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Publisher-reported update

2026-08-26

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.

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