Shear zone reactivation at granulite facies; the importance of plutons in the localization of viscous flow

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doi: 10.1144/gsjgs.154.1.0111
Authors:Hanmer, Simon
Author Affiliations:Primary:
Geological Survey of Canada, Ottawa, ON, Canada
Other:
University of Durham, United Kingdom
Volume Title:role of basement reactivation in continental deformation
Volume Authors:Butler, R. W. H., editor; Holdsworth, R. E.; Lloyd, G. E.
Source:Journal of the Geological Society of London, Vol.154 (Part 1), p.111-116; Discussion meeting on The role of basement reactivation in continental deformation, Burlington House, United Kingdom, March 6-7, 1996, edited by R. W. H. Butler, R. E. Holdsworth and G. E. Lloyd. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:1997
Note:In English. 50 refs.; illus., incl. geol. sketch map
Summary:The localization of flow in natural quartzofeldspathic shear zones at granulite-facies T does not occur purely by dislocation creep and dynamic recrystallization. From a review of the great Slave Lake shear zone and the Striding-Athabasca mylonite zone in the Canadian Shield, initial faulting was focused along a pre-existing shear zone, and/or the boundary of a volume of relatively strong crust or lithosphere, and guided emplacement of hot mantle-derived melts into the base of the crust, leading to extensive melting. When crystallized, the sub-solidus plutons represent a focused zone of thermally softened material, capable of deforming readily and developing the full range of crystal-plastic microstructures and fabrics associated with mylonite, contrasting with the intrusion-free wall rocks. [R.A.H.]
Subjects:Deformation; Fabric; Facies; Faults; Granulite facies; Granulites; Intrusions; Localization; Metamorphic rocks; Plutons; Reactivation; Shear zones; Canadian Shield; North America; Great Slave Lake shear zone; Striding-Athabasca mylonite zone; Viscous flow
Abstract Numbers:97M/3010
Record ID:1997056633
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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