Abstract
Concentrations of rare earth, alkali and alkaline earth elements in phenocryst and groundmass components of pyroclastic dacites have been measured. Mafic mineral rare-earth partition coefficients are much larger in these dacites than in more basic rocks. This may be due to differences in host ion concentrations in basic and acidic magmas. Because of these high partition coefficients, especially for hornblende, crystallization of appreciable hornblende, zircon and apatite could reduce the concentrations of rare earth elements in acidic magmas during crystallization differentiation.
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