A contourite depositional system along the Uruguayan continental margin: sedimentary, oceanographic and paleoceanographic implications
For the first time, a multidisciplinary approach to evaluate the influence of bottom currents in the Uruguayan continental margin is presented. Bathymetric data and multichannel 2D and 3D seismic reflection profiles were used to construct a morphosedimentary map to interpret and decode sedimentary a...
Published in: | Marine Geology |
---|---|
Main Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier Science
|
Subjects: | |
Online Access: | http://hdl.handle.net/11336/43741 |
id |
ftconicet:oai:ri.conicet.gov.ar:11336/43741 |
---|---|
record_format |
openpolar |
spelling |
ftconicet:oai:ri.conicet.gov.ar:11336/43741 2023-10-09T21:45:20+02:00 A contourite depositional system along the Uruguayan continental margin: sedimentary, oceanographic and paleoceanographic implications Hernandez Molina, F.Javier Soto, Matias Piola, Alberto Ricardo Tomasini, Juan Preu, Benedict Thompson, Phil Baldini, Gianluca Creaser, Adam Violante, Roberto Antonio Morales, Ethel Paterlini, Marcelo De Santa Ana, Hector application/pdf http://hdl.handle.net/11336/43741 eng eng Elsevier Science info:eu-repo/semantics/altIdentifier/doi/10.1016/j.margeo.2015.10.008 info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0025322715300487 http://hdl.handle.net/11336/43741 Hernandez Molina, F.Javier; Soto, Matias; Piola, Alberto Ricardo; Tomasini, Juan; Preu, Benedict; et al.; A contourite depositional system along the Uruguayan continental margin: sedimentary, oceanographic and paleoceanographic implications; Elsevier Science; Marine Geology; 378; 8-2016; 333-349 0025-3227 CONICET Digital CONICET info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ SEDIMENTARY PROCESSES SEISMIC STRATIGRAPHY HIGH AMPLITUDE REFLECTIONS PALEOCEANOGRAPHY CONTOURITES URUGUAYAN MARGIN https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1016/j.margeo.2015.10.008 2023-09-24T18:39:05Z For the first time, a multidisciplinary approach to evaluate the influence of bottom currents in the Uruguayan continental margin is presented. Bathymetric data and multichannel 2D and 3D seismic reflection profiles were used to construct a morphosedimentary map to interpret and decode sedimentary and oceanographic processes along the Uruguayan continental margin. Based on these results, an extensive contourite depositional system on the margin is described, which contains an impressive array of large erosive, depositional (drifts) and mixed (terrace) features, which have been generated primarily by the near-bottom flows associated with water masses of Antarctic and subantarctic origin. From the Eocene–Oligocene boundary up to present time, the long-term influence of water masses from higher southern latitudes, in combination with down-slope sedimentary processes have strongly controlled the overall margin morphology. Most of the features described here, were formed during the middle/late Miocene epoch due to paleoceanographic shifts that include the arrival of Antarctic Intermediate Water along the margin, which in combination with deeper Antarctic Bottom Water are fundamental in the margin evolution. In combination with Quaternary climatic and eustatic changes in sea level, fluctuations of the Brazil–Malvinas Confluence influenced subsequently glacial and interglacial stages as recognized in sedimentary features defined here. These paleoceanographic changes controlled the sedimentary stacking pattern and the locations of high amplitude reflections along the contourite terraces, which could be associated with sandy deposits. A more detailed understanding of the margin will improve interpretations of variations in the South Atlantic subtropical gyre and further constrain general climatic and ocean circulation models. Fil: Hernandez Molina, F.Javier. University of London; Reino Unido Fil: Soto, Matias. ANCAP; Uruguay Fil: Piola, Alberto Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; ... Article in Journal/Newspaper Antarc* Antarctic CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Antarctic Uruguay Ricardo ENVELOPE(-63.033,-63.033,-64.867,-64.867) Molina ENVELOPE(-62.017,-62.017,-64.017,-64.017) Hernandez ENVELOPE(-62.167,-62.167,-74.500,-74.500) Marine Geology 378 333 349 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
SEDIMENTARY PROCESSES SEISMIC STRATIGRAPHY HIGH AMPLITUDE REFLECTIONS PALEOCEANOGRAPHY CONTOURITES URUGUAYAN MARGIN https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
SEDIMENTARY PROCESSES SEISMIC STRATIGRAPHY HIGH AMPLITUDE REFLECTIONS PALEOCEANOGRAPHY CONTOURITES URUGUAYAN MARGIN https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Hernandez Molina, F.Javier Soto, Matias Piola, Alberto Ricardo Tomasini, Juan Preu, Benedict Thompson, Phil Baldini, Gianluca Creaser, Adam Violante, Roberto Antonio Morales, Ethel Paterlini, Marcelo De Santa Ana, Hector A contourite depositional system along the Uruguayan continental margin: sedimentary, oceanographic and paleoceanographic implications |
