Successful combination of electron spin resonance, luminescence and palaeomagnetic dating methods allows reconstruction of the Pleistocene evolution of the lower Moulouya river (NE Morocco)

Détails

ID Serval
serval:BIB_821F5BECA817
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Successful combination of electron spin resonance, luminescence and palaeomagnetic dating methods allows reconstruction of the Pleistocene evolution of the lower Moulouya river (NE Morocco)
Périodique
Quaternary Science Reviews
Auteur⸱e⸱s
Bartz Melanie, Rixhon Gilles, Duval Mathieu, King Georgina E., Álvarez Posada Claudia, Parés Josep M., Brückner Helmut
ISSN
0277-3791
Statut éditorial
Publié
Date de publication
04/2018
Peer-reviewed
Oui
Volume
185
Pages
153-171
Langue
anglais
Résumé
Based on a combination of Electron Spin Resonance (ESR) dating of quartz, luminescence dating of K-feldspar and palaeomagnetism, this study presents the first chronostratigraphic framework for the Pleistocene fluvial deposits of the lower Moulouya river in the Triffa basin (NE Morocco). K-feldspar pIRIR225 and pIRIR290 signals of all samples are saturated, suggesting fluvial deposition at least as early as the Middle Pleistocene (∼0.39–0.80 Ma). Consequently, further chronological information was obtained with ESR dating of quartz grains from the ancient Pleistocene fluvial deposits. As for ESR, the multiple centres approach provides equivalent dose values derived from the Al and Ti centres that mostly agree within 1σ-error, suggesting complete signal resetting from the former during fluvial transport. ESR dating results yield Calabrian deposition ages for all river profiles from ∼1.1 to ∼1.5 Ma. These ages are remarkably consistent with the palaeomagnetic results: the occurrence of mostly reversed polarity in the deposits indicates a Matuyama age (>0.78 Ma). While low incision rates in the Triffa basin (0.025 ± 0.003 mm/a) related to thrusting activity during the Calabrian could be inferred, the fluvial record points to an acyclic and discontinuous sedimentation pattern over the last ∼1.3 Ma. It thereby probably rules out climate as the main driver for fluvial aggradation in the lowermost sedimentary basin. At a regional scale, several indicators point to transient fluvial response resulting from major Quaternary tectonic activity along the Beni Snassen gorge, located directly upstream of the investigated basin. We suggest that a capture event at the margin of the uplifting Beni Snassen massif occurred between 1.04 and 1.36 Ma at the latest and subsequently led to the creation of the gorge.
Mots-clé
Geology, Archeology, Archeology, Ecology, Evolution, Behavior and Systematics, Global and Planetary Change
Web of science
Financement(s)
Fonds national suisse / PZ00P2-167960
Création de la notice
14/08/2018 6:40
Dernière modification de la notice
23/12/2022 15:45
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