Late Triassic to Jurassic Magmatic and Tectonic Evolution of the Intermontane Terranes in Yukon, Northern Canadian Cordillera: Transition From Arc to Syn‐Collisional Magmatism and Post‐Collisional Lithospheric Delamination

End-on arc collision and onset of the northern Cordilleran orogen is recorded in Late Triassic to Jurassic plutons Intermontane terranes Yukon, development synorogenic Whitehorse trough (WT). A synthesis extensive data set for these supports interpretation magmatic tectonic evolution terranes. juvenile that locally intrude Yukon-Tanana terrane represent extension magmatism within Stikinia. Early Stikinia were emplaced during crustal thickening (200–195 Ma) subsequent exhumation (190–178 Ma). The syn-collisional migrated south shows increasing contributions with time. This style Yukon contrasts coeval, British Columbia (Hazelton Group), records southward migration Jurassic. Exhumation subsidence WT north probably linked retreating Hazelton by a sinistral transform. East WT, intruded into record continued Quesnellia. Middle after final enclosure Cache Creek imbrication post-collisional have isotopic compositions that, together stratigraphic evidence surface uplift, are interpreted asthenospheric upwelling lithospheric delamination. revised model proposes entrapment was result slab rollback transform fault system zone north.