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    The relationship between silicon isotope fractionation in sponges and silicic acid concentration : modern and core-top studies of biogenic opal

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    modern-sponge-final-ms.pdf (974.0Kb)
    Date
    2011-11-14
    Author
    Hendry, Katharine R.  Concept link
    Robinson, Laura F.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/5093
    As published
    https://doi.org/10.1016/j.gca.2011.12.010
    Abstract
    Recent work has shown the silicon isotope composition, denoted by δ30Si, of deep-sea sponges reflects the concentration of ambient silicic acid (Si(OH)4) in seawater. However, existing calibrations are based predominantly on living sponges collected from the Southern Ocean. These data cannot, however, be used to determine whether other parameters that correlate with silicic acid in the Southern Ocean, such as temperature and salinity, influence δ30Si of sponges. Furthermore, the published data do not demonstrate whether disaggregated core-top sedimentary spicules preserve the primary δ30Si signal recorded in living sponges. Here, we address both of these issues. We refine and widen the existing calibration by including a global distribution of modern sponges. In addition, we provide the first systematic calibration from spicules picked from core-top sediments that covers sites from different ocean basins. The relationship between Si(OH)4 and δ30Si in sponge spicules is the same in different ocean basins, between specimens that grew in different temperature and salinity conditions. Our core-top data agree well with the modern sponge calibration indicating there are no significant post-depositional effects or early diagenetic overprints. These two new datasets support the assertion that sponge δ30Si can be used as a proxy for silicic acid concentrations in the past.
    Description
    Author Posting. © The Author(s), 2011. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Geochimica et Cosmochimica Acta 81 (2012): 1-12, doi:10.1016/j.gca.2011.12.010.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Preprint: Hendry, Katharine R., Robinson, Laura F., "The relationship between silicon isotope fractionation in sponges and silicic acid concentration : modern and core-top studies of biogenic opal", 2011-11-14, https://doi.org/10.1016/j.gca.2011.12.010, https://hdl.handle.net/1912/5093
     
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