Constitution of the mantle. I. Phase relations in the FeO-MgO-SiO2 system at 10-30 GPa

Details Constitution of the mantle. I. Phase relations in the FeO-MgO-SiO2 system at 10-30 GPa Constitution of the mantle. I. Phase relations in the FeO-MgO-SiO2 system at 10-30 GPa

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pepi...69...56f&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 69, Issue 1-2, p. 56-71.

Physics

6

Scientific paper

P-T-x phase diagrams of the FeO-MgO-SiO2 (FMS) system are calculated using the ideal solution model at 10-30 GPa and 1000-2000 K. A thermodynamic data base for minerals in the MgO-SiO2 and FeO-SiO2 systems is established by supplementing the calorimetric data for low-pressure phases and equations of state for all phases with data calculated from high-pressure synthesis experiments. The thermodynamic functions of virtual phases in the FeO-SiO2 system are evaluated. The topologies of calculated P-x sections of phase diagrams at 1273 K and 2000 K are in agreement with earlier experimental data. Univariant curves γ + St = Ilm + Mw, γ + Ilm = Pv + Mw + St intersect giving the nondegenerated invariant point (St + Mw + γ + Pv + Ilm) at T ~ 1650 K, P ~ 23 GPa and Fe/(Fe + Mg) ratios in the range 0.19-0.30. Univariant curves α + γ = β and Px + γ = β + St do not intersect in the calculated interval of P-T conditions. At temperatures higher than 1650 K, Ilm = Pv + γ + St and γ + St = Pv + Mw equilibria are stable. It is supposed that the disagreement between the earlier experimental phase diagrams is due to the experiments being carried out at temperatures above and below the invariant point.

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