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Abstract:

In the Atlantic sector of the Southern Ocean up to 35°S, Neogene benthic foraminiferal faunal changes have been interpreted, alternatively, as changes in deep water-masses distribution and organic matter availability, in surface, the Southwestern South Atlantic presents a highly dynamic frontal zone and exhibits large spatial and temporal variability in primary productivity that influences the export of organic carbon from the euphotic zone. However, below ∼1000 meters depth, it is characterized by the interaction of several water masses. For this reason, the western sector of the South Atlantic is a natural laboratory to test the benthic foraminifera's response to changes in both, the deep water-masses distribution and the exported productivity, in order to define which was the main factor controlling the benthic foraminiferal assemblages structure during a glacial Mid-Late Pleistocene event, abundance analysis of organic matter content, oxygen availability and water masses marker species, and Q-mode factor analysis were carried out on core SP1251 (3400m; ∼3S°S - 54°W). Our results indicate that the benthic foraminiferal assemblages are mainly composed of high organic matter and oxygen availability-associated species revealing that productivity has been the main factor in determining the stracture of the assemblages' composition. These results also reflect that surface productivity regime would have not been uniform as a result of variations in the shelfbreak up welling of Patagonia as a consequence of variations in the Antarctic upwelling.

Registro:

Documento: Artículo
Título:Mid-late pleistocene benthic foraminifera from Southwestern South Atlantic: Driven by primary productivity or water mass properties?
Autor:Chapori, N.G.; Laprida, C.; Watanabe, S.; Totah, V.; Violante, R.A.
Filiación:Instituto de Estudios Andinos Don Pablo Groeber, Departamento de Ciencias Geológicas, Ciudad Universitaria, Intendente Güiraldes 2160, Buenos Aires, C1428EGA, Argentina
Museo Argentino de Ciencias Naturales Bernardino Rivadavia, Av. Ángel Gallardo 47, Buenos Aires, C1405DJR, Argentina
División de Geología Marina, Departamento de Oceanografía, Servicio de Hidrografía Naval, Av. Montes de Oca 212, Buenos Aires, C1270ABV, Argentina
Palabras clave:Benthic foraminifera; Mid-Late pleistocene; Paleoceanography; Primary productivity; South atlantic ocean; abundance; benthic foraminifera; fauna; Neogene; organic carbon; paleoceanography; Pleistocene; primary production; upwelling; water mass; Atlantic Ocean; Atlantic Ocean (South); Patagonia; Foraminifera
Año:2014
Volumen:60
Número:2
Página de inicio:195
Página de fin:210
Título revista:Micropaleontology
Título revista abreviado:Micropaleontology
ISSN:00262803
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00262803_v60_n2_p195_Chapori

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Citas:

---------- APA ----------
Chapori, N.G., Laprida, C., Watanabe, S., Totah, V. & Violante, R.A. (2014) . Mid-late pleistocene benthic foraminifera from Southwestern South Atlantic: Driven by primary productivity or water mass properties?. Micropaleontology, 60(2), 195-210.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00262803_v60_n2_p195_Chapori [ ]
---------- CHICAGO ----------
Chapori, N.G., Laprida, C., Watanabe, S., Totah, V., Violante, R.A. "Mid-late pleistocene benthic foraminifera from Southwestern South Atlantic: Driven by primary productivity or water mass properties?" . Micropaleontology 60, no. 2 (2014) : 195-210.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00262803_v60_n2_p195_Chapori [ ]
---------- MLA ----------
Chapori, N.G., Laprida, C., Watanabe, S., Totah, V., Violante, R.A. "Mid-late pleistocene benthic foraminifera from Southwestern South Atlantic: Driven by primary productivity or water mass properties?" . Micropaleontology, vol. 60, no. 2, 2014, pp. 195-210.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00262803_v60_n2_p195_Chapori [ ]
---------- VANCOUVER ----------
Chapori, N.G., Laprida, C., Watanabe, S., Totah, V., Violante, R.A. Mid-late pleistocene benthic foraminifera from Southwestern South Atlantic: Driven by primary productivity or water mass properties?. Micropaleontology. 2014;60(2):195-210.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00262803_v60_n2_p195_Chapori [ ]