Depositional processes and growth patterns of isolated oceanic basins: the Protector and the Pirie basins ofthe Southern Scotia Sea (Antarctica)
Sedimentary processes in small, isolated oceanic basins that form adjacent to continental margins but detached from continents remain poorly understood. This work describes two such basins located in the southern Scotia Sea, the Protector and Pirie basins. We analysed multichannel seismic profiles t...
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Format: | Article in Journal/Newspaper |
Language: | English |
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Centro Oceanográfico de Málaga
2014
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Online Access: | http://hdl.handle.net/10508/9652 https://doi.org/10.1016/j.margeo.2014.08.001 |
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ftieo:oai:repositorio.ieo.es:10508/9652 2023-05-15T13:41:24+02:00 Depositional processes and growth patterns of isolated oceanic basins: the Protector and the Pirie basins ofthe Southern Scotia Sea (Antarctica) Pérez, L.F. Maldonado, A. (Antonio) Bohoyo, F. Hernández-Molina, F.J. (Francisco Javier) Vázquez, J.T. (Juan Tomás) Lobo, F.J. (Francisco J.) Martos, Y.M. Antarctic Ocean Antarctic Atlantic Scotia Sea 2014-11-01 http://hdl.handle.net/10508/9652 https://doi.org/10.1016/j.margeo.2014.08.001 eng eng Centro Oceanográfico de Málaga 0025-3227 http://hdl.handle.net/10508/9652 Marine Geology, 357. 2014: 163-181 doi:10.1016/j.margeo.2014.08.001 Attribution-NonCommercial-NoDerivs 3.0 Spain http://creativecommons.org/licenses/by-nc-nd/3.0/es/ openAccess CC-BY-NC-ND Isolated deeo oceanic basins Tectonics Seismic stratigraphy Deep-water circulation Scotia Sea article 2014 ftieo https://doi.org/10.1016/j.margeo.2014.08.001 2022-07-26T23:47:19Z Sedimentary processes in small, isolated oceanic basins that form adjacent to continental margins but detached from continents remain poorly understood. This work describes two such basins located in the southern Scotia Sea, the Protector and Pirie basins. We analysed multichannel seismic profiles to interpret morphostructural features and stratigraphy of these basins. Sedimentary stacking patterns and depocentre distribution illustrate basin development patterns. Basal units infill basement depressions formed by the submerged banks of thinned continental crust that abut the basin plains. These lower and middle deposits of the sedimentary record are interpreted as pre- and syn-rift deposits. The laterally extensive upper deposits are interpreted as post-rift deposits. These include five discrete units evident in seismic profiles. A prominent regional reflection referred to as Reflector-c, separates in these upper deposits two sets of seismic units that have recorded major shifts in the dominant sedimentary processes, stacking patterns and paleo-environmental conditions. The most important processes controlling deposition of the older units (those beneath Reflector-c), include down-slope gravity processes that infill depressions created by crustal thinning and seafloor spreading. These occurred under the coeval influence of Circumpolar Deep Water circulation. The major processes influencing younger units (those above Reflector-c) include bottom water circulation of the Circumpolar Deep Water and Weddell Sea Deep Water water masses,which coursed along bathymetric contours of the seafloor. The Reflector-c discontinuity developed concurrently with middle Miocene tectonic changes, which led to the opening and deepening of deep gateways in the South Scotia Ridge. These facilitated overflow of Weddell Sea Deep Water from the Weddell Gyre into the Scotia Sea. This overflow in turn forced the Circumpolar Deep Water northwards. Analysis of the Protector and Pirie basins shows that their tectonic evolution influenced ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Ocean Antarctica Scotia Sea Weddell Sea Instituto Español de Oceanografía: e-IEO Antarctic Antarctic Ocean Pirie ENVELOPE(-44.633,-44.633,-60.700,-60.700) Protector ENVELOPE(-66.217,-66.217,-66.717,-66.717) Scotia Sea South Scotia Ridge ENVELOPE(-46.500,-46.500,-60.000,-60.000) Weddell Weddell Sea Marine Geology 357 163 181 |
institution |
Open Polar |
collection |
Instituto Español de Oceanografía: e-IEO |
op_collection_id |
ftieo |
language |
English |
topic |
Isolated deeo oceanic basins Tectonics Seismic stratigraphy Deep-water circulation Scotia Sea |
spellingShingle |
Isolated deeo oceanic basins Tectonics Seismic stratigraphy Deep-water circulation Scotia Sea Pérez, L.F. Maldonado, A. (Antonio) Bohoyo, F. Hernández-Molina, F.J. (Francisco Javier) Vázquez, J.T. (Juan Tomás) Lobo, F.J. (Francisco J.) Martos, Y.M. Depositional processes and growth patterns of isolated oceanic basins: the Protector and the Pirie basins ofthe Southern Scotia Sea (Antarctica) |
