Reconstruction of sediment transfers from the Irish Sea margin and the Fleuve Manche (English Channel) palaeoriver over the last climatic cycles
The Pleistocene has been period of fluctuating climate accompanied by prominent sea-level lowstands during the glacial intervals, when massive continental ice sheets extended from mountainous to lowland European areas. The retreat of the shoreline on the extensive present-day shallow continental she...
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Online Access: | https://tel.archives-ouvertes.fr/tel-00389403 https://tel.archives-ouvertes.fr/tel-00389403/document https://tel.archives-ouvertes.fr/tel-00389403/file/Toucanne2008.pdf |
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ftccsdartic:oai:HAL:tel-00389403v1 2023-05-15T16:12:59+02:00 Reconstruction of sediment transfers from the Irish Sea margin and the Fleuve Manche (English Channel) palaeoriver over the last climatic cycles Reconstruction des transferts sédimentaires en provenance du système glaciaire de Mer d'Irlande et du paléofleuve Manche au cours des derniers cycles climatiques Toucanne, Samuel Université Sciences et Technologies - Bordeaux 1 Unité de recherche Géosciences Marines (Ifremer) (GM) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Université Sciences et Technologies - Bordeaux I Michel Cremer, Sébastien Zaragosi, Jean-François Bourillet 2008-12-08 https://tel.archives-ouvertes.fr/tel-00389403 https://tel.archives-ouvertes.fr/tel-00389403/document https://tel.archives-ouvertes.fr/tel-00389403/file/Toucanne2008.pdf fr fre HAL CCSD tel-00389403 https://tel.archives-ouvertes.fr/tel-00389403 https://tel.archives-ouvertes.fr/tel-00389403/document https://tel.archives-ouvertes.fr/tel-00389403/file/Toucanne2008.pdf info:eu-repo/semantics/OpenAccess https://tel.archives-ouvertes.fr/tel-00389403 Minéralogie. Université Sciences et Technologies - Bordeaux I, 2008. Français Bay of Biscay sediment transfer turbidite systems climate ice sheets ‘Fleuve Manche' palaeoriver glacial Irish Sea system European fluvial system Land-sea correlations Golfe de Gascogne transferts sédimentaires systèmes turbiditiques Pléistocène climat glaciations calottes glaciaires Fleuve Manche système glaciaire de Mer d'Irlande réseau de drainage européen corrélations terre-mer [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy info:eu-repo/semantics/doctoralThesis Theses 2008 ftccsdartic 2021-04-04T00:10:16Z The Pleistocene has been period of fluctuating climate accompanied by prominent sea-level lowstands during the glacial intervals, when massive continental ice sheets extended from mountainous to lowland European areas. The retreat of the shoreline on the extensive present-day shallow continental shelf of the southern part of the British Isles induced the appearance of the ‘Fleuve Manche' palaeoriver, one of the largest systems that drained the European continent. Sedimentary records from the Bay of Biscay offer an independent record allowing the reconstruction of the freshwater and sediment discharges of the ‘Fleuve Manche', and the possibility of detecting the imprint of surrounding ice-sheet oscillations and attendant modification of hinterland drainage directions throughout the Pleistocene. For the last 1.2 Ma, the progressive development of extensive Pleistocene ice-sheets over Europe during cold periods favoured sedimentary transfers in the Bay of Biscay, particularly since MIS 12 when the British and Fennoscandian ice sheets merged in the North Sea for the first time, forcing the North Sea fluvial system to flow southwards through the Dover Strait, which opened 455 000 years ago according to our data. From this point onwards, the North Sea drainage, as well as meltwaters that flowed westwards along the southern margin of the Fennoscandian ice-sheet could drain into the Bay of Biscay, as reported through significant terrigenous supplies in the northern Bay of Biscay during the MIS 6 (ca.150 ka) and MIS 2 (ca.18 ka). We assume for example that sediment load delivered to the Bay of Biscay by the ‘Fleuve Manche' reached 130 M t yr-1 at time of the last melting of the European ice sheet ca. 18 000 years ago. On the whole, we demonstrate, for the studied period, that climate forcing strongly affects the sediment transfer into the northern Bay of Biscay and the turbiditic activity of the Celtic and Armorican turbidite systems. Finally, the recognition of melting events of the European ice sheets throughout the ... Doctoral or Postdoctoral Thesis Fennoscandian Ice Sheet Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Dover ENVELOPE(-55.753,-55.753,-83.777,-83.777) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
French |
topic |
Bay of Biscay sediment transfer turbidite systems climate ice sheets ‘Fleuve Manche' palaeoriver glacial Irish Sea system European fluvial system Land-sea correlations Golfe de Gascogne transferts sédimentaires systèmes turbiditiques Pléistocène climat glaciations calottes glaciaires Fleuve Manche système glaciaire de Mer d'Irlande réseau de drainage européen corrélations terre-mer [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy |
spellingShingle |
