δ11B as monitor of calcification site pH in divergent marine calcifying organisms

WOS:000426917500003 International audience The boron isotope composition (delta B-11) of marine biogenic carbonates has been predominantly studied as a proxy for monitoring past changes in seawater pH and carbonate chemistry. However, a number of assumptions regarding chemical kinetics and thermodyn...

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Published in:Biogeosciences
Main Authors: Sutton, Jill, Liu, Yi-Wei, Ries, Justin B., Guillermic, Maxence, Ponzevera, Emmanuel, Eagle, Robert A.
Other Authors: Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR), Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Géosciences Océan (LGO), Université de Bretagne Sud (UBS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Northeastern University Boston, Géosciences Marines (GM), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), University of California Los Angeles (UCLA), University of California (UC), Department of Atmospheric and Oceanic Sciences Los Angeles (AOS), University of California (UC)-University of California (UC), ANR-10-LABX-0019,LabexMER,LabexMER Marine Excellence Research: a changing ocean(2010)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2018
Subjects:
ACL
Online Access:https://hal.archives-ouvertes.fr/hal-02651007
https://hal.archives-ouvertes.fr/hal-02651007/document
https://hal.archives-ouvertes.fr/hal-02651007/file/Sutton_etal_calcification_Biogeosciences_2018.pdf
https://doi.org/10.5194/bg-15-1447-2018
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Summary:WOS:000426917500003 International audience The boron isotope composition (delta B-11) of marine biogenic carbonates has been predominantly studied as a proxy for monitoring past changes in seawater pH and carbonate chemistry. However, a number of assumptions regarding chemical kinetics and thermodynamic isotope exchange reactions are required to derive seawater pH from delta B-11 biogenic carbonates. It is also probable that delta B-11 of biogenic carbonate reflects seawater pH at the organism's site of calcification, which may or may not reflect seawater pH. Here, we report the development of methodology for measuring the delta B-11 of biogenic carbonate samples at the multicollector inductively coupled mass spectrometry facility at Ifremer (Plouzane, France) and the evaluation of delta(BCaCO3)-B-11 in a diverse range of marine calcifying organisms reared for 60 days in isothermal seawater (25 degrees C) equilibrated with an atmospheric pCO(2) of ca. 409 mu atm. Average delta(BCaCO3)-B-11 composition for all species evaluated in this study range from 16.27 to 35.09 %, including, in decreasing order, coralline red alga Neogoniolithion sp. (35.89 +/- 3.71 %), temperate coral Oculina arbuscula (24.12 +/- 0.19 %), serpulid worm Hydroides crucigera (19.26 +/- 0.16 %), tropical urchin Eucidaris tribuloides (18.71 +/- 0.26 %), temperate urchin Arbacia punctulata (16.28 +/- 0.86 %), and temperate oyster Crassostrea virginica (16.03 %). These results are discussed in the context of each species' proposed mechanism of biocalcification and other factors that could influence skeletal and shell delta B-11, including calcifying site pH, the proposed direct incorporation of isotopically enriched boric acid (instead of borate) into biogenic calcium carbonate, and differences in shell/skeleton polymorph mineralogy. We conclude that the large inter-species variability in delta(BCaCO3)-B-11 (ca. 20%) and significant discrepancies between measured delta(BCaCO3)-B-11 and delta(BCaCO3)-B-11 expected from established ...