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Metamorphic complex of SE Canadian Cordillera and relationship to foreland thrusting

Summary The Rocky Mountain miogeocline thickens westward into a basin that was established during the Proterozoic. The western margin of the basin is flanked by a platform that was developed upon Aphebian continental crust. These Aphebian rocks comprise the basement gneisses of the Shuswap Complex that have telescoped onto the cratonic margin of North America. The floor of the basin is assumed to have been transitional or oceanic crust that was subducted westward beneath the Aphebian continental crust of the Shuswap Complex. Deformation of the platform and western margin of the basin was initiated in the Palaeozoic and culminated in the Jurassic. Development of easterly overturned folds in the basin and thrust faults along its eastern margin occurred during the final stages of ductile shortening of the basin. Thrust faults developed in the western margin of the miogeocline and deformation migrated eastward as the Shuswap Complex encroached upon the cratonic margin of the North American plate. Eastward displacements of allochthonous cover rocks of the Shuswap Complex are post metamorphic events that are most likely interlocked with thrust faulting in the western margin of the Rocky Mountain miogeocline. Westward underthrusting of the basement of the miogeocline probably ceased by late Eocene and a regime of NE-SW extension was established. Most recent movements of allochthonous cover rocks and late doming of the metamorphic complex are related to this period of Tertiary extension.