Rare earth concentrations in zircons and apatites and their host dacites and granites

Abstract Rare earth element concentrations in zircons and apatites separated from dacites and granites have been measured. Partition coefficients between phenocrysts of zircon and apatite and the groundmass materials of dacites may be explained by the crystal structure of the minerals. The rare earth patterns of zircons from granites appear to reflect patterns of the liquid phase at earlier stages of crystallization.