Evolution of the Late Pleistocene Aspe River (Western Pyrenees, France). Signature of climatic events and active tectonics

Abstract : We make use of the cosmogenic nuclide 10Be exposure to date an alluvial terrace of the Aspe River in the foothills of the northwestern Pyrenees. Initially ascribed to the Rissian glaciation, our dating shows that the terrace was abandoned at 18 ± 2 kyr. In reference to the Late Pleistocene climatic chronology, two kinds of terraces can be distinguished: high-standing fill terraces probably deposited during glacial events and lower cut-in-fill and strath terraces cut during the postglacial river incision. A part of the terrace aggradations could have occurred during the Würmian glacial episodes. Hence, the dated terrace fits in with the prevailing view of incision during climate transitions. Our study also shows that elevation is not a good criterion of terrace correlation, which should be better carried out on the basis of absolute dating. In addition, this dating also suggests a potential Late Pleistocene fault reactivation of the Mail Arrouy thrust in this tectonically active area of the Western Pyrenees.
Type de document :
Article dans une revue
Liste complète des métadonnées

https://hal-univ-perp.archives-ouvertes.fr/hal-01291321
Contributeur : Olivier Savoyat <>
Soumis le : lundi 21 mars 2016 - 12:43:24
Dernière modification le : mardi 11 septembre 2018 - 15:19:03

Lien texte intégral

Identifiants

Collections

Citation

Bertrand Nivière, Pierre Lacan, Vincent Regard, Magali Delmas, Marc Calvet, et al.. Evolution of the Late Pleistocene Aspe River (Western Pyrenees, France). Signature of climatic events and active tectonics. Comptes Rendus Géoscience, Elsevier Masson, 2016, 〈http://www.sciencedirect.com/science/article/pii/S1631071315001479〉. 〈10.1016/j.crte.2015.07.003〉. 〈hal-01291321〉

Partager

Métriques

Consultations de la notice

406