Olivine melting phase relations

Jones JH (1995) Experimental trace element partitioning. In Ahrens TJ (ed) Rock physics and phase relations A handbook of physical constants Am Geophys Union Reference Shelf 3 73-104 Kennedy AK, Lofgren GE, Wasserburg GJ (1993) An experimental study of trace element partitioning between olivine orthopyroxene and melt in chondrales equilibrium values and kinetic effects. Earth Planet Sci Lett 115 177-195... 

Akaogi, M., N. L. Ross, P. McMillan, and A. Navrotsky (1984). The Mg2Si04 polymorphs (olivine, modified spinel, spinel)—thermodynamic properties from oxide melt solution calorimetry, phase relations, and models of lattice vibrations. Amer. Mineral. 69, 499-512. 

Mysen B. O., Virgo D., and Scarfe C. M. (1980). Relation between the anionic structure and viscosity of silicate melts A Raman spectroscopic study. Amer. Mineral, 65 690-710. Nafziger R. H. and Muan A. (1967). Equilibrium phase compositions and thermodynamic properties of olivines and pyroxenes in the system MgO-FeO-SiOj. Amer. Mineral, 52 1364-1384. 

Equation (E2) can be used to determine the activity of silica in a melt if both olivine and pyroxene coexist in equilibrium with the same melt. The data required to make the calculations are temperature, pressure, compositions of the solid solutions and an expression relating the activities of the solid phases to their compositions. For the moment, the progressive substitution of Fe for Mg in both olivine and pyroxene will be ignored and silicate melts will be characterized in terms of silica activity defined by the pure end members (i.e., at unit activity). During the... 

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