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 (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 mixi...
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Uppsala universitet, Analytisk kemi
2017
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ftuppsalauniv:oai:DiVA.org:uu-318914 2023-05-15T18:15:58+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 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-318914 https://doi.org/10.1130/G38432.1 eng eng Uppsala universitet, Analytisk kemi 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 Bristol, Sch Earth Sci, Queens Rd, Bristol BS8 1RJ, Avon, England. Natl Oceanog Ctr Southampton, Marine Geosci, European Way, Southampton SO14 3ZH, Hants, England. Geology, 0091-7613, 2017, 45:4, s. 351-354 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-318914 doi:10.1130/G38432.1 ISI:000396125700018 info:eu-repo/semantics/openAccess Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Article in journal info:eu-repo/semantics/article text 2017 ftuppsalauniv https://doi.org/10.1130/G38432.1 2023-02-23T21:36:48Z 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. Article in Journal/Newspaper Scotia Sea Southern Ocean Uppsala University: Publications (DiVA) Scotia Sea Southern Ocean Geology 45 4 351 354 |
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Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
Earth and Related Environmental Sciences Geovetenskap och miljövetenskap |
spellingShingle |
Earth and Related Environmental Sciences Geovetenskap och miljövetenskap 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 |
topic_facet |
Earth and Related Environmental Sciences Geovetenskap och miljövetenskap |
description |
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. |
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. |
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 |
publisher |
Uppsala universitet, Analytisk kemi |
publishDate |
2017 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-318914 https://doi.org/10.1130/G38432.1 |
geographic |
Scotia Sea Southern Ocean |
geographic_facet |
Scotia Sea Southern Ocean |
genre |
Scotia Sea Southern Ocean |
genre_facet |
Scotia Sea Southern Ocean |
op_relation |
Geology, 0091-7613, 2017, 45:4, s. 351-354 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-318914 doi:10.1130/G38432.1 ISI:000396125700018 |
op_rights |
info:eu-repo/semantics/openAccess |
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 |
_version_ |
1766189301470593024 |