Temperature dependence of elastic moduli of β-(Mg, Fe)2SiO4

Details Temperature dependence of elastic moduli of β-(Mg, Fe)2SiO4 Temperature dependence of elastic moduli of β-(Mg, Fe)2SiO4

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3104612m&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 4, CiteID L04612

Physics

5

Mineral Physics: Elasticity And Anelasticity, Physical Properties Of Rocks: Acoustic Properties, Tectonophysics: Earth'S Interior-Composition And State

Scientific paper

The elastic moduli of polycrystalline wadsleyite, β-(Mg0.91Fe0.09)2SiO4, were measured up to 470 K by means of the resonant sphere technique. The adiabatic bulk (KS) and shear (μ) moduli were found to be 165.72(6) and 105.43(2) GPa at room temperature. The average slopes (dKS/dT and dμ/dT) in the range were determined to be -0.0175(3) and -0.0159(1) GPa/K. We estimated that the P-, S-wave velocity and density jumps for the α- to β-phase transformation at the 410-km depth condition were 9.5, 11.2 and 5.4%, respectively. These results suggest that the olivine component at the depth should be 52 and 42 volume % for P- and S-waves.

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