Transport of Late Pleistocene loess particles by katabatic winds during the lowstands of the English Channel
International audience Studies of the submerged Pleistocene conglomerate cored and dredged in the English Channel show that it resulted from the cementation of stony beaches under a loess blanket. Although the loess cover was later washed out by younger transgressions, the northern limit of the cong...
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Online Access: | https://doi.org/10.1144/jgs2019-070 https://hal-univ-rennes1.archives-ouvertes.fr/hal-02303315 |
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fttriple:oai:gotriple.eu:10670/1.zivoil 2023-05-15T16:40:33+02:00 Transport of Late Pleistocene loess particles by katabatic winds during the lowstands of the English Channel Lefort, Jean-Pierre Monnier, Jean-Laurent Danukalova, Guzel Centre de Recherche en Archéologie, Archéosciences, Histoire (CReAAH) Le Mans Université (UM)-Université de Nantes - UFR Histoire, Histoire de l'Art et Archéologie (UFR HHAA) Université de Nantes (UN)-Université de Nantes (UN)-Université de Rennes 2 (UR2) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Université de Rennes 1 (UR1) Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Ministère de la Culture (MC) Institute of Geology of the Ufimian Scientific Centre, Russian Academy of Sciences 2019-01-01 https://doi.org/10.1144/jgs2019-070 https://hal-univ-rennes1.archives-ouvertes.fr/hal-02303315 en eng HAL CCSD Geological Society of London hal-02303315 doi:10.1144/jgs2019-070 10670/1.zivoil https://hal-univ-rennes1.archives-ouvertes.fr/hal-02303315 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société EISSN: 2041-479X Journal of the Geological Society Journal of the Geological Society, Geological Society of London, 2019, 176 (6), pp.1169-1181. ⟨10.1144/jgs2019-070⟩ geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2019 fttriple https://doi.org/10.1144/jgs2019-070 2023-01-22T18:29:22Z International audience Studies of the submerged Pleistocene conglomerate cored and dredged in the English Channel show that it resulted from the cementation of stony beaches under a loess blanket. Although the loess cover was later washed out by younger transgressions, the northern limit of the conglomerate corresponds to the original offshore extension of the loess deposits. Compilation of offshore and onshore altitudes of the limits of these deposits shows that loess was deposited by low-level wind fields never thicker than 200 m. Mapping surveys show that the present limits of loess are probably close to their original boundaries. The past proximity of the British Ice Sheet, the accumulation of dusty sediments coating north-facing cliffs of Brittany originating in the outwash of the British–Irish Ice Sheet and in the palaeo-rivers of the English Channel, as well as the southeastward orientation of the palaeo-winds deduced from particle size analysis and heavy minerals distribution, suggest that large volumes of loess were transported by strong katabatic winds blowing from the northern ice-covered regions towards Brittany and Normandy. The existence of katabatic winds is also consistent with the drift of ice rafts that transported Icelandic basalts now grounded in Brittany and possibly with the orientation of Homo neandertalensis shelters. Article in Journal/Newspaper Ice Sheet Unknown Journal of the Geological Society 176 6 1169 1181 |
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English |
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geo envir |
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geo envir Lefort, Jean-Pierre Monnier, Jean-Laurent Danukalova, Guzel Transport of Late Pleistocene loess particles by katabatic winds during the lowstands of the English Channel |
topic_facet |
geo envir |
description |
International audience Studies of the submerged Pleistocene conglomerate cored and dredged in the English Channel show that it resulted from the cementation of stony beaches under a loess blanket. Although the loess cover was later washed out by younger transgressions, the northern limit of the conglomerate corresponds to the original offshore extension of the loess deposits. Compilation of offshore and onshore altitudes of the limits of these deposits shows that loess was deposited by low-level wind fields never thicker than 200 m. Mapping surveys show that the present limits of loess are probably close to their original boundaries. The past proximity of the British Ice Sheet, the accumulation of dusty sediments coating north-facing cliffs of Brittany originating in the outwash of the British–Irish Ice Sheet and in the palaeo-rivers of the English Channel, as well as the southeastward orientation of the palaeo-winds deduced from particle size analysis and heavy minerals distribution, suggest that large volumes of loess were transported by strong katabatic winds blowing from the northern ice-covered regions towards Brittany and Normandy. The existence of katabatic winds is also consistent with the drift of ice rafts that transported Icelandic basalts now grounded in Brittany and possibly with the orientation of Homo neandertalensis shelters. |
author2 |
Centre de Recherche en Archéologie, Archéosciences, Histoire (CReAAH) Le Mans Université (UM)-Université de Nantes - UFR Histoire, Histoire de l'Art et Archéologie (UFR HHAA) Université de Nantes (UN)-Université de Nantes (UN)-Université de Rennes 2 (UR2) Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Université de Rennes 1 (UR1) Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Ministère de la Culture (MC) Institute of Geology of the Ufimian Scientific Centre, Russian Academy of Sciences |
format |
Article in Journal/Newspaper |
author |
Lefort, Jean-Pierre Monnier, Jean-Laurent Danukalova, Guzel |
author_facet |
Lefort, Jean-Pierre Monnier, Jean-Laurent Danukalova, Guzel |
author_sort |
Lefort, Jean-Pierre |
title |
Transport of Late Pleistocene loess particles by katabatic winds during the lowstands of the English Channel |
title_short |
Transport of Late Pleistocene loess particles by katabatic winds during the lowstands of the English Channel |
title_full |
Transport of Late Pleistocene loess particles by katabatic winds during the lowstands of the English Channel |
title_fullStr |
Transport of Late Pleistocene loess particles by katabatic winds during the lowstands of the English Channel |
title_full_unstemmed |
Transport of Late Pleistocene loess particles by katabatic winds during the lowstands of the English Channel |
title_sort |
transport of late pleistocene loess particles by katabatic winds during the lowstands of the english channel |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://doi.org/10.1144/jgs2019-070 https://hal-univ-rennes1.archives-ouvertes.fr/hal-02303315 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société EISSN: 2041-479X Journal of the Geological Society Journal of the Geological Society, Geological Society of London, 2019, 176 (6), pp.1169-1181. ⟨10.1144/jgs2019-070⟩ |
op_relation |
hal-02303315 doi:10.1144/jgs2019-070 10670/1.zivoil https://hal-univ-rennes1.archives-ouvertes.fr/hal-02303315 |
op_rights |
undefined |
op_doi |
https://doi.org/10.1144/jgs2019-070 |
container_title |
Journal of the Geological Society |
container_volume |
176 |
container_issue |
6 |
container_start_page |
1169 |
op_container_end_page |
1181 |
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1766030957953941504 |