Isotopic signature of dissolved iron delivered to the Southern Ocean from hydrothermal vents in the East Scotia Sea
It has recently been demonstrated that hydrothermal vents are an important source of dissolved Fe (dFe) to the Southern Ocean. The isotopic composition (?56Fe) of dFe in vent fluids appears to be distinct from other sources of dFe to the deep ocean, but the evolution of ?56Fe during mixing between v...
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Online Access: | https://eprints.soton.ac.uk/403962/ https://eprints.soton.ac.uk/403962/1/ePrints_Klar_Geology_2016.pdf |
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ftsouthampton:oai:eprints.soton.ac.uk:403962 2023-07-30T04:06:41+02:00 Isotopic signature of dissolved iron delivered to the Southern Ocean from hydrothermal vents in the East Scotia Sea Klar, Jessica K. James, Rachael H. Gibbs, Dakota Lough, Alastair Parkinson, Ian Milton, J. Andrew Hawkes, Jeffrey A. Connelly, Douglas P. 2017-04-01 text https://eprints.soton.ac.uk/403962/ https://eprints.soton.ac.uk/403962/1/ePrints_Klar_Geology_2016.pdf en English eng https://eprints.soton.ac.uk/403962/1/ePrints_Klar_Geology_2016.pdf Klar, Jessica K., James, Rachael H., Gibbs, Dakota, Lough, Alastair, Parkinson, Ian, Milton, J. Andrew, Hawkes, Jeffrey A. and Connelly, Douglas P. (2017) Isotopic signature of dissolved iron delivered to the Southern Ocean from hydrothermal vents in the East Scotia Sea. Geology, 45 (4), 351-354. (doi:10.1130/G38432.1 <http://dx.doi.org/10.1130/G38432.1>). Article PeerReviewed 2017 ftsouthampton https://doi.org/10.1130/G38432.1 2023-07-09T22:12:29Z It has recently been demonstrated that hydrothermal vents are an important source of dissolved Fe (dFe) to the Southern Ocean. The isotopic composition (?56Fe) of dFe in vent fluids appears to be distinct from other sources of dFe to the deep ocean, but the evolution of ?56Fe during mixing between vent fluids and seawater is poorly constrained. Here we present the evolution of ?56Fe for dFe in hydrothermal fluids and dispersing plumes from two sites in the East Scotia Sea. We show that ?56Fe values in the buoyant plume are distinctly lower (as low as ?1.19 ‰) than the hydrothermal fluids (?0.29 ‰), attributed to (i) precipitation of Fe-sulfides in the early stages of mixing, and (ii) partial oxidation of Fe(II) to Fe(III), > 55 % of which subsequently precipitates as Fe-oxyhydroxides. By contrast, the ?56Fe signature of stabilized dFe in the neutrally buoyant plume is ?0.3 to ?0.5 ‰. 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 ?56Fe 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. Article in Journal/Newspaper Scotia Sea Southern Ocean University of Southampton: e-Prints Soton Scotia Sea Southern Ocean Geology 45 4 351 354 |
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Open Polar |
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University of Southampton: e-Prints Soton |
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ftsouthampton |
language |
English |
description |
It has recently been demonstrated that hydrothermal vents are an important source of dissolved Fe (dFe) to the Southern Ocean. The isotopic composition (?56Fe) of dFe in vent fluids appears to be distinct from other sources of dFe to the deep ocean, but the evolution of ?56Fe during mixing between vent fluids and seawater is poorly constrained. Here we present the evolution of ?56Fe for dFe in hydrothermal fluids and dispersing plumes from two sites in the East Scotia Sea. We show that ?56Fe values in the buoyant plume are distinctly lower (as low as ?1.19 ‰) than the hydrothermal fluids (?0.29 ‰), attributed to (i) precipitation of Fe-sulfides in the early stages of mixing, and (ii) partial oxidation of Fe(II) to Fe(III), > 55 % of which subsequently precipitates as Fe-oxyhydroxides. By contrast, the ?56Fe signature of stabilized dFe in the neutrally buoyant plume is ?0.3 to ?0.5 ‰. 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 ?56Fe 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. |
format |
Article in Journal/Newspaper |
author |
Klar, Jessica K. James, Rachael H. Gibbs, Dakota Lough, Alastair Parkinson, Ian Milton, J. Andrew Hawkes, Jeffrey A. Connelly, Douglas P. |
spellingShingle |
Klar, Jessica K. James, Rachael H. Gibbs, Dakota Lough, Alastair Parkinson, Ian Milton, J. Andrew Hawkes, Jeffrey A. Connelly, Douglas P. Isotopic signature of dissolved iron delivered to the Southern Ocean from hydrothermal vents in the East Scotia Sea |
author_facet |
Klar, Jessica K. James, Rachael H. Gibbs, Dakota Lough, Alastair Parkinson, Ian Milton, J. Andrew Hawkes, Jeffrey A. Connelly, Douglas P. |
author_sort |
Klar, Jessica K. |
title |
Isotopic signature of dissolved iron delivered to the Southern Ocean from hydrothermal vents in the East Scotia Sea |
title_short |
Isotopic signature of dissolved iron delivered to the Southern Ocean from hydrothermal vents in the East Scotia Sea |
title_full |
Isotopic signature of dissolved iron delivered to the Southern Ocean from hydrothermal vents in the East Scotia Sea |
title_fullStr |
Isotopic signature of dissolved iron delivered to the Southern Ocean from hydrothermal vents in the East Scotia Sea |
title_full_unstemmed |
Isotopic signature of dissolved iron delivered to the Southern Ocean from hydrothermal vents in the East Scotia Sea |
title_sort |
isotopic signature of dissolved iron delivered to the southern ocean from hydrothermal vents in the east scotia sea |
publishDate |
2017 |
url |
https://eprints.soton.ac.uk/403962/ https://eprints.soton.ac.uk/403962/1/ePrints_Klar_Geology_2016.pdf |
geographic |
Scotia Sea Southern Ocean |
geographic_facet |
Scotia Sea Southern Ocean |
genre |
Scotia Sea Southern Ocean |
genre_facet |
Scotia Sea Southern Ocean |
op_relation |
https://eprints.soton.ac.uk/403962/1/ePrints_Klar_Geology_2016.pdf Klar, Jessica K., James, Rachael H., Gibbs, Dakota, Lough, Alastair, Parkinson, Ian, Milton, J. Andrew, Hawkes, Jeffrey A. and Connelly, Douglas P. (2017) Isotopic signature of dissolved iron delivered to the Southern Ocean from hydrothermal vents in the East Scotia Sea. Geology, 45 (4), 351-354. (doi:10.1130/G38432.1 <http://dx.doi.org/10.1130/G38432.1>). |
op_doi |
https://doi.org/10.1130/G38432.1 |
container_title |
Geology |
container_volume |
45 |
container_issue |
4 |
container_start_page |
351 |
op_container_end_page |
354 |
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1772819534583955456 |