Final version published as: Thiessen, E. J., Gibson, H. D., Regis, D., Pehrsson, S. J., Ashley, K. T., & Smit, M. A. (2020). The distinct metamorphic stages and structural styles of the 1.94–1.86 Ga Snowbird Orogen, Northwest Territories, Canada. Journal of Metamorphic Geology, 38(9), 963–992. https://doi.org/10.1111/jmg.12556. The distinct metamorphic stages and structural styles of the 1.94 to 1.86 Ga Snowbird Orogen, Northwest Territories, Canada 1Thiessen, E.J., 1Gibson, H.D., 2Regis, D., 2Pehrsson, S.J., 3Ashley, K.T., and 4Smit, M.A. 1Department of Earth Sciences, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, V5A 1S6, Canada,
[email protected] 2Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, K1A 0E8, Canada 3Department of Geology and Environmental Science, University of Pittsburgh, 4107 O’Hara Street, Pittsburgh, Pennsylvania, United States 4Department of Earth, Ocean, and Atmospheric Sciences, University of British Columbia, 2020 2207 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada KEYWORDS Lu-Hf garnet, Petrochronology, Zr in rutile and titanite thermometry, solid inclusion barometry, Snowbird tectonic zone ABSTRACT Paleoproterozoic orogenesis within the Archean southeastern Rae craton is related to the initial amalgamation of Laurentia. Characterizing the accompanying tectonic processes during this time has been complicated due to polymetamorphism, which results in the obscuring of the age record of the terranes involved. To improve the knowledge of the tectonic evolution of the South Rae Craton, petrologic and structural analyses are applied in conjunction with in situ trace element chemistry, inclusion barometry, U-Pb monazite and titanite, and Lu-Hf garnet chronology.