Physics
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11..229b&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 11, March 1984, p. 229-232.
Physics
28
Earth Mantle, Geodynamics, Mineralogy, Petrology, Elastic Properties, Geochemistry, Planetary Composition, Velocity
Scientific paper
The viability of pyrolitic and eclogitic assemblages for the mantle is tested through a study of the elastic properties of candidate mantle phases, for each of which high temperature adiabats are constructed and compared to mantle seismic properties. While both assemblage types satisfy seismic properties at 200-400 km, an eclogitic assemblage yields a superior match to velocities and velocity gradients at 400-670 km depths. Both the 400- and the 670-km discontinuities may represent chemical boundaries. Attention is given to past studies' assumption that the dominant minerals throughout the mantal are olivine, orthopyroxene, and smaller quantities of garnet and clinopyroxene. The compressional and shear velocities and the density of the minerals assumed as dominant are calculated for elevated temperatures and pressures, and compared to observed mantle velocities and temperatures.
Anderson David L.
Bass Jay D.
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