Articles | Volume 20, issue 7
https://doi.org/10.5194/bg-20-1381-2023
https://doi.org/10.5194/bg-20-1381-2023
Research article
 | 
12 Apr 2023
Research article |  | 12 Apr 2023

Multi-proxy assessment of brachiopod shell calcite as a potential archive of seawater temperature and oxygen isotope composition

Thomas Letulle, Danièle Gaspard, Mathieu Daëron, Florent Arnaud-Godet, Arnauld Vinçon-Laugier, Guillaume Suan, and Christophe Lécuyer

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Cited articles

Anand, P., Elderfield, H., and Conte, M. H.: Calibration of Mg/Ca thermometry in planktonic foraminifera from a sediment trap time series: calibration of Mg/Ca thermometry in planktonic foraminifera, Paleoceanography, 18, 1050, https://doi.org/10.1029/2002PA000846, 2003. 
Anderson, N. T., Kelson, J. R., Kele, S., Daëron, M., Bonifacie, M., Horita, J., Mackey, T. J., John, C. M., Kluge, T., Petschnig, P., Jost, A. B., Huntington, K. W., Bernasconi, S. M., and Bergmann, K. D.: A Unified Clumped Isotope Thermometer Calibration (0.5–1,100 C) Using Carbonate-Based Standardization, Geophys. Res. Lett., 48, e2020GL092069, https://doi.org/10.1029/2020GL092069, 2021. 
Auclair, A.-C., Joachimski, M. M., and Lécuyer, C.: Deciphering kinetic, metabolic and environmental controls on stable isotope fractionations between seawater and the shell of Terebratalia transversa (Brachiopoda), Chem. Geol., 202, 59–78, https://doi.org/10.1016/S0009-2541(03)00233-X, 2003. 
Ayling, B. F., McCulloch, M. T., Gagan, M. K., Stirling, C. H., Andersen, M. B., and Blake, S. G.: Sr/Ca and δ18O seasonality in a Porites coral from the MIS 9 (339–303 ka) interglacial, Earth Planet. Sc. Lett., 248, 462–475, https://doi.org/10.1016/j.epsl.2006.06.009, 2006. 
Bajnai, D., Fiebig, J., Tomašových, A., Milner Garcia, S., Rollion-Bard, C., Raddatz, J., Löffler, N., Primo-Ramos, C., and Brand, U.: Assessing kinetic fractionation in brachiopod calcite using clumped isotopes, Sci. Rep., 8, 533, https://doi.org/10.1038/s41598-017-17353-7, 2018. 
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Short summary
This paper studies the chemistry of modern marine shells called brachiopods. We investigate the relationship of the chemistry of these shells with sea temperatures to test and develop tools for estimating sea temperatures in the distant past. Our results confirm that two of the investigated chemical markers could be useful thermometers despite some second-order variability independent of temperature. The other chemical markers investigated, however, should not be used as a thermometer.
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