Reconstruction of the formation history of the Darwin Mounds, N Rockall Trough: How the dynamics of a sandy contourite affected cold-water coral growth
International audience Cold-water coral mounds, formed through a feed-back process of cold-water coral growth and sediment baffling, have been studied all along the NE Atlantic continental margin. However, major questions remain concerning their formation history, especially their initiation and ear...
Published in: | Marine Geology |
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Main Authors: | , , , , |
Other Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2016
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Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-01587334 https://hal.archives-ouvertes.fr/hal-01587334/document https://hal.archives-ouvertes.fr/hal-01587334/file/01587334Y.pdf https://doi.org/10.1016/j.margeo.2015.12.001 |
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ftccsdartic:oai:HAL:hal-01587334v1 |
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record_format |
openpolar |
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 |
Lophelia pertusa Cold-water coral mounds North-east Atlantic Darwin Mounds Contourite CT-scan [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Lophelia pertusa Cold-water coral mounds North-east Atlantic Darwin Mounds Contourite CT-scan [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Victorero, Lissette Blamart, Dominique Pons-Branchu, Edwige Mavrogordato, Mark N. Huvenne, Veerle A.I. Reconstruction of the formation history of the Darwin Mounds, N Rockall Trough: How the dynamics of a sandy contourite affected cold-water coral growth |
topic_facet |
Lophelia pertusa Cold-water coral mounds North-east Atlantic Darwin Mounds Contourite CT-scan [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Cold-water coral mounds, formed through a feed-back process of cold-water coral growth and sediment baffling, have been studied all along the NE Atlantic continental margin. However, major questions remain concerning their formation history, especially their initiation and early development in relation to the surrounding sediment dynamics. For the first time, two small mounds located in a sandy contourite have been cored from the top to mound base: here, the formation history of the Darwin Mounds, located in the Northern Rockall Trough was investigated and reconstructed from two piston cores using a multidisciplinary approach. This consisted of CT-scanning for quantifying coral density changes with depth, grain-size analysis to obtain the hydrodynamic trends and radiocarbon and U-series dating to place the results into a wider paleoceanographic context. The results show that the Darwin Mounds formed during the early Holocene (~ 10 ka BP) through sediment baffling, mainly by Lophelia pertusa. The initiation of both mounds shows a similar pattern of increased current velocities resulting in coarser sediment deposition and a relatively high coral density with a peak of 23 vol%. The mound growth was rapid between ~ 10–9.7 ka BP (up to 277 cm ka− 1 in one of the mounds), with further vibrant growth periods around ~ 8.8 ka BP, 6.5 ka BP and 3.4 ka BP. The demise of the mounds ca. ~ 3 ka BP was likely caused by an intensification in bottom current velocities causing a hostile environment for coral growth in the contourite setting. In a wider context, the development of the Darwin Mounds appears to have responded to the relative strength and position of the Subpolar Gyre, which affected food supply to the corals, sedimentation rates, current speeds and other water mass properties in the area. |
author2 |
Ocean and Earth Science Southampton University of Southampton-National Oceanography Centre (NOC) Paléocéanographie (PALEOCEAN) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Géochrononologie Traceurs Archéométrie (GEOTRAC) University of Southampton National Oceanography Centre Southampton (NOC) |
format |
Article in Journal/Newspaper |
author |
Victorero, Lissette Blamart, Dominique Pons-Branchu, Edwige Mavrogordato, Mark N. Huvenne, Veerle A.I. |
author_facet |
Victorero, Lissette Blamart, Dominique Pons-Branchu, Edwige Mavrogordato, Mark N. Huvenne, Veerle A.I. |
author_sort |
Victorero, Lissette |
title |
Reconstruction of the formation history of the Darwin Mounds, N Rockall Trough: How the dynamics of a sandy contourite affected cold-water coral growth |
title_short |
Reconstruction of the formation history of the Darwin Mounds, N Rockall Trough: How the dynamics of a sandy contourite affected cold-water coral growth |
title_full |
Reconstruction of the formation history of the Darwin Mounds, N Rockall Trough: How the dynamics of a sandy contourite affected cold-water coral growth |
title_fullStr |
Reconstruction of the formation history of the Darwin Mounds, N Rockall Trough: How the dynamics of a sandy contourite affected cold-water coral growth |
title_full_unstemmed |
