The tectnothermal history of the Split Lake Block, Superior Province, Manitoba

This thesis reports the results of a comprehensive field, metamorphic, and geochronologic study of the Split Lake Block, northern Manitoba aimed to further our understanding of its origin and tectonothermal history. The Split Lake Block is a granulite terrane at the northwest margin of the Superior Province dominated by 2.8-3.1 Ga orthogneisses with rare metasediment that contain Paleoarchean detritus. The Split Lake Block has also been affected by three major episodes of deformation at 2702 Ma, 2695 Ma, and 2620 Ma with possible older metamorphic zircon growth at 2720 Ma and 2770 Ma. The first known conditions of metamorphism reported for the Split Lake Block are between 8-10 kbar and 750-920°C. The similarities between the nearby Pikwitonei Granulite Domain and the Split Lake Block suggest that these two areas share a common history.