Elasticity of San Carlos olivine to 8 GPa and 1073 K

Details Elasticity of San Carlos olivine to 8 GPa and 1073 K Elasticity of San Carlos olivine to 8 GPa and 1073 K

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3216301l&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 16, CiteID L16301

Physics

14

Mineral Physics: Elasticity And Anelasticity, Mineral Physics: High-Pressure Behavior, Mineral Physics: Physical Thermodynamics, Physical Properties Of Rocks: Acoustic Properties, Tectonophysics: Earth'S Interior: Composition And State (1212, 7207, 7208, 8105)

Scientific paper

Elasticity of San Carlos olivine, (Mg0.9, Fe0.1)2SiO4, has been measured at simultaneous high pressure and high temperature to 8.2 GPa and 1073 K using ultrasonic interferometry in conjunction with synchrotron X-radiation. The elastic moduli and their pressure and temperature derivatives are precisely determined using a pressure standard free fit using third-order finite strain equations to the velocity and unit cell volume data in the entire pressure and temperature range, yielding KS0 = 130.3(4) GPa, G0 = 77.4(2) GPa, K'S0 = 4.61(11), G'0 = 1.61(4), ∂KS/∂T = -0.0164(5) GPa/K, and ∂G/∂T = -0.0130(3) GPa/K. Combined with previous thermoelastic data on wadsleyite, the velocity contrasts between α- and β-(Mg, Fe)2SiO4 at 410-km depth are calculated along a 1673 K adiabatic geotherm with plausible iron partition between the two phases. The fraction of olivine consistent with a ~5% seismic discontinuity in an anhydrous mantle is constrained to be less than ~50% with the possibility that a hydrous or a cooler mantle increases the olivine content towards pyrolitic composition.

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