Article Dans Une Revue Precambrian Research Année : 2024

Archean craton assembly and Paleoproterozoic accretion-collision tectonics in the Reguibat Shield, West African Craton

Résumé

Interpretation of the deformation pattern of the western Reguibat Shield by integrating current geochronological knowledge allows deciphering the assembly and post-assembly tectonic history of the Awsard craton that became involved in the giant Eburnean (~2 Ga) accretionary orogen. Final craton assembly took place along the newly recognized early Siderian (2.51–2.46 Ga) Tiris orogen. The eastern margin of the craton was then affected until 2.07–2.03 Ga by a west-verging (i.e., craton-ward) thrust system rooted in the collisional contact with the Eburnean orogen. Collision was controlled by thermal erosion and softening of the craton edge by the accretionary orogen, which allowed for the propagation of the thrust system during craton-ward progression of delamination of the cratonic lithospheric mantle. This resulted in the progressive incorporation of Archean crust into the accretionary orogen. Such a hot mode of collision provides a mechanism for the destruction of cratons by reworking of their crust into their flanking accretionary orogens and recycling of their lithospheric mantle into the asthenosphere. The hot collision mode favors the formation of specific oroclines driven by lithospheric mantle delamination .
Fichier principal
Vignette du fichier
Chardon_2024.pdf (7.02 Mo) Télécharger le fichier
Origine Fichiers éditeurs autorisés sur une archive ouverte
Licence

Dates et versions

hal-04907515 , version 1 (23-01-2025)

Licence

Identifiants

Citer

Dominique Chardon, Julien Berger, Florian Martellozzo. Archean craton assembly and Paleoproterozoic accretion-collision tectonics in the Reguibat Shield, West African Craton. Precambrian Research, 2024, 413, pp.107570. ⟨10.1016/j.precamres.2024.107570⟩. ⟨hal-04907515⟩
0 Consultations
0 Téléchargements

Altmetric

Partager

More