The elastic constants of a pyrope-grossular-almandine garnet to 20 Gpa

Details The elastic constants of a pyrope-grossular-almandine garnet to 20 Gpa The elastic constants of a pyrope-grossular-almandine garnet to 20 Gpa

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24..523c&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 5, p. 523-526

Physics

24

Mineral Physics: Elasticity And Anelasticity, Mineral Physics: Equations Of State, Mineral Physics: High-Pressure Behavior, Mineralogy And Petrology: Experimental Mineralogy And Petrology

Scientific paper

Laser-induced phonon spectroscopy has been applied to the determination of the elastic constants and equation of state at 25°C of a natural garnet of composition Py51.6Al31.7Gr15.8Sp0.9 to a pressure of 20 GPa. Moduli are linear with pressure. The adiabatic bulk modulus in GPa is given by K=170.8+4.09P and the shear modulus is μ=94.7+1.76P. The derivative of the shear modulus with respect to temperature at constant density is derived from the temperature and pressure dependencies of the elastic constants. The constant pressure derivatives of the mean longitudinal (Vp) and shear (Vs) velocities are tabulated. At 298 K and 1 bar (∂lnVp/∂lnρ)p=1.7, (∂lnVs/∂lnρ)p=1.5 and (∂lnVs/∂lnVp)p=0.9. The corresponding values calculated at 1000 K and 20 GPa are 1.6, 1.7, and 1.1.

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