TY  - JOUR
A1  - Bajnai, David
A1  - Fiebig, Jens
A1  - Tomašových, Adam
A1  - Milner Garcia, Sara
A1  - Rollion-Bard, Claire
A1  - Raddatz, Jacek
A1  - Löffler, Niklas
A1  - Primo, Cristina
A1  - Brand, Uwe
T1  - Assessing kinetic fractionation in brachiopod calcite using clumped isotopes
T2  - Scientific reports
N2  - 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 CO2. 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.
KW  - Biogeochemistry
KW  - Marine chemistry
Y1  - 2018
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/45732
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-457329
SN  - 2045-2322
N1  - Open Access: This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Te images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. © The Author(s) 2017
VL  - 8
IS  - 1, Art. 533
SP  - 1
EP  - 12
PB  - Macmillan Publishers Limited, part of Springer Nature
CY  - [London]
ER  -