Homogeneity and temperatures in the lower mantle |
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| Authors: | TJ Shankland JM Brown |
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| Institution: | Geophysics Group, Los Alamos National Laboratory, Los Alamos, NM 87545 U.S.A.;Department of Geophysics, Texas A&M University, College Station, TX 77843 U.S.A. |
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| Abstract: | Using the three global seismic profiles, model 1066B, PEM, and PREM, we have calculated adiabatic temperature profiles, 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 ± 500°C inferred from shock melting experiments on iron. |
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