CONVERGENCE

OROGEN – SOURCE TO SINK – FLUIDS

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Maxime DAUDET

Initiation de l’accrétion continentale dans le domaine Bétique

Supervisors:
Frédéric Mouthereau and Stéphanie Brichau
GET-OMP, Toulouse

Major Results

The Betic Cordillera formed at ca. 50 Ma close to its present position and was reactivated between 20-15 Ma in extension to form part of the Alboran rifted margin. The Flyschs series are sourced from Africa. The horizontal translation of Internal Zones is limited to 200 km in support of delamination models of the Alboran sub-continental mantle.

Abstract

The Betic‐Rif orogen is a key region to understand the evolution of the plate boundary between Africa and Iberia/Europe. Based on stratigraphic and depositional evolution constraints, evidence for salt tectonics, combined with new apatite fission‐tracks (AFT) and (U‐Th‐Sm)/He ages from the Flysch Complex and the Subbetic Zone, we propose a geodynamic interpretation for the formation of the Betic Cordillera, accounting for moderate N‐directed transport of the Flysch Complex and synchronous exhumation between External and Internal Zones of the Betic. Early contraction between Africa and Iberia/Europe is reflected in the Cretaceous Flysch basin by a prolonged period of residence in the partial annealing zone for AFT and onset of foreland subsidence at 50 Ma

 

This stage lasted until the Early to Middle Miocene (20–15 Ma), marked by the rapid succession, in less than 5 Ma, of the deposition of Cenozoic flysch and their rapid exhumation. The Flysch Complex of the Western Betic have been deposited close to their current position on the Iberian paleomargin AFT‐AHe double‐dating indicates that the Flysch Complex recorded fast heating/burial and cooling/exhumation between 20 and 15 Ma Tectono‐thermal evolution of the flysch deposits is consistent with proto‐Betic collision at ca. 50 Ma

Tectono‐stratigraphic and thermal evolution of the western Betic flysch: implications for the geodynamics of South Iberian margin and Alboran Domain

Tectono‐stratigraphic and thermal evolution of the western Betic flysch: implications for the geodynamics of South Iberian margin and Alboran Domain

Daudet, M., Mouthereau, F., Brichau, S., Crespo‐Blanc, A., Gautheron, C., Angrand, P. (2020). Tectono‐stratigraphic and thermal evolution of the western Betic flysch: implications for the geodynamics of South Iberian margin and Alboran Domain Tectonics 39(7)
keywords:  plate kinematics, Iberia, Mesozoic Cenozoic, subduction, Marocco, Rif
DOI: https://dx.doi.org/10.1029/2020tc006093

Strain partitioning and exhumation in oblique Taiwan collision: role of rift architecture and plate kinematics

Strain partitioning and exhumation in oblique Taiwan collision: role of rift architecture and plate kinematics

Conand, C., Mouthereau, F., Ganne, J., Lin, A. T. S., Lahfid, A., Daudet, M., … & Bonzani, M. (2020). Strain partitioning and exhumation in oblique Taiwan collision: role of rift architecture and plate kinematics. Tectonics, 39(4).

keywords:  Taiwan, oblique collision, strain partitioning, transcurrent deformation, metamorphism, Raman spectroscopy

HAL: https://doi.org/10.1029/2019TC005798