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    Factors affecting B/Ca ratios in synthetic aragonite

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    fullmsForReviewers.pdf (883.7Kb)
    Date
    2015-09
    Author
    Holcomb, Michael  Concept link
    DeCarlo, Thomas M.  Concept link
    Gaetani, Glenn A.  Concept link
    McCulloch, Malcolm  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/8221
    As published
    https://doi.org/10.1016/j.chemgeo.2016.05.007
    Keyword
     Boron; Aragonite; Coral; Proxy; Carbonate 
    Abstract
    Measurements of B/Ca ratios in marine carbonates have been suggested to record seawater carbonate chemistry, however experimental calibration of such proxies based on inorganic partitioning remains limited. Here we conducted a series of synthetic aragonite precipitation experiments to evaluate the factors influencing the partitioning of B/Ca between aragonite and seawater. Our results indicate that the B/Ca ratio of synthetic aragonites depends primarily on the relative concentrations of borate and carbonate ions in the solution from which the aragonite precipitates; not on bicarbonate concentration as has been previously suggested. The influence of temperature was not significant over the range investigated (20 – 40°C), however, partitioning may be influenced by saturation state (and/or growth rate). Based on our experimental results, we suggest that aragonite B/Ca ratios can be utilized as a proxy of [CO32-]. Boron isotopic composition (δ11B) is an established pH proxy, thus B/Ca and δ11B together allow the full carbonate chemistry of the solution from which the aragonite precipitated to be calculated. To the extent that aragonite precipitation by marine organisms is affected by seawater chemistry, B/Ca may also prove useful in reconstructing seawater chemistry. A simplified boron purification protocol based on amberlite resin and the organic buffer TRIS is also described.
    Description
    Author Posting. © The Author(s), 2015. This is the author's version of the work. It is posted here for personal use, not for redistribution. The definitive version was published in Chemical Geology 437 (2016): 67-76, doi:10.1016/j.chemgeo.2016.05.007.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Preprint: Holcomb, Michael, DeCarlo, Thomas M., Gaetani, Glenn A., McCulloch, Malcolm, "Factors affecting B/Ca ratios in synthetic aragonite", 2015-09, https://doi.org/10.1016/j.chemgeo.2016.05.007, https://hdl.handle.net/1912/8221
     

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