Titre :

Deformation of subduction zones multiphase rocks: in situ, high pressure experiments

Auteur(s) :

Hilairet, Nadege [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Mandolini, Tommaso [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Merkel, Sébastien [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Tomé, Carlos [Auteur]
Los Alamos National Laboratory [LANL]
Chantel, Julien [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Guignard, Jeremy [Auteur]
European Synchrotron Radiation Facility [ESRF]
Institut de recherche en astrophysique et planétologie [IRAP]
Crichton, Wilson [Auteur]
European Synchrotron Radiation Facility [ESRF]
Le Godec, Yann [Auteur]
Institut de minéralogie, de physique des matériaux et de cosmochimie [IMPMC]
Sorbonne Université [SU]

Titre de la manifestation scientifique :

17th International Symposium on Experimental Mineralogy, Petrology and Geochemistry (EMPG-XVII)

Organisateur(s) de la manifestation scientifique :

University of Potsdam
GFZ German Research Centre for Geosciences
Helmholtz Centre Potsdam

Ville :

Online event

Pays :

Allemagne

Date de début de la manifestation scientifique :

2021-03-01

Discipline(s) HAL :

Chimie/Matériaux
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Physique [physics]/Physique [physics]/Géophysique [physics.geo-ph]
Physique [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Sciences de la Terre

Résumé en anglais : [en]

Rocks are polymineralic crystalline aggregates. Quantifying and understanding their mechanical behavior remains a challenge because multiple feedbacks are at play in crystalline aggregates between parameters such as ...
Lire la suite >Rocks are polymineralic crystalline aggregates. Quantifying and understanding their mechanical behavior remains a challenge because multiple feedbacks are at play in crystalline aggregates between parameters such as temperature (T), pressure (P) and characteristics such as grain sizes and microstructure. In addition, natural observations and many works emphasize that in polymineralic rocks, heterogeneities in minerals’ mechanical properties induce stress and strain partitioning with dramatic consequences for the global mechanical behaviour. A common approach in rheological studies under high pressures is to investigate monomineralic aggregates as a proxy, and the mineralogical diversity of deep subduction zones aggregates seldom has been considered. Here, I will present how HP deformation experiments with in-situ x-ray measurements and mean field models of polymineralic aggregates can help us with this problem. Questions that can be answered include sorting out which phases are susceptible to control the aggregate behavior and for which mineralogy. To that extent, we investigate the strain (rate) or stress ranges in the rock that can exist due to different elastic and plastic properties of minerals. The microstructural characteristics, part of which can be monitored in-situ, remain crucial when considering these questions. I will illustrate the presentation with high-pressure experiments using in-situ X-Ray measurements, mean field models of aggregates, and our current effort using HP tomography on deformed subduction zones rocks.Lire moins >

Langue :

Anglais

Comité de lecture :

Non

Audience :

Internationale

Vulgarisation :

Non

Projet ANR :

Deformation des roches multiphasées des zones de subduction

Établissement(s) :

Université de Lille
CNRS
INRA
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Équipe(s) de recherche :

Matériaux Terrestres et Planétaires

Date de dépôt :

2021-03-08T16:30:02Z
2021-03-09T17:23:37Z