Title :

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

Author(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]

Conference title :

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

Conference organizers(s) :

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

City :

Online event

Country :

Allemagne

Start date of the conference :

2021-03-01

HAL domain(s) :

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

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

Language :

Anglais

Peer reviewed article :

Non

Audience :

Internationale

Popular science :

Non

ANR Project :

Deformation des roches multiphasées des zones de subduction

Administrative institution(s) :

Université de Lille
CNRS
INRA
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Matériaux Terrestres et Planétaires

Submission date :

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