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Natural Resources Canada > Earth Sciences Sector > Priorities (2002-2006) > Northern resources development > Western Churchill Metallogeny Project
Western Churchill Metallogeny Project Southwestern Margin of the Western Churchill Province: A Synthesis
K. Ashton
The southwestern margin of the Rae Province is flanked by several largely buried domains that have been defined based on geophysics and geochronological data collected from drill core. Temporal and spatial analysis of the latter dataset suggests: 1) terrane accretion via east-dipping subduction at about 2.35 Ga (possible northern extent in Queen Maud Block), 2) rifting away and/or amalgamation of an enigmatic Archean Chinchaga-Buffalo Head terrane during the 2.2-2.0 Ga interval that underwent regional metamorphism at 2.09-2.04 Ga, 3) collision of the Archean Nova (possibly a slice off the Slave craton) and Chinchaga-Buffalo Head terranes via east-dipping subduction at 1.98 Ga, followed by 4) accretion of the newly amalgamated Nova-Chinchaga-Buffalo Head terrane to the Rae margin via east-dipping subduction at about 1.96 Ga, with syn- to post-collisional magmatism and metamorphism continuing until 1.92 Ga.
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