Some geophysical constraints on the chemical composition of the earth's lower mantle

Abstract The physical properties(ϱ, K, K′) of the adiabatically decompressed lower mantle are interpreted in terms of an (Mg,Fe)SiO3 perovskite + magnesiowustite mineralogy. The approach employed in this paper involves the removal of the relatively better characterised magnesiowustite component from the two-phase mixture in order to highlight the physical properties required of the perovskite phase for consistency between the seismological data and any proposed compositional model. It is concluded that a wide tradeoff (emphasized by Davies [1]) between composition, temperature and the physical properties (especially thermal expansion) of the perovskite phase accommodates most recently proposed compositional models including Ringwood's [2] pyrolite and the more silicic models of Burdick and Anderson [3], Anderson [4], Sawamoto [5], Butler and Anderson [6], Liu [7,8] and Watt and Ahrens [9].

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