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Isotopic signature ...
Isotopic signature of dissolved iron delivered to the Southern Ocean from hydrothermal vents in the East Scotia Sea
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- Klar, Jessica K. (författare)
- 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.
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- James, Rachael H. (författare)
- Univ Southampton, Ocean & Earth Sci, Natl Oceanog Ctr Southampton, Waterfront Campus,European Way, Southampton SO14 3ZH, Hants, England.
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- Gibbs, Dakota (författare)
- Natl Oceanog Ctr Southampton, Marine Geosci, European Way, Southampton SO14 3ZH, Hants, England.;Southern Cross Geosci, Mil Rd, Lismore, NSW 2480, Australia.
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- Lough, Alastair (författare)
- Univ Southampton, Ocean & Earth Sci, Natl Oceanog Ctr Southampton, Waterfront Campus,European Way, Southampton SO14 3ZH, Hants, England.
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- Parkinson, Ian (författare)
- Univ Bristol, Sch Earth Sci, Queens Rd, Bristol BS8 1RJ, Avon, England.
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- Milton, J. Andrew (författare)
- Univ Southampton, Ocean & Earth Sci, Natl Oceanog Ctr Southampton, Waterfront Campus,European Way, Southampton SO14 3ZH, Hants, England.
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- Hawkes, Jeffrey A. (författare)
- Uppsala universitet,Analytisk kemi
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- Connelly, Douglas P. (författare)
- Natl Oceanog Ctr Southampton, Marine Geosci, European Way, Southampton SO14 3ZH, Hants, England.
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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. (creator_code:org_t)
- 2017
- 2017
- Engelska.
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Ingår i: Geology. - 0091-7613 .- 1943-2682. ; 45:4, s. 351-354
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
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