topic_facet |
Isolated deeo oceanic basins Tectonics Seismic stratigraphy Deep-water circulation Scotia Sea |
description |
Sedimentary processes in small, isolated oceanic basins that form adjacent to continental margins but detached from continents remain poorly understood. This work describes two such basins located in the southern Scotia Sea, the Protector and Pirie basins. We analysed multichannel seismic profiles to interpret morphostructural features and stratigraphy of these basins. Sedimentary stacking patterns and depocentre distribution illustrate basin development patterns. Basal units infill basement depressions formed by the submerged banks of thinned continental crust that abut the basin plains. These lower and middle deposits of the sedimentary record are interpreted as pre- and syn-rift deposits. The laterally extensive upper deposits are interpreted as post-rift deposits. These include five discrete units evident in seismic profiles. A prominent regional reflection referred to as Reflector-c, separates in these upper deposits two sets of seismic units that have recorded major shifts in the dominant sedimentary processes, stacking patterns and paleo-environmental conditions. The most important processes controlling deposition of the older units (those beneath Reflector-c), include down-slope gravity processes that infill depressions created by crustal thinning and seafloor spreading. These occurred under the coeval influence of Circumpolar Deep Water circulation. The major processes influencing younger units (those above Reflector-c) include bottom water circulation of the Circumpolar Deep Water and Weddell Sea Deep Water water masses,which coursed along bathymetric contours of the seafloor. The Reflector-c discontinuity developed concurrently with middle Miocene tectonic changes, which led to the opening and deepening of deep gateways in the South Scotia Ridge. These facilitated overflow of Weddell Sea Deep Water from the Weddell Gyre into the Scotia Sea. This overflow in turn forced the Circumpolar Deep Water northwards. Analysis of the Protector and Pirie basins shows that their tectonic evolution influenced ... |
format |
Article in Journal/Newspaper |
author |
Pérez, L.F. Maldonado, A. (Antonio) Bohoyo, F. Hernández-Molina, F.J. (Francisco Javier) Vázquez, J.T. (Juan Tomás) Lobo, F.J. (Francisco J.) Martos, Y.M. |
author_facet |
Pérez, L.F. Maldonado, A. (Antonio) Bohoyo, F. Hernández-Molina, F.J. (Francisco Javier) Vázquez, J.T. (Juan Tomás) Lobo, F.J. (Francisco J.) Martos, Y.M. |
author_sort |
Pérez, L.F. |
title |
Depositional processes and growth patterns of isolated oceanic basins: the Protector and the Pirie basins ofthe Southern Scotia Sea (Antarctica) |
title_short |
Depositional processes and growth patterns of isolated oceanic basins: the Protector and the Pirie basins ofthe Southern Scotia Sea (Antarctica) |
title_full |
Depositional processes and growth patterns of isolated oceanic basins: the Protector and the Pirie basins ofthe Southern Scotia Sea (Antarctica) |
title_fullStr |
Depositional processes and growth patterns of isolated oceanic basins: the Protector and the Pirie basins ofthe Southern Scotia Sea (Antarctica) |
title_full_unstemmed |
Depositional processes and growth patterns of isolated oceanic basins: the Protector and the Pirie basins ofthe Southern Scotia Sea (Antarctica) |
title_sort |
depositional processes and growth patterns of isolated oceanic basins: the protector and the pirie basins ofthe southern scotia sea (antarctica) |
publisher |
Centro Oceanográfico de Málaga |
publishDate |
2014 |
url |
http://hdl.handle.net/10508/9652 https://doi.org/10.1016/j.margeo.2014.08.001 |
op_coverage |
Antarctic Ocean Antarctic Atlantic Scotia Sea |
long_lat |
ENVELOPE(-44.633,-44.633,-60.700,-60.700) ENVELOPE(-66.217,-66.217,-66.717,-66.717) ENVELOPE(-46.500,-46.500,-60.000,-60.000) |
geographic |
Antarctic Antarctic Ocean Pirie Protector Scotia Sea South Scotia Ridge Weddell Weddell Sea |
geographic_facet |
Antarctic Antarctic Ocean Pirie Protector Scotia Sea South Scotia Ridge Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Ocean Antarctica Scotia Sea Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Ocean Antarctica Scotia Sea Weddell Sea |
op_relation |
0025-3227 http://hdl.handle.net/10508/9652 Marine Geology, 357. 2014: 163-181 doi:10.1016/j.margeo.2014.08.001 |
op_rights |
Attribution-NonCommercial-NoDerivs 3.0 Spain http://creativecommons.org/licenses/by-nc-nd/3.0/es/ openAccess |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.margeo.2014.08.001 |
container_title |
Marine Geology |
container_volume |
357 |
container_start_page |
163 |
op_container_end_page |
181 |
_version_ |
1766150315556470784 |