Description of a contourite depositional system on the Demerara Plateau: Results from geophysical data and sediment cores
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 factor...
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fttriple:oai:gotriple.eu:10670/1.brzd3r 2023-05-15T17:13:51+02:00 Description of a contourite depositional system on the Demerara Plateau: Results from geophysical data and sediment cores Tallobre, Cedric Loncke, Lies Bassetti, Maria-angela Giresse, Pierre Bayon, Germain Buscail, Roselyne De Madron, Xavier Durrieu Bourrin, Francois Vanhaesebroucke, Marc Sotin, Christine https://doi.org/10.1016/j.margeo.2016.01.003 https://archimer.ifremer.fr/doc/00308/41957/41220.pdf https://archimer.ifremer.fr/doc/00308/41957/ en eng Elsevier Science Bv doi:10.1016/j.margeo.2016.01.003 10670/1.brzd3r https://archimer.ifremer.fr/doc/00308/41957/41220.pdf https://archimer.ifremer.fr/doc/00308/41957/ Archimer, archive institutionnelle de l'Ifremer Marine Geology (0025-3227) (Elsevier Science Bv), 2016-08 , Vol. 378 , P. 56-73 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1016/j.margeo.2016.01.003 2023-01-22T17:01:30Z 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. Text NADW North Atlantic Deep Water North Atlantic Unknown Marine Geology 378 56 73 |
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geo envir |
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geo envir Tallobre, Cedric Loncke, Lies Bassetti, Maria-angela Giresse, Pierre Bayon, Germain Buscail, Roselyne De Madron, Xavier Durrieu Bourrin, Francois Vanhaesebroucke, Marc Sotin, Christine Description of a contourite depositional system on the Demerara Plateau: Results from geophysical data and sediment cores |
topic_facet |
geo envir |
description |
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. |
format |
Text |
author |
Tallobre, Cedric Loncke, Lies Bassetti, Maria-angela Giresse, Pierre Bayon, Germain Buscail, Roselyne De Madron, Xavier Durrieu Bourrin, Francois Vanhaesebroucke, Marc Sotin, Christine |
author_facet |
Tallobre, Cedric Loncke, Lies Bassetti, Maria-angela Giresse, Pierre Bayon, Germain Buscail, Roselyne De Madron, Xavier Durrieu Bourrin, Francois Vanhaesebroucke, Marc Sotin, Christine |
author_sort |
Tallobre, Cedric |
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 |
Elsevier Science Bv |
url |
https://doi.org/10.1016/j.margeo.2016.01.003 https://archimer.ifremer.fr/doc/00308/41957/41220.pdf https://archimer.ifremer.fr/doc/00308/41957/ |
genre |
NADW North Atlantic Deep Water North Atlantic |
genre_facet |
NADW North Atlantic Deep Water North Atlantic |
op_source |
Archimer, archive institutionnelle de l'Ifremer Marine Geology (0025-3227) (Elsevier Science Bv), 2016-08 , Vol. 378 , P. 56-73 |
op_relation |
doi:10.1016/j.margeo.2016.01.003 10670/1.brzd3r https://archimer.ifremer.fr/doc/00308/41957/41220.pdf https://archimer.ifremer.fr/doc/00308/41957/ |
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 |
_version_ |
1766071049451995136 |