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Mineralogical Magazine; February 2008; v. 72; no. 1; p. 345-348; DOI: 10.1180/minmag.2008.072.1.345
© 2008 Mineralogical Society of Great Britain and Ireland
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Session 4: Global geochemical cycles and climate change

Nanoparticulate bioavailable iron minerals in icebergs and glaciers

R. Raiswell1, L. G. Benning1,*, L. Davidson1 and M. Tranter2

1 Earth and Biosphere Institute, School of Earth and Environment, Leeds University, Leeds LS2 9JT, UK
2 Bristol Glaciology Centre, School of Geographical Sciences, Bristol University, Bristol BS8 1SS, UK

* E-mail: l.benning{at}see.leeds.ac.uk

ABSTRACT

Ice-hosted sediments in glaciers and icebergs from Antarctica and Svalbard contain authigenic nanoparticulates of schwertmannite, ferrihydrite and goethite that formed during sulphide oxidation. These phases indicate the existence of subglacial biogeochemical hotspots containing fluids of low pH (2–4), rich in dissolved Fe(III) and sulphate. Nanophase Fe is partially bioavailable and potentially important to global biogeochemical cycles, since the flux delivered by icebergs to the Southern Ocean is comparable to the flux of soluble, bioavailable Fe from aeolian dust.






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