%0 Journal Article %T Assessing kinetic fractionation in brachiopod calcite using clumped isotopes %+ Institut für Geowissenschaften [Frankfurt am Main] %+ Institute of Earth Sciences %+ Institut de Physique du Globe de Paris (IPGP) %+ Institut für Atmosphäre und Umwelt [Frankfurt/Main] (IAU) %+ Brock University [Canada] %A Bajnai, David %A Fiebig, Jens %A Tomašových, Adam %A Garcia, Sara, Milner %A Rollion-Bard, Claire %A Raddatz, Jacek %A Löffler, Niklas %A Primo-Ramos, Cristina %A Brand, Uwe %< avec comité de lecture %@ 2045-2322 %J Scientific Reports %I Nature Publishing Group %V 8 %P 533 %8 2018 %D 2018 %R 10.1038/s41598-017-17353-7 %Z Sciences of the Universe [physics]/Earth Sciences/Geochemistry %Z Sciences of the Universe [physics]/Earth Sciences/ClimatologyJournal articles %X Brachiopod shells are the most widely used geological archive for the reconstruction of the temperature and the oxygen isotope composition of Phanerozoic seawater. However, it is not conclusive whether brachiopods precipitate their shells in thermodynamic equilibrium. In this study, we investigated the potential impact of kinetic controls on the isotope composition of modern brachiopods by measuring the oxygen and clumped isotope compositions of their shells. Our results show that clumped and oxygen isotope compositions depart from thermodynamic equilibrium due to growth rate-induced kinetic effects. These departures are in line with incomplete hydration and hydroxylation of dissolved CO 2. These findings imply that the determination of taxon-specific growth rates alongside clumped and bulk oxygen isotope analyses is essential to ensure accurate estimates of past ocean temperatures and seawater oxygen isotope compositions from brachiopods. %G English %Z European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No. 643084 (BASE-LiNE Earth). %2 https://insu.hal.science/insu-02160318/document %2 https://insu.hal.science/insu-02160318/file/s41598-017-17353-7.pdf %L insu-02160318 %U https://insu.hal.science/insu-02160318 %~ INSU %~ UNIV-PARIS7 %~ AFRIQ %~ CNRS %~ IPGP %~ GIP-BE %~ USPC %~ UNIV-PARIS