Age determination of North Atlantic sediment cores

Coupled measurements of delta18O 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 gro...

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Bibliographic Details
Main Authors: Bard, Edouard, Fairbanks, Richard G, Maurice, Pierre, Duprat, Josette M, Moyes, Jean, Duplessy, Jean-Claude
Format: Dataset
Language:English
Published: PANGAEA 1989
Subjects:
Atlantic Ocean
CEPAG
Glacial Atlantic Ocean Mapping
GLAMAP
GLAMAP2000
Le Suroît
PC
Piston corer
SU81-14
SU81-18
North Atlantic
Planktonic foraminifera
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.726266
https://doi.org/10.1594/PANGAEA.726266
Description
Summary:Coupled measurements of delta18O 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 delta18O measurements of modern shells (core tops, plankton tows). Isotopic (delta18O, 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 delta18O-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 SU81-18; -83 +/- 10 m at 12,200 yr B.P. and -13 +/- 11 m at about 8500 yr B.P. for core SU81-14. 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.

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