Snowbird/Athabasca granulite terrane

The Snowbird Tectonic Zone (STZ) is a ca. 2800 km geophysically defined lineament that bisects the western Churchill Province, divided it into the northwestern Rae and southeastern Hearne domain (or subprovinces).  The easternmost Rae domain is underlain by an extensive (>20,000 km2) area of high P granulite interpreted to be representative of lower continental crust.


Localization within the Lower continental crust: timing and significance of the Cora Lake shear zone

Regan et al., 2014

Evolution of lower crustal behaviour (Dumond et al., in press)

Williams et al., 2014

Leslie et al., 2015

Age and petrogenesis of the Chipman-Kazan composite dike swarm (SK, NWT, and Nunavut)

Archean plutonism along the eastern Rae domain (Regan et al., 2017a,b)

Archean tectonism within the lower continental crust

Regan et al., 2017a

Age and tectonic significance of the Snowbird Tectonic Zone

Transect diagram
Existing geochronology and sample locations for paired U-Th-Pb and Hf analyses in zircon showing no major changes across the Snowbird Tectonic Zone with respect to 2.60 Ga plutonic rocks.  These data demonstrate that the Rae and Hearne domains were likely together at 2.60 Ga.

Regan et al., 2017b

Spatial and temporal evolution of the Angikuni Lake Region, Nunavut

Angikuni lake
Simplified geologic map of the Angikuni Lake Regaion from Aspler et al., 1999