Single-crystal elasticity of γ-(Mg0.91Fe0.09)2SiO4 to high pressures and to high temperatures

Details Single-crystal elasticity of γ-(Mg0.91Fe0.09)2SiO4 to high pressures and to high temperatures Single-crystal elasticity of γ-(Mg0.91Fe0.09)2SiO4 to high pressures and to high temperatures

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.4335s&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 22, p. 4335-4338

Physics

19

Geochemistry: Composition Of The Mantle, Mineral Physics: Elasticity And Anelasticity, Mineral Physics: Equations Of State, Mineral Physics: High-Pressure Behavior

Scientific paper

Sound velocities and elastic moduli have been measured on γ-(Mg0.91Fe0.09)2SiO4 (ringwoodite) single-crystals to 16 GPa and to 923K by Brillouin spectroscopy. A third-order finite-strain fit to the data yields pressure derivatives of 4.1(2) and 1.3(1) for the adiabatic bulk modulus (Ks) and shear modulus (μ) respectively. Mg-rich α, β, and γ(Mg,Fe)2SiO4 have identical values of ∂KS/∂P and of ∂μ/∂P within the experimental uncertainties. ∂KS/∂T and ∂μ/∂T for γ-(Mg,Fe)2SiO4 are -0.021 and -0.016 GPa/K respectively. Our results indicate that the shear and compressional impedance contrasts associated with β- -> γ-(Mg,Fe)2SiO4 transition are sufficient to produce a visible discontinuity at 520 km even with a moderate (30-50%) amount of olivine. The generally low visibility of the 520 km discontinuity is likely due to its width and large amplitude topographic variations.

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