Skip to content

Research at St Andrews

Reconstructing coral calcification fluid dissolved inorganic carbon chemistry from skeletal boron: an exploration of potential controls on coral aragonite B/Ca

Research output: Contribution to journalArticle


The boron geochemistry of coral skeletons reflects the dissolved inorganic carbon (DIC) chemistry of the calcification fluid from which the skeletons precipitates and may be a valuable tool to investigate the effects of climate change on coral calcification. In this paper I calculate the predicted B/Ca of aragonite precipitating from seawater based fluids as a function of pH, [DIC] and [Ca2+]. I consider how different co-precipitating DIC species affect aragonite B/Ca and also estimate the impact of variations in the B(OH)4/co-precipitating DIC aragonite partition coefficient (KD), which may be associated with changes in the DIC and Ca2+ chemistry of the calcification fluid. The coral skeletal B/Ca versus calcification fluid pH relationships reported previously can be reproduced by estimating B(OH)4 and co-precipitating DIC speciation as a function of pHCF and assuming that KD are constant i.e. unaffected by calcification fluid saturation state. Assuming that B(OH)4 co-precipitates with CO32−, then observed patterns can be reproduced by a fluid with approximately constant [DIC] i.e. increasing pHCF concentrates CO32−, as a function of DIC speciation. Assuming that B(OH)4co-precipitates with HCO3only or CO32− + HCO3 then the observed patterns can be reproduced if [DIC]CF and pHCF are positively related i.e. if DIC is increasingly concentrated in the calcification fluid at higher pHCF probably by CO2 diffusion into the calcification site.


Original languageEnglish
Article numbere00387
Number of pages22
Issue number8
Early online date30 Aug 2017
Publication statusPublished - Aug 2017

    Research areas

  • Geochemistry, Geology, Oceanography

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. The effect of ocean acidification on tropical coral calcification: insights from calcification fluid DIC chemistry

    Allison, N., Cole, C., Hintz, C., Hintz, K., Rae, J. & Finch, A., 10 Oct 2018, In : Chemical Geology. 497, p. 162-169 8 p.

    Research output: Contribution to journalArticle

  2. Corals concentrate dissolved inorganic carbon to facilitate calcification

    Allison, N., Cohen, I., Finch, A. A., Erez, J. & Tudhope, A. W., 22 Dec 2014, In : Nature Communications. 5, 5741.

    Research output: Contribution to journalArticle

ID: 251006820