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Sea-Level Estimates during the Last Deglaciation Based on δ18O and Accelerator Mass Spectrometry 14C Ages Measured in Globigerina bulloides

Published online by Cambridge University Press:  20 January 2017

Edouard Bard ,
Richard Fairbanks ,
Maurice Arnold ,
Pierre Maurice ,
Josette Duprat ,
Jean Moyes  and
Jean-Claude Duplessy
Edouard Bard
Affiliation:
Centre des Faibles Radioactivités, CNRS-CEA, 91190 Gif-sur-Yvette, France Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York 10964
Richard Fairbanks
Affiliation:
Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York 10964
Maurice Arnold
Affiliation:
Centre des Faibles Radioactivités, CNRS-CEA, 91190 Gif-sur-Yvette, France
Pierre Maurice
Affiliation:
Centre des Faibles Radioactivités, CNRS-CEA, 91190 Gif-sur-Yvette, France
Josette Duprat
Affiliation:
Institut de Géologie du Bassin d'Aquitaine, Université de Bordeaux, 1, Talence, France
Jean Moyes
Affiliation:
Institut de Géologie du Bassin d'Aquitaine, Université de Bordeaux, 1, Talence, France
Jean-Claude Duplessy
Affiliation:
Centre des Faibles Radioactivités, CNRS-CEA, 91190 Gif-sur-Yvette, France
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Abstract

Coupled measurements of δ18O and accelerator mass spectrometry (AMS) 14C in a particular species of planktonic foraminifera may be used to calculate sea-level estimates for the last deglaciation. Of critical importance for this type of study is a knowledge of the seasonality of foraminiferal growth, which can be provided by δ18O measurements of modern shells (core tops, plankton tows). Isotopic (δ18O, AMS-14C dating) and faunal records (transfer function sea surface temperature) were obtained from two cores in the North Atlantic at about 37°N. The locations were chosen to obtain high sedimentation rate records removed from the major ice-melt discharge areas of the last deglaciation. Based upon Globigerina bulloides data, four δ18O-based sea-level estimates were calculated: −67 ± 7 m at 12,200 yr B.P. and −24 ± 8 m at about 8200 yr B.P. for core SU 81-18; −83 ± 10 m at 12,200 yr B.P. and −13 ± 11 m at about 8500 yr B.P. for core SU 81-14. Using a second working hypothesis concerning the seasonability of G. bulloides growth, it is suggested that the sea-level rose by about 40 m during the millennium which followed 14,500 yr B.P.

Type
Research Article
Information
Quaternary Research , Volume 31 , Issue 3 , May 1989 , pp. 381 - 391
Copyright
University of Washington

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