Control of oceanic circulation on sediment distribution in the southwestern Atlantic margin (23 to 55° S)
<p>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...
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doaj-6c9478f59bf84aba9ebd5153908356752021-09-15T06:08:11ZengCopernicus PublicationsOcean Science1812-07841812-07922021-09-01171213122910.5194/os-17-1213-2021Control of oceanic circulation on sediment distribution in the southwestern Atlantic margin (23 to 55° S)M. Michaelovitch de Mahiques0M. Michaelovitch de Mahiques1R. Violante2P. Franco-Fraguas3L. Burone4C. Barbedo Rocha5L. Ortega6R. Felicio dos Santos7B. S. Mi Kim8R. C. Lopes Figueira9M. Caruso Bícego10Oceanographic Institute of the University of São Paulo, 05508-120, São Paulo, BrazilInstitute of Energy and Environment of the University of São Paulo, 05508-010, São Paulo, BrazilServicio de Hidrografia Naval, C1270ABV, Buenos Aires, ArgentinaFacultad de Ciencias, Universidad de La Republica, 11400 Montevideo, UruguayFacultad de Ciencias, Universidad de La Republica, 11400 Montevideo, UruguayDepartment of Marine Sciences, University of Connecticut, Groton, CT 06340, USADepartamento de Biología Pesquera, Dirección Nacional de Recursos Acuáticos, 11200 Montevideo, UruguayOceanographic Institute of the University of São Paulo, 05508-120, São Paulo, BrazilOceanographic Institute of the University of São Paulo, 05508-120, São Paulo, BrazilOceanographic Institute of the University of São Paulo, 05508-120, São Paulo, BrazilOceanographic Institute of the University of São Paulo, 05508-120, São Paulo, Brazil<p>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 <span class="inline-formula">m</span>), the transfer of sediments from the Argentinean margin to the north of 35<span class="inline-formula"><sup>∘</sup></span> S is limited by the Subtropical Shelf Front and the basin-wide recirculated Antarctic Intermediate Water.</p> <p>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.</p>https://os.copernicus.org/articles/17/1213/2021/os-17-1213-2021.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
M. Michaelovitch de Mahiques 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 |
spellingShingle |
M. Michaelovitch de Mahiques 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) Ocean Science |
author_facet |
M. Michaelovitch de Mahiques 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 |
series |
Ocean Science |
issn |
1812-0784 1812-0792 |
publishDate |
2021-09-01 |
description |
<p>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 <span class="inline-formula">m</span>), the transfer of sediments from the Argentinean margin to the north of 35<span class="inline-formula"><sup>∘</sup></span> S is
limited by the Subtropical Shelf Front and the basin-wide recirculated Antarctic Intermediate Water.</p>
<p>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.</p> |
url |
https://os.copernicus.org/articles/17/1213/2021/os-17-1213-2021.pdf |
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