Dislocations in naturally deformed olivine: ...
Type de document :
Article dans une revue scientifique: Article original
URL permanente :
Titre :
Dislocations in naturally deformed olivine: Example of a mylonitic peridotite
Auteur(s) :
Demouchy, Sylvie [Auteur]
Laboratoire Magmas et Volcans [LMV]
Géosciences Montpellier
Mussi, Alexandre [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Weidner, Timmo [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Gardés, Emmanuel [Auteur]
Laboratoire Magmas et Volcans [LMV]
Cordier, Patrick [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Laboratoire Magmas et Volcans [LMV]
Géosciences Montpellier
Mussi, Alexandre [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Weidner, Timmo [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Gardés, Emmanuel [Auteur]
Laboratoire Magmas et Volcans [LMV]
Cordier, Patrick [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Titre de la revue :
Physics of the Earth and Planetary Interiors
Nom court de la revue :
Physics of the Earth and Planetary Interiors
Numéro :
346
Pagination :
107125
Éditeur :
Elsevier BV
Date de publication :
2023-12-07
ISSN :
0031-9201
Mot(s)-clé(s) en anglais :
Olivine
Peridotite
Mylonite
Oman
Dislocation
TEM
Tomography
Melt
Bubble
Peridotite
Mylonite
Oman
Dislocation
TEM
Tomography
Melt
Bubble
Discipline(s) HAL :
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Résumé en anglais : [en]
We have investigated the microstructure of naturally deformed olivine (chemically equilibrated at 1000 °C) by conventional transmission electron microscopy and electron tomography. The peridotite specimen, from Oman ...
Lire la suite >We have investigated the microstructure of naturally deformed olivine (chemically equilibrated at 1000 °C) by conventional transmission electron microscopy and electron tomography. The peridotite specimen, from Oman ophiolite, has a mylonitic microstructure with remnant, strongly deformed, millimetric porphyroclasts co-existing with small newly formed olivine grains generated by dynamic recrystallization. Imaging by transmission electron microscopy reveals that both newly formed grains and porphyroclasts display [100] and [001] dislocations activity. Subgrain boundaries are composed of either [100] or [001] dislocations. The characterization of this natural sample also permits to identify sporadic [100] dislocation loops, rare [010] dislocation, infrequent melt, and intragranular bubble arrays or along subgrain boundaries. Electron tomography permits to identify several glide planes, which are similar to previous observations acquired on experimentally deformed polycrystalline olivine, but more importantly electron tomography also permits to evidence combination of glide, climb and mixed climb. Our study further infers the diversity of linear defects responsible for plastic deformation of olivine at lithospheric conditions.Lire moins >
Lire la suite >We have investigated the microstructure of naturally deformed olivine (chemically equilibrated at 1000 °C) by conventional transmission electron microscopy and electron tomography. The peridotite specimen, from Oman ophiolite, has a mylonitic microstructure with remnant, strongly deformed, millimetric porphyroclasts co-existing with small newly formed olivine grains generated by dynamic recrystallization. Imaging by transmission electron microscopy reveals that both newly formed grains and porphyroclasts display [100] and [001] dislocations activity. Subgrain boundaries are composed of either [100] or [001] dislocations. The characterization of this natural sample also permits to identify sporadic [100] dislocation loops, rare [010] dislocation, infrequent melt, and intragranular bubble arrays or along subgrain boundaries. Electron tomography permits to identify several glide planes, which are similar to previous observations acquired on experimentally deformed polycrystalline olivine, but more importantly electron tomography also permits to evidence combination of glide, climb and mixed climb. Our study further infers the diversity of linear defects responsible for plastic deformation of olivine at lithospheric conditions.Lire moins >
Langue :
Anglais
Comité de lecture :
Oui
Audience :
Internationale
Vulgarisation :
Non
Projet Européen :
Établissement(s) :
Université de Lille
CNRS
INRAE
ENSCL
CNRS
INRAE
ENSCL
Collections :
Équipe(s) de recherche :
Plasticité
Date de dépôt :
2023-12-27T07:22:40Z
2024-01-17T10:25:04Z
2024-01-17T10:25:04Z
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