Thermal expansivity in the lower mantle

Details Thermal expansivity in the lower mantle Thermal expansivity in the lower mantle

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1983c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 19, p. 1983-1986.

Physics

131

Earth Mantle, Perovskites, Thermal Boundary Layer, Thermal Expansion, High Pressure, High Temperature, Pressure Dependence

Scientific paper

The pressure dependence of the thermal expansion coefficient alpha is refined. It is found that alpha decreases by a factor of 5 for MgO throughout the mantle, reaching a value of 1.0 x 10 exp -5/K at its bottom. Densities of perovskite (PV) and magnesiowustite (MW) are calculated for lower mantle conditions using a new alpha(P,T) relation, a room-temperature finite strain equation, and recent data on Mg-Fe partitioning in the PV-MW system.

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