RARE-EARTH DISTRIBUTION IN ARCHEAN GRANITOID PLUTONS OF THE WABIGOON VOLCANIC-PLUTONIC BELT, NORTHWESTERN ONTARIO

Rare earths (La to Lu, Y) are investigated for five Archean granitoid stocks of Kenoran age that intrude the Wabigoon volcanic-plutonic belt. Homogeneous granodiorites are characterized by low total rare earth concentrations, with chondrite-normalized REE (rare earth elements) patterns that show steep negative slopes, no Eu anomalies, and enrichment of Lu. Quantitative source modeling should consider the complete magma history of emplacement, crystallization, and deuteric metasomatism.