Anthony JOURDON

Influence of passive margins maturity on mountain belts evolution

Supervisors:
Frédéric Mouthereau (GET) and Laëtitia Le Pourhiet (ISTeP)

Major Results

Hot geotherm during inversion leads to (1) Obduction for oceanic domains larger than 50-70 km or (2) continental collision for oceanic domains smaller than 50 km.
The thickness of the salt layer influences the timing of crustal deformation during collision.
3D models show that obliquity influences the mode of propagation of oceanic v-shaped propagators and strain localization in continental rift.

Abstract

The influence of inherited structures and lithosphere rheology is of first order importance regarding strain localization and geodynamic evolution of geological systems. In the scope of the Orogen project we investigated the role of passive margins tectonic and thermal structuration on mountain building through 2D thermo-mechanical numerical models.

Our work mainly focused on the width of the exhumed mantle domain and its role during mountain building and on the influence of a weak pre-rift salt layer on the strain localization at crustal scale.
In a second part we focused on 3D numerical modelling about V-shaped oceanic propagators and the effect of obliquity on ridge to rift propagation and strain localization.

Modes of Propagation of Continental breakup and associated oblique rift structures.

Jourdon, A., Le Pourhiet, L., Mouthereau, F., May, D. (2020). Modes of Propagation of Continental breakup and associated oblique rift structures. Journal of Geophysical Research: Solid Earth, 125.

keywords: Geodynamics, Ridge propagation, Plate tectonics, 3D thermo‐mechanical, numerical modelling, Transform margins, Oceanic propagators

DOI: https://doi.org/10.1029/2020JB019906

Topographic and tectonic evolution of mountain belts controlled by salt thickness and rift architecture.

Jourdon, A., Mouthereau F., Le Pourhiet L., Callot J.-P. (2020) Topographic and tectonic evolution of mountain belts controlled by salt thickness and rift architecture. Tectonics, 39.

keywords: numerical modeling, salt tectonics, extension, compression, Pyrenees, lithospheric deformation

DOI: https://doi.org/10.1029/2019TC005903

Numerical modelling of Cretaceous Pyrenean Rifting: The interaction between mantle exhumation and syn‐rift salt tectonics

Duretz, T., Asti, R., Lagabrielle, Y., Brun, J-P., Jourdon, A.. (2019).Numerical modelling of Cretaceous Pyrenean Rifting: The interaction between mantle exhumation
and syn-rift salt tectonics. Basin Res. 2020;32: 652–667.

keywords: North Pyrenean rifting, numerical modeling, décollement, syn-rift salt tectonics, mantle exhumation, high temperature metamorphism

DOI: https://doi.org/10.1111/bre.12389

Role of rift maturity on the architecture and shortening distribution in mountain belts

Jourdon, A., Le Pourhiet, L., Mouthereau, F., Masini, E. (2019) Role of rift maturity on the architecture and shortening distribution in mountain belts. Earth and Planetary Science Letters, 512, 89-99.

keywords: rifting, collision, numerical modelling, Pyrenees, structural inheritance

DOI: https://doi.org/10.1016/j.epsl.2019.01.057