New geochronological and geochemical data for Permian rocks of the western Yukon-Tanana terrane, Klondike district, Yukon
New U-Pb zircon dates from Permian rocks of the Yukon-Tanana terrane in the Klondike district of western Yukon provide new constraints on timing of intrusions and deposition. The new data shows that significant Pb-loss affected zircon in metamorphic rocks of the Yukon-Tanana terrane. The new, high-precision CA-TIMS dating shows that all intrusions in the region are ca. 261 Ma and eliminate previous constraints on the Klondike orogeny. A review of lithogeochemical data and new Lu-Hf isotope data for zircon support development of the Klondike assemblage in back-arc to continental arc settings. New 40Ar/39Ar data for Permian metaplutonic rocks indicates cooling below 300-350°C in the Early Jurassic.
Le gouvernement du Yukon reconnaît l’existence des territoires traditionnels des peuples autochtones partout au Yukon et souligne leur intendance de la terre et de l’eau ainsi que leur lien ancestral avec le territoire.
