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Unité fluviatile à échardes volcaniques d’un interstade à Bétula/Pinus antérieur à 53ka (début du MIS3) et optimum glaciaire pendant le MIS4 au nord des Vosges Centrales

Abstract : A continuous sedimentary sequence has been deposited for more than 53 ka in the Fave River Valley, laterally to the intra-Vosgian basin of St-Dié. The coarse material of the lower alluvial sheet of the sequence is the result of torrential flows from melting neves and ice masses accumulated during MIS 4 on the highlands at the South of the valley. The upper alluvial silty sheet records a slow deposition of fine sediments without interstratified torrential beds. There was no significant accumulation of neves or ice on the southern watershed of the Fave River during the LGM and Late Glacial. The upper sheet of the sequence contains a stratified and discontinuous peaty basal unit dated to more than 53 ka and containing volcanic glass shards and interstadial Betula/Pinus pollen followed by stadial cold steppic species. The local interstadial is correlated to the Goulotte episode of the pollen sequence of Grande Pile, at the beginning of MIS 3. The age is compatible with the St-Germain tephra. These data from the northern edge of the central Vosges Mountains provide further support for the glacial model established in southern Vosges, with early heavy snowfalls during the beginning of the Middle Würmian (MIS 4) and smaller extent of the glaciers with dryer and colder climatic conditions during late Würmian (MIS 2).
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https://hal.univ-lorraine.fr/hal-03216364
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Submitted on : Tuesday, May 4, 2021 - 12:58:51 AM
Last modification on : Tuesday, May 10, 2022 - 3:38:05 PM

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S. Occhietti, A. Gebhardt, P. Ruffaldi, G. Allenet de Ribemont, A.V. Walter-Simonnet. Unité fluviatile à échardes volcaniques d’un interstade à Bétula/Pinus antérieur à 53ka (début du MIS3) et optimum glaciaire pendant le MIS4 au nord des Vosges Centrales. Quaternaire, AFEQ-CNF INQUA, 2020, 31 (1), pp.1-17. ⟨10.4000/quaternaire.13126⟩. ⟨hal-03216364⟩

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