Clumped-isotope geochemistry of carbonates: A new tool for the reconstruction of temperature and oxygen isotope composition of seawater |
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| Authors: | Stefano M Bernasconi Thomas W Schmid Anna-Lena Grauel Joerg Mutterlose |
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| Institution: | 1. Geological Institute, ETH Zürich, Sonneggstrasse 5, 8092 Zürich, Switzerland;2. Institut für Geologie, Mineralogie und Geophysik, Ruhr Universität Bochum, Universitätsstr. 150, 44801 Bochum, Germany |
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| Abstract: | Clumped-isotope geochemistry deals with the state of ordering of rare isotopes in molecules, in particular with their tendency to form bonds with other rare isotopes rather than with the most abundant ones. Among its possible applications, carbonate clumped-isotope thermometry is the one that has gained most attention because of the wide potential of applications in many disciplines of the earth sciences. In particular, it allows reconstructing the temperature of formation of carbonate minerals without knowledge of the isotopic composition of the water from which they were formed. In addition, the O isotope composition of the waters from which they were formed can be calculated using the δ18O of the same carbonate sample. This feature offers new approaches in paleoclimatology for reconstructing past global geochemical cycles. In this contribution two applications of this method are presented. First the potential of a new analytical method of measurement of clumped isotopes on small samples of foraminifera, for high-resolution SST and seawater δ18O reconstructions from marine sediments is shown. Furthermore the potential of clumped isotope analysis of belemnites, for reconstructing seawater δ18O and temperatures in the Cretaceous is shown. |
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