Bay of Biscay sediment transfer turbidite systems climate ice sheets ‘Fleuve Manche' palaeoriver glacial Irish Sea system European fluvial system Land-sea correlations Golfe de Gascogne transferts sédimentaires systèmes turbiditiques Pléistocène climat glaciations calottes glaciaires Fleuve Manche système glaciaire de Mer d'Irlande réseau de drainage européen corrélations terre-mer [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy Toucanne, Samuel Reconstruction of sediment transfers from the Irish Sea margin and the Fleuve Manche (English Channel) palaeoriver over the last climatic cycles |
topic_facet |
Bay of Biscay sediment transfer turbidite systems climate ice sheets ‘Fleuve Manche' palaeoriver glacial Irish Sea system European fluvial system Land-sea correlations Golfe de Gascogne transferts sédimentaires systèmes turbiditiques Pléistocène climat glaciations calottes glaciaires Fleuve Manche système glaciaire de Mer d'Irlande réseau de drainage européen corrélations terre-mer [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy |
description |
The Pleistocene has been period of fluctuating climate accompanied by prominent sea-level lowstands during the glacial intervals, when massive continental ice sheets extended from mountainous to lowland European areas. The retreat of the shoreline on the extensive present-day shallow continental shelf of the southern part of the British Isles induced the appearance of the ‘Fleuve Manche' palaeoriver, one of the largest systems that drained the European continent. Sedimentary records from the Bay of Biscay offer an independent record allowing the reconstruction of the freshwater and sediment discharges of the ‘Fleuve Manche', and the possibility of detecting the imprint of surrounding ice-sheet oscillations and attendant modification of hinterland drainage directions throughout the Pleistocene. For the last 1.2 Ma, the progressive development of extensive Pleistocene ice-sheets over Europe during cold periods favoured sedimentary transfers in the Bay of Biscay, particularly since MIS 12 when the British and Fennoscandian ice sheets merged in the North Sea for the first time, forcing the North Sea fluvial system to flow southwards through the Dover Strait, which opened 455 000 years ago according to our data. From this point onwards, the North Sea drainage, as well as meltwaters that flowed westwards along the southern margin of the Fennoscandian ice-sheet could drain into the Bay of Biscay, as reported through significant terrigenous supplies in the northern Bay of Biscay during the MIS 6 (ca.150 ka) and MIS 2 (ca.18 ka). We assume for example that sediment load delivered to the Bay of Biscay by the ‘Fleuve Manche' reached 130 M t yr-1 at time of the last melting of the European ice sheet ca. 18 000 years ago. On the whole, we demonstrate, for the studied period, that climate forcing strongly affects the sediment transfer into the northern Bay of Biscay and the turbiditic activity of the Celtic and Armorican turbidite systems. Finally, the recognition of melting events of the European ice sheets throughout the ... |
author2 |
Université Sciences et Technologies - Bordeaux 1 Unité de recherche Géosciences Marines (Ifremer) (GM) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) Université Sciences et Technologies - Bordeaux I Michel Cremer, Sébastien Zaragosi, Jean-François Bourillet |
format |
Doctoral or Postdoctoral Thesis |
author |
Toucanne, Samuel |
author_facet |
Toucanne, Samuel |
author_sort |
Toucanne, Samuel |
title |
Reconstruction of sediment transfers from the Irish Sea margin and the Fleuve Manche (English Channel) palaeoriver over the last climatic cycles |
title_short |
Reconstruction of sediment transfers from the Irish Sea margin and the Fleuve Manche (English Channel) palaeoriver over the last climatic cycles |
title_full |
Reconstruction of sediment transfers from the Irish Sea margin and the Fleuve Manche (English Channel) palaeoriver over the last climatic cycles |
title_fullStr |
Reconstruction of sediment transfers from the Irish Sea margin and the Fleuve Manche (English Channel) palaeoriver over the last climatic cycles |
title_full_unstemmed |
Reconstruction of sediment transfers from the Irish Sea margin and the Fleuve Manche (English Channel) palaeoriver over the last climatic cycles |
title_sort |
reconstruction of sediment transfers from the irish sea margin and the fleuve manche (english channel) palaeoriver over the last climatic cycles |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://tel.archives-ouvertes.fr/tel-00389403 https://tel.archives-ouvertes.fr/tel-00389403/document https://tel.archives-ouvertes.fr/tel-00389403/file/Toucanne2008.pdf |
long_lat |
ENVELOPE(-55.753,-55.753,-83.777,-83.777) |
geographic |
Dover |
geographic_facet |
Dover |
genre |
Fennoscandian Ice Sheet |
genre_facet |
Fennoscandian Ice Sheet |
op_source |
https://tel.archives-ouvertes.fr/tel-00389403 Minéralogie. Université Sciences et Technologies - Bordeaux I, 2008. Français |
op_relation |
tel-00389403 https://tel.archives-ouvertes.fr/tel-00389403 https://tel.archives-ouvertes.fr/tel-00389403/document https://tel.archives-ouvertes.fr/tel-00389403/file/Toucanne2008.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1765998597102370816 |