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Isotopic signature of dissolved iron delivered to the Southern Ocean from hydrothermal vents in the East Scotia Sea
Univ Southampton, Ocean & Earth Sci, Natl Oceanog Ctr Southampton, Waterfront Campus,European Way, Southampton SO14 3ZH, Hants, England.;Univ Toulouse, LEGOS, IRD, CNES,CNRS,UPS, 18 Ave Edouard Belin, F-31401 Toulouse, France..
Univ Southampton, Ocean & Earth Sci, Natl Oceanog Ctr Southampton, Waterfront Campus,European Way, Southampton SO14 3ZH, Hants, England..
Natl Oceanog Ctr Southampton, Marine Geosci, European Way, Southampton SO14 3ZH, Hants, England.;Southern Cross Geosci, Mil Rd, Lismore, NSW 2480, Australia..
Univ Southampton, Ocean & Earth Sci, Natl Oceanog Ctr Southampton, Waterfront Campus,European Way, Southampton SO14 3ZH, Hants, England..
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2017 (English)In: Geology, ISSN 0091-7613, E-ISSN 1943-2682, Vol. 45, no 4, 351-354 p.Article in journal (Refereed) Published
Abstract [en]

It has recently been demonstrated that hydrothermal vents are an important source of dissolved Fe (dFe) to the Southern Ocean. The isotopic composition (delta Fe-56) of dFe in vent fluids appears to be distinct from other sources of dFe to the deep ocean, but the evolution of delta Fe-56 during mixing between vent fluids and seawater is poorly constrained. Here we present the evolution of delta Fe-56 for dFe in hydrothermal fluids and dispersing plumes from two sites in the East Scotia Sea. We show that delta Fe-56 values in the buoyant plume are distinctly lower (as low as -1.19 parts per thousand) than the hydrothermal fluids (-0.29 parts per thousand), attributed to (1) precipitation of Fe sulfides in the early stages of mixing, and (2) partial oxidation of Fe(II) to Fe(III), >55% of which subsequently precipitates as Fe oxyhydroxides. By contrast, the delta Fe-56 signature of stabilized dFe in the neutrally buoyant plume is -0.3 parts per thousand to -0.5 parts per thousand. This cannot be explained by continued dilution of the buoyant plume with background seawater; rather, we suggest that isotope fractionation of dFe occurs during plume dilution due to Fe ligand complexation and exchange with labile particulate Fe. The delta Fe-56 signature of stabilized hydrothermal dFe in the East Scotia Sea is distinct from background seawater and may be used to quantify the hydrothermal dFe input to the ocean interior.

Place, publisher, year, edition, pages
2017. Vol. 45, no 4, 351-354 p.
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Earth and Related Environmental Sciences
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URN: urn:nbn:se:uu:diva-318914DOI: 10.1130/G38432.1ISI: 000396125700018OAI: oai:DiVA.org:uu-318914DiVA: diva2:1087038
Available from: 2017-04-05 Created: 2017-04-05 Last updated: 2017-04-05Bibliographically approved

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