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Chemical zonation of phenocryst phases present a record of the physicochemical changes in magma from which they crystallized. Several recent studies (e.g., Bottinga et al., 1966; Albarede and Bottinga, 1972; Kirkpatrick, 1976, 1977; Sibley et al., 1976; Shimizu, 1978) have addressed the zonation of major and trace elements in plagioclase from the point of view of the growth dynamics from a magma and have shown that disequilibrium composition features of the phenocrysts should provide a better understanding of the physicochemical evolution of the associated magma. As diffusion coefficients, growth rates, and chemical composition of phenocrysts as a function of supercooling become available, parameters like cooling rates and non-equilibrium partition of trace elements of crystallizing magmas may be modeled quantitatively. Oceanic basalts are among the terrestrial volcanic rocks that show relatively little differentiation from primitive liquids originating in the mantle and do not seem to show extensive mixing from different sources. Their relatively simple crystallization history make them well suited for the detailed study of the chemical zonation of their phenocryst assemblages.

Chemical Zonation of Plagioclase Phenocrysts from Leg 51, 52, and 53 Basalts