Homogeneity and temperatures in the lower mantle

Details Homogeneity and temperatures in the lower mantle Homogeneity and temperatures in the lower mantle

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...38...51s&link_type=abstract

Physics of the Earth and Planetary Interiors (ISSN 0031-9201), vol. 38, March 30, 1985, p. 51-58.

Physics

33

Earth Mantle, Geotemperature, Seismology, Thermal Boundary Layer, Adiabatic Conditions, Temperature Gradients, Temperature Profiles, Thermal Expansion

Scientific paper

Using the three global seismic profiles, model 1066B, PEM, and PREM, adiabatic temperature profiles are calculated, as well as, corrections arising from the differences between adiabatic self compression on the seismic and convective time scales, and the superadiabatic profiles from inhomogeneity. The three adiabatic temperature profiles are virtually identical and provide a net change of 600 K across the lower mantle; the net superadiabatic temperature changes from inhomogeneity are also similar and provide a further 200 K. If elastic relaxation corrections of 400-700 K are included in addition to a thermal boundary layer arising from heat transfer from the core to the base of the mantle, then it is possible to construct mantle profiles beginning with 1600 C at 670 km and yielding temperatures at the core-mantle boundary within the range 3300 + or - 500 C inferred from shock melting experiments on iron.

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