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Brittle plus plastic deformation of gypsum aggregates experimentally deformed in torsion to high strains: quantitative microstructural and texture analysis from optical and diffraction data

M. Zucali, V. Barberini, D. Chateigner, B. Ouladdiaf and L. Lutterotti
Geological Society, London, Special Publications, 332, 79-98, 1 January 2010, https://doi.org/10.1144/SP332.6
M. Zucali
1Dipartimento di Scienze della Terra ‘Ardito Desio’, Università degli Studi di Milano, Via Mangiagalli 34, 20133 Milano, Italy
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  • For correspondence: [email protected]
V. Barberini
2Dipartimento di Scienze Geologiche e Geotecnologie, Università degli Studi di Milano-Bicocca, Piazza della Scienza 4, 20126 Milano, Italy
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D. Chateigner
3Laboratoire de Cristallographie et Sciences des Matériaux (CRISMAT), Ecole Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Université de Caen Basse-Normandie, 6 Bd M. Juin, 14050 Caen, France
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B. Ouladdiaf
4Institut Laue-Langevin, BP 156, 6 rue Jules Horowitz, 38042 Grénoble Cedex 9, France
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L. Lutterotti
5Department of Materials Engineering, Engineering Faculty, University of Trento, Via Mesiano, 77, I-38100 Povo-Trento, Italy
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Abstract

This contribution presents a quantitative microstructural analysis of a polycrystalline aggregate of gypsum, deformed in torsion (T=70–90 °C) at γ (shear strain) ranging from 0 to 4.82. Quantitative microstructural analysis is used to compare the evolution of microstructures observed by optical microscope with those obtained from analysis of X-ray and neutron diffraction data. This analysis shows that during experimental deformation, gypsum accommodated strain by brittle and plastic deformation mechanisms, developing Riedel-like microfaults with plastic foliations and crystallographic preferred orientation (CPO). The relations of microstructures show that with increasing strain, the Riedel systems start from R planes with an angle of ≈30° to the Imposed Shear Plane. This angle decreases (5°–15°) when strain increases, and Y planes develop. Quantitative texture analysis (QTA) shows that S-foliations start developing at low γ and maintain their orientation up to high γ, and that the most active slip system is the (010) along normal to (100) and the [001]-axis. Shape preferred orientation (SPO) of gypsum does not coincide with the theoretical orientation as it does not decrease with increasing strain. This discrepancy is explained by the role of the brittle shear planes that impose a back rotation to gypsum. No brittle to plastic transition occurs. But both plastic and brittle structures contemporaneously accommodate and localize strain.

  • © The Geological Society of London 2010
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Geological Society, London, Special Publications: 332 (1)
Geological Society, London, Special Publications
Volume 332
2010
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Brittle plus plastic deformation of gypsum aggregates experimentally deformed in torsion to high strains: quantitative microstructural and texture analysis from optical and diffraction data

M. Zucali, V. Barberini, D. Chateigner, B. Ouladdiaf and L. Lutterotti
Geological Society, London, Special Publications, 332, 79-98, 1 January 2010, https://doi.org/10.1144/SP332.6
M. Zucali
1Dipartimento di Scienze della Terra ‘Ardito Desio’, Università degli Studi di Milano, Via Mangiagalli 34, 20133 Milano, Italy
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: [email protected]
V. Barberini
2Dipartimento di Scienze Geologiche e Geotecnologie, Università degli Studi di Milano-Bicocca, Piazza della Scienza 4, 20126 Milano, Italy
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
D. Chateigner
3Laboratoire de Cristallographie et Sciences des Matériaux (CRISMAT), Ecole Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Université de Caen Basse-Normandie, 6 Bd M. Juin, 14050 Caen, France
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
B. Ouladdiaf
4Institut Laue-Langevin, BP 156, 6 rue Jules Horowitz, 38042 Grénoble Cedex 9, France
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  • Search for this author on this site
L. Lutterotti
5Department of Materials Engineering, Engineering Faculty, University of Trento, Via Mesiano, 77, I-38100 Povo-Trento, Italy
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  • Find this author on PubMed
  • Search for this author on this site

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Brittle plus plastic deformation of gypsum aggregates experimentally deformed in torsion to high strains: quantitative microstructural and texture analysis from optical and diffraction data

M. Zucali, V. Barberini, D. Chateigner, B. Ouladdiaf and L. Lutterotti
Geological Society, London, Special Publications, 332, 79-98, 1 January 2010, https://doi.org/10.1144/SP332.6
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