Melting experiments of mantle materials under lower mantle conditions with implications for magma ocean differentiation

Details Melting experiments of mantle materials under lower mantle conditions with implications for magma ocean differentiation Melting experiments of mantle materials under lower mantle conditions with implications for magma ocean differentiation

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pepi..143..397i&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 143, p. 397-406.

Physics

17

Scientific paper

Liquidus phase relations and major element partitioning have been determined for fertile peridotite and CI chondritic mantle material to 33 and 35GPa, respectively. In peridotite, the first liquidus phase changes from ferropericlase to Mg-perovskite at 31GPa, and at 33GPa liquidus Mg-perovskite is successively followed down temperature by ferropericlase and Ca-perovskite within a small temperature range. In CI chondritic mantle, Mg-perovskite is the liquidus phase followed down temperature by Ca-perovskite at pressures higher than 28GPa. Ferropericlase is absent at the liquidus. Differentiation by crystal fractionation of Mg-perovskite, ferropericlase, and Ca-perovskite in a deep magma ocean has been examined for a CI chondritic and two peridotitic bulk silicate earth models. Mass balance indicates that subtraction of about 40% Mg-perovskite and 2% Ca-perovskite from a CI chondritic bulk silicate earth yields a residual melt with some characteristics of model fertile upper mantle composition. A crystal layer composed of Mg- and Ca-perovskites would pile up to a depth ca. 1400km, and may be characterized as an enriched and possibly heat-producing reservoir by the high capability of Ca-perovskite to accommodate large cations such as La and alkaline elements. The observed effect of pressure on element partitioning indicates that better mass balance solutions may be obtained for higher pressure liquidus phase compositions. For peridotitic bulk silicate earth models, fractionation would be quite limited, up to 10wt.% of Mg-perovskite in addition to trace amount of Ca-Pv.

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