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Dominance of microstructural processes and their effect on microstructural development: Insights from numerical modelling of dynamic recrystallization

By
S. Piazolo
S. Piazolo
Johannes Gutenberg-Universität, Institut für Geowissenschaften, FB 22, Becherweg 21, 55099 Mainz, GermanyGEUS, Thoravej 8, 2400 Copenhagen NV, Denmark
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P. D. Bons
P. D. Bons
Johannes Gutenberg-Universität, Institut für Geowissenschaften, FB 22, Becherweg 21, 55099 Mainz, GermanyEpsilon Laboratory, School of Earth Sciences, P.O. Box 28E, Monash University, Victoria, 3800, AustraliaInstiut für Geowissenschaften, Eberhard Karls Universität, Sigwartstrasse 10, 72076 Tübingen, Germany
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M. W. Jessell
M. W. Jessell
Epsilon Laboratory, School of Earth Sciences, P.O. Box 28E, Monash University, Victoria, 3800, Australia
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L. Evans
L. Evans
Epsilon Laboratory, School of Earth Sciences, P.O. Box 28E, Monash University, Victoria, 3800, Australia
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C. W. Passchier
C. W. Passchier
Johannes Gutenberg-Universität, Institut für Geowissenschaften, FB 22, Becherweg 21, 55099 Mainz, Germany
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Published:
January 01, 2002

Abstract

The influence of the dominance of different processes on the microstructural development of a quartzite was investigated using the numerical model ‘ELLE’. Dynamic recrystallization of a polycrystalline aggregate was simulated by the concurrent operation of viscous deformation, lattice rotation, subgrain formation, rotational recrystallization, nucleation of new grains from strongly strained grains and recovery. The different observed microstructural characteristics depend on the relative rates at which grain boundary migration, subgrain formation, recrystallization by rotation and nucleation affect the microstructure. Observed sizes of recrystallized grains are significantly influenced by these different relative rates of processes. These rates are determined by parameters that mainly depend on temperature, fluid absence or presence, shear stress and strain rate. Therefore, the specific conditions at which deformation took place have to be taken into account if recrystallized grain sizes are used for palaeopiezometry. Comparison and combination of our results with experimental data and observations in natural examples provide the possibility of interpreting microstructures quantitatively in terms of temperature and shear strain rate.

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Contents

Geological Society, London, Special Publications

Deformation Mechanisms, Rheology and Tectonics: Current Status and Future Perspectives

S. de Meer
S. de Meer
Utrecht University, The Netherlands
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M. R. Drury
M. R. Drury
Utrecht University, The Netherlands
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J. H. P. de Bresser
J. H. P. de Bresser
Utrecht University, The Netherlands
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G. M. Pennock
G. M. Pennock
Utrecht University, The Netherlands
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Geological Society of London
Volume
200
ISBN electronic:
9781862396081
Publication date:
January 01, 2002

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