| This study focuses on rocks of the southern Omineca Belt near Shuswap Lake, B.C., deposited at the margin of Ancestral North America. The contact between two different lithometamorphic assemblages, the Eagle Bay Formation and the Queest Mountain assemblage, and their contact relationships with a pluton, are studied to provide constraints on the Paleozoic tectonic history of the area.; The Queest Mountain assemblage is separated from the Eagle Bay Formation by the Queest Mountain fault, dipping 16 to 30 degrees north. Pressure and temperature differences across this fault suggest 14 to 25 km of normal displacement. The pluton, dated at 365.9 ± 2.7 Ma by U-Pb zircon geochronology, and correlated with the Mount Fowler Batholith, cuts foliation in the country rock, and cross-cuts the Queest Mountain fault, recording Early to Middle Paleozoic compressional deformation and margin-parallel extension, likely related to subduction and intra-arc tectonism, possibly correlative with the Antler orogeny. |
