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The western margin of the Churchill craton records a complex history of Paleoproterozoic tectonism. The most prominent of these tectonic events is recorded within the 2. 0–1. 9‐Ga Taltson‐Thelon magmatic zone. The widespread magmatism and high‐grade metamorphism of this zone, especially in Alberta and Saskatchewan, obscures an older tectonic belt, the ca. 2. 4–2. 3‐Ga Arrowsmith Orogeny. In the Uranium City region of northwestern Saskatchewan, a suite of Paleoproterozoic granites represent a magmatic product of this orogen. U‐Pb zircon crystallization ages were identified for the Macintosh Bay monzogranite (2330 5 Ma), the Gunnar monzogranite (2321 3 Ma), the Geebee Lake tonalite (2320 44 Ma), the Yahyah Lake granite (2287 14 Ma), and the Hayter Bay monzogranite (2297 10 Ma). The petrological and geochemical characteristics, emplacement ages, and Nd isotopic geochemistry of these plutons are most consistent with a syn‐ to postcollisional orogenic setting, possibly coeval with a period of orogenic extension and exhumation.
Hartlaub et al. (Wed,) studied this question.