Linear partitioning theory applied to the Earth's 410-km discontinuity

Details Linear partitioning theory applied to the Earth's 410-km discontinuity Linear partitioning theory applied to the Earth's 410-km discontinuity

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.1987m&link_type=abstract

Geophysical Research Letters, Volume 25, Issue 11, p. 1987-1990

Physics

Tectonophysics: Earth'S Interior-Composition And State, Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineralogy And Petrology: Metamorphic Petrology, Seismology: Lithosphere And Upper Mantle

Scientific paper

The theory of linear partitioning in binary solutions is here extended to solid-solid equilibria in P-X space at constant T, with general rules for formulating the linear relationship. When the interphase partition coefficient, formulated for the Fe endmember, is linear with the composition of the numerator phase, the exchange coefficient KD is constant, and vice versa. For olivine-wadsleyite in P-X, the four best experimental brackets in the literature give KD=0.56+/-0.02 (1-s.d.) at 1600°C. The S-S transition at XFe=0.1 is 2.8 kb or about 8 km wide for pure olivine. Half the olivine is converted to wadsleyite at 0.6 the P interval. However, a transition zone lid <=4 km thick is consistent with a multiphase mantle in which the presence of a non-transforming phase (e.g., pyroxene) cuts the effective transformation window in half as recently shown by L. Stixrude.

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