Physics
Scientific paper
Feb 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pepi..105...21f&link_type=abstract
Physics of the Earth and Planetary Interiors, v. 105, p. 21-31.
Physics
78
Scientific paper
A pressure-volume-temperature data set has been obtained for MgSiO3 perovskite, using synchrotron X-ray diffraction with a laser-heated diamond-anvil cell. The unit cell parameters of the silicate perovskite were measured by angle dispersive X-ray diffraction using imaging plates up to pressures of 57 GPa and temperature in excess of 2500 K. These measurements are in good agreement with the previously reported data of Funamori et al. [Funamori, N., Yagi, T., Utsumi, W., Kondo, T., Uchida, T., Funamori, M., 1996. J. Geophys. Res. 101 (B4), 8257-8269] at lower pressure and yield (∂K/∂T)P = -0.017 GPa K-1 for a mixed value K'0 of 4 and a zero-pressure thermal expansion parameter α = 1.55 × 10-5 K-1 at 300 K. Assuming that the thermoelastic parameters of MgSiO3 perovskite are applicable to perovskites with moderate iron content, the comparison of the density and KT profiles calculated for a mixture of perovskite and magnesiowüstite and for PREM model indicates that a pure perovskite lower mantle is very unlikely. On the other hand, we obtain a very good match with PREM density and KT profiles for a mixture of 83 vol % (Mg0.93Fe0.07)SiO3 perovskite and 17 vol % (Mg0.79Fe0.21)O magnesiowüstite, compatible with a pyrolytic lower mantle.
Andrault Denis
Charpin Thomas
Dewaele Agnès
Fiquet Guillaume
Hausermann Daniel
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