NDLI: Middle Pleistocene sea surface temperature in the Brazil-Malvinas Confluence Zone: Paleoceanographic implications based on planktonic foraminifera

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Middle Pleistocene sea surface temperature in the Brazil-Malvinas Confluence Zone: Paleoceanographic implications based on planktonic foraminifera

Content Provider	Semantic Scholar
Author	Laprida, Cecilia Chapori, Natalia García Chiessi, C. M. Violante, Roberto A. Watanabe, Silvia Totah, Violeta
Copyright Year	2011
Abstract	We reconstructed Middle Pleistocene surface hydrography in the western South Atlantic based on planktonic foraminiferal assemblages, modern analog technique and Globorotalia truncatulinoides isotopic ratios of core SP1251 (3829,7 ́S / 5340,7 ́W / 3400 m water depth). Biostratigraphic analysis suggests that sediments were deposited between 0.3 and 0.12 Ma and therefore correlate to Marine Isotopic Stage 6 or 8. Faunal assemblage-based winter and summer SST estimates suggest that the western South Atlantic at 38S was 4-6C colder than at present, within the expected range for a glacial interval. High relative abundances of subantarctic species, particularly the dominance of Neogloboquadrina pachyderma (left), support lower than present SSTs throughout the recorded period. The oxygen isotopic composition of Globorotalia truncatulinoides suggests a northward shift of the Brazil-Malvinas Confluence Zone and of the associated mid-latitude frontal system during this Middle Pleistocene cold period, and a stronger than present influence of superficial subantarctic waters and lowering in SSts at the core site during the recorded Middle Pleisto-
Starting Page	183
Ending Page	194
Page Count	12
File Format	PDF HTM / HTML
Volume Number	57
Alternate Webpage(s)	http://each.uspnet.usp.br/p2l/wp-content/uploads/2015/07/Laprida_et_al_2011.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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