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Jansen, Eystein; Sejrup, Hans Petter (1987): Oxygen and carbon isotopic composition of benthic and planktonic foraminifers at DSDP Site 610 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.788583, Supplement to: Jansen, E; Sejrup, HP (1987): Stable isotope stratigraphy and amino-acid empimerization for the last 2.4 m.y. at Site 610, Holes 610 and 610A. In: Ruddiman, WF; Kidd, RB; Thomas, E; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 94, 879-888, https://doi.org/10.2973/dsdp.proc.94.123.1987

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Abstract:
A record of carbon and oxygen isotopes in benthic and planktonic foraminifers has been obtained from the interval corresponding to the last 2.4 m.y. of Site 610, Holes 610 and 610A, with a sample resolution of about 30 kyr. The record from the late Quaternary (<0.9 Ma) shows large amplitudes and high frequencies in oxygen isotopic variation. Prior to 0.9 Ma the isotopic variability record is reduced in amplitude (but not in frequency) compared with the late Quaternary, suggesting lower ice-volume and climatic fluctuations, and higher average eustatic sea level.
Left-coiling (L, polar) Neogloboquadrinapachyderma were not found in samples between 1.0 and 2.2 Ma, indicating less influence of polar front migrations in the Northeast Atlantic. Both polar planktonic faunas and larger isotope fluctuations reappear in the lowermost samples (2.3 to 2.4 Ma), pointing toward a period of larger climatic variability in the late Pliocene than in the early Quaternary.
The variation in benthic d13C and hence in deep-water d13C seems to have been constant through the analyzed section, reflecting a stable variability in the production of North Atlantic Deep Water (NADW) and possibly in Norwegian-Greenland Sea Overflow. Preliminary analyses of amino-acid epimerization in N. pachyderma (L) indicate a constant rate of epimerization to approximately 0.3 Ma. Beneath this level the average epimerization rate is much reduced.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Latitude: 53.221500 * Longitude: -18.886800
Date/Time Start: 1983-07-28T00:00:00 * Date/Time End: 1983-07-28T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
5 datasets

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Datasets listed in this publication series

  1. Jansen, E; Sejrup, HP (1987): (Table 7) D-alloisoleucine and L-isoleucine ratios in Neogloboquadrina pachyderma (L) from DSDP Site 94-610. https://doi.org/10.1594/PANGAEA.788582
  2. Jansen, E; Sejrup, HP (1987): (Table 4) Oxygen and carbon isotopic composition of benthic foraminifers at DSDP Hole 94-610. https://doi.org/10.1594/PANGAEA.788580
  3. Jansen, E; Sejrup, HP (1987): (Table 5) Oxygen and carbon isotopic composition of planktonic foraminifers at DSDP Hole 94-610. https://doi.org/10.1594/PANGAEA.788581
  4. Jansen, E; Sejrup, HP (1987): (Table 2) Oxygen and carbon isotopic composition of benthic foraminifers at DSDP Hole 94-610A. https://doi.org/10.1594/PANGAEA.788577
  5. Jansen, E; Sejrup, HP (1987): (Table 3) Oxygen and carbon isotopic composition of planktonic foraminifers at DSDP Hole 94-610A. https://doi.org/10.1594/PANGAEA.788579