A high-resolution benthic stable-isotope record for the South Atlantic; implications for orbital scale changes in late Paleocene-early Eocene climate and circulation

Online Access: Get full text
Author(s): Littler, Kate; Zachos, James C.; Kersey, A.; Roehl, U.; Westerhold, Thomas
Author Affiliation(s): Primary:
University of California at Santa Cruz, Department of Earth and Planetary Sciences, Santa Cruz, CA, United States
University of Bremen, Germany
Volume Title: AGU 2011 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2011; American Geophysical Union 2011 fall meeting, San Francisco, CA, Dec. 5-9, 2011. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: Changes in Paleogene carbon-cycling and climate have been the focus of much recent attention, in particular the mechanisms underlying the hyperthermal events such as the PETM and ETM-2. Hitherto less well-constrained are the background low-amplitude eccentricity/precession paced cycles seen in carbon and oxygen isotope records, both preceding and following these excursions. The high-resolution, bulk-carbonate stable-isotope record from the Late Paleocene-Early Eocene of Site 1262 (Walvis Ridge, South Atlantic), clearly demonstrated orbital control on these cycles and allowed the relative timing of the hyperthermals to be better constrained (Zachos et al., 2010). Here we present a complimentary high-resolution (∼2-3 kyr), benthic foraminiferal stable-isotope record for Site 1262, the first orbital-scale benthic record for the Late Paleocene-Early Eocene. This stratigraphically-continuous, astronomically-tuned record, based primarily on analyses of benthic taxa Nuttalides truempyi, allows for the detailed assignment of relative age, and phasing of changes in bottom water carbon chemistry. Additionally, complimentary % coarse fraction (%CF), %CaCO3 and Fe Intensity records from Site 1262, track both long and short-term changes in saturation and CCD depth, and thus provide insight into variations in ocean circulation patterns. Finally, the new benthic oxygen-isotope record constrains the absolute changes in deep sea temperature changes associated with the carbon cycle oscillations during this climatically dynamic period.
Year of Publication: 2011
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; C-13/C-12; Carbon; Carbon cycle; Carbonate compensation depth; Carbonates; Cenozoic; Eocene; Geochemical cycle; Isotope ratios; Isotopes; Leg 208; Lower Eocene; ODP Site 1262; Ocean Drilling Program; Paleo-oceanography; Paleocene; Paleocene-Eocene Thermal Maximum; Paleocirculation; Paleoenvironment; Paleogene; South Atlantic; Stable isotopes; Tertiary; Upper Paleocene; Walvis Ridge
Coordinates: S271100 S271100 E0013500 E0013400
Record ID: 2018028762
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States