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New geochronological and geochemical data from the Yukon's Windy-McKinley terrane provide insights into its subdivisions. U-Pb zircon age determinations for felsic meta-volcanic rocks are Late Devonian, and for gabbro intrusions are late Middle Triassic. Trace-element data from gabbro intrusions and ophiolite components suggest magmatism occurred in supra-subduction zone settings.
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