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1. Effect of seawater carbonate concentration on foraminiferal carbon and oxygen isotopes

Author

Spero, Howard J., Bijma, Jelle, Lea, David W., and Bemis, Bryan E.

Subjects
Climatic changes -- Research, Plankton research -- Observations, Paleontology -- Proterozoic, Carbon -- Isotopes, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

The 18 O/16 O ratio and 13 C/12 C ratios of the calcite shells of living non-symbiotic and symbiotic plankton foraminifera decline when seawater increases. Standard glacial foraminiferal stable-isotope information does not predict this finding, nor does it support the hypothesis that a transfer of terrestrial carbon into the sea could have produced the glacial-interglacial change in the 13 C/12 C ratio. The extreme stable-isotope differences in the Phanerozoic and Proterozoic aeons may be explained by the carbonate-concentration effect.

Published
1997

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