Geochronological constraints on deformation in the Wager shear zone, northwestern Hudson Bay, Nunavut

The Wager shear zone (WSZ) is a major eastor west-trending zone of high strain located on the northwestern coast of Hudson Bay. New geological mapping was conducted along the structure during the summer of 2017 as part of a project that aims to better constrain the timing, duration and kinematics of the deformational events recorded by the WSZ and to interpret these events in a regional geological context. Asuite of granitoid samples was collected from rocks variably affected by the WSZ for U-Pb zircon geochronology to place constraints on the timing of deformation. This paper presents the preliminary results for five of these samples, which range in age between 1895 and 1826 Ma, and indicate that the WSZ was actively deforming, at least locally, at ca. 1835–1826 Ma, coeval with peak Hudsonian-age plutonism in the region.