Abstract
Fifteen rocks from St. Paul's Rocks have been analyzed for rare earth elements (REE). All the samples studied have RE distributions relatively enriched in the light REE relative to the chondritic RE distribution. The trend of light RE enrichment correlates with potassium abundance and appears to be determined by the abundance of amphibole (pargasite). None of the rocks appear to be examples of undifferentiated upper mantle or simple residues left after partial melting. Various geologic processes are considered as models for generating light RE enriched ultramafic rocks. The rocks with abundant brown hornblende have RE abundances similar to alkali olivine basalt dredged from the nearby sea floor.
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