Oxygen and carbon isotopic composition of benthic and planktonic foraminifers at DSDP Site 610 ...

• Main Authors: Jansen, Eystein, Sejrup, Hans Petter
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1987
• Subjects: Deep Sea Drilling Project DSDP; Northeast Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.788583; https://doi.pangaea.de/10.1594/PANGAEA.788583

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 ... : Supplement to: Jansen, Eystein; Sejrup, Hans Petter (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 ...