Physics
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pepi...33...12o&link_type=abstract
Physics of the Earth and Planetary Interiors (ISSN 0031-9201), vol. 33, Aug. 1983, p. 12-25.
Physics
47
Earth Mantle, Fusion (Melting), Geotemperature, Perovskites, Phase Diagrams, Temperature Distribution, Fractionation, Geochemistry, Melting Points, Phase Transformations, Thermodynamic Properties
Scientific paper
An estimation of the melting curve of MgSiO3 at high pressures and the liquidus and solidus curves of the lower mantle is presented. From thermodynamic data and the results of high pressure experiments on melting and phase transitions in the MgO-SiO3 system, the initial slope of the melting curve of perovskite MgSiO3 is 77 + or - 8 K/GPa. An expression of the melting curve is presented in terms of the Kraut-Kennedy equation. The liquidus temperature at the base of the lower mantle is about 7000 K; the solidus curve extrapolated to the lower mantle by using the slope of the melting temperature of magnesiowuestite is about 5000 K at the base of the lower mantle. The chemical fractionation expected to occur as a result of the melting of the lower mantle is discussed, and the density of melts in the MgO-FeO-SiO2 system at high pressure is estimated.
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