Late Quaternary high-resolution seismic stratigraphy and core-based paleoenvironmental reconstructions in Ona Basin, southwestern Scotia Sea (Antarctica)
The variability of sedimentation patterns and processes driven by late Quaternary glacial-interglacial paleoclimatic and paleoceanographic changes are investigated in Ona Basin, southwestern Scotia Sea. The interest of this area lies in the fact that the nearby Antarctic Peninsula has recorded extre...
Published in: | Marine Geology |
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2021
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Online Access: | http://hdl.handle.net/10261/278166 https://doi.org/10.1016/j.margeo.2021.106565 https://doi.org/10.13039/501100000780 https://doi.org/10.13039/501100004837 https://doi.org/10.13039/501100006393 |
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ftcsic:oai:digital.csic.es:10261/278166 2024-02-11T09:56:45+01:00 Late Quaternary high-resolution seismic stratigraphy and core-based paleoenvironmental reconstructions in Ona Basin, southwestern Scotia Sea (Antarctica) López-Quirós, Adrián Lobo, F. J. Duffy, Megan Leventer, Amy Evangelinos, Dimitris Escutia, Carlota Bohoyo, Fernando Ministerio de Ciencia e Innovación (España) European Commission Universidad de Granada 2021-07-09 http://hdl.handle.net/10261/278166 https://doi.org/10.1016/j.margeo.2021.106565 https://doi.org/10.13039/501100000780 https://doi.org/10.13039/501100004837 https://doi.org/10.13039/501100006393 unknown Elsevier BV #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MINECO//CTM2017-89711-C2-1/2-P Publisher's version http://dx.doi.org/10.1016/j.margeo.2021.106565 Sí doi:10.1016/j.margeo.2021.106565 issn: 0025-3227 Marine Geology 439 (2021) http://hdl.handle.net/10261/278166 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100004837 http://dx.doi.org/10.13039/501100006393 open Late Quaternary LGM Deglaciation Seismic stratigraphy Diatom assemblage Scotia Sea Antarctica artículo 2021 ftcsic https://doi.org/10.1016/j.margeo.2021.10656510.13039/50110000078010.13039/50110000483710.13039/501100006393 2024-01-16T11:28:24Z The variability of sedimentation patterns and processes driven by late Quaternary glacial-interglacial paleoclimatic and paleoceanographic changes are investigated in Ona Basin, southwestern Scotia Sea. The interest of this area lies in the fact that the nearby Antarctic Peninsula has recorded extreme climatic variability, and the Drake Passage-Scotia Sea oceanic domain is influenced by two major Southern Ocean water masses, the eastward-flowing Antarctic Circumpolar Current (ACC) and the westward-flowing Weddell Sea Deep Water (WSDW). These goals are achieved through the examination of a grid of very high-resolution sub-bottom profiles and two gravity cores collected in Ona Basin. Multi-proxy data derived from the gravity cores include C-derived ages, descriptions of sedimentary units and diatom assemblages, and continuous logging of physical properties and micro-XRF core scanning. The sub-surface seismic stratigraphy is composed of four seismic units (U4 to U1) with a dominant sub-parallel configuration, with local occurrence of wavy facies and intercalations of transparent seismic facies. Additionally, four sedimentary units were recognized through sediment core analysis from bottom to top: Unit IV is composed of slightly bioturbated diatom-rich mud and silty mud with sparse ice-rafted debris (IRDs); Unit III is composed of gravelly silty to sandy mud with large amounts of IRDs; Unit II mostly contains bioturbated diatomaceous mud; and Unit I is composed of diatom-rich silty to sandy mud. The highest diatom abundances are found in Unit II, whereas highly variable abundances are found in Unit IV. The most common diatoms are Fragilariopsis kerguelensis and Chaetoceros subg. Hyalochaete. Overall, these characteristics document a change in the depositional style from terrigenous during the Last Glacial Maximum (LGM) to hemipelagic sedimentation during the deglaciation. The high-resolution seismic stratigraphy analysis reveals significant fluctuations in the regional bottom-current patterns during the late ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Drake Passage Scotia Sea Southern Ocean Weddell Sea Digital.CSIC (Spanish National Research Council) Antarctic Southern Ocean Antarctic Peninsula Weddell Sea Drake Passage Scotia Sea Weddell Ona Basin ENVELOPE(-56.000,-56.000,-59.250,-59.250) Marine Geology 439 106565 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
topic |
Late Quaternary LGM Deglaciation Seismic stratigraphy Diatom assemblage Scotia Sea Antarctica |
spellingShingle |
Late Quaternary LGM Deglaciation Seismic stratigraphy Diatom assemblage Scotia Sea Antarctica López-Quirós, Adrián Lobo, F. J. Duffy, Megan Leventer, Amy Evangelinos, Dimitris Escutia, Carlota Bohoyo, Fernando Late Quaternary high-resolution seismic stratigraphy and core-based paleoenvironmental reconstructions in Ona Basin, southwestern Scotia Sea (Antarctica) |
topic_facet |
