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Oxygen Isotopes in Foraminifera: Overview and Historical Review

Published online by Cambridge University Press:  21 July 2017

Paul N. Pearson
Paul N. Pearson*
Affiliation:
School of Earth and Ocean Sciences, Main Building, Cardiff University, Park Place, Cardiff, CF10 3AT, United Kingdom pearsonp@cardiff.ac.uk
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Abstract

Foraminiferal tests are a common component of many marine sediments. The oxygen isotope ratio (δ18O) of test calcite is frequently used to reconstruct aspects of their life environment. The δ18O depends mainly on the isotope ratio of the water it is precipitated from, the temperature of calcification, and, to a lesser extent, the carbonate ion concentration. Foraminifera and other organisms can potentially preserve their original isotope ratio for many millions of years, although diagenetic processes can alter the ratios. Work on oxygen isotope ratios of foraminifera was instrumental in the discovery of the orbital theory of the ice ages and continues to be widely used in the study of rapid climate change. Compilations of deep sea benthic foraminifer oxygen isotopes have revealed the long history of global climate change over the past 100 million years. Planktonic foraminifer oxygen isotopes are used to investigate the history of past sea surface temperatures, revealing the extent of past ‘greenhouse’ warming and global sea surface temperatures.

Type
Research Article
Information
The Paleontological Society Papers , Volume 18: Reconstructing Earth's Deep-Time Climate , November 2012 , pp. 1 - 38
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Copyright © 2012 by The Paleontological Society 

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