Paleoceanographic change during the middle Miocene climate revolution; an Antarctic stable isotope perspective

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doi: 10.1029/151GM14
Author(s): Shevenell, A. E.; Kennett, J. P.
Author Affiliation(s): Primary:
University of California at Santa Barbara, Department of Geological Sciences, Santa Barbara, CA, United States
University of California at Santa Barbara, United States
Texas A&M University, United States
Volume Title: Cenozoic Southern Ocean; tectonics, sedimentation, and climate change between Australia and Antarctica
Volume Author(s): Exon, Neville F., editor; Kennett, James P.; Malone, Mitchell
Source: The Cenozoic Southern Ocean; tectonics, sedimentation, and climate change between Australia and Antarctica, edited by Neville F. Exon, James P. Kennett and Mitchell Malone. Geophysical Monograph, Vol.151, p.235-251. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0065-8448. ISBN: 978-1-118-66621-0 CODEN: GPMGAD
Note: In English. 52 refs.; illus., incl. 3 tables, sketch map
Summary: Ocean circulation and atmospheric pCO2 variations have been cited as potential mechanisms driving middle Miocene cooling and Antarctic cryosphere expansion. Well-dated high latitude benthic foraminifer stable isotope records from the South Tasman Rise (STR; ODP Sites 1170 and 1171) exhibit familiar patterns of long and short term middle Miocene climate change and inferred carbon cycle dynamics. Integrated STR and southwest Pacific stable isotope time series and time slice data indicate regional ocean circulation changes commensurate with the middle Miocene global climate transition. STR stable isotopes and southwest Pacific meridional 13C gradients suggest that Warm Saline Deep Water from the Tethys Sea dominated regional bottom waters between 16.8 and 16.2 Ma, during the peak of the Miocene Climatic Optimum (MCO), and exerted intermittent influence on the STR until the end of the MCO. Southern Ocean derived Southern Component Water influenced the STR beginning at 16.2 Ma and dominated the southwest Pacific from 14.9 to 14.2 Ma and 13.8 to 12 Ma. (modif. j. abstr.)
Year of Publication: 2004
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Anomalinidae; Antarctic ice sheet; Antarctica; Atmosphere; Biostratigraphy; C-13/C-12; Carbon; Carbon cycle; Carbon dioxide; Cassidulinacea; Cenozoic; Cibicidoides; Climate change; Cooling; East Antarctic ice sheet; Foraminifera; Geochemical cycle; Greenhouse effect; Indian Ocean; Invertebrata; Isotope ratios; Isotopes; Leg 189; Magnetostratigraphy; Microfossils; Middle Miocene; Miocene; Nannofossils; Neogene; O-18/O-16; ODP Site 1170; ODP Site 1171; Ocean Drilling Program; Ocean circulation; Oxygen; Pacific Ocean; Paleo-oceanography; Paleoclimatology; Planktonic taxa; Plantae; Protista; Rotaliina; South Pacific; South Tasman Rise; Southern Ocean; Southwest Pacific; Stable isotopes; Tertiary; Tethys; West Pacific
Coordinates: S471000 S470900 E1460300 E1460200
S483000 S482900 E1490700 E1490600
Record ID: 2005035033
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