Plastic deformation and recrystallization of garnet; a mechanism to facilitate diffusion creep

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doi: 10.1093/petrology/egi067
Authors:Storey, C. D.; Prior, D. J.
Author Affiliations:Primary:
University of Leicester, Department of Geology, Leicester, United Kingdom
Other:
University of Liverpool, United Kingdom
Volume Title:Journal of Petrology
Source:Journal of Petrology, 46(12), p.2593-2613. Publisher: Oxford University Press, Oxford, United Kingdom. ISSN: 0022-3530
Publication Date:2005
Note:In English. 100 refs.; illus., incl. geol. sketch maps
Summary:Elongate and deformed garnets from Glenelg, NW Scotland occur in a thin shear zone crossing a partially retrogressed (to amphibolite facies at 700°C) eclogite. They show evolution from low-strain conditions, where dislocation creep and recovery accommodated deformation, through increasing strain where dynamic recrystallization occurred by subgrain rotation, to the highest strains, where recrystallized grains deformed by diffusion creep assisted grain boundary sliding with rotations. So garnet can deform plastically to high strains at 700°C; it can be recrystallized by subgrain rotation to form finer grained garnet; recrystallization can facilitate a change in deformation mechanisms, so diffusion-accommodated grain boundary sliding becomes important and recrystallization may assist weakening in rocks where garnet is a dominant phase, such as in the mantle transition zone. [B.E.L.]
Sections:Mineral data; Physical properties of rocks and minerals
Subsections:Metamorphic rocks
Mineral Groups:Ortho-and ring silicates
Subjects:Amphibolite facies; Creep; Deformation; Diffusion; Dislocation creep; Eclogite; Facies; Foliation; Garnet group; Mechanism; Metamorphic rocks; Metamorphism; Mineral composition; Nesosilicates; Orthosilicates; Plastic deformation; Recrystallization; Retrograde metamorphism; Silicates; Europe; Great Britain; Scotland; United Kingdom; Western Europe; Glenelg Scotland
Coordinates:N571000 N571000 W0054000 W0054000
Abstract Numbers:05M/4189
Record ID:2006036352
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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