & High Temperature Physics, Southwest Jiaotong University, Chengdu 610031, China;

  • 2.

    Beijing Institute of Spacecraft Environment Engineering, Beijing 100094, China;

  • 3.

    Geophysical Laboratory, Carnegie Institution of Washington, Washington DC 20015, USA

More Information
  • Corresponding author: GONG Zi-Zheng
  • Received Date: 12 Oct 2005
  • Rev Recd Date: 12 Jan 2006
  • Publish Date: 05 Mar 2007
    Abstract
  • We performed shock wave experiments on a natural pyroxene with chemical composition close to (Mg0.92, Fe0.08)SiO3 and initial density of 3.06 g/cm3 at pressures between 48 and 140 GPa, using impedance match method and electrical probe technique. Considering McQueen et. al. data, it is obvious that (Mg0.92, Fe0.08)SiO3 goes through three phase regions in the procedure of shock compression: Low-pressure phase region (LPR), mixed phase region (MPR), and high-pressure phase region (HPR), corresponding to the pressure 0~40 GPa, 40~67 GPa and 68~140 GPa, respectively. In low-pressure phase region, the relationship between shock wave velocity D and particle velocity u was expressed by McQueen et. al. data. Then in high-pressure phase region (at pressures between 68 to 140 GPa), it can be described linearly from our experiment data. The calculated D-u relationship for the assemblage of (Mg0.92, Fe0.08)O(Mw)+SiO2(St) is significantly different from the experimental data, excluding the possibility of chemical decomposition of perovskite to oxides during the shock compression. The Grneisen parameter can be obtained by fitting the experimental data. Using the third-order Birch-Murnaghan finite strain equation of state, the shock experimental data yield a zero-pressure bulk modulus K0S=259.6(9) GPa and its pressure derivative K0S=4.20(5), with 0=4.19 g/cm3. A comparison of the experimental Hugoniot densities of perovskite with the PREM density profile prefers a perovskite-dominant lower mantle model.

     

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