Reconstruction of the formation history of the Darwin Mounds, N Rockall Trough: How the dynamics of a sandy contourite affected cold-water coral growth |
title_sort |
reconstruction of the formation history of the darwin mounds, n rockall trough: how the dynamics of a sandy contourite affected cold-water coral growth |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.archives-ouvertes.fr/hal-01587334 https://hal.archives-ouvertes.fr/hal-01587334/document https://hal.archives-ouvertes.fr/hal-01587334/file/01587334Y.pdf https://doi.org/10.1016/j.margeo.2015.12.001 |
long_lat |
ENVELOPE(-15.036,-15.036,53.825,53.825) |
geographic |
Rockall Trough |
geographic_facet |
Rockall Trough |
genre |
Lophelia pertusa North East Atlantic |
genre_facet |
Lophelia pertusa North East Atlantic |
op_source |
ISSN: 0025-3227 Marine Geology https://hal.archives-ouvertes.fr/hal-01587334 Marine Geology, Elsevier, 2016, 378 (9), pp.186 - 195. ⟨10.1016/j.margeo.2015.12.001⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.margeo.2015.12.001 hal-01587334 https://hal.archives-ouvertes.fr/hal-01587334 https://hal.archives-ouvertes.fr/hal-01587334/document https://hal.archives-ouvertes.fr/hal-01587334/file/01587334Y.pdf doi:10.1016/j.margeo.2015.12.001 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.margeo.2015.12.001 |
container_title |
Marine Geology |
container_volume |
378 |
container_start_page |
186 |
op_container_end_page |
195 |
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1766064525115654144 |
spelling |
ftccsdartic:oai:HAL:hal-01587334v1 2023-05-15T17:08:42+02:00 Reconstruction of the formation history of the Darwin Mounds, N Rockall Trough: How the dynamics of a sandy contourite affected cold-water coral growth Victorero, Lissette Blamart, Dominique Pons-Branchu, Edwige Mavrogordato, Mark N. Huvenne, Veerle A.I. Ocean and Earth Science Southampton University of Southampton-National Oceanography Centre (NOC) Paléocéanographie (PALEOCEAN) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Géochrononologie Traceurs Archéométrie (GEOTRAC) University of Southampton National Oceanography Centre Southampton (NOC) 2016 https://hal.archives-ouvertes.fr/hal-01587334 https://hal.archives-ouvertes.fr/hal-01587334/document https://hal.archives-ouvertes.fr/hal-01587334/file/01587334Y.pdf https://doi.org/10.1016/j.margeo.2015.12.001 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.margeo.2015.12.001 hal-01587334 https://hal.archives-ouvertes.fr/hal-01587334 https://hal.archives-ouvertes.fr/hal-01587334/document https://hal.archives-ouvertes.fr/hal-01587334/file/01587334Y.pdf doi:10.1016/j.margeo.2015.12.001 info:eu-repo/semantics/OpenAccess ISSN: 0025-3227 Marine Geology https://hal.archives-ouvertes.fr/hal-01587334 Marine Geology, Elsevier, 2016, 378 (9), pp.186 - 195. ⟨10.1016/j.margeo.2015.12.001⟩ Lophelia pertusa Cold-water coral mounds North-east Atlantic Darwin Mounds Contourite CT-scan [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [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.2015.12.001 2021-12-19T00:03:02Z International audience Cold-water coral mounds, formed through a feed-back process of cold-water coral growth and sediment baffling, have been studied all along the NE Atlantic continental margin. However, major questions remain concerning their formation history, especially their initiation and early development in relation to the surrounding sediment dynamics. For the first time, two small mounds located in a sandy contourite have been cored from the top to mound base: here, the formation history of the Darwin Mounds, located in the Northern Rockall Trough was investigated and reconstructed from two piston cores using a multidisciplinary approach. This consisted of CT-scanning for quantifying coral density changes with depth, grain-size analysis to obtain the hydrodynamic trends and radiocarbon and U-series dating to place the results into a wider paleoceanographic context. The results show that the Darwin Mounds formed during the early Holocene (~ 10 ka BP) through sediment baffling, mainly by Lophelia pertusa. The initiation of both mounds shows a similar pattern of increased current velocities resulting in coarser sediment deposition and a relatively high coral density with a peak of 23 vol%. The mound growth was rapid between ~ 10–9.7 ka BP (up to 277 cm ka− 1 in one of the mounds), with further vibrant growth periods around ~ 8.8 ka BP, 6.5 ka BP and 3.4 ka BP. The demise of the mounds ca. ~ 3 ka BP was likely caused by an intensification in bottom current velocities causing a hostile environment for coral growth in the contourite setting. In a wider context, the development of the Darwin Mounds appears to have responded to the relative strength and position of the Subpolar Gyre, which affected food supply to the corals, sedimentation rates, current speeds and other water mass properties in the area. Article in Journal/Newspaper Lophelia pertusa North East Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Rockall Trough ENVELOPE(-15.036,-15.036,53.825,53.825) Marine Geology 378 186 195 |