Control of oceanic circulation on sediment distribution in the southwestern Atlantic margin (23 to 55° S)
In this study, we interpret the role played by ocean circulation in sediment distribution on the southwestern Atlantic margin using radiogenic Nd and Pb isotopes. The latitudinal trends for Pb and Nd isotopes reflect the different current systems acting on the margin. The utilization of the sediment...
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ftdoajarticles:oai:doaj.org/article:6c9478f59bf84aba9ebd515390835675 2023-05-15T13:35:40+02:00 Control of oceanic circulation on sediment distribution in the southwestern Atlantic margin (23 to 55° S) M. Michaelovitch de Mahiques R. Violante P. Franco-Fraguas L. Burone C. Barbedo Rocha L. Ortega R. Felicio dos Santos B. S. Mi Kim R. C. Lopes Figueira M. Caruso Bícego 2021-09-01T00:00:00Z https://doi.org/10.5194/os-17-1213-2021 https://doaj.org/article/6c9478f59bf84aba9ebd515390835675 EN eng Copernicus Publications https://os.copernicus.org/articles/17/1213/2021/os-17-1213-2021.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 doi:10.5194/os-17-1213-2021 1812-0784 1812-0792 https://doaj.org/article/6c9478f59bf84aba9ebd515390835675 Ocean Science, Vol 17, Pp 1213-1229 (2021) Geography. Anthropology. Recreation G Environmental sciences GE1-350 article 2021 ftdoajarticles https://doi.org/10.5194/os-17-1213-2021 2022-12-31T07:01:44Z In this study, we interpret the role played by ocean circulation in sediment distribution on the southwestern Atlantic margin using radiogenic Nd and Pb isotopes. The latitudinal trends for Pb and Nd isotopes reflect the different current systems acting on the margin. The utilization of the sediment fingerprinting method allowed us to associate the isotopic signatures with the main oceanographic features in the area. We recognized differences between Nd and Pb sources to the Argentinean shelf (carried by the flow of Subantarctic Shelf Water) and slopes (transported by deeper flows). Sediments from Antarctica extend up to the Uruguayan margin, carried by the Upper and Lower Circumpolar Deep Water. Our data confirm that, for shelf and intermediate areas (the upper 1200 m ), the transfer of sediments from the Argentinean margin to the north of 35 ∘ S is limited by the Subtropical Shelf Front and the basin-wide recirculated Antarctic Intermediate Water. On the southern Brazilian inner and middle shelf, it is possible to recognize the northward influence of the Río de la Plata sediments carried by the Plata Plume Water. Another flow responsible for sediment transport and deposition on the outer shelf and slope is the southward flow of the Brazil Current. Finally, we propose that the Brazil–Malvinas Confluence and the Santos Bifurcation act as boundaries of geochemical provinces in the area. A conceptual model of sediment sources and transport is provided for the southwestern Atlantic margin. Article in Journal/Newspaper Antarc* Antarctic Antarctica Directory of Open Access Journals: DOAJ Articles Antarctic Ocean Science 17 5 1213 1229 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
spellingShingle |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 M. Michaelovitch de Mahiques R. Violante P. Franco-Fraguas L. Burone C. Barbedo Rocha L. Ortega R. Felicio dos Santos B. S. Mi Kim R. C. Lopes Figueira M. Caruso Bícego Control of oceanic circulation on sediment distribution in the southwestern Atlantic margin (23 to 55° S) |
topic_facet |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
description |
In this study, we interpret the role played by ocean circulation in sediment distribution on the southwestern Atlantic margin using radiogenic Nd and Pb isotopes. The latitudinal trends for Pb and Nd isotopes reflect the different current systems acting on the margin. The utilization of the sediment fingerprinting method allowed us to associate the isotopic signatures with the main oceanographic features in the area. We recognized differences between Nd and Pb sources to the Argentinean shelf (carried by the flow of Subantarctic Shelf Water) and slopes (transported by deeper flows). Sediments from Antarctica extend up to the Uruguayan margin, carried by the Upper and Lower Circumpolar Deep Water. Our data confirm that, for shelf and intermediate areas (the upper 1200 m ), the transfer of sediments from the Argentinean margin to the north of 35 ∘ S is limited by the Subtropical Shelf Front and the basin-wide recirculated Antarctic Intermediate Water. On the southern Brazilian inner and middle shelf, it is possible to recognize the northward influence of the Río de la Plata sediments carried by the Plata Plume Water. Another flow responsible for sediment transport and deposition on the outer shelf and slope is the southward flow of the Brazil Current. Finally, we propose that the Brazil–Malvinas Confluence and the Santos Bifurcation act as boundaries of geochemical provinces in the area. A conceptual model of sediment sources and transport is provided for the southwestern Atlantic margin. |
format |
Article in Journal/Newspaper |
author |
M. Michaelovitch de Mahiques R. Violante P. Franco-Fraguas L. Burone C. Barbedo Rocha L. Ortega R. Felicio dos Santos B. S. Mi Kim R. C. Lopes Figueira M. Caruso Bícego |
author_facet |
M. Michaelovitch de Mahiques R. Violante P. Franco-Fraguas L. Burone C. Barbedo Rocha L. Ortega R. Felicio dos Santos B. S. Mi Kim R. C. Lopes Figueira M. Caruso Bícego |
author_sort |
M. Michaelovitch de Mahiques |
title |
Control of oceanic circulation on sediment distribution in the southwestern Atlantic margin (23 to 55° S) |
title_short |
Control of oceanic circulation on sediment distribution in the southwestern Atlantic margin (23 to 55° S) |
title_full |
Control of oceanic circulation on sediment distribution in the southwestern Atlantic margin (23 to 55° S) |
title_fullStr |
Control of oceanic circulation on sediment distribution in the southwestern Atlantic margin (23 to 55° S) |
title_full_unstemmed |
Control of oceanic circulation on sediment distribution in the southwestern Atlantic margin (23 to 55° S) |
title_sort |
control of oceanic circulation on sediment distribution in the southwestern atlantic margin (23 to 55° s) |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/os-17-1213-2021 https://doaj.org/article/6c9478f59bf84aba9ebd515390835675 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Ocean Science, Vol 17, Pp 1213-1229 (2021) |
op_relation |
https://os.copernicus.org/articles/17/1213/2021/os-17-1213-2021.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 doi:10.5194/os-17-1213-2021 1812-0784 1812-0792 https://doaj.org/article/6c9478f59bf84aba9ebd515390835675 |
op_doi |
https://doi.org/10.5194/os-17-1213-2021 |
container_title |
Ocean Science |
container_volume |
17 |
container_issue |
5 |
container_start_page |
1213 |
op_container_end_page |
1229 |
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1766068622657060864 |