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Kinematic of the Maghrebian Thrust Belt and the Eu-Nu convergence in North Africa

Authors

Meghraoui,  Mustapha
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Hassen,  Abdellaoui
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Thiziri,  Saad
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Mohamed,  Salah
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Souhila,  Bagdi-Issaad
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Jugurtha,  Kariche
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Meghraoui, M., Hassen, A., Thiziri, S., Mohamed, S., Souhila, B.-I., Jugurtha, K. (2023): Kinematic of the Maghrebian Thrust Belt and the Eu-Nu convergence in North Africa, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4866


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021270
Abstract
The Maghrebian Atlas Mountains in North Africa results from the Nubia – Eurasia (Nu-Eu) plate convergence in the western Mediterranean. In this study, we examine the correlation between the thrust belt and adjacent Sahara Platform domains in the light of new GPS and seismotectonic results. We also test the Quaternary tectonics and seismotectonic activity from the GPS velocities and determine 3 – 6 mm/yr oblique convergence with transpression and block rotations. The diffuse Nu-Eu plate boundary originally limited to the North Africa coastline extends further south to include the Maghrebides tectonic blocks and southern Sahara Atlas suture zone, the Rif and Tell Atlas, Middle Atlas, High Plateau, and High and Sahara Atlas. The kinematics and late Quaternary strain distribution show westward anticlockwise rotations with an average 3°/Myr from NNW-SSW to WNW-ESE. The transpressive tectonic system is also conducted by large East-West trending right-lateral shear zones inducing clockwise rotation on regional tectonic blocks consistent with paleomagnetic results along the Tell Atlas. The crustal deformation is documented along the tectonic blocks of the Atlas Mountains and Sahara Platform pointing out large earthquakes and the displacement field with strain partitioning largely controlled by the Nu-Eu plate motions.