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Modélisation thermo-mécanique de l'extension continentale : développements théoriques et applications au golfe de Corinthe (Grèce)

Abstract : How to characterize and model the parameters that control the vertical movement, heat flow, the kinematics and geometry of neoformed faults during episodes of continental rifting? To answer this question, a 2D thermomechanical explicit code was used. Derive the algorithm Flac, it can take into account the complex rheological behavior (visco-elasto-plastic) and is very effective to model the nonlinear deformation has short and medium time scales and space. However, to deal with incompressible flows, such code becomes less efficient. To overcome this problem, a finite element code (FEM 2/3D) thermomechanically couple has been developed. The impact of the inclusion of viscoelastic rheology and a free surface topography on the aplomb of a mantle plume has been able to be quantified. An implicit algorithm to include a viscoelastic rheology consistent elasto-plastic FEM in 2D code is under development. Moreover, Analog experiments were conducted in parallel 2D numerical studies in order to validate the approximation of plane strain and three-dimensional understanding of the implications of the presence of heterogeneities in the pre-rift basement. All these tools have helped to highlight, how, at different scales, the presence of several layers of different lithologies, may cause local acceleration of subsidence, the asymmetry of structures or reversals of direction of migration of deposits Centres . In terms of application, the Gulf of Corinth, an active continental rift that splits the string of Hellenides has received particular attention. Comparison of 2D numerical model (Flac) and analog 3D shows that the structural evolution from east to west and kinematics of faults in the Gulf can be explained by the presence of the slick phyllites in the series of ante-rift of the Gulf .
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  • HAL Id : tel-00589848, version 1

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Laetitia Le Pourhiet. Modélisation thermo-mécanique de l'extension continentale : développements théoriques et applications au golfe de Corinthe (Grèce). Sciences de la Terre. Université Pierre et Marie Curie - Paris VI, 2004. Français. ⟨tel-00589848⟩

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