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Patrizia Ziveri, Heather Stoll, Ian Probert, Christine Klaas, Gerald Ganssen:
Is stable isotope composition of coccolith carbonate an effective paleoceanographic proxy?
(Talk)

Coccolithophores are an important component of the marine phytoplankton and a major contributor to the carbonate in deep-sea sediments. As phytoplankton, their stable isotope composition can provide a sensitive tool for the understanding and reconstruction of the dynamics of photic zone processes. We use several approaches to investigate the origin of species-dependent, non-equilibrium fractionation to evaluate the potential utility of stable isotopes in coccolith calcite for palaeoceanographic and palaeoclimatologic studies. In culture experiments with several species of coccolithophorids, we test the dependency of the stable isotope fractionation on coccolithophorid species growth and calcification. In time series sediment-traps and core-top sediment samples from the Somali Basin, we compared the stable isotope composition of coccoliths (CaCO₃, fraction <32µm) with that of three species of planktonic foraminifera. We will also discuss preliminary results of stable isotope composition of monospecific coccolith assemblages from the Somali trap and sediment samples and the new technique developed for separation of monospecific coccolith assemblages from sediments.

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 [Division of Micropalaeontology] [Department of Geosciences] [Bremen University]

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