Sedimentary evolution of the Le Danois contourite drift systems (southern Bay of Biscay, NE Atlantic) : a reconstruction of the Atlantic Mediterranean Water circulation since the Pliocene
The evolution of the Le Danois contourite depositional systems (CDS) during the Pliocene and Quaternary was investigated based on high-resolution seismic reflection data. From old to young, six seismic units (U1-U6) bounded by major discontinuities (H1-H6) were identified. Regarding variations of th...
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Online Access: | https://biblio.ugent.be/publication/8670226 http://hdl.handle.net/1854/LU-8670226 https://doi.org/10.1016/j.margeo.2020.106217 https://biblio.ugent.be/publication/8670226/file/8670242 |
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ftunivgent:oai:archive.ugent.be:8670226 2023-06-11T04:15:05+02:00 Sedimentary evolution of the Le Danois contourite drift systems (southern Bay of Biscay, NE Atlantic) : a reconstruction of the Atlantic Mediterranean Water circulation since the Pliocene Liu, Shan Hernández-Molina, F. Javier Van Rooij, David Ercilla, Gemma 2020 application/pdf https://biblio.ugent.be/publication/8670226 http://hdl.handle.net/1854/LU-8670226 https://doi.org/10.1016/j.margeo.2020.106217 https://biblio.ugent.be/publication/8670226/file/8670242 eng eng https://biblio.ugent.be/publication/8670226 http://hdl.handle.net/1854/LU-8670226 http://dx.doi.org/10.1016/j.margeo.2020.106217 https://biblio.ugent.be/publication/8670226/file/8670242 No license (in copyright) info:eu-repo/semantics/restrictedAccess MARINE GEOLOGY ISSN: 0025-3227 ISSN: 1872-6151 Earth and Environmental Sciences Geology Geochemistry and Petrology Oceanography eismic stratigraphy Contourite depositional system Bottom currents Continental margin evolution Southern Bay of Biscay OUTFLOW WATER BOTTOM-CURRENT CONTINENTAL-MARGIN EARLY-PLEISTOCENE STACKING PATTERN SEISMIC EVIDENCE ALGARVE MARGIN ROCKALL TROUGH SW IBERIA WAVES journalArticle info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2020 ftunivgent https://doi.org/10.1016/j.margeo.2020.106217 2023-05-10T22:50:36Z The evolution of the Le Danois contourite depositional systems (CDS) during the Pliocene and Quaternary was investigated based on high-resolution seismic reflection data. From old to young, six seismic units (U1-U6) bounded by major discontinuities (H1-H6) were identified. Regarding variations of the bottom-current circulation, four evolution stages of the Le Danois CDS were identified, including onset (similar to 5.3 to 3.5-3.0 Ma), initial (3.5-3.0 to 2.5-2.1 Ma), intermediate (2.5-2.1 to 0.9-0.7 Ma) and drift-growth (0.9-0.7 Ma to present day) stages. The CDS associated with the Atlantic Mediterranean Water (AMW) along the middle continental slope initiated at similar to 3.5-3 Ma and was widely built after the Mid-Pleistocene Transition (MPT; 0.9-07 Ma). At a shallower water depth, a second CDS associated with the Eastern North Atlantic Central Water (ENACW) started to develop from the late Quaternary (similar to 0.47 Ma) onwards. In the AMW-related drift system, the Le Danois Drift was generated both under glacial and interglacial climatic oscilations. Repeated internal structures in unit 5 that consist of acoustically transparent lower parts, moderate amplitude upper parts and high amplitude erosional surfaces at the top, are compared with interglacial/glacial cycles since the middle Pleistocene to the present day. These cyclic features suggest coarsening-upward sequences of the Le Danois Drift and processes related to enhanced AMW during glacial stages. The estimated sedimentation rate of the Le Danois CDS reached a maximum during the MPT (at least similar to 27 cm/ky) and then decreased until present-day (similar to 5 cm/ky). Variations of sedimentary stacking patterns and processes of the Le Danois CDS imply full domination of the intermediate water mass along the central Atlantic and southwest European continental slopes from the late Pliocene (similar to 3.5-3.0 Ma) onwards. Article in Journal/Newspaper North Atlantic Ghent University Academic Bibliography Rockall Trough ENVELOPE(-15.036,-15.036,53.825,53.825) Marine Geology 427 106217 |
institution |
Open Polar |
collection |
Ghent University Academic Bibliography |
op_collection_id |
ftunivgent |
language |
English |
topic |
Earth and Environmental Sciences Geology Geochemistry and Petrology Oceanography eismic stratigraphy Contourite depositional system Bottom currents Continental margin evolution Southern Bay of Biscay OUTFLOW WATER BOTTOM-CURRENT CONTINENTAL-MARGIN EARLY-PLEISTOCENE STACKING PATTERN SEISMIC EVIDENCE ALGARVE MARGIN ROCKALL TROUGH SW IBERIA WAVES |
spellingShingle |
