Description of a contourite depositional system on the Demerara Plateau: Results from geophysical data and sediment cores
International audience The Demerara Plateau, belonging to the passive transform margin of French Guiana, was investigated during the IGUANES cruise in 2013. The objectives of the cruise were to explore the poorly-known surficial sedimentary column overlying thick mass transport deposits as well as t...
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Online Access: | https://hal-univ-perp.archives-ouvertes.fr/hal-01336536 https://doi.org/10.1016/j.margeo.2016.01.003 |
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ftccsdartic:oai:HAL:hal-01336536v1 2023-05-15T17:13:52+02:00 Description of a contourite depositional system on the Demerara Plateau: Results from geophysical data and sediment cores Tallobre, Cédric Loncke, Lies Bassetti, Maria-Angela Giresse, Pierre Bayon, Germain Buscail, Roselyne Durrieu de Madron, Xavier Bourrin, François Vanhaesebroucke, Marc Sotin, Christine IGUANES Scientific Party, the Centre de Formation et de Recherche sur les Environnements Méditérranéens (CEFREM) Université de Perpignan Via Domitia (UPVD)-Centre National de la Recherche Scientifique (CNRS) Unité de recherche Géosciences Marines (Ifremer) (GM) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) 2016-08 https://hal-univ-perp.archives-ouvertes.fr/hal-01336536 https://doi.org/10.1016/j.margeo.2016.01.003 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.margeo.2016.01.003 hal-01336536 https://hal-univ-perp.archives-ouvertes.fr/hal-01336536 doi:10.1016/j.margeo.2016.01.003 ISSN: 0025-3227 Marine Geology https://hal-univ-perp.archives-ouvertes.fr/hal-01336536 Marine Geology, Elsevier, 2016, 378, pp.Pages 56-73. ⟨10.1016/j.margeo.2016.01.003⟩ Marginal plateau Contourite Comet tail Demerara Plateau [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2016 ftccsdartic https://doi.org/10.1016/j.margeo.2016.01.003 2021-04-03T23:20:26Z International audience The Demerara Plateau, belonging to the passive transform margin of French Guiana, was investigated during the IGUANES cruise in 2013. The objectives of the cruise were to explore the poorly-known surficial sedimentary column overlying thick mass transport deposits as well as to understand the factors controlling recent sedimentation. The presence of numerous bedforms at the seafloor was observed thanks to newly acquired IGUANES bathymetric, high resolution seismic and chirp data, while sediment cores allowed the characterization of the deposits covering the mass transport deposits. Modern oceanographic conditions were determined in situ, using mooring monitoring over a 10-month period. Our data indicate the presence of a Contourite Depositional System along the Demerara Plateau, most likely related to bottom current activity of the North Atlantic Deep Water (NADW). However, at the regional scale, large longitudinal waves parallel the NADW flow. Their shape and orientation seem to be inherited from interactions between bottom currents and paleomorphologies expressed at the top of mass transport deposits. Their evolution is possibly driven by the intensity of bottom current activity that might have changed over time. Overall, this work presents an integrated approach combining seismic and sedimentological evidence to study the processes at the origin of contourite formation in the Demerara Plateau. Other regional factors, such as local slope values and slope instability, also control sedimentation. Article in Journal/Newspaper NADW North Atlantic Deep Water North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Marine Geology 378 56 73 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Marginal plateau Contourite Comet tail Demerara Plateau [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Marginal plateau Contourite Comet tail Demerara Plateau [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Tallobre, Cédric Loncke, Lies Bassetti, Maria-Angela Giresse, Pierre Bayon, Germain Buscail, Roselyne Durrieu de Madron, Xavier Bourrin, François Vanhaesebroucke, Marc Sotin, Christine IGUANES Scientific Party, the Description of a contourite depositional system on the Demerara Plateau: Results from geophysical data and sediment cores |
topic_facet |
Marginal plateau Contourite Comet tail Demerara Plateau [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The Demerara Plateau, belonging to the passive transform margin of French Guiana, was investigated during the IGUANES cruise in 2013. The objectives of the cruise were to explore the poorly-known surficial sedimentary column overlying thick mass transport deposits as well as to understand the factors controlling recent sedimentation. The presence of numerous bedforms at the seafloor was observed thanks to newly acquired IGUANES bathymetric, high resolution seismic and chirp data, while sediment cores allowed the characterization of the deposits covering the mass transport deposits. Modern oceanographic conditions were determined in situ, using mooring monitoring over a 10-month period. Our data indicate the presence of a Contourite Depositional System along the Demerara Plateau, most likely related to bottom current activity of the North Atlantic Deep Water (NADW). However, at the regional scale, large longitudinal waves parallel the NADW flow. Their shape and orientation seem to be inherited from interactions between bottom currents and paleomorphologies expressed at the top of mass transport deposits. Their evolution is possibly driven by the intensity of bottom current activity that might have changed over time. Overall, this work presents an integrated approach combining seismic and sedimentological evidence to study the processes at the origin of contourite formation in the Demerara Plateau. Other regional factors, such as local slope values and slope instability, also control sedimentation. |
author2 |
Centre de Formation et de Recherche sur les Environnements Méditérranéens (CEFREM) Université de Perpignan Via Domitia (UPVD)-Centre National de la Recherche Scientifique (CNRS) Unité de recherche Géosciences Marines (Ifremer) (GM) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) |
format |
Article in Journal/Newspaper |
author |
Tallobre, Cédric Loncke, Lies Bassetti, Maria-Angela Giresse, Pierre Bayon, Germain Buscail, Roselyne Durrieu de Madron, Xavier Bourrin, François Vanhaesebroucke, Marc Sotin, Christine IGUANES Scientific Party, the |
author_facet |
Tallobre, Cédric Loncke, Lies Bassetti, Maria-Angela Giresse, Pierre Bayon, Germain Buscail, Roselyne Durrieu de Madron, Xavier Bourrin, François Vanhaesebroucke, Marc Sotin, Christine IGUANES Scientific Party, the |
author_sort |
Tallobre, Cédric |
title |
Description of a contourite depositional system on the Demerara Plateau: Results from geophysical data and sediment cores |
title_short |
Description of a contourite depositional system on the Demerara Plateau: Results from geophysical data and sediment cores |
title_full |
Description of a contourite depositional system on the Demerara Plateau: Results from geophysical data and sediment cores |
title_fullStr |
Description of a contourite depositional system on the Demerara Plateau: Results from geophysical data and sediment cores |
title_full_unstemmed |
Description of a contourite depositional system on the Demerara Plateau: Results from geophysical data and sediment cores |
title_sort |
description of a contourite depositional system on the demerara plateau: results from geophysical data and sediment cores |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal-univ-perp.archives-ouvertes.fr/hal-01336536 https://doi.org/10.1016/j.margeo.2016.01.003 |
genre |
NADW North Atlantic Deep Water North Atlantic |
genre_facet |
NADW North Atlantic Deep Water North Atlantic |
op_source |
ISSN: 0025-3227 Marine Geology https://hal-univ-perp.archives-ouvertes.fr/hal-01336536 Marine Geology, Elsevier, 2016, 378, pp.Pages 56-73. ⟨10.1016/j.margeo.2016.01.003⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.margeo.2016.01.003 hal-01336536 https://hal-univ-perp.archives-ouvertes.fr/hal-01336536 doi:10.1016/j.margeo.2016.01.003 |
op_doi |
https://doi.org/10.1016/j.margeo.2016.01.003 |
container_title |
Marine Geology |
container_volume |
378 |
container_start_page |
56 |
op_container_end_page |
73 |
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1766071053015056384 |