Multielement analysis of purified mineral separates: a study of intermineral partitioning in differentiated silicate melts

Constituent materials in two differentiated rock complexes were separated and purified for quantitative multielement analysis. Modally weighted trace element concentrations conform well with whole-rock analyses and primarily reflect changes in the cumulus nature of the product. Different enrichment factors for individual minerals demonstrate pronounced departure from equilibrium and suggest minerals in the sample suite equilibrated towards evolving parental liquids. The results suggest that whole-rock trace element variations in plutonic rocks can be misleading whereas separated mineral data can provide valuable information on crystallization kinetics. (author) 23 refs.; 4 tables