%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Chenet, M.
%A Brunstein, D.
%A Jomelli, V.
%A Roussel, E.
%A Rinterknecht, V.
%A Mokadem, F.
%A Biette, M.
%A Robert, V.
%A Leanni, Laetitia
%T Be-10 cosmic-ray exposure dating of moraines and rock avalanches in the Upper Romanche valley (French Alps) : evidence of two glacial advances during the Late Glacial/Holocene transition
%D 2016
%L fdi:010068142
%G ENG
%J Quaternary Science Reviews
%@ 0277-3791
%K Glacier fluctuations ; Be-10 cosmic-ray exposure dating ; Late Glacial ; Holocene ; French Alps
%K FRANCE ; ALPES
%M ISI:000383313100015
%P 209-221
%R 10.1016/j.quascirev.2016.07.025
%U https://www.documentation.ird.fr/hor/fdi:010068142
%> https://www.documentation.ird.fr/intranet/publi/2016/10/010068142.pdf
%V 148
%W Horizon (IRD)
%X Cosmic-ray exposure (CRE) dating of moraines allow glacier fluctuations and past climate change reconstructions. In the French Alps, there is a lack of moraine dating for the Late Glacial/Holocene transition period. Here we present a chronology of glacier advances in the Upper Romanche valley (French Alps - Massif des Ecrins) based on Be-10 CRE dating. CRE ages of moraines of 13.0 +/- 1.1 ka and 12.4 +/- 1.5 ka provide evidence for two stages of glacial advance or standstill at the end of the Late Glacial. The CRE dating of a rock avalanche deposit at 12.2 +/- 1.5 ka is attributed to post-glacial debuttressing and reveals rapid deglaciation at the end of the Late Glacial. A CRE age of 7.1 +/- 0.7 ka of a second mass wasting, whose triggering factor is unidentified so far, indicates that up to an altitude of 2300 m a.s.l., the valley was ice-free as of similar to 7 kyr at the latest. The re-evaluation of 21 moraine Be-10 CRE ages from nine glacial valleys across the Alps shows multiple glacial advances occurring at the Late Glacial/Holocene transition. These results lead to a re-evaluation of the importance of cooling events during the Allerod and the Younger Dryas in the Alps.
%$ 062 ; 064