Models for incompatible trace-element abundances in cumulus minerals and their application to plagioclase and pyroxenes in the Bushveld Complex

A mathematical model predicts the outcome of trapped liquids in causing variations in incompatible trace-element distribution in cumulus minerals. Variations occur with different modes in mineral composition. Concentrations of incompatible elements present in low abundance in the rock exhibit extreme enrichment compared to that in the original cumulus mineral. The application of different models on Bushveld Complex shows that plagioclase have Rb contents of 1-5 ppm. The rare earth elements in clinopyroxenes may be twice as much contained in parent liquid.