Physics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pepi...45..324i&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 45, Issue 4, p. 324-336.
Physics
76
Scientific paper
The pyroxene-garnet transformation in a model pyrolite composition has been investigated over the pressure interval 4.0 to 17.5 GPa at temperatures of 1200-1400°C. The transformation is largely completed in the pressure interval 14-16 GPa, and a single phase aluminum-deficient garnet (majorite) becomes stable above 16 GPa. The mineral assemblages and the density and seismic velocity distributions for pyrolite are calculated as a function of depth on the basis of this and other recent experimental data. Density and seismic velocity profiles calculated for pyrolite are consistent with models based on seismic observations to a depth of 550 km. If the existence of a high density/velocity gradient between 550 km and 650 km is confirmed, the presence of further phase transformations in majorite and/or some degree of chemical heterogeneity in this depth interval would be indicated.
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