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Données nouvelles sur la chronologie de la déglaciation dans la vallée du haut-Verdon (alpes françaises du sud)

Abstract : This study presents new 14C AMS ages obtained from the sedimentary sequence of Lake Allos (elevation: 2,230 m, Verdon valley, Southern Alps, France). These ages provide new evidence on the last deglaciation over the Southern Alps, enabling us to revise the chronological framework previously established. Sedimentation in the lake began between 12,300 and 13,500 cal. yr BP (2 sigma interval). The two glacial stages identified in a cirque downstream of Lake Allos (at 1,900 m a.s.l.) and on the glacial threshold (at 2,300 m a.s.l.) are hence older. Our results are in good agreement with previous conclusions based on palynological evidence from high-elevations peat bogs and lakes that suggested an earlier deglaciation, at the onset of the Lateglacial.
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https://hal.archives-ouvertes.fr/hal-02046381
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Elodie Brisset, Cécile Miramont, Frédéric Guiter, Fabien Arnaud, Edward Anthony, et al.. Données nouvelles sur la chronologie de la déglaciation dans la vallée du haut-Verdon (alpes françaises du sud). Quaternaire, AFEQ-CNF INQUA, 2014, 25 (2), pp.147-156. ⟨10.4000/quaternaire.7028⟩. ⟨hal-02046381⟩

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