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One of the most striking features of the western Canadian shield
is the Snowbird tectonic zone (STZ). This NE trending structural
discontinuity is the 2800 km-long boundary between the Rae and
Hearne crustal provinces and is marked by dramatic gravity and
magnetic anomalies and gradients. The Striding-Athabasca (S-A)
mylonite zone is a well-exposed 400 km-long segment in northern
Saskatchewan and the Northwest Territories. This region contains
an extensive domain of the highest pressure rocks known in the
Canadian Shield (~1.5-2.0 GPa) and one of the world's oldest
exposures of eclogite. The S-A mylonite zone is particularly
well exposed in the East Athabasca mylonite triangle (EAmt),
a 40-km-wide, northeast-tapering zone of granulite facies mylonites
in northern Saskatchewan. These extraordinary rocks provide
a unique view of cratonic deep crust that is allowing us to
gain insight into lower crustal and upper mantle magmatic, metamorphic,
and deformational processes.
We
use integrated structural, petrological, geochronological, and
thermochronological techniques and have a number of active research
projects along different parts of the Snowbird tectonic zone:
- The
East Athabasca mylonite triangle - Michael
Williams, Kevin Mahan, Chris Kopf
- Wholdaia
Lake region of the STZ in the NW Territories - Lori
Krikorian
- Legs
Lake shear zone (bounds EAmt) - Kevin
Mahan
- Neil
Bay (southern Rae Domain) - Chris
Kopf, Michael Williams
- Daly
Bay (northern Rae Domain)
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Cora
Lake mylonite, East Lake Athabaska, Saskatchewan
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