Eric Yang

Precambrian Geologist
Manitoba Geological Survey

Updating the study of granitoids in Manitoba: Metallogenic and petrogentic implications 

This talk provides an update on the study of granitoids in Manitoba and its significance for granitoid-related mineralization (in particularly for critical minerals, e.g., Li, Cs, Ta) and petrogenesis. A variety of petrogenetic types of granitoids (e.g., I-, S- and A-type, TTG, sanukitoid, and adakite-like) were identified to occur in Manitoban parts of the Trans-Hudson orogen and the western Superior province. These granitoid rocks are characterized mainly based on field observations, textures (fabrics), magnetic susceptibilitiy (MS), mineral assemblages, petrography, the presence of mineralization and/or alteration, and geochemical and Nd isotope analytical data in order to evaluate their geodynamic settings, petrogenesis, mineralization potential and metallogeny. The major findings of this study are that muscovite- and/or garnet-bearing granitic rocks (i.e., strongly peraluminous or rare-metal related S-type), characterized by low MS values (<0.1×10-3 SI unit), ferroan and calc-alkaline affinities intruded exclusively into and/or occur close to collisional (and/or terrane/domain boundary) zones.