Publications des scientifiques de l'IRD

Chardon Dominique, Bamba O., Traor Kalidou. (2020). Eburnean deformation pattern of Burkina Faso and the tectonic significance of shear zones in the West African craton. BSGF : Earth Sciences Bulletin, 191, 2 [18 p.]. ISSN 0037-9409.

Titre du document
Eburnean deformation pattern of Burkina Faso and the tectonic significance of shear zones in the West African craton
Année de publication
2020
Type de document
Article référencé dans le Web of Science WOS:000557387300001
Auteurs
Chardon Dominique, Bamba O., Traor Kalidou
Source
BSGF : Earth Sciences Bulletin, 2020, 191, 2 [18 p.] ISSN 0037-9409
Shear zones of the Paleoproterozoic Eburnean accretionary Orogen (West African craton) are investigated by means of large-scale structural mapping. Regional scale (10-100 km) mapping was based on the aeromagnetic survey of Burkina Faso and craton-scale (1000 km) mapping on a compilation of fabric data. At both scales, shear zones are arranged as an anastomosed transpressional network that accommodated distributed shortening and lateral flow of the orogenic lithosphere between the converging Kenema-Man and Congo Archean provinces. Structural interference patterns at both scales were due to three-dimensional partitioning of progressive transpressional deformation and interactions among shear zones that absorbed heterogeneities in the regional flow patterns while maintaining the connectivity of the shear zone network. Such orogen-scale kinematic patterns call for caution in using the deformation phase approach without considering the "bigger structural picture" and interpreting displacement history of individual shear zones in terms of plate kinematics. The West African shear zone pattern is linked to that of the Guiana shield through a new transatlantic correlation to produce an integrated kinematic model of the Eburnean-Transamazonian orogen.
Plan de classement
Géologie et formations superficielles [064]
Description Géographique
BURKINA FASO
Localisation
Fonds IRD [F B010079463]
Identifiant IRD
fdi:010079463
Contact