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    Mg in aragonitic bivalve shells: Seasonal variations and mode of incorporation in Arctica islandica

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    Publication date
    2008
    Author
    Foster, L.C.
    Finch, A.A.
    Clarke, Leon J.
    Andersson, C.
    Allison, N.
    Keyword
    Arctica islandica
    Bivalve shells
    Climate reconstruction
    X-ray Absorption Near Edge Spectroscopy (XANES)
    Irvine Bay, NW Scotland
    Shell Mg/Ca
    Peer-Reviewed
    Yes
    
    Metadata
    Show full item record
    Abstract
    The potential of Mg in Arctica islandica as a climate proxy is explored through analysis of live-collected shells from Irvine Bay, NW Scotland. Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) analysis of the right hand valve from two specimens indicates that seasonal Mg/Ca variations do not correlate with seawater temperature. The highest Mg/Ca typically occurs at the annual growth checks in ~ November¿February. Mg/Ca variations between growth checks are significant in one specimen but usually not significant in the other. Mg/Ca measurements taken laterally across the band (i.e. perpendicular to direction of the growth) to determine heterogeneity of the aragonite deposited at the same time indicates that Mg/Ca concentration decreases with increasing distance from the periostracum in both shells. X-ray Absorption Near Edge Spectroscopy (XANES) indicates that Mg is not substituted into aragonite but is hosted by a disordered phase e.g. organic components or nanoparticles of an inorganic phase. Shell Mg/Ca variations may reflect changes in the concentration or composition of the disorded phase, as well as changes in the composition of the extrapallial fluid used for calcification. Such changes could reflect the relative transportation rates of Mg and Ca to the calcification site.
    URI
    http://hdl.handle.net/10454/4766
    Version
    published version paper
    Citation
    Foster, L. C., Finch, A. A., Allison, N., Andersson, C. and Clarke, L. J. (2008). Mg in aragonitic bivalve shells: Seasonal variations and mode of incorporation in Arctica islandica. Chemical Geology. Vol. 254, No. 1/2, pp. 113-119.
    Link to publisher’s version
    http://dx.doi.org/10.1016/j.chemgeo.2008.06.007
    Type
    Article
    Collections
    Life Sciences Publications

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