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The MgSiO3 system at high pressure: Thermodynamic properties of perovskite, postperovskite, and melt from global inversion of shock
 

Summary: The MgSiO3 system at high pressure: Thermodynamic properties of
perovskite, postperovskite, and melt from global inversion of shock
and static compression data
Jed L. Mosenfelder,1
Paul D. Asimow,1
Daniel J. Frost,2
David C. Rubie,2
and Thomas J. Ahrens1,3
Received 26 June 2008; accepted 3 November 2008; published 14 January 2009.
[1] We present new equation-of-state (EoS) data acquired by shock loading to pressures
up to 245 GPa on both low-density samples (MgSiO3 glass) and high-density,
polycrystalline aggregates (MgSiO3 perovskite + majorite). The latter samples were
synthesized using a large-volume press. Modeling indicates that these materials transform
to perovskite, postperovskite, and/or melt with increasing pressure on their Hugoniots.
We fit our results together with existing P-V-T data from dynamic and static compression
experiments to constrain the thermal EoS for the three phases, all of which are of
fundamental importance to the dynamics of the lower mantle. The EoS for perovskite and
postperovskite are well described with third-order Birch-Murnaghan isentropes, offset
with a Mie-Grušneisen-Debye formulation for thermal pressure. The addition of shock data
helps to distinguish among discrepant static studies of perovskite, and for

  

Source: Asimow, Paul D. - Division of Geological and Planetary Sciences, California Institute of Technology,

 

Collections: Geosciences