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OSUG - Terre Univers Environnement OSUG

Séminaire du Jeudi 15 Novembre 2012

Convection of Venus and Enceladus, two regimes, one model

Antoine Rozel (Univ. Roma)
Thursday 15 November - 11 h 00
Salle Manuel Forestini - IPAG

The charaterization of the surface of Venus indicates an homogeneous age of 500 to 700 Myrs. This observation suggests that the lithosphere of the planet may have experienced a catastrophic overturn after a sudden lithosphere distabilisation. The mechanisms involved in this event are still largely misunderstood. Enceladus, an icy satellite of Saturn, presents a very important heat flux in its south pole. Though some significant heating may be explained by tidal dissipation, no model has been able to explain this observation in a self-consistent way. I will present a new thermodynamical model of dynamic recrystallization applied to both the rheology of ice and peridotite which allows me to propose a fully self-consistent explanation for these two mysterious convection regimes in a large range of parameters. A brief presentation of various projects will follow : detection of surface craterisation and mineralogy applied to Mars (using neural networks) and a new formalism of adaptive mesh refinement, easily parallelisable.


Sous la tutelle de:

tutelles

Sous la tutelle de:

CNRS Université Grenoble Alpes