Cenozoic paleoenvironmental and paleoceanographic reconstructions in the Drake-Scotia Gateway
The role that the opening and deepening of the Drake Passage and the Scotia Sea played in the development of the first Cenozoic continental ice sheet in Antarctica and the onset of the Antarctic Circumpolar Current (ACC) during the Eocene-Oligocene Transition (EOT) is still uncertain. This limited k...
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Universidad de Granada
2020
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Online Access: | https://hdl.handle.net/10481/80946 |
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ftunivgranada:oai:digibug.ugr.es:10481/80946 2023-05-15T13:47:03+02:00 Cenozoic paleoenvironmental and paleoceanographic reconstructions in the Drake-Scotia Gateway López Quirós, Adrián Escutia Dotti, Carlota Lobo Sánchez, Francisco José Universidad de Granada. Programa de Doctorado en Ciencias de la Tierra; Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR) 2020 application/pdf https://hdl.handle.net/10481/80946 eng eng Universidad de Granada López Quirós, Adrián. Cenozoic paleoenvironmental and paleoceanographic reconstructions in the Drake-Scotia Gateway. Granada: Universidad de Granada, 2020. [https://hdl.handle.net/10481/80946] 9788411177603 https://hdl.handle.net/10481/80946 Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess info:eu-repo/semantics/doctoralThesis info:eu-repo/semantics/publishedVersion 2020 ftunivgranada 2023-04-04T23:23:53Z The role that the opening and deepening of the Drake Passage and the Scotia Sea played in the development of the first Cenozoic continental ice sheet in Antarctica and the onset of the Antarctic Circumpolar Current (ACC) during the Eocene-Oligocene Transition (EOT) is still uncertain. This limited knowledge stems from the poor age control of the separation of the different continental blocks leading to the opening of the Drake Passage; in fact, proposed ages for this opening range from 40 to 17 million years (Ma). Along with the progressive opening of Drake Passage, a number of small sedimentary basins developed in the southern Scotia Sea. These basins had a major impact on the establishment on deep-water circulation patterns due to their role as principal conduits for the exit cold Antarctic waters from the Weddell Sea (i.e., the Weddell Sea Deep Water: WSDW) and their interaction with the different fronts of the ACC in the Scotia Sea. In spite of this importance, the knowledge of the distribution and temporal variability of the water masses in the Scotia Sea is very limited. This PhD Thesis aims to: (1) reconstruct late Eocene to early Oligocene paleoenvironmental changes at the South Orkney Microcontinent (SOM) and their relation to the tectonic and climatic evolution of the Drake Passage-Scotia Sea; (2) reconstruct the recent deep-water sedimentation patterns in the western Scotia Sea to asses the paths and interactions between major bottom current patterns once the ACC and the WSDW were fully developed. These two objectives target two different temporal windows that represent the two end-member situations on the establishment of bottom currents around Antarctica, and their eventual links with climatic changes. To achieve these aims, we have conducted a suite of analysis in marine sediment cores recovered in the SOM (ODP Site 696B), and using geophysical and hydrographic datasets collected in the westernmost Scotia Sea basin (Ona Basin). Firstly, this PhD Thesis shows that during the late Eocene (~37.6–35.5 ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Antarctica Drake Passage Ice Sheet Scotia Sea Weddell Sea DIGIBUG: Repositorio Institucional de la Universidad de Granada Antarctic The Antarctic Weddell Sea Drake Passage Scotia Sea Weddell Ona Basin ENVELOPE(-56.000,-56.000,-59.250,-59.250) |
institution |
Open Polar |
collection |
DIGIBUG: Repositorio Institucional de la Universidad de Granada |
op_collection_id |
ftunivgranada |
language |
English |
description |
The role that the opening and deepening of the Drake Passage and the Scotia Sea played in the development of the first Cenozoic continental ice sheet in Antarctica and the onset of the Antarctic Circumpolar Current (ACC) during the Eocene-Oligocene Transition (EOT) is still uncertain. This limited knowledge stems from the poor age control of the separation of the different continental blocks leading to the opening of the Drake Passage; in fact, proposed ages for this opening range from 40 to 17 million years (Ma). Along with the progressive opening of Drake Passage, a number of small sedimentary basins developed in the southern Scotia Sea. These basins had a major impact on the establishment on deep-water circulation patterns due to their role as principal conduits for the exit cold Antarctic waters from the Weddell Sea (i.e., the Weddell Sea Deep Water: WSDW) and their interaction with the different fronts of the ACC in the Scotia Sea. In spite of this importance, the knowledge of the distribution and temporal variability of the water masses in the Scotia Sea is very limited. This PhD Thesis aims to: (1) reconstruct late Eocene to early Oligocene paleoenvironmental changes at the South Orkney Microcontinent (SOM) and their relation to the tectonic and climatic evolution of the Drake Passage-Scotia Sea; (2) reconstruct the recent deep-water sedimentation patterns in the western Scotia Sea to asses the paths and interactions between major bottom current patterns once the ACC and the WSDW were fully developed. These two objectives target two different temporal windows that represent the two end-member situations on the establishment of bottom currents around Antarctica, and their eventual links with climatic changes. To achieve these aims, we have conducted a suite of analysis in marine sediment cores recovered in the SOM (ODP Site 696B), and using geophysical and hydrographic datasets collected in the westernmost Scotia Sea basin (Ona Basin). Firstly, this PhD Thesis shows that during the late Eocene (~37.6–35.5 ... |
author2 |
Escutia Dotti, Carlota Lobo Sánchez, Francisco José Universidad de Granada. Programa de Doctorado en Ciencias de la Tierra; Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR) |
format |
Doctoral or Postdoctoral Thesis |
author |
López Quirós, Adrián |
spellingShingle |
López Quirós, Adrián Cenozoic paleoenvironmental and paleoceanographic reconstructions in the Drake-Scotia Gateway |
author_facet |
López Quirós, Adrián |
author_sort |
López Quirós, Adrián |
title |
Cenozoic paleoenvironmental and paleoceanographic reconstructions in the Drake-Scotia Gateway |
title_short |
Cenozoic paleoenvironmental and paleoceanographic reconstructions in the Drake-Scotia Gateway |
title_full |
Cenozoic paleoenvironmental and paleoceanographic reconstructions in the Drake-Scotia Gateway |
title_fullStr |
Cenozoic paleoenvironmental and paleoceanographic reconstructions in the Drake-Scotia Gateway |
title_full_unstemmed |
Cenozoic paleoenvironmental and paleoceanographic reconstructions in the Drake-Scotia Gateway |
title_sort |
cenozoic paleoenvironmental and paleoceanographic reconstructions in the drake-scotia gateway |
publisher |
Universidad de Granada |
publishDate |
2020 |
url |
https://hdl.handle.net/10481/80946 |
long_lat |
ENVELOPE(-56.000,-56.000,-59.250,-59.250) |
geographic |
Antarctic The Antarctic Weddell Sea Drake Passage Scotia Sea Weddell Ona Basin |
geographic_facet |
Antarctic The Antarctic Weddell Sea Drake Passage Scotia Sea Weddell Ona Basin |
genre |
Antarc* Antarctic Antarctica Drake Passage Ice Sheet Scotia Sea Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Drake Passage Ice Sheet Scotia Sea Weddell Sea |
op_relation |
López Quirós, Adrián. Cenozoic paleoenvironmental and paleoceanographic reconstructions in the Drake-Scotia Gateway. Granada: Universidad de Granada, 2020. [https://hdl.handle.net/10481/80946] 9788411177603 https://hdl.handle.net/10481/80946 |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
_version_ |
1766246254080163840 |