|dc.description.abstract||The Pater metavolcanic suite (PVS) was extruded as part
O'f the basal Pater Formation of the Huronian Supergroup ca.
2.4 Ga. They Ars classified as wi thin-plate tholeiites
associated with an immature ri-fting episode, and are
inter layered with associated vol cani clastic and
Post-solidif ication alteration caused redistribution o-f
the alkalies, Sr, Rb, Ba, Cu, and SiO^. Ce, Y, Zr, CFezOs
(as total Fe), Al^Os, TiOa, and, PaOa are considered to have
remained essentially immobile in least altered samples.
Petrogenetic modelling indicates the PVS was derived
from the partial melting of two geochemical ly similar
sources in the sub-continental lithosphere. Fractionation
was characterized by an oli vine-plagioclase assemblage and a
sub-volcanic plagioclase-clinopyroxene assemblage.
A comparative study indicates that enrichment of the
postulated Huronian source cannot be reconciled by Archean
contamination. Enrichment is thought to have been caused by
hydrous veined metasomatic heterogeneities in the
sub-continental lithosphere, generated by an Archean
subduct ion event before 2.68 Ga.||en_US