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Paleoproterozoic Metamorphism in the Northern Wyoming Province: Implications for the Assembly of Laurentia
2005
The Journal of geology
A B S T R A C T U-Pb ages measured on zircons from the Tobacco Root Mountains and monazite from the Highland Mountains indicate that the northwestern Wyoming province experienced an episode of high-grade metamorphism at ∼1.77 Ga. Leucosome emplaced in Archean gneisses from the Tobacco Root Mountains contains a distinctive population of zircons with an age of 1.77 Ga but also contains zircons to ∼3.5 Ga; it is interpreted to have been derived primarily by anatexis of nearby Archean schist. A
doi:10.1086/427667
fatcat:bzshf5tjonfsfhdqujgjizl5qi