Gutenberg Open


Personen: Piazolo, Sandra (Autor) 
Bons, P. D (Autor) 
Jessell, M. W (Autor) 
Evans, L (Autor) 
Passchier, Cornelis Willem (Autor) 
Titel: Dominance of microstructural processes and their effect on microstructural development : insights from numerical modelling of dynamic recrystallization
Quelle: Special publications : the Geological Society, London. Bd. 200. S. 149 - 170
Erscheinungsjahr:    2002
ISBN / ISSN: 0375-6440 ; 0305-8719
URL der Originalveröffentlichung doi:10.1144/GSL.SP.2001.200.01.10
Zeitschriftenaufsatz Zeitschriftenaufsatz
Sprache: Englisch
Open Access:
Person der Universität:    Passchier, Cornelis Willem  In UnivIS suchen 
Einrichtung: Institut für Geowissenschaften
DDC-Sachgruppe:    Geowissenschaften
DFG-Fachgebiet: Geologie und Paläontologie
ID: 16369  Universitätsbibliothek Mainz
Informationen zu den Nutzungsrechten unserer Inhalte Informationen zu den Nutzungsrechten unserer Inhalte
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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