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Silicon isotopes in Antarctic sponges: an interlaboratory comparison

Hendry, Katharine Rosemary, Leng, Melanie J., Robinson, Laura F., Sloane, Hilary J., Blusztjan, Jerzy, Rickaby, Rosalind E. M., Georg, R. Bastian and Halliday, Alex N. 2011. Silicon isotopes in Antarctic sponges: an interlaboratory comparison. Antarctic Science 23 (1) , pp. 34-42. 10.1017/S0954102010000593

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Abstract

Cycling of deepwater silicon (Si) within the Southern Ocean, and its transport into other ocean basins, may be an important player in the uptake of atmospheric carbon, and global climate. Recent work has shown that the Si isotope (denoted by δ29Si or δ30Si) composition of deep sea sponges reflects the availability of dissolved Si during growth, and is a potential proxy for past deep and intermediate water silicic acid concentrations. As with any geochemical tool, it is essential to ensure analytical precision and accuracy, and consistency between methodologies and laboratories. Analytical bias may exist between laboratories, and sponge material may have matrix effects leading to offsets between samples and standards. Here, we report an interlaboratory evaluation of Si isotopes in Antarctic and sub-Antarctic sponges. We review independent methods for measuring Si isotopes in sponge spicules. Our results show that separate subsamples of non-homogenized sponges measured by three methods yield isotopic values within analytical error for over 80% of specimens. The relationship between δ29Si and δ30Si in sponges is consistent with kinetic fractionation during biomineralization. Sponge Si isotope analyses show potential as palaeoceaongraphic archives, and we suggest Southern Ocean sponge material would form a useful additional reference standard for future spicule analyses.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Uncontrolled Keywords: Biogeochemistry ; Calibration ; Nutrient ; Porifera ; Silicic acid ; Southern Ocean
Additional Information: Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0954-1020/ (accessed 21/02/2014).
Publisher: Cambridge University Press
ISSN: 0954-1020
Date of First Compliant Deposit: 30 March 2016
Last Modified: 23 Mar 2017 02:44
URI: http://orca.cf.ac.uk/id/eprint/7519

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