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AMS Radiocarbon Dates on Foraminifera from Deep Sea Sediments

Published online by Cambridge University Press:  18 July 2016

Michael Andree
Affiliation:
Physics Institute, University of Berne, Switzerland
Hans Oeschger
Affiliation:
Physics Institute, University of Berne, Switzerland
W S Broecker
Affiliation:
Lamont-Doherty Geological Observatory, Columbia University, New York
Nancy Beavan
Affiliation:
Lamont-Doherty Geological Observatory, Columbia University, New York
Alan Mix
Affiliation:
College of Oceanography, Oregon State University, Corvallis
Georges Bonani
Affiliation:
Institut für Mittelenergiephysik, ETH Hönggerberg, Zürich
H J Hofmann
Affiliation:
Institut für Mittelenergiephysik, ETH Hönggerberg, Zürich
Elvezio Morenzoni
Affiliation:
Institut für Mittelenergiephysik, ETH Hönggerberg, Zürich
Marzio Nessi
Affiliation:
Institut für Mittelenergiephysik, ETH Hönggerberg, Zürich
Martin Suter
Affiliation:
Institut für Mittelenergiephysik, ETH Hönggerberg, Zürich
Willy Wölfli
Affiliation:
Institut für Mittelenergiephysik, ETH Hönggerberg, Zürich
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Abstract

14C ages were determined on samples of foraminifera separated from cores from three areas of the tropical Pacific (East Pacific Rise, Oontong Java Plateau, and South China Sea). Analyses were made on four planktonic species and on mixed benthics. The purpose of the multiple analysis on planktonic species is to assess the importance of artifacts resulting from the bioturbation-abundance change couple, from the bioturbation-partial dissolution couple and from redeposition by bottom currents. The goal is to use the benthic-planktonic age difference as a means of establishing changes in deep sea ventilation rate over the past 25,000 years. Results of a part of this work are presented in this paper.

Type
IV. Methods and Applications
Copyright
Copyright © The American Journal of Science 

References

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Broecker, W S, Mix, A, Andrée, M and Oeschger, H, 1984, Radiocarbon measurements on coexisting benthic and planktic foraminifera shells: potential for reconstructing ocean ventilation times over the past 20,000 years: Nuclear Instruments & Methods, v 233 p 331339.CrossRefGoogle Scholar
Broecker, W S, Toggweiler, R, Patzert, W, and Stuiver, M, in press, Hydrography, chemistry and radioisotopes in the Southeast Asian Basins: Jour Geophys Research. Google Scholar
Damon, P E, 1982, Fluctuation of atmospheric radiocarbon and the radiocarbon timescale, in Currie, L A, ed, Nuclear and chemical dating techniques: ACS symposium ser no. 1 76, p 233244.Google Scholar
Siegenthaler, U, Heimann, M and Oeschger, H, 1980, 14C variations caused by changes in the global carbon cycle, in Stuiver, M and Kra, R S, eds, Internatl 14C conf, 10th, Proc: Radiocarbon, v 22, no. 2, p 177191.Google Scholar

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