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://univ-rennes.hal.science/hal-02303315 https://doi.org/10.1144/jgs2019-070 |
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ftunimainelemans:oai:HAL:hal-02303315v1 2024-02-11T10:04:51+01:00 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 Rennes (UR)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Université de Nantes - UFR Histoire, Histoire de l'Art et Archéologie (UFR HHAA) Université de Nantes (UN)-Université de Nantes (UN)-Ministère de la Culture (MC) Institute of Geology of the Ufimian Scientific Centre, Russian Academy of Sciences 2019-11 https://univ-rennes.hal.science/hal-02303315 https://doi.org/10.1144/jgs2019-070 en eng HAL CCSD Geological Society of London info:eu-repo/semantics/altIdentifier/doi/10.1144/jgs2019-070 hal-02303315 https://univ-rennes.hal.science/hal-02303315 doi:10.1144/jgs2019-070 EISSN: 2041-479X Journal of the Geological Society https://univ-rennes.hal.science/hal-02303315 Journal of the Geological Society, 2019, 176 (6), pp.1169-1181. ⟨10.1144/jgs2019-070⟩ [SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2019 ftunimainelemans https://doi.org/10.1144/jgs2019-070 2024-01-24T17:40:41Z 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 Le Mans Université: Archives Ouvertes (HAL) Journal of the Geological Society 176 6 1169 1181 |
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Open Polar |
collection |
Le Mans Université: Archives Ouvertes (HAL) |
op_collection_id |
ftunimainelemans |
language |
English |
topic |
[SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory [SDU.STU]Sciences of the Universe [physics]/Earth Sciences 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 |
[SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
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 Rennes (UR)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Université de Nantes - UFR Histoire, Histoire de l'Art et Archéologie (UFR HHAA) Université de Nantes (UN)-Université de Nantes (UN)-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://univ-rennes.hal.science/hal-02303315 https://doi.org/10.1144/jgs2019-070 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
EISSN: 2041-479X Journal of the Geological Society https://univ-rennes.hal.science/hal-02303315 Journal of the Geological Society, 2019, 176 (6), pp.1169-1181. ⟨10.1144/jgs2019-070⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1144/jgs2019-070 hal-02303315 https://univ-rennes.hal.science/hal-02303315 doi:10.1144/jgs2019-070 |
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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1790601603910205440 |