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Transport of Upper Pleistoscene loess particles by katabatic winds during the low stands of the English Channel

Jean-Pierre Lefort, Jean-Laurent Monnier and Guzel Danukalova
Journal of the Geological Society, https://doi.org/10.1144/jgs2019-070
Jean-Pierre Lefort
Université de Rennes 1, CNRSUMR 6566 CReAAH, Laboratoire Archéosciences, Campus de Beaulieu, (bât. 24-25), 74205 CS, 35042 Rennes cedex, France
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  • For correspondence: jeanpierre970@yahoo.fr
Jean-Laurent Monnier
Université de Rennes 1, CNRSUMR 6566 CReAAH, Laboratoire Archéosciences, Campus de Beaulieu, (bât. 24-25), 74205 CS, 35042 Rennes cedex, France
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Guzel Danukalova
Institute of Geology, Ufimian Federal Research Centre, Russian Academy of Sciences, 450077, Ufa, K. Marx, Str. 16/2; Kazan Federal University; Russia
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Abstract

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 metres. 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 paleo-rivers of the English Channel, as well as the southeast orientation of the paleo-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 which transported Icelandic basalts now grounded in Brittany and maybe by the orientation of Homo neandertalensis shelters.

Scientific editing by Philip Hughes

  • © 2019 The Author(s). Published by The Geological Society of London. All rights reserved

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Transport of Upper Pleistoscene loess particles by katabatic winds during the low stands of the English Channel

Jean-Pierre Lefort, Jean-Laurent Monnier and Guzel Danukalova
Journal of the Geological Society, 15 July 2019, https://doi.org/10.1144/jgs2019-070
Jean-Pierre Lefort
Université de Rennes 1, CNRSUMR 6566 CReAAH, Laboratoire Archéosciences, Campus de Beaulieu, (bât. 24-25), 74205 CS, 35042 Rennes cedex, France
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  • For correspondence: jeanpierre970@yahoo.fr
Jean-Laurent Monnier
Université de Rennes 1, CNRSUMR 6566 CReAAH, Laboratoire Archéosciences, Campus de Beaulieu, (bât. 24-25), 74205 CS, 35042 Rennes cedex, France
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Guzel Danukalova
Institute of Geology, Ufimian Federal Research Centre, Russian Academy of Sciences, 450077, Ufa, K. Marx, Str. 16/2; Kazan Federal University; Russia
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Transport of Upper Pleistoscene loess particles by katabatic winds during the low stands of the English Channel

Jean-Pierre Lefort, Jean-Laurent Monnier and Guzel Danukalova
Journal of the Geological Society, https://doi.org/10.1144/jgs2019-070
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