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Journal article
Isotopic signature of dissolved iron delivered to the Southern Ocean from hydrothermal vents in the East Scotia Sea
Geology (Boulder), Vol.45(4), pp.351-354
04/2017
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Abstract
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.
Details
- Title
- Isotopic signature of dissolved iron delivered to the Southern Ocean from hydrothermal vents in the East Scotia Sea
- Creators
- Jessica K Klar - University of SouthamptonRachael H James - University of SouthamptonDakota Gibbs - National Oceanography CentreAlastair Lough - University of SouthamptonIan Parkinson - University of BristolJ. Andrew Milton - University of SouthamptonJeffrey A Hawkes - Uppsala UniversityDouglas P Connelly - National Oceanography Centre
- Publication Details
- Geology (Boulder), Vol.45(4), pp.351-354
- Publisher
- Geological Soc Amer, Inc
- Number of pages
- 4
- Grant note
- noc010011 / Natural Environment Research Council; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC) UK Natural Environment Research Council (NERC) National Capability funds; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC) noc010011 / NERC; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC) Graduate School of the National Oceanography Centre, Southampton NE/D01249X/1 / NERC; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC)
- Identifiers
- 991012927070602368
- Academic Unit
- Southern Cross GeoScience
- Language
- English
- Resource Type
- Journal article