Periclase deforms more slowly than bridgmanite under mantle conditions

Cordier, Patrick; Gouriet, Karine; Weidner, Timmo; Van Orman, James; Castelnau, Olivier; Jackson, Jennifer M.; Carrez, Philippe

Type de document :

Article dans une revue scientifique: Article original

DOI :

10.1038/s41586-022-05410-9

URL permanente :

http://hdl.handle.net/20.500.12210/79032

Titre :

Periclase deforms more slowly than bridgmanite under mantle conditions

Auteur(s) :

Cordier, Patrick [Auteur]

Unité Matériaux et Transformations (UMET) - UMR 8207
Gouriet, Karine [Auteur]

Unité Matériaux et Transformations (UMET) - UMR 8207
Weidner, Timmo [Auteur]
Van Orman, James [Auteur]
Castelnau, Olivier [Auteur]
Jackson, Jennifer M. [Auteur]
Carrez, Philippe [Auteur]

Unité Matériaux et Transformations (UMET) - UMR 8207

Titre de la revue :

Nature

Nom court de la revue :

Nature

Numéro :

613

Pagination :

303-307

Éditeur :

Springer Science and Business Media LLC

Date de publication :

2023-01-11

Résumé en anglais : [en]

Transport of heat from the interior of the Earth drives convection in the mantle, which involves the deformation of solid rocks over billions of years. The lower mantle of the Earth is mostly composed of iron-bearing ...
Lire la suite >Transport of heat from the interior of the Earth drives convection in the mantle, which involves the deformation of solid rocks over billions of years. The lower mantle of the Earth is mostly composed of iron-bearing bridgmanite MgSiO3 and approximately 25% volume periclase MgO (also with some iron). It is commonly accepted that ferropericlase is weaker than bridgmanite1. Considerable progress has been made in recent years to study assemblages representative of the lower mantle under the relevant pressure and temperature conditions2,3. However, the natural strain rates are 8 to 10 orders of magnitude lower than in the laboratory, and are still inaccessible to us. Once the deformation mechanisms of rocks and their constituent minerals have been identified, it is possible to overcome this limitation thanks to multiscale numerical modelling, and to determine rheological properties for inaccessible strain rates. In this work we use 2.5-dimensional dislocation dynamics to model the low-stress creep of MgO periclase at lower mantle pressures and temperatures. We show that periclase deforms very slowly under these conditions, in particular, much more slowly than bridgmanite deforming by pure climb creep. This is due to slow diffusion of oxygen in periclase under pressure. In the assemblage, this secondary phase hardly participates in the deformation, so that the rheology of the lower mantle is very well described by that of bridgmanite. Our results show that drastic changes in deformation mechanisms can occur as a function of the strain rate.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Non spécifiée

Projet Européen :

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

Établissement(s) :

Université de Lille
CNRS
INRAE
ENSCL

Collections :

Unité Matériaux et Transformations (UMET) - UMR 8207

Équipe(s) de recherche :

Plasticité

Date de dépôt :

2023-01-13T11:47:00Z

Fichiers

Cordier-et-al(2023)PericlaseLowerMantle.pdf
Version éditeur
Accès libre
Accéder au document

Historique des modifications

Numéro de version	Lien	Date de modification
5	20.500.12210/79032	2023-01-18T10:04:36Z
4	20.500.12210/79032.4	2023-01-18T09:30:22Z
3	20.500.12210/79032.3	2023-01-16T09:31:58Z
2	20.500.12210/79032.2	2023-01-13T12:13:18Z
1	20.500.12210/79032.1*	2023-01-13T11:47:00Z

*Version sélectionnée

Periclase deforms more slowly than bridgmanite ...

BibTeX

CSV

Excel

RIS

Fichiers

Information

Historique des modifications

Periclase deforms more slowly than bridgmanite ... BibTeX CSV Excel RIS

Fichiers

Information

Historique des modifications

Periclase deforms more slowly than bridgmanite ...

BibTeX

CSV

Excel

RIS