The mid-Pliocene (4.3-2.6 Ma) benthic stable isotope record of the Southern Ocean; ODP Sites 1092 and 704, Meteor Rise

Author(s): Andersson, C.; Warnke, D. A.; Channell, J. E. T.; Stoner, J.; Jansen, E.
Author Affiliation(s): Primary:
University of Bergen, Bjerknes Centre for Climate Research, Bergen, Norway
Other:
University of Florida, United States
California State University, United States
University of California at Davis, United States
Nansen Environmental and Remote Sensing Center (NERSC), Norway
Volume Title: Southern Ocean paleoceanography; insights from Ocean Drilling Program Leg 177
Volume Author(s): Gersonde, Rainer, editor; Hodell, David A.
Source: Southern Ocean paleoceanography; insights from Ocean Drilling Program Leg 177, edited by Rainer Gersonde and David A. Hodell. Palaeogeography, Palaeoclimatology, Palaeoecology, 182(3-4), p.165-181. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0031-0182 CODEN: PPPYAB
Note: In English. 63 refs.; illus., incl. sketch map
Summary: We present mid-Pliocene (4.3-2.6 Ma) benthic stable oxygen and carbon isotope data from Ocean Drilling Program Site 1092 (ODP Leg 177) drilled in the sub-Antarctic sector of the Southern Ocean. The results are compared with the stable isotope results from nearby Site 704 (ODP Leg 114). Oxygen isotope data show that minimum values are about 0.5 per mil less than those of the Holocene, which is consistent with the results from Site 704, indicating only minor deglaciation of Antarctica during the studied interval. Oxygen isotope data from both Site 1092 and Site 704 are slightly higher relative to Pacific values during several intervals which could be related to the contribution of warm, saline North Atlantic Deep Water (NADW). Comparisons of benthic carbon isotope gradients between sites located in the North Atlantic, sub-Antarctic sector of the Southern Ocean, and Pacific indicate that at times, the gradient between the Southern Ocean and the Pacific evolved differently than the Atlantic-Pacific gradient. This suggests that variations in NADW strength alone might not be responsible for the observed carbon isotope values in the Southern Ocean.
Year of Publication: 2002
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Antarctic Ocean; Atlantic Ocean; Benthic taxa; C-13/C-12; Carbon; Cenozoic; Chemical composition; Climate change; Deglaciation; Foraminifera; Glacial geology; Glaciation; Invertebrata; Isotope ratios; Isotopes; Leg 114; Leg 138; Leg 154; Leg 177; Marine sediments; Meteor Rise; Microfossils; Middle Pliocene; Neogene; North Atlantic; O-18/O-16; ODP Site 1092; ODP Site 704; ODP Site 849; ODP Site 925; Ocean Drilling Program; Oxygen; Paleoclimatology; Paleomagnetism; Pliocene; Protista; Sediments; South Atlantic; Southern Ocean; Stable isotopes; Tertiary
Coordinates: S462442 S462442 E0070448 E0070448
S465246 S465245 E0072515 E0072515
Record ID: 2002052684
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands