Abstract: This map presents a compilation and re-interpretation of the bedrock geology in the Mount Nansen area. It is an update from the preliminary version released in 2021. The main updates are based on new U-Pb zircon ages for Cretaceous magmatic rocks. Most economically significant are the CA-TIMS U-Pb zircon crystallization ages for the Kelly (ca. 78 Ma) and Cyprus porphyries (ca. 71 Ma) and the LA-ICPMS U-Pb zircon crystallization age of ca. 111 Ma for the Dickson Hill plug. New CA-TIMS crystallization ages (ca. 108 Ma) for two phases of the Bow Creek granite redefine that body as part of the Whitehorse magmatic suite and a new LA-ICPMS crystallization age of ca. 199 Ma from the deformed granodiorite which hosts the Brown-McDade deposit confirm a Minto suite designation for those rocks.

Authors: Sack, P., Eriks, N. and van Loon, S.

Map Scale: 1 : 50000

NTS Mapsheet(s): 115I02, 115I03

Citation: Sack, P., Eriks, N. and van Loon, S., 2022. Revised geological map of Mount Nansen area (NTS 115/I3 and part of 115I/2). Yukon Geological Survey, Open File 2022-4, 2 sheets: sheet 1 scale 1:50 000 and sheet 2 scale 1:20 000.

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