A theoretical attempt to interpret patterns of trace element partitioning in silicate minerals

Abstract

Using the conformal solution theory of molten salts (REISS et al., 1962; DAVIS and RICE, 1964; BLANDER, 1967), an attempt was made to interpret the patterns of the partition coefficients of trace elements in silicate minerals as a function of ionic radius. It is shown that the partition coefficient is represented to the zeroth order approximation by the quadratic equation of ionic radius in a “simple” homovalent substitution where host and guest cations are of primarily ionic nature. Pressure effects on the partition coefficient of a trace component are qualitatively discussed with emphasis on the interrelationship of melting points between major and minor components.