Reconstruction of the rockfall frequency in the Mont Blanc massif since the Last Glacial Maximum using TCN dating and laboratory reflectance spectroscopy. A complete dataset of 72 samples.

• Main Authors: Gallach, Xavi, Ogier, Christophe, Carcaillet, Julien, Ravanel, Ludovic, Deline, Philip
• Other Authors: Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de la Terre (ISTerre), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ), European Geosciences Union
• Format: Conference Object
• Language: English
• Published: HAL CCSD 2018
• Subjects: [SDE.BE]Environmental Sciences/Biodiversity and Ecology; [SDE.ES]Environmental Sciences/Environmental and Society; [SDE.MCG]Environmental Sciences/Global Changes; [SDE.IE]Environmental Sciences/Environmental Engineering; [SHS.GEO]Humanities and Social Sciences/Geography; Mont Blanc; permafrost
• Online Access: https://hal-sde.archives-ouvertes.fr/hal-01756991

Rockfalls and rock avalanches are active processes, including hazards for infrastructures and outdoor activities.Present rockfalls are well surveyed and documented in the Mont Blanc massif thanks to a network of observersset up in 2007, and composed of hut keepers, mountain guides, alpinists and infrastructure workers. Frequencyover the past 150 years of massif rockfall, studied by comparison of historical photographs, has strongly increasedduring the last 30 years, especially during very hot summer (2003 and 2015), likely due to permafrost degradationdriven by the climate change.In order to understand at a longer timescale the relationship between rockfall frequency and climate dynamicsin the Mont Blanc massif, we use Terrestrial Cosmogenic Nuclide (TCN) dating to obtain the exposure ages ofLateglacial and Holocene rockfall scars and old rockwall surfaces, and glacial and climate proxies to verify thehypothesis that rockfalls were more frequent in warm periods.55 samples have been collected at 9 sites of the Glacier du Géant basin, at elevation in the range 3300-3800 m a.s.l.These new exposure ages were completed by the 25 others TCN ages sampled during two previous campaigns andrecalculated using the newest input parameters. A total of 72 ages were obtained, between 0.04 ± 0.02 and 100.50± 8.50 ka.We found four age clusters. Two clusters are related to the Holocene Warm Period (∼ 6.1-7.4 ka) and RomanWarm Period (∼ 1.6-2.3 ka); a cluster of LIA-post-LIA ages is mainly composed by smaller rockfalls, consideredas the ‘normal’ erosion. A forth cluster have been recognized at ∼ 4.2-5.0 ka.Data suggest a relationship between the reflectance spectral data of the scar surfaces and exposure ages, mainlyin the E-SE-S aspects. Fresh rock surfaces of recent rockfall scars are light grey, whereas long-time exposedweathered rock surfaces range from light orange to dark red. This confirms the initial hypothesis: the redder a rocksurface, the older its age. Reflectance spectroscopy is used to quantify the granite surface ...