Late Quaternary LGM Deglaciation Seismic stratigraphy Diatom assemblage Scotia Sea Antarctica |
description |
The variability of sedimentation patterns and processes driven by late Quaternary glacial-interglacial paleoclimatic and paleoceanographic changes are investigated in Ona Basin, southwestern Scotia Sea. The interest of this area lies in the fact that the nearby Antarctic Peninsula has recorded extreme climatic variability, and the Drake Passage-Scotia Sea oceanic domain is influenced by two major Southern Ocean water masses, the eastward-flowing Antarctic Circumpolar Current (ACC) and the westward-flowing Weddell Sea Deep Water (WSDW). These goals are achieved through the examination of a grid of very high-resolution sub-bottom profiles and two gravity cores collected in Ona Basin. Multi-proxy data derived from the gravity cores include C-derived ages, descriptions of sedimentary units and diatom assemblages, and continuous logging of physical properties and micro-XRF core scanning. The sub-surface seismic stratigraphy is composed of four seismic units (U4 to U1) with a dominant sub-parallel configuration, with local occurrence of wavy facies and intercalations of transparent seismic facies. Additionally, four sedimentary units were recognized through sediment core analysis from bottom to top: Unit IV is composed of slightly bioturbated diatom-rich mud and silty mud with sparse ice-rafted debris (IRDs); Unit III is composed of gravelly silty to sandy mud with large amounts of IRDs; Unit II mostly contains bioturbated diatomaceous mud; and Unit I is composed of diatom-rich silty to sandy mud. The highest diatom abundances are found in Unit II, whereas highly variable abundances are found in Unit IV. The most common diatoms are Fragilariopsis kerguelensis and Chaetoceros subg. Hyalochaete. Overall, these characteristics document a change in the depositional style from terrigenous during the Last Glacial Maximum (LGM) to hemipelagic sedimentation during the deglaciation. The high-resolution seismic stratigraphy analysis reveals significant fluctuations in the regional bottom-current patterns during the late ... |
author2 |
Ministerio de Ciencia e Innovación (España) European Commission Universidad de Granada |
format |
Article in Journal/Newspaper |
author |
López-Quirós, Adrián Lobo, F. J. Duffy, Megan Leventer, Amy Evangelinos, Dimitris Escutia, Carlota Bohoyo, Fernando |
author_facet |
López-Quirós, Adrián Lobo, F. J. Duffy, Megan Leventer, Amy Evangelinos, Dimitris Escutia, Carlota Bohoyo, Fernando |
author_sort |
López-Quirós, Adrián |
title |
Late Quaternary high-resolution seismic stratigraphy and core-based paleoenvironmental reconstructions in Ona Basin, southwestern Scotia Sea (Antarctica) |
title_short |
Late Quaternary high-resolution seismic stratigraphy and core-based paleoenvironmental reconstructions in Ona Basin, southwestern Scotia Sea (Antarctica) |
title_full |
Late Quaternary high-resolution seismic stratigraphy and core-based paleoenvironmental reconstructions in Ona Basin, southwestern Scotia Sea (Antarctica) |
title_fullStr |
Late Quaternary high-resolution seismic stratigraphy and core-based paleoenvironmental reconstructions in Ona Basin, southwestern Scotia Sea (Antarctica) |
title_full_unstemmed |
Late Quaternary high-resolution seismic stratigraphy and core-based paleoenvironmental reconstructions in Ona Basin, southwestern Scotia Sea (Antarctica) |
title_sort |
late quaternary high-resolution seismic stratigraphy and core-based paleoenvironmental reconstructions in ona basin, southwestern scotia sea (antarctica) |
publisher |
Elsevier BV |
publishDate |
2021 |
url |
http://hdl.handle.net/10261/278166 https://doi.org/10.1016/j.margeo.2021.106565 https://doi.org/10.13039/501100000780 https://doi.org/10.13039/501100004837 https://doi.org/10.13039/501100006393 |
long_lat |
ENVELOPE(-56.000,-56.000,-59.250,-59.250) |
geographic |
Antarctic Southern Ocean Antarctic Peninsula Weddell Sea Drake Passage Scotia Sea Weddell Ona Basin |
geographic_facet |
Antarctic Southern Ocean Antarctic Peninsula Weddell Sea Drake Passage Scotia Sea Weddell Ona Basin |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Drake Passage Scotia Sea Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Drake Passage Scotia Sea Southern Ocean Weddell Sea |
op_relation |
#PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MINECO//CTM2017-89711-C2-1/2-P Publisher's version http://dx.doi.org/10.1016/j.margeo.2021.106565 Sí doi:10.1016/j.margeo.2021.106565 issn: 0025-3227 Marine Geology 439 (2021) http://hdl.handle.net/10261/278166 http://dx.doi.org/10.13039/501100000780 http://dx.doi.org/10.13039/501100004837 http://dx.doi.org/10.13039/501100006393 |
op_rights |
open |
op_doi |
https://doi.org/10.1016/j.margeo.2021.10656510.13039/50110000078010.13039/50110000483710.13039/501100006393 |
container_title |
Marine Geology |
container_volume |
439 |
container_start_page |
106565 |
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1790605595785560064 |