Abstracts
Summary
New concepts of western Cordillerangeology involve the assembly of exoticblocks of crust through large northwardmovements and strike-slip faulting. Thesecan only be valid if the regional platetectonic framework provides a suitablemechanism. The geometrical recon-struction of global plate motions showsthat throughout the last 100 Ma, platemovements along the western marginhave been appropriate. Movement hasbeen northward relative to North Americaat high rates and has alternated betweenconvergence and north-westerly strike-slip faulting. Local details must becompatible but cannot be resolved bysuch broad reconstructions.
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