topic_facet |
SEDIMENTARY PROCESSES SEISMIC STRATIGRAPHY HIGH AMPLITUDE REFLECTIONS PALEOCEANOGRAPHY CONTOURITES URUGUAYAN MARGIN https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
For the first time, a multidisciplinary approach to evaluate the influence of bottom currents in the Uruguayan continental margin is presented. Bathymetric data and multichannel 2D and 3D seismic reflection profiles were used to construct a morphosedimentary map to interpret and decode sedimentary and oceanographic processes along the Uruguayan continental margin. Based on these results, an extensive contourite depositional system on the margin is described, which contains an impressive array of large erosive, depositional (drifts) and mixed (terrace) features, which have been generated primarily by the near-bottom flows associated with water masses of Antarctic and subantarctic origin. From the Eocene–Oligocene boundary up to present time, the long-term influence of water masses from higher southern latitudes, in combination with down-slope sedimentary processes have strongly controlled the overall margin morphology. Most of the features described here, were formed during the middle/late Miocene epoch due to paleoceanographic shifts that include the arrival of Antarctic Intermediate Water along the margin, which in combination with deeper Antarctic Bottom Water are fundamental in the margin evolution. In combination with Quaternary climatic and eustatic changes in sea level, fluctuations of the Brazil–Malvinas Confluence influenced subsequently glacial and interglacial stages as recognized in sedimentary features defined here. These paleoceanographic changes controlled the sedimentary stacking pattern and the locations of high amplitude reflections along the contourite terraces, which could be associated with sandy deposits. A more detailed understanding of the margin will improve interpretations of variations in the South Atlantic subtropical gyre and further constrain general climatic and ocean circulation models. Fil: Hernandez Molina, F.Javier. University of London; Reino Unido Fil: Soto, Matias. ANCAP; Uruguay Fil: Piola, Alberto Ricardo. Consejo Nacional de Investigaciones Científicas y Técnicas; ... |
format |
Article in Journal/Newspaper |
author |
Hernandez Molina, F.Javier Soto, Matias Piola, Alberto Ricardo Tomasini, Juan Preu, Benedict Thompson, Phil Baldini, Gianluca Creaser, Adam Violante, Roberto Antonio Morales, Ethel Paterlini, Marcelo De Santa Ana, Hector |
author_facet |
Hernandez Molina, F.Javier Soto, Matias Piola, Alberto Ricardo Tomasini, Juan Preu, Benedict Thompson, Phil Baldini, Gianluca Creaser, Adam Violante, Roberto Antonio Morales, Ethel Paterlini, Marcelo De Santa Ana, Hector |
author_sort |
Hernandez Molina, F.Javier |
title |
A contourite depositional system along the Uruguayan continental margin: sedimentary, oceanographic and paleoceanographic implications |
title_short |
A contourite depositional system along the Uruguayan continental margin: sedimentary, oceanographic and paleoceanographic implications |
title_full |
A contourite depositional system along the Uruguayan continental margin: sedimentary, oceanographic and paleoceanographic implications |
title_fullStr |
A contourite depositional system along the Uruguayan continental margin: sedimentary, oceanographic and paleoceanographic implications |
title_full_unstemmed |
A contourite depositional system along the Uruguayan continental margin: sedimentary, oceanographic and paleoceanographic implications |
title_sort |
contourite depositional system along the uruguayan continental margin: sedimentary, oceanographic and paleoceanographic implications |
publisher |
Elsevier Science |
url |
http://hdl.handle.net/11336/43741 |
long_lat |
ENVELOPE(-63.033,-63.033,-64.867,-64.867) ENVELOPE(-62.017,-62.017,-64.017,-64.017) ENVELOPE(-62.167,-62.167,-74.500,-74.500) |
geographic |
Antarctic Uruguay Ricardo Molina Hernandez |
geographic_facet |
Antarctic Uruguay Ricardo Molina Hernandez |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.margeo.2015.10.008 info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0025322715300487 http://hdl.handle.net/11336/43741 Hernandez Molina, F.Javier; Soto, Matias; Piola, Alberto Ricardo; Tomasini, Juan; Preu, Benedict; et al.; A contourite depositional system along the Uruguayan continental margin: sedimentary, oceanographic and paleoceanographic implications; Elsevier Science; Marine Geology; 378; 8-2016; 333-349 0025-3227 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1016/j.margeo.2015.10.008 |
container_title |
Marine Geology |
container_volume |
378 |
container_start_page |
333 |
op_container_end_page |
349 |
_version_ |
1779317788688515072 |