Abstract
The western Canadian Arctic is underlain by a thick (more than 10 km) succession of Proterozoic sediments, metasediments and volcanics that were instrumental in localizing and controlling the distribution and subsurface geometry of young (Paleozoic and Mesozoic) faults. Recent observations from seismic reflection data have illustrated areas associated with Mesozoic extension (Beaufort-Mackenzie Basin) and Mesozoic compression (Colville hills) where the deep, layered sequences of the Proterozoic strata are seen to focus the position of the young faults. In addition, middle Paleozoic compressional structures associated with a NE-trending Ellesmerian deformation front along the Tuktoyaktuk Peninsula are also localized along Proterozoic layers that were associated with a major crustal scale ramp. It appears that many of the structures in this part of Canada record a protracted history of reactivation of ancient structures as various tectonic forces acted through its development.
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