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Journal of Petrology Advance Access first published online on August 1, 2005
This version published online on August 18, 2005
Journal of Petrology, doi:10.1093/petrology/egi067
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oupjournals.org
Received September 27, 2004
Accepted June 28, 2005

Article

Plastic Deformation and Recrystallization of Garnet: A Mechanism to Facilitate Diffusion Creep

C. D. STOREY 1 and D. J. PRIOR 2*

1 DEPARTMENT OF GEOLOGY, UNIVERSITY OF LEICESTER, UNIVERSITY ROAD, LEICESTER LE1 7RH, UK; Present address: Department of Earth Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
2 DEPARTMENT OF EARTH AND OCEAN SCIENCES, UNIVERSITY OF LIVERPOOL, LIVERPOOL L69 3GP, UK

* To whom correspondence should be addressed.
D. J. PRIOR, E-mail: davep{at}liv.ac.uk


  Abstract

Elongate and deformed garnets from Glenelg, NW Scotland, occur within a thin shear zone transecting an eclogite body that has undergone partial retrogression to amphibolite facies at circa 700°C. Optical microscopy, back-scattered electron imaging, electron probe microanalysis and electron back-scatter diffraction reveal garnet substructures that are developed as a function of strain. Subgrains with low-angle misorientation boundaries occur at low strain and garnet orientations are dispersed, around rational crystallographic axes, across these boundaries. Towards high-strain areas, boundary misorientations increase and there is a loss of crystallographic control on misorientations, which tend towards random. In high-strain areas, a polygonal garnet microstructure is developed. The garnet orientations are randomly dispersed around the original single-crystal orientation. Some garnet grains are elongate and Ca-rich garnet occurs on the faces of elongate grains oriented normal to the foliation. Commonly, the garnet grains are admixed with matrix minerals, and, where in contact with other phases, garnet is well faceted. We suggest that individual garnet porphyroclasts record an evolution from low-strain conditions, where dislocation creep and recovery accommodated deformation, through increasing strain, where dynamic recrystallization occurred by subgrain rotation, to highest strains, where recrystallized grains were able to deform by diffusion creep assisted grain boundary sliding with associated rotations.

Keywords: diffusion creep; EBSD; garnet; plastic deformation; recrystallization.
The following items in this paper have been updated: On pages 8 and 13, the word "dextral" has been replaced with the word "sinistral".
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M. Konrad-Schmolke, P. J. O'Brien, and F. Heidelbach
Compositional re-equilibration of garnet: the importance of sub-grain boundaries
European Journal of Mineralogy, July 1, 2007; 19(4): 431 - 438.
[Abstract] [Full Text] [PDF]


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