Deep-Sea Ostracods from the South Atlantic Sector of the Southern Ocean During the Last 370,000 Years

Yasuhara, Moriaki and Cronin, Thomas M. and Hunt, Gene and Hodell, David A. (2011) Deep-Sea Ostracods from the South Atlantic Sector of the Southern Ocean During the Last 370,000 Years. Journal of Paleontology, 83 (6). 914 -930. DOI

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We report changes of deep-sea ostracod fauna during the last 370,000 yr from the Ocean Drilling Program (ODP) Hole 704A in the South Atlantic sector of the Southern Ocean. The results show that faunal changes are coincident with glacial/interglacial-scale deep-water circulation changes, even though our dataset is relatively small and the waters are barren of ostracods until mid-MIS (Marine Isotope Stage) 5. Krithe and Poseidonamicus were dominant during the Holocene interglacial period and the latter part of MIS 5, when this site was under the influence of North Atlantic Deep Water (NADW). Conversely, Henryhowella and Legitimocythere were dominant during glacial periods, when this site was in the path of Circumpolar Deep Water (CPDW). Three new species (Aversovalva brandaoae, Poseidonamicus hisayoae, and Krithe mazziniae) are described herein. This is the first report of Quaternary glacial/interglacial scale deep-sea ostracod faunal changes in the Southern and South Atlantic Oceans, a key region for understanding Quaternary climate and deep-water circulation, although the paucity of Quaternary ostracods in this region necessitates further research.

Item Type: Article
Uncontrolled Keywords: 2011AREP; IA63;
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title: Journal of Paleontology
Volume: 83
Page Range: 914 -930
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 06 Feb 2012 17:25
Last Modified: 23 Jul 2013 10:03

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