TY - JOUR
T1 - Chronostratigraphy of two Late Pleistocene loess-palaeosol sequences in the Rhône Valley (southeast France)
AU - Bosq, Mathieu
AU - Kreutzer, Sebastian
AU - Bertran, Pascal
AU - Degeai, Jean-philippe
AU - Dugas, Pauline
AU - Kadereit, Annette
AU - Lanos, Philippe
AU - Moine, Olivier
AU - Pfaffner, Nora
AU - Queffelec, Alain
AU - Sauer, Daniela
N1 - Funding Information:
This research was conducted in the PACEA laboratory with the financial support of the LaScArBx (research program of the Agence Nationale de la Recherche ANR-10-LABX-52 ), involving the University of Bordeaux and the University of Bordeaux-Montaigne. The preparation of the samples from Lautagne was greatly supported by the luminescence team from the Justus-Liebig University of Giessen (head: Prof Dr Markus Fuchs), namely Veit van Diedenhoven and Urs Tilmann Wolpert, who helped out in times of need. The preparation of the samples from Collias was made possible by the luminescence team from the University of Bayreuth (head: Dr Christoph Schmidt) who gave us access to their sieving equipment. The remaining sample preparation in Bordeaux was supported by Julie Faure and Pierre Bidaud. Additional support was also provided by the Institut national de recherches archéologiques Préventives (Inrap). C. Ronco and E. Morin who provided us an access to the archaeological excavations of Lautagne are warmly acknowledged. We also acknowledge the archaeologists who conducted the excavations and survey of Garons Mitra V, Soyons and Saint-Péray, particulary M. Laroche, J.-M. Lurol, B. Gely, J.-M. Le Pape, F. Derym. We would like to thank M. Rué, C. Recq, A. Ajas and J.-L. Brochier for providing us with their OSL dating results. We warmly thank Lee Drake for his invaluable help in calibration of the ED-XRF portable Bruker Tracer 5i. Finally, the two reviewers, F. Lehmkuhl and D.-D Rousseau are acknowledged for their valuable comments.
Funding Information:
This research was conducted in the PACEA laboratory with the financial support of the LaScArBx (research program of the Agence Nationale de la Recherche ANR-10-LABX-52), involving the University of Bordeaux and the University of Bordeaux-Montaigne. The preparation of the samples from Lautagne was greatly supported by the luminescence team from the Justus-Liebig University of Giessen (head: Prof Dr Markus Fuchs), namely Veit van Diedenhoven and Urs Tilmann Wolpert, who helped out in times of need. The preparation of the samples from Collias was made possible by the luminescence team from the University of Bayreuth (head: Dr Christoph Schmidt) who gave us access to their sieving equipment. The remaining sample preparation in Bordeaux was supported by Julie Faure and Pierre Bidaud. Additional support was also provided by the Institut national de recherches arch?ologiques Pr?ventives (Inrap). C. Ronco and E. Morin who provided us an access to the archaeological excavations of Lautagne are warmly acknowledged. We also acknowledge the archaeologists who conducted the excavations and survey of Garons Mitra V, Soyons and Saint-P?ray, particulary M. Laroche, J.-M. Lurol, B. Gely, J.-M. Le Pape, F. Derym. We would like to thank M. Ru?, C. Recq, A. Ajas and J.-L. Brochier for providing us with their OSL dating results. We warmly thank Lee Drake for his invaluable help in calibration of the ED-XRF portable Bruker Tracer 5i. Finally, the two reviewers, F. Lehmkuhl and D.-D Rousseau are acknowledged for their valuable comments.
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/10/1
Y1 - 2020/10/1
N2 - A sedimentological and chronostratigraphical investigation was carried out on two loess sections located in the Mediterranean area in southeast France along the Rhône River (Lautagne) and the lower reach of a tributary of the Rhône 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 (∼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 ∼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 ∼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.
AB - A sedimentological and chronostratigraphical investigation was carried out on two loess sections located in the Mediterranean area in southeast France along the Rhône River (Lautagne) and the lower reach of a tributary of the Rhône 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 (∼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 ∼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 ∼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.
KW - Loess
KW - Southeast France
KW - Chronology
KW - Geochemistry
KW - Grain-size distribution
KW - Last glacial
UR - https://www.sciencedirect.com/science/article/pii/S0277379120304352?via%3Dihub#appsec1
UR - http://www.scopus.com/inward/record.url?scp=85089424434&partnerID=8YFLogxK
U2 - 10.1016/j.quascirev.2020.106473
DO - 10.1016/j.quascirev.2020.106473
M3 - Article
SN - 0277-3791
VL - 245
JO - Quaternary Science Reviews
JF - Quaternary Science Reviews
M1 - 106473
ER -