RHEOMAN

MULTISCALE MODELLING OF THE RHEOLOGY OF MANTLE MINERALS

 Coordinatore UNIVERSITE DES SCIENCES ET TECHNOLOGIES DE LILLE 

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 Nazionalità Coordinatore France [FR]
 Totale costo 2˙166˙407 €
 EC contributo 2˙166˙407 €
 Programma FP7-IDEAS-ERC
Specific programme: "Ideas" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013)
 Code Call ERC-2011-ADG_20110209
 Funding Scheme ERC-AG
 Anno di inizio 2012
 Periodo (anno-mese-giorno) 2012-05-01   -   2017-04-30

 Partecipanti

# participant  country  role  EC contrib. [€] 
1    UNIVERSITE DES SCIENCES ET TECHNOLOGIES DE LILLE

 Organization address address: Cité Scientifique Batiment A3
city: VILLENEUVE D'ASCQ
postcode: 59655

contact info
Titolo: Ms.
Nome: Martine
Cognome: Lecoutre
Email: send email
Telefono: +33 3 20337120

FR (VILLENEUVE D'ASCQ) hostInstitution 2˙166˙407.00
2    UNIVERSITE DES SCIENCES ET TECHNOLOGIES DE LILLE

 Organization address address: Cité Scientifique Batiment A3
city: VILLENEUVE D'ASCQ
postcode: 59655

contact info
Titolo: Prof.
Nome: Patrick
Cognome: Cordier
Email: send email
Telefono: +33 3 20434341

FR (VILLENEUVE D'ASCQ) hostInstitution 2˙166˙407.00

Mappa


 Word cloud

Esplora la "nuvola delle parole (Word Cloud) per avere un'idea di massima del progetto.

plastic    recently    viscosity    perovskite    mantle    earth    flow    lower    laws    model    phases    rheology    constitutive    thermal    rheological    lot    convection    their    multiscale   

 Obiettivo del progetto (Objective)

'Understanding mantle convection is essential to understand the thermal and chemical evolution of the Earth and to constrain the forces driving plate tectonics. The rheological properties of the mantle are traditionally inverted from surface geophysical data. Radial profiles of the viscosity are thus available but a lot of uncertainties remain.

A more detailed model of mantle rheology could be obtained from the knowledge of the constitutive flow laws of mantle phases. A lot of progresses have been achieved to extend the P, T range accessible to rheological studies. However, constitutive flow laws are only available so far for minerals from the upper mantle. More severe is the timescale issue since phenomenological flow laws must be extrapolated over several orders of magnitude to be applied to mantle convection.

Recently, a new field has emerged in materials science called multiscale modelling. It allows to link our understanding of a few elementary mechanisms (usually at the microscopic scale) with a behaviour observed at the macroscopic scale. I consider that this offers a ground-breaking opportunity to set a microphysics-based model of the rheology of mantle phases. Much progress has recently been obtained by my group in this direction. A multiscale model of plastic flow consist in modeling: a) the defects responsible for plastic shear at the atomic scale (dislocations); b) their mobility under the influence of stress and temperature; c) their collective behaviour resulting in plastic flow. I propose to build upon those accomplishments and to model the plastic flow of some key phases of the Earth’s mantle: wadsleyite, ringwoodite, MgSiO3 perovskite and post-perovskite to constrain: i) the viscosity contrast between the transition zone and the lower mantle; ii) the viscosity profile of the lower mantle (and understand the origin of the peak of viscosity at mid-mantle); iii) the rheology at the thermal boundary with the core.'

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