Distribution Coefficients for La, Sm, SC and CO Between Plagioclase and Low La-Magma

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Anorthosites, Distribution Coefficient, Magma, Plagioclase, Trace Elements

Scientific paper

The concentrations of Na, La, Ce, Sm, Eu, Fe, Co and Sc in a few tens of mg samples of plagioclases and their host lavas were determined with INAA for low-La and low-alkaline tholeiites from Japan. The data suggest that Henry's law holds in the case of plagioclase down to 0.1 ppm level concentrations. The variations of the distribution coefficients (D's) for La, Ce, Sm, Co and Sc are small compared with the varieties of the host magmas, in which concentrations vary by 2 orders of magnitude. The D of Sc is minimum and is available as a criteria of the maximum contamination of the magmatic component with plagioclase. Plagioclase records quantitatively the composition of the host magma not only for incompatible elements (LREEs), but also for compatible elements (Co) during magmatic processes. These records reveal the evolution of host magmas and their origin, and are applicable to the lunar anorthosites.

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