Petrology and Geochemistry of an Archean Migmatite Terrain, Favourable Lake Area, Northwest Ontario

Abstract

<p> The "F-Zone" is part of a migmatitic, radiometrically anomalous belt which forms the contact between a large granitic batholith and a region of homogeneous diatexite. Petrographic and geochemical analysis (including whole rock and rare-earth element analyses) of these three units has been carried out. Results indicate that the batholith was formed by partial fusion of sedimentary and volcanic material; the homogeneous diatexite arose in a similar way although fusion was less complete and; the migmatite incorporates material from both of these units. Late stage metasomatic-hydrothermal activity has concentrated uranium from the country rock in the migmatite zone.</p>