Skip to Main content Skip to Navigation
Journal articles

Assessing kinetic fractionation in brachiopod calcite using clumped isotopes

Abstract : 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.
Complete list of metadatas

Cited literature [79 references]  Display  Hide  Download

https://hal-insu.archives-ouvertes.fr/insu-02160318
Contributor : Eva Fareau <>
Submitted on : Wednesday, June 19, 2019 - 3:18:36 PM
Last modification on : Friday, March 27, 2020 - 2:10:05 AM

File

s41598-017-17353-7.pdf
Publisher files allowed on an open archive

Identifiers

Collections

Citation

David Bajnai, Jens Fiebig, Adam Tomašových, Sara Garcia, Claire Rollion-Bard, et al.. Assessing kinetic fractionation in brachiopod calcite using clumped isotopes. Scientific Reports, Nature Publishing Group, 2018, 8, pp.533. ⟨10.1038/s41598-017-17353-7⟩. ⟨insu-02160318⟩

Share

Metrics

Record views

315

Files downloads

750