RAPID AEOLIAN EVENTS WITHIN THE WEICHSELIAN UPPER PLENIGLACIAL LOESS : THE EXAMPLE OF THE NUSSLOCH SEQUENCE (RHINE VALLEY, GERMANY).

International audience Vanations of detailed grain size and magnetic susceptibility records in the Nussloch loess sequence (Rhine Valley), where the sedimentation rate is especially high (1 to 2m per ka on more than 10 m) are presented. This study leads to evidence more or less cyclic vanations of t...

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Bibliographic Details
Published in:Quaternaire
Main Authors: Antoine, Pierre, Rousseau, Denis Didier, Hatté, Christine, Zöller, Ludwig, Lang, Andréas, Fontugne, Michel, Moine, Olivier
Other Authors: Laboratoire de géographie physique : Environnements Quaternaires et Actuels (LGP), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Université Paris 1 Panthéon-Sorbonne (UP1), Institut des Sciences de l'Evolution de Montpellier (UMR ISEM), École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre National de la Recherche Scientifique (CNRS)-Institut de recherche pour le développement IRD : UR226, Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Géochrononologie Traceurs Archéométrie (GEOTRAC), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Universität Bayreuth, Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven)
Format: Article in Journal/Newspaper
Language:French
Published: HAL CCSD 2002
Subjects:
Online Access:https://hal.archives-ouvertes.fr/hal-02497460
https://hal.archives-ouvertes.fr/hal-02497460/document
https://hal.archives-ouvertes.fr/hal-02497460/file/quate_1142-2904_2002_num_13_3_1712.pdf
https://doi.org/10.3406/quate.2002.1712
Description
Summary:International audience Vanations of detailed grain size and magnetic susceptibility records in the Nussloch loess sequence (Rhine Valley), where the sedimentation rate is especially high (1 to 2m per ka on more than 10 m) are presented. This study leads to evidence more or less cyclic vanations of these indices between about 30 and 17 ka. These vanations, especially well expressed by the evolution of the IGR (% 20-50um / % <20um), are considered to be an indirect measurement of the aeohan dynamic intensity and of the sedimentation rate dunng loess deposition (high ratio in typical unweathered loess (Loess events LI to L8) / low ratio in tundra gleys horizons Gl to G8 (reduction or stop of the sedimentation, permafrost development.). On the basis of OSL, and of I4C dates on loess organic matter, we show that dunng the Upper Pleniglacial the loess deposition was especially fast and discontinuous, and resulted from a succession of rapid deposition phases, separated by stops or strong reduction of the aeohan flux sedimentation dunng some centunes. A temptative correlation with the Greenland dust record (GRIP) is proposed. In addition we can observe a parallel between Henrich 2 event and one of the main penod of loess deposition around 22-23 ka. Finally, the companson with the magnetic susceptibility record andthe grain-size data show that the period charactenzed by a high grain-size index, are also underlined by an increase in the amount of ferromagnetic minerals reworked from the Rhine alluvial plain located at the foot of the site (enhancement in the frequency of the storms from N-NW). L'étude des variations de la granulométrie et de la susceptibilité magnétique dans la séquence de Nussloch (Vallée du Rhin), où le taux de sédimentation est particulièrement élevé (1 à 2 m/ka sur plus de 10m), débouche sur la mise en évidence de variations plus ou moins cycliques entre 30 et 17 ka environ. Ces vanations, particulièrement bien soulignées par l'évolution du rapport % 20- 50um / % <20 um (indice IGR), sont ...