One Hundred Million Years of Plate Tectonics in Western Canada

R. P. Riddihough

Abstract


New concepts of western Cordilleran geology involve the assembly of exotic blocks of crust through large northward movements and strike-slip faulting. These can only be valid if the regional plate tectonic framework provides a suitable mechanism. The geometrical reconstruction of global plate motions shows that throughout the last 100 Ma, plate movements along the western margin have been appropriate. Movement has been northward relative to North America at high rates and has alternated between convergence and north-westerly strike-slip faulting. Local details must be compatible but cannot be resolved by such broad reconstructions.

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