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RHEOLOGY OF EARTH MATERIALS CLOSING THE GAP BETWEEN TIMESCALES IN THE LABORATOR...

RHEOLOGY OF EARTH MATERIALS CLOSING THE GAP BETWEEN TIMESCALES IN THE LABORATORY AND IN THE MANTLE Most large-scale geological process such as plate tectonics or mantle convection involve plastic deformation of rocks. With most recent developments, constraining their rheological properties at natural strain-rates is something w... ver más

28/02/2025

UNIVERSITE DE LILL...

2M€

Presupuesto del proyecto: 2M€

Líder del proyecto

UNIVERSITE DE LILLE No se ha especificado una descripción o un objeto social para esta compañía.

Fecha límite participación Sin fecha límite de participación.

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Financiación concedida El organismo H2020 notifico la concesión del proyecto el día 2025-02-28

ERC-2017-ADG: ERC Advanced Grant Scope:Objectives

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4 Participantes

UNIVERSITE DE LILLE

1.78M€ | Lider

E3T CITY

279.56K€ | Participante

UANTWERPEN

515.00K€ | Participante

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Duración del proyecto: 78 meses Fecha Inicio: 2018-07-30
Fecha Fin: 2025-02-28

Líder del proyecto

UNIVERSITE DE LILLE No se ha especificado una descripción o un objeto social para esta compañía.

Presupuesto del proyecto 2M€

Fecha límite de participación Sin fecha límite de participación.

Descripción del proyecto Most large-scale geological process such as plate tectonics or mantle convection involve plastic deformation of rocks. With most recent developments, constraining their rheological properties at natural strain-rates is something we can really achieve in the decade to come. Presently, these theological properties are described with empirical equations which are fitted on macroscopic, average properties, obtained in laboratory experiments performed at human timescales. Their extrapolation to Earth’s conditions over several orders of magnitude is highly questionable as demonstrated by recent comparison with surface geophysical observables. Strain rates couple space and time. We cannot expand time, but we can now reduce length scales. By using the new generation of nanomechanical testing machines in transmission electron microscopes, we can have access to elementary deformation mechanisms and, more importantly, we can measure the key physical parameters which control their dynamics. At this scale, we can have access to very slow mechanisms which were previously out of reach. This approach can be complemented by numerical modelling. By using the recent developments in modelling the so-called rare events, we will be able to model mechanisms in the same timescales as nanomechanical testing. By combining, nanomechanical testing and advanced numerical modelling of elementary processes I propose to elaborate a new generation of rheological laws, based on the physics of deformation, which will explicitly involve time (i.e. strain rate) and will require no extrapolation to be applied to natural processes. Applied to olivine, the main constituent of the upper mantle, this will provide the first robust, physics-based rheological laws for the lithospheric and asthenospheric mantle to be compared with surface observables and incorporated in geophysical convection models.

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