Earth and Environmental Sciences Geology Geochemistry and Petrology Oceanography eismic stratigraphy Contourite depositional system Bottom currents Continental margin evolution Southern Bay of Biscay OUTFLOW WATER BOTTOM-CURRENT CONTINENTAL-MARGIN EARLY-PLEISTOCENE STACKING PATTERN SEISMIC EVIDENCE ALGARVE MARGIN ROCKALL TROUGH SW IBERIA WAVES Liu, Shan Hernández-Molina, F. Javier Van Rooij, David Ercilla, Gemma Sedimentary evolution of the Le Danois contourite drift systems (southern Bay of Biscay, NE Atlantic) : a reconstruction of the Atlantic Mediterranean Water circulation since the Pliocene |
topic_facet |
Earth and Environmental Sciences Geology Geochemistry and Petrology Oceanography eismic stratigraphy Contourite depositional system Bottom currents Continental margin evolution Southern Bay of Biscay OUTFLOW WATER BOTTOM-CURRENT CONTINENTAL-MARGIN EARLY-PLEISTOCENE STACKING PATTERN SEISMIC EVIDENCE ALGARVE MARGIN ROCKALL TROUGH SW IBERIA WAVES |
description |
The evolution of the Le Danois contourite depositional systems (CDS) during the Pliocene and Quaternary was investigated based on high-resolution seismic reflection data. From old to young, six seismic units (U1-U6) bounded by major discontinuities (H1-H6) were identified. Regarding variations of the bottom-current circulation, four evolution stages of the Le Danois CDS were identified, including onset (similar to 5.3 to 3.5-3.0 Ma), initial (3.5-3.0 to 2.5-2.1 Ma), intermediate (2.5-2.1 to 0.9-0.7 Ma) and drift-growth (0.9-0.7 Ma to present day) stages. The CDS associated with the Atlantic Mediterranean Water (AMW) along the middle continental slope initiated at similar to 3.5-3 Ma and was widely built after the Mid-Pleistocene Transition (MPT; 0.9-07 Ma). At a shallower water depth, a second CDS associated with the Eastern North Atlantic Central Water (ENACW) started to develop from the late Quaternary (similar to 0.47 Ma) onwards. In the AMW-related drift system, the Le Danois Drift was generated both under glacial and interglacial climatic oscilations. Repeated internal structures in unit 5 that consist of acoustically transparent lower parts, moderate amplitude upper parts and high amplitude erosional surfaces at the top, are compared with interglacial/glacial cycles since the middle Pleistocene to the present day. These cyclic features suggest coarsening-upward sequences of the Le Danois Drift and processes related to enhanced AMW during glacial stages. The estimated sedimentation rate of the Le Danois CDS reached a maximum during the MPT (at least similar to 27 cm/ky) and then decreased until present-day (similar to 5 cm/ky). Variations of sedimentary stacking patterns and processes of the Le Danois CDS imply full domination of the intermediate water mass along the central Atlantic and southwest European continental slopes from the late Pliocene (similar to 3.5-3.0 Ma) onwards. |
format |
Article in Journal/Newspaper |
author |
Liu, Shan Hernández-Molina, F. Javier Van Rooij, David Ercilla, Gemma |
author_facet |
Liu, Shan Hernández-Molina, F. Javier Van Rooij, David Ercilla, Gemma |
author_sort |
Liu, Shan |
title |
Sedimentary evolution of the Le Danois contourite drift systems (southern Bay of Biscay, NE Atlantic) : a reconstruction of the Atlantic Mediterranean Water circulation since the Pliocene |
title_short |
Sedimentary evolution of the Le Danois contourite drift systems (southern Bay of Biscay, NE Atlantic) : a reconstruction of the Atlantic Mediterranean Water circulation since the Pliocene |
title_full |
Sedimentary evolution of the Le Danois contourite drift systems (southern Bay of Biscay, NE Atlantic) : a reconstruction of the Atlantic Mediterranean Water circulation since the Pliocene |
title_fullStr |
Sedimentary evolution of the Le Danois contourite drift systems (southern Bay of Biscay, NE Atlantic) : a reconstruction of the Atlantic Mediterranean Water circulation since the Pliocene |
title_full_unstemmed |
Sedimentary evolution of the Le Danois contourite drift systems (southern Bay of Biscay, NE Atlantic) : a reconstruction of the Atlantic Mediterranean Water circulation since the Pliocene |
title_sort |
sedimentary evolution of the le danois contourite drift systems (southern bay of biscay, ne atlantic) : a reconstruction of the atlantic mediterranean water circulation since the pliocene |
publishDate |
2020 |
url |
https://biblio.ugent.be/publication/8670226 http://hdl.handle.net/1854/LU-8670226 https://doi.org/10.1016/j.margeo.2020.106217 https://biblio.ugent.be/publication/8670226/file/8670242 |
long_lat |
ENVELOPE(-15.036,-15.036,53.825,53.825) |
geographic |
Rockall Trough |
geographic_facet |
Rockall Trough |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
MARINE GEOLOGY ISSN: 0025-3227 ISSN: 1872-6151 |
op_relation |
https://biblio.ugent.be/publication/8670226 http://hdl.handle.net/1854/LU-8670226 http://dx.doi.org/10.1016/j.margeo.2020.106217 https://biblio.ugent.be/publication/8670226/file/8670242 |
op_rights |
No license (in copyright) info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.margeo.2020.106217 |
container_title |
Marine Geology |
container_volume |
427 |
container_start_page |
106217 |
_version_ |
1768371609511395328 |