Continental palaeoenvironments during MIS 2 and 3 in southwestern France: the La Ferrassie rockshelter record - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Quaternary Science Reviews Année : 2008

Continental palaeoenvironments during MIS 2 and 3 in southwestern France: the La Ferrassie rockshelter record

Résumé

Reappraisal of La Ferrassie rockshelter sequence provides novel information on the continental palaeoenvironments in southwestern France during the end of Marine Isotope Stage 3 and the beginning of MIS 2. Cycles of sedimentation and soil development have been recognised, and are tentatively interpreted as reflecting the Dansgaard/Oeschger climatic cycles. From bottom to top, the sequence shows a trend to progressive reduction in length (and/or intensity) of the soil-forming periods and conversely, an increase in frost-related processes and sedimentation. Cambisols, associated with significant clay weathering and decalcification, developed at the base of the sequence (≥35 to not, vert, similar30 14C kyr BP). They are then replaced by simple carbonate-rich humus horizons during the interval not, vert, similar30 to not, vert, similar28 14C kyr BP. At the beginning of MIS 2, the talus dynamics shifts from rockfall accumulation with intense snow-induced washing to stone-banked solifluction lobes in connection to a semi-desert-like periglacial environment.

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Géochimie

Dates et versions

hal-00337575 , version 1 (07-11-2008)

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Citer

Pascal Bertran, Laurent Caner, Roger Langohrd, Laurent Lemée, Francesco d'Errico. Continental palaeoenvironments during MIS 2 and 3 in southwestern France: the La Ferrassie rockshelter record. Quaternary Science Reviews, 2008, 27 (21-22), pp.2048-2063. ⟨10.1016/j.quascirev.2008.08.022⟩. ⟨hal-00337575⟩
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