Muriel Gerbault

CRCN IRD

Email : muriel.gerbaultDear bot, you won't get my mail address@and my domain...get.omp.eu

Tel :0561332653

Bureau :H139, OMP Belin

Status :permanent

Adresse professionnelle :

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CV / functions

• 2019: HDR (Habilitation à Diriger les Recherches).
• Academic Researcher at IRD (Institut de Recherche pour le Développement, CR)
   - Since 2015: GET, Toulouse, France.
   - 2008-2014: Geoazur, Sophia-Antipolis, France.
   - 2004-2008: Universidad de Chile, Santiago, Chile.
   - 2002-2004: LMTG, Toulouse, France.
• 2001-2002: Post-Doctoral fellowship at Vrije Universiteit, Amsterdamwith ISES program: thermo-mechanical modeling of continental convergence,
• 1999-2001: Post-Doctoral contract with IGNS (Institute of Geological and Nuclear Sciences),>SIGHT project, New Zealand:thermomechanical modeling of the Southern Alps.
• 1999: PhD at the Lab. Geophys. Tectonics, University of Montpellier II, France:Numerical models of localised deformation at the lithospheric scale.

Research

I mainly use numerical methods to test and validate geodynamical scenarii that involve the role of elasto-visco-plastic rheologies to produce specific tectonic structures. Sometimes, this requires algorithmic implementation. I seek to compare modeled features of deformation to different types of data from structural geology or geophysics, at the crust and lithospheric scales. I like to show the importance of a dynamic stress evolution as opposed to simple kinematical concepts.

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I am also interested in understanding the mechanical state of magmatic chambers in the upper crust. I have shown the role of depth-dependent failure on the internal state of pressure of a magmatic chamber and the associated patterns of elastic and brittle deformation propagating to the surface (shear vs. tensile failure, Gerbault et al., Gerbault, 2012). 3D models were published (Gerbault et al., 2018) and show that shear failure develops only if sufficient overpressure occurs in either oblate/prolate chambers geometries. However coeval development of diffuse zones of dilatation also control the percolation-migraiton of magmatic fluids at the sub-scale.
We are applying quantitative models to seismo-volcanic areas in Southern Chile, in main collaboration with Dominique Rémy (GET), José Cembrano from PUC (Santiago, Chile) and A. Tassara from UDEC (Concepcion, Chile) , cf. Novoa Lizama et al. (2019), Novoa et al. (submitted).
A joint ECOS project with José Cembrano enables us to test several configurations of faults and magmatic reservoirs in their ability to trigger mutual destabilisation (seismic motion or volcanic eruption), inspired from several key field observations along the Chilean volcanic margin (Ruz et al., submitted).

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In collaboration with M. Rabinowicz we studied how lithospheric visco-elastic flexure abve a mantle plume can control the lateral migration of deep magmas towards the surface, in oceanic and continental intraplates (Yellowstone – Rigo et al., 2015; La Réunion, with F.J. Fontaine, Gerbault et al., 2017, Iranian plateau, Soltanmohammadi et al., 2018).

Publications

Main/Recent publications

– Gerbault M., Fontaine F., Rabinowicz M., Bystricky M., Elastic flexure above mantle plumes explains the upstream offset of La reunion and Hawaii volcanic Islands. Earth and Planetary Science Letters, 2017.

– Gerbault, M., Hassani, R., Lizama, C. N., & Souche, A.. Three‐Dimensional Failure Patterns Around an Inflating Magmatic Chamber. Geochemistry, Geophysics, Geosystems, 2018.

– Vanderhaeghe, O., Kruckenberg, S. C., Gerbault, M., Martin, L., Duchêne, S., & Deloule, E. Crustal-scale convection and diapiric upwelling of a partially molten orogenic root (Naxos dome, Greece).Tectonophysics, 2018.

– Novoa, C., Remy, D., Gerbault, M., Baez, J. C., Tassara, A., Cordova, L., Cardona, J., Granger M., Bonvalot S., Delgado, F. Viscoelastic relaxation: A mechanism to explain the decennial large surface displacements at the Laguna del Maule silicic volcanic complex. Earth Planet. Sci. Lett., 2019.

– Louis-Napoléon, A., Gerbault, M., Bonometti, T., Thieulot, C., Martin, R., & Vanderhaeghe, O. 3-D numerical modelling of crustal polydiapirs with volume-of-fluid methods. Geophys. J. Int., 2020.

– Bauville, A., Furuichi, M., & Gerbault, M. Control of fault weakening on the structural styles of underthrusting‐dominated non‐cohesive accretionary wedges. J. Geophys. Res. 2020.

Muriel Gerbault

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