Mid-late pleistocene benthic foraminifera from Southwestern South Atlantic: Driven by primary productivity or water mass properties?

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...

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Autores principales: Chapori, N.G., Laprida, C., Watanabe, S., Totah, V., Violante, R.A.
Formato: JOUR
Materias:
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
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00262803_v60_n2_p195_Chapori
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00262803_v60_n2_p195_Chapori2023-10-03T14:37:03Z Mid-late pleistocene benthic foraminifera from Southwestern South Atlantic: Driven by primary productivity or water mass properties? Chapori, N.G. Laprida, C. Watanabe, S. Totah, V. Violante, R.A. 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 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00262803_v60_n2_p195_Chapori
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic 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
spellingShingle 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
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?
topic_facet 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
description 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.
format JOUR
author Chapori, N.G.
Laprida, C.
Watanabe, S.
Totah, V.
Violante, R.A.
author_facet Chapori, N.G.
Laprida, C.
Watanabe, S.
Totah, V.
Violante, R.A.
author_sort Chapori, N.G.
title Mid-late pleistocene benthic foraminifera from Southwestern South Atlantic: Driven by primary productivity or water mass properties?
title_short Mid-late pleistocene benthic foraminifera from Southwestern South Atlantic: Driven by primary productivity or water mass properties?
title_full Mid-late pleistocene benthic foraminifera from Southwestern South Atlantic: Driven by primary productivity or water mass properties?
title_fullStr Mid-late pleistocene benthic foraminifera from Southwestern South Atlantic: Driven by primary productivity or water mass properties?
title_full_unstemmed Mid-late pleistocene benthic foraminifera from Southwestern South Atlantic: Driven by primary productivity or water mass properties?
title_sort mid-late pleistocene benthic foraminifera from southwestern south atlantic: driven by primary productivity or water mass properties?
url http://hdl.handle.net/20.500.12110/paper_00262803_v60_n2_p195_Chapori
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AT watanabes midlatepleistocenebenthicforaminiferafromsouthwesternsouthatlanticdrivenbyprimaryproductivityorwatermassproperties
AT totahv midlatepleistocenebenthicforaminiferafromsouthwesternsouthatlanticdrivenbyprimaryproductivityorwatermassproperties
AT violantera midlatepleistocenebenthicforaminiferafromsouthwesternsouthatlanticdrivenbyprimaryproductivityorwatermassproperties
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