Striding-Athabasca mylonite zone; complex Archean deep-crustal deformation in the East Athabasca mylonite triangle, northern Saskatchewan

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doi: 10.1139/e94-111
Authors:Hanmer, Simon; Parrish, Randy; Williams, Michael; Kopf, Chris
Author Affiliations:Primary:
Geological Survey of Canada, Continental Geoscience Division, Ottawa, ON, Canada
University of Massachusetts, United States
Volume Title:Canadian Journal of Earth Sciences Revue Canadienne des Sciences de la Terre
Source:Canadian Journal of Earth Sciences = Revue Canadienne des Sciences de la Terre, 31(8), p.1287-1300. Publisher: National Research Council of Canada, Ottawa, ON, Canada. ISSN: 0008-4077
Publication Date:1994
Note:In English with French summary. Geol. Surv. Can., Contrib. No. 26794. 47 refs.; illus., incl. 1 table, geol. sketch maps
Summary:In this triangle, mid-Archaean annealed mylonites and late Archaean ribbon mylonites were formed during two granulite-facies events (850-1000°C, 1.0 GPa). The late Archaean mylonites are divided into an upper structural deck, entirely occupied by a dip-slip shear zone, and an underlying lower deck. In the interval ∼ 2620-2600 m.y., deformation in the upper and lower decks evolved from a granulite-facies pervasive regime to a more localized amphibolite-facies regime. With further cooling, deformation was localized within very narrow greenschist mylonitic faults at the lateral limits of the lower deck. By the late Archaean, the East Athabasca mylonite triangle was part of a deep-crustal, intracontinental shear zone. [R.A.H.]
Subjects:Absolute age; Amphibolite facies; Archean; Continental crust; Crust; Dates; Deformation; Facies; Faults; Granulite facies; Gravity anomalies; Kinematics; Lower crust; Metamorphic rocks; Mylonites; Nesosilicates; Orthosilicates; Precambrian; Shear zones; Silicates; Strike-slip faults; Structural analysis; Tectonic elements; U/Pb; Zircon; Zircon group; Athabasca District; Canada; Canadian Shield; Churchill Province; North America; Saskatchewan; Snowbird tectonic zone; Western Canada; East Athabasca mylonite triangle; Northern Saskatchewan; Striding-Athabasca mylonite zone
Abstract Numbers:95M/2388
Record ID:1995001902
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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