Chronostratigraphy of two Late Pleistocene loess-palaeosol sequences in the Rhone Valley (southeast France)
A sedimentological and chronostratigraphical investigation was carried out on two loess sections located in the Mediterranean area in southeast France along the Rhone River (Lautagne) and the lower reach of a tributary of the Rhone River (Collias). High-resolution sampling (5-20 cm) for magnetic sus...
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| Main Authors: | , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
1 October 2020
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| In: |
Quaternary science reviews
Year: 2020, Volume: 245 |
| ISSN: | 0277-3791 |
| DOI: | 10.1016/j.quascirev.2020.106473 |
| Online Access: | Volltext
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| Author Notes: | Mathieu Bosq, Sebastian Kreutzer, Pascal Bertran, Jean-Philippe Degeai, Pauline Dugas, Annette Kadereit, Philippe Lanos, Olivier Moine, Nora Pfaffner, Alain Queffelec, Daniela Sauer |
| Summary: | A sedimentological and chronostratigraphical investigation was carried out on two loess sections located in the Mediterranean area in southeast France along the Rhone River (Lautagne) and the lower reach of a tributary of the Rhone River (Collias). High-resolution sampling (5-20 cm) for magnetic susceptibility, grain size distribution (including non-parametric end-member modelling), colour reflectance and geochemistry was performed. The chronology was based on luminescence dating of quartz grains and radiocarbon dating of small gastropod shells, coupled with hierarchical Bayesian modelling. The Collias section (similar to 8 m thick) records the whole last climatic cycle. It comprises a thick red basal pedocomplex S1 developed during the Last Interglacial and the Early Glacial, similar to that observed elsewhere in southern and southeastern Europe. Loess deposition occurred during the Lower (L1L2) and the Upper Pleniglacial (L1L1). It was interrupted by soil formation during the Middle Pleniglacial, of which a brown Bwk horizon has been preserved (L1S1). By contrast, the similar to 5 m thick Lautagne section provides a detailed record of the Upper Pleniglacial. Weakly developed hydromorphic soils are correlated with the Greenland Interstadials GI-4 to GI-2, while the main period of coarse loess sedimentation corresponds to the Greenland Stadials GS-5 to GS-2. At a regional scale, the time of loess deposition ranges between 38.5 ka and 12 ka, with a peak at similar to 28-24 ka, overlapping with the maximal advance of the Alpine Ice Sheet (AIS). This strongly suggests that regional glacier dynamics was the main driver of loess sedimentation. (C) 2020 Elsevier Ltd. All rights reserved. |
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| Item Description: | Online veröffentlicht: 18. August 2020 Gesehen am 15.01.2021 |
| Physical Description: | Online Resource |
| ISSN: | 0277-3791 |
| DOI: | 10.1016/j.quascirev.2020.106473 |