Título:
Control of oceanic circulation on sediment distribution in the southwestern Atlantic margin (23 to 55º S)
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Autor:
Michaelovitch de Mahiques, Michel
Violante, Roberto
Franco-Fraguas, Paula
Burone, Leticia
Barbedo Rocha, Cesar
Ortega, Leonardo
Felicio dos Santos, Rosangela
Sung Mi Kim, Bianca
Lopes Figueira, Rubens Cesar
Caruso Bícego, Marcia
Violante, Roberto
Franco-Fraguas, Paula
Burone, Leticia
Barbedo Rocha, Cesar
Ortega, Leonardo
Felicio dos Santos, Rosangela
Sung Mi Kim, Bianca
Lopes Figueira, Rubens Cesar
Caruso Bícego, Marcia
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Tipo de documento:
Artículo
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Palabras clave:
Sediment distribution
Ocean circulation
Sediment fingerprinting method
Isotopic signatures
Ocean circulation
Sediment fingerprinting method
Isotopic signatures
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Año de publicación:
2021
Contenido:
Resumen:
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.
Descripción:
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European Geosciences Union
EN:
Ocean Science, 2021, 15(5): 1213-1229.
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Citación:
Michaelovitch de Mahiques, M, Violante, R, Franco-Fraguas, P [y otros autores]. "Control of oceanic circulation on sediment distribution in the southwestern Atlantic margin (23 to 55º S)". Ocean Science. [en línea] 2021, 15(5): 1213-1229. 17 h. DOI: 10.5194/os-17-1213-2021.
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ISSN:
1812-0792
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Licencia:
Licencia Creative Commons Atribución (CC - By 4.0)
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| Ficheros | Descripción | Tamaño | Formato | ||
|---|---|---|---|---|---|
| 105194os1712132021.pdf | — | 5.26 MB | Adobe PDF |