Abstract
Two samples of Pelly Gneiss with different field relations and post-crystallization histories give different U/Pb ages that are Devonian and Permian (375 and 276 Ma). A sample of Klotassin granodiorite gave an age of 192 Ma confirming its Early Jurassic age. These Devonian, Permian, and Jurassic plutonic rocks in Yukon Crystalline Terrane lack equivalents in the adjacent Omineca Belt where sedimentary strata accumulated at these times. This suggests that the Yukon Crystalline Terrane is allochthonous with respect to the Omineca Belt.
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