Rodolphe LESCOUTRE

Formation and reactivation of the Pyrenean-Cantabrian rift system: inheritance, segmentation and thermal evolution

Supervisor:
Gianreto Manatschal, IPGS – Université de Strasbourg

Major Results

The architecture of the Pyrenean-Cantabrian junction results from the combination and juxtaposition of both thin- and thick-skinned deformations at an inverted rift accommodation zone between two overlapping rift segments. The thermal architecture of asymmetric rift systems can result from a complex and diachronous thermal evolution.

Abstract

This study aims to describe the role of rift-inheritance and segmentation for reactivation and to investigate the influence of asymmetric rifting on the syn-rift thermal evolution, using the Pyrenean-Cantabrian system as a natural laboratory. The study of the Pyrenean-Cantabrian junction discards the existence of a Pamplona transform fault between the two rift segments and argues for an accommodation zone where rift segments overlap north and south of the Basque massifs in relation with north-south direction of extension (Lescoutre et al., submitted).

During convergence, rift segmentation and the Triassic evaporite decoupling horizon controlled the reactivation and the local orogenic architecture (Lescoutre & Manatschal, 2020). Finally, this study shows that asymmetric hyperextension is associated with asymmetric and diachronous thermal evolution, and highlights the importance of understanding the tectonic evolution to define the thermal architecture (Lescoutre et al., 2019).

Role of rift-inheritance and segmentation for orogenic architecture: example from the Pyrenean-Cantabrian system

Lescoutre, R. & Manatschal, G. (2020). Role of rift-inheritance and segmentation for orogenic evolution: example from the Pyrenean-Cantabrian system, BSGF – Earth Sciences Bulletin 191: 18. https://doi.org/10.1051/bsgf/2020021

keywords: Pyrenees, Mauléon, Basque Cantabrian belt, Rift inheritances, strain partitioning, soft transfer zone, Pamplona fault inversion, non-cylindricity

DOI: https://doi.org/10.1051/bsgf/2020021

PhD Thesis: Formation et réactivation du système de rift pyrénéo-cantabrique : héritage, segmentation et évolution thermique

Lescoutre, Rodolphe. Formation et réactivation du système de rift pyrénéo-cantabrique : héritage, segmentation et évolution thermique. Sciences de la Terre et de l’Univers. Université de Strasbourg

keywords: Rift inheritance, Segmentation, Reactivation, Pyrénées, Thermal evolution, Hyper-extension, Rifts, Tectonics

DOI: https://publication-theses.unistra.fr/public/theses_doctorat/2019/Lescoutre_Rodolphe_2019_ED413.pdf

Thermal evolution of asymmetric hyperextended magma-poor rift systems: results from numerical modelling and Pyrenean field observations.

Lescoutre, R., Tugend, J., Brune, S., Masini, E. & Manatschal, G. (2019)
Thermal evolution of asymmetric hyperextended magma-poor rift systems: results from numerical modelling and Pyrenean field observations. Geochemistry Geophysics Geosystems 20(1)

keywords: Thermal evolution, Asymmetric rifting, Numerical model, Field analogue, Pyrenees, Heat flow

DOI: https://doi.org/10.1029/2019GC008600