Computer Science
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..67..261o&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 67, no. 2, Feb. 1983, p. 261-272.
Computer Science
13
Earth Mantle, Magma, Melting, Silicates, Garnets, Geochemistry, High Pressure, Seismic Waves
Scientific paper
The high pressure melting curves of minerals are used to estimate the densities of silicate liquids with basic, picritic, and ultrabasic compositions. Because silicate liquids generated by partial melting of the upper mantle are denser than olivine and pyroxenes at pressures higher than 70 kbar, it is suggested that Al-depleted komatiite with a high CaO-Al2O3 ratio is derivable from diapirs originating the deep upper mantle at pressures from 70 kbar to at least 140 kbar, corresponding to 200-400 km depths, where selective separation of pyropic garnet is expected at depths of more than 200 km, through the selective separation of garnet from ascending diapirs, and the 200-km seismic wave velocity profile discontinuity may be due to a high concentration of pyropic garnet at depths greater than 200 km.
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