Fast and pervasive diagenetic isotope exchange in foraminifera tests is species-dependent

Deyanira Cisneros-Lazaro (), Arthur Adams, Jinming Guo, Sylvain Bernard, Lukas P. Baumgartner, Damien Daval, Alain Baronnet, Olivier Grauby, Torsten Vennemann, Jarosław Stolarski, Stéphane Escrig and Anders Meibom ()
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Deyanira Cisneros-Lazaro: Ecole Polytechnique Fédérale de Lausanne (EPFL)
Arthur Adams: Ecole Polytechnique Fédérale de Lausanne (EPFL)
Jinming Guo: Ecole Polytechnique Fédérale de Lausanne (EPFL)
Sylvain Bernard: Sorbonne Université
Lukas P. Baumgartner: University of Lausanne
Damien Daval: IFSTTAR
Alain Baronnet: Aix-Marseille Université
Olivier Grauby: Aix-Marseille Université
Torsten Vennemann: University of Lausanne
Jarosław Stolarski: Polish Academy of Sciences
Stéphane Escrig: Ecole Polytechnique Fédérale de Lausanne (EPFL)
Anders Meibom: Ecole Polytechnique Fédérale de Lausanne (EPFL)

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract Oxygen isotope compositions of fossil foraminifera tests are commonly used proxies for ocean paleotemperatures, with reconstructions spanning the last 112 million years. However, the isotopic composition of these calcitic tests can be substantially altered during diagenesis without discernible textural changes. Here, we investigate fluid-mediated isotopic exchange in pristine tests of three modern benthic foraminifera species (Ammonia sp., Haynesina germanica, and Amphistegina lessonii) following immersion into an 18O-enriched artificial seawater at 90 °C for hours to days. Reacted tests remain texturally pristine but their bulk oxygen isotope compositions reveal rapid and species-dependent isotopic exchange with the water. NanoSIMS imaging reveals the 3-dimensional intra-test distributions of 18O-enrichment that correlates with test ultra-structure and associated organic matter. Image analysis is used to quantify species level differences in test ultrastructure, which explains the observed species-dependent rates of isotopic exchange. Consequently, even tests considered texturally pristine for paleo-climatic reconstruction purposes may have experienced substantial isotopic exchange; critical paleo-temperature record re-examination is warranted.

Date: 2022
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DOI: 10.1038/s41467-021-27782-8

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