Paleontology

Evidence of high Sr/Ca in a Middle Jurassic murolith coccolith species

10.24072/pcjournal.20 - Peer Community Journal, Volume 1 (2021), article no. e25.

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Paleoceanographical reconstructions are often based on microfossil geochemical analyses. Coccoliths are the most ancient, abundant and continuous record of pelagic photic zone calcite producer organisms. Hence, they could be valuable substrates for geochemically based paleoenvironmental reconstructions but only Sr/Ca is exploited even if it remains poorly understood. For example, some murolith coccoliths species have very high Sr/Ca compared to the common 1-4 mmol/mol recorded in placolith coccoliths. In this study, we analyzed the elemental composition of the Middle Jurassic murolith Crepidolithus crassus by synchrotron-based nanoXRF (X-ray Fluorescence Spectroscopy) mapping focusing on Sr/Ca and compared the record to two placolith species, namely Watznaueria contracta and Discorhabdus striatus. In C. crassus, Sr/Ca is more than ten times higher than in both placoliths and seems higher in the proximal cycle. By comparison with the placoliths analyzed in the same analytical set-up and from the same sample, we exclude the impact of the diagenesis and seawater Sr/Ca to explain the high Sr/Ca in C. crassus. Based on comparisons to Pontosphaera discopora and Scyphosphaera apsteinii which also have high Sr/Ca, it seems more likely that high Sr/Ca in C. crassus is either due to the vertical elongation of the R-units of the proximal cycle or related to the action of the special polysaccharide controlling the growth of those vertically elongated R-units that may have affinities to Sr2+. In order to apply the Sr/Ca proxy to muroliths, further investigations are needed on cultured coccoliths.

Published online:
DOI: 10.24072/pcjournal.20
Suchéras-Marx, Baptiste 1; Giraud, Fabienne 2, 3; Simionovici, Alexandre 2, 4, 3; Tucoulou, Rémi 5; Daniel, Isabelle 6

1 Aix Marseille Univ, CNRS, IRD, INRAE, Coll France, CEREGE - Aix-en-Provence, France
2 CNRS, ISTerre – Grenoble, France
3 Université Grenoble-Alpes, ISTerre – Grenoble, France
4 Institut Universitaire de France (IUF)
5 ESRF – The European Synchrotron Radiation Facility – Grenoble, France
6 UMR CNRS 5276 LGL, Université Claude Bernard Lyon 1, Ecole Normale Supérieure de Lyon – Villeurbanne, France
License: CC-BY 4.0
Copyrights: The authors retain unrestricted copyrights and publishing rights
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Suchéras-Marx, Baptiste; Giraud, Fabienne; Simionovici, Alexandre; Tucoulou, Rémi; Daniel, Isabelle. Evidence of high Sr/Ca in a Middle Jurassic murolith coccolith species. Peer Community Journal, Volume 1 (2021), article  no. e25. doi : 10.24072/pcjournal.20. https://peercommunityjournal.org/articles/10.24072/pcjournal.20/

Peer reviewed and recommended by PCI : 10.24072/pci.paleo.100006

Conflict of interest of the recommender and peer reviewers:
The recommender in charge of the evaluation of the article and the reviewers declared that they have no conflict of interest (as defined in the code of conduct of PCI) with the authors or with the content of the article.

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