Skip to content

Research at St Andrews

Strontium in coral aragonite: 3. Sr coordination and geochemistry in relation to skeletal architecture

Research output: Contribution to journalArticle

Author(s)

Nicola Allison, Adrian Anthony Finch, M Newville, SV Sutton

School/Research organisations

Abstract

Use of the coral Sr palaeothermometer assumes that the Sr in coral skeletons is substituted randomly for Ca in the aragonite structure. The presence of Sr in additional phases e.g., strontianite, or the non random distribution of Sr across metal sites in aragonite, would complicate the Sr/Ca-sea surface temperature relationship. We have used Sr K-edge microEXAFS (extended X-ray absorption fine structure) to determine the structural state of Sr across selected microvolumes of four coral skeletons (Porites lobata, Acropora palmata, Pavona clavus, and Montastrea annularis). We used a 5 X 3 Am beam to analyse specific areas of the coral skeletal architecture, i.e., centres of calcification, fasciculi, and dissepiments. All EXAFS analyses refine, within error, to an ideally substituted Sr in aragonite, and we found no evidence of strontianite or partly ordered structural states. Anisotropy in the first shell responses results from the fact that the analysed microvolumes are not necessarily averaged for the responses of all crystal orientations in the aragonite. Although secondary ion mass spectrometry confirmed that Sr/Ca composition can vary substantially between skeletal components, we find no evidence for any contrast in Sr structural state. Sr heterogeneity may result from kinetic effects, reflecting complex disequilibrium processes during crystal precipitation, or biological effects, resulting from variations in the composition of the calcifying fluid which are biologically mediated. Copyright (c) 2005 Elsevier Ltd.

Close

Details

Original languageEnglish
Pages (from-to)3801-3811
Number of pages11
JournalGeochimica et Cosmochimica Acta
Volume69
DOIs
Publication statusPublished - 1 Aug 2005

    Research areas

  • GALAXEA-FASCICULARIS, STYLOPHORA-PISTILLATA, GROWTH, PHOTOSYNTHESIS, CALCIFICATION, MECHANISM, SURFACE, TEMPERATURE, RECORDS, SR/CA

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

Related by journal

  1. Effects of pH on redox proxies in a Jurassic rift lake: implications for interpreting environmental records in deep time

    Stüeken, E. E., Martinez, A., Love, G., Olsen, P. E., Bates, S. & Lyons, T. W., 18 Mar 2019, In : Geochimica et Cosmochimica Acta. 252, p. 240-267

    Research output: Contribution to journalArticle

  2. Isotopic fractionation of zirconium during magmatic differentiation and the stable isotope composition of the silicate Earth

    Inglis, E., Moynier, F., Creech, J., Deng, Z., Day, J., Teng, F-Z., Bizzarro, M., Jackson, M. & Savage, P., 1 Apr 2019, In : Geochimica et Cosmochimica Acta. 250, p. 311-323 13 p.

    Research output: Contribution to journalArticle

  3. Records of carbon and sulfur cycling during the Silurian Ireviken Event in Gotland, Sweden

    Rose, C., Fischer, W. W., Finnegan, S. & Fike, D. A., 1 Feb 2019, In : Geochimica et Cosmochimica Acta. 246, p. 299-316 18 p.

    Research output: Contribution to journalArticle

  4. Assessing foraminifera biomineralisation models through trace element data of cultures under variable seawater chemistry

    Evans, D., Müller, W. & Erez, J., 8 Mar 2018, In : Geochimica et Cosmochimica Acta. In press

    Research output: Contribution to journalArticle

  5. Coupled Mg/Ca and clumped isotope analyses of foraminifera provide consistent water temperatures

    Breitenbach, S. F. M., Mleneck-Vautravers, M. J., Grauel, A. L., Lo, L., Bernasconi, S. M., Müller, I. A., Rolfe, J., Gázquez, F., Greaves, M. & Hodell, D. A., 1 Sep 2018, In : Geochimica et Cosmochimica Acta. 236, p. 283-296 14 p.

    Research output: Contribution to journalArticle

ID: 269588