Dislocations in naturally deformed olivine: Example of a mylonitic peridotite

Demouchy, Sylvie; Mussi, Alexandre; Weidner, Timmo; Gardés, Emmanuel; Cordier, Patrick

Document type :

Article dans une revue scientifique: Article original

DOI :

10.1016/j.pepi.2023.107125

Permalink :

http://hdl.handle.net/20.500.12210/96652

Title :

Dislocations in naturally deformed olivine: Example of a mylonitic peridotite

Author(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

Journal title :

Physics of the Earth and Planetary Interiors

Abbreviated title :

Physics of the Earth and Planetary Interiors

Volume number :

346

Pages :

107125

Publisher :

Elsevier BV

Publication date :

2023-12-07

ISSN :

0031-9201

English keyword(s) :

Olivine
Peridotite
Mylonite
Oman
Dislocation
TEM
Tomography
Melt
Bubble

HAL domain(s) :

Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]

English abstract : [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 ...
Show more >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.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

European Project :

Rheology of Earth materials: closing the gap between TIMEscales in the laboratory and in the MANtle

Administrative institution(s) :

Université de Lille
CNRS
INRAE
ENSCL

Collections :

Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Plasticité

Submission date :

2023-12-27T07:22:40Z
2024-01-17T10:25:04Z

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Version	Link	Modification date
2	20.500.12210/96652*	2024-01-17T10:15:10Z
1	20.500.12210/96652.1	2023-12-27T07:22:40Z

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Dislocations in naturally deformed olivine: ...

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