Articles | Volume 20, issue 24
https://doi.org/10.5194/bg-20-5177-2023
https://doi.org/10.5194/bg-20-5177-2023
Research article
 | 
21 Dec 2023
Research article |  | 21 Dec 2023

Impact of seawater sulfate concentration on sulfur concentration and isotopic composition in calcite of two cultured benthic foraminifera

Caroline Thaler, Guillaume Paris, Marc Dellinger, Delphine Dissard, Sophie Berland, Arul Marie, Amandine Labat, and Annachiara Bartolini

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This preprint is open for discussion and under review for Biogeosciences (BG).
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Cited articles

Algeo, T. J., Luo, G. M., Song, H. Y., Lyons, T. W., and Canfield, D. E.: Reconstruction of secular variation in seawater sulfate concentrations, Biogeosciences, 12, 2131–2151, https://doi.org/10.5194/bg-12-2131-2015, 2015. 
Assayag, N., Rivé, K., Ader, M., Jézéquel, D., and Agrinier, P.: Improved method for isotopic and quantitative analysis of dissolved inorganic carbon in natural water samples, Rapid Commun. Mass Sp., 20, 2243–2251, 2006. 
Balan, E., Blanchard, M., Pinilla, C., and Lazzeri, M.: First-principles modeling of sulfate incorporation and 34S /32S isotopic fractionation in different calcium carbonates, Chem. Geol., 374/375, 84–91, https://doi.org/10.1016/j.chemgeo.2014.03.004, 2014. 
Barkan, Y., Paris, G., Webb, S. M., Adkins, J. F., and Halevy, I.: Sulfur isotope fractionation between aqueous and carbonate-associated sulfate in abiotic calcite and aragonite, Geochim. Cosmochim. Ac., 280, 317–339, https://doi.org/10.1016/j.gca.2020.03.022, 2020. 
Bé, A. W., Hemleben, C., Anderson, O. R., and Spindler, M.: Chamber formation in planktonic foraminifera, Micropaleontology, 25, 294–307, https://doi.org/10.2307/1485304, 1979. 
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Our study focuses on one of the most used microfossils in paleoenvironmental reconstructions: foraminifera. We set up a novel approach of long-term cultures under variable and controlled conditions. Our results highlight that foraminiferal tests can be used as a unique record of both SO42−/CaCO3 and δ34S seawater variation. This establishes geological formations composed of biogenic carbonates as a potential repository of paleoenvironmental seawater sulfate chemical and geochemical variation.
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