Yukon Geological Survey publication metadata (English, HTML)

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Publisher-reported update

2026-08-26

The Permian evolution of the Yukon‐Tanana terrane and closure of the Slide Mountain Ocean in the northern Cordillera have been inferred to culminate in the collisional “Klondike orogeny,” a northern extension of the Sonoma orogeny of the western USA. The “Klondike orogeny” was thought to be associated with mid‐crustal deformation and metamorphism and development of a thick orogenic welt in the late Permian (ca. 260–252 Ma; Lopingian). A review of lithogeochemical data combined with new U‐Pb geochronology and Hf isotope data of igneous and detrital zircons from the western Yukon‐Tanana terrane supports development of a mid to late Permian (ca. 265–255 Ma; Guadalupian‐Lopingian) arc in a supra‐subduction zone setting. Arc development was preceded by hyper‐extension and emplacement of supra‐subduction zone ophiolites (ca. 268–264 Ma). Precise CA‐TIMS U‐Pb dating of zircon in plutons inferred to constrain the timing of the “Klondike orogeny” show that they are the same age (ca. 260.9 Ma) and that previous dates are too young due to unmitigated Pb loss. A critical review of evidence for regional metamorphism indicates that mid‐crustal deformation and metamorphism is related to…

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