Geology and tectonic setting of the Oldman-Bulyea shear zone, northern Saskatchewan, Canada

The study area is located in northern Saskatchewan within the Rae Province. This study focuses on the tectonic development of the Oldman-Bulyea shear zone, a major discontinuity separating the Nevins Lake Block and the Train Lake Domain.; The Nevins Lake Block is dominated by granulite-facies pelitic to psammopelitic metasedimentary rocks and subordinate mafic granulite. Approaching and within the Oldman-Bulyea shear zone, garnet has been partly or wholly replaced by biotite, indicating a later metasomatic/retrogressive event. In contrast to the Nevins Lake Block, the upper amphibolite-facies Train Lake Domain is characterized by abundant medium-grained plutonic and gneissic plutonic rocks of dominantly granodioritic to leucotonalitic composition, with subordinate rafts and screens of finer-grained mafic to intermediate rocks of probable volcanic origin. Both domains were intruded by several igneous suites during and subsequent to deformation in the Oldman-Bulyea shear zone.; Rocks in the vicinity of the Oldman-Bulyea shear zone have been deformed at least five times.; Four samples representative of major rock units were dated by U-Pb geochronology. (Abstract shortened by UMI.)...