Affordable Access

Access to the full text

The Athabasca Granulite Terrane and Evidence for Dynamic Behavior of Lower Continental Crust

Authors
  • Dumond, Gregory
  • Williams, Michael L.
  • Regan, Sean P.
Type
Published Article
Journal
Annual Review of Earth and Planetary Sciences
Publisher
Annual Reviews
Publication Date
May 30, 2018
Volume
46
Pages
353–386
Identifiers
DOI: 10.1146/annurev-earth-063016-020625
Source
Annual Reviews
Keywords
License
Yellow

Abstract

Deeply exhumed granulite terranes have long been considered nonrepresentative of lower continental crust largely because their bulk compositions do not match the lower crustal xenolith record. A paradigm shift in our understanding of deep crust has since occurred with new evidence for a more felsic and compositionally heterogeneous lower crust than previously recognized. The >20,000-km2 Athabasca granulite terrane locally provides a >700-Myr-old window into this type of lower crust, prior to being exhumed and uplifted to the surface between 1.9 and 1.7 Ga. We review over 20 years of research on this terrane with an emphasis on what these findings may tell us about the origin and behavior of lower continental crust, in general, in addition to placing constraints on the tectonic evolution of the western Canadian Shield between 2.6 and 1.7 Ga. The results reveal a dynamic lower continental crust that evolved compositionally and rheologically with time.

Report this publication

Statistics

Seen <100 times