Description

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.

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Name	Format	Description	Link
Yukon Geological Survey publication metadata	HTML		https://data.geology.gov.yk.ca/Reference/96117
Original metadata (https://open.yukon.ca)	HTML		https://open.yukon.ca/information/93cc7b09-7b56-47a5-a629-d4e4f21e3f5c
Appendices	ZIP		https://ygsftp.gov.yk.ca/ApexUploads/Publications/96117/Appendices.zip
Paper	PDF		https://ygsftp.gov.yk.ca/ApexUploads/Publications/96117/OF_2025-4.pdf

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