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Tracing the Impact of Coastal Water Geochemistry on the Re‐Os Systematics of Macroalgae: Insights From the Basaltic Terrain of Iceland.

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Title: Tracing the Impact of Coastal Water Geochemistry on the Re‐Os Systematics of Macroalgae: Insights From the Basaltic Terrain of Iceland.
Authors: Sproson, Adam D.1,2 a.d.sproson@durham.ac.uk, Selby, David1,3 david.selby@durham.ac.uk, Gannoun, Abdelmouchine4, Burton, Kevin W.1, Dellinger, Mathieu5, Lloyd, Jeremy M.5
Source: Journal of Geophysical Research. Biogeosciences. Sep2018, Vol. 123 Issue 9, p2791-2806. 16p.
Subject Terms: *Biogeochemical cycles, *Estuarine ecology, *Water chemistry, Rhenium, Osmium
Abstract: This study presents rhenium (Re) and osmium (Os) elemental and isotope data for macroalgae, dissolved load, and bed load from Icelandic coastal and/or river waters, an environment adjacent to predominantly basaltic terrains, ranging in age from historic to ~12 Ma. Both the Re (0.1 to 88.4 ppb) and Os (3.3 to 254.5 ppt) abundance in macroalgae are shown to be primarily controlled by uptake from the dissolved load of local seawater and are largely dependent on the relative influence of local freshwater inputs. Incorporation of Re and Os into macroalgae appears to be complicated by additional Re and Os uptake from the bed load. The 187Os/188Os (0.16 to 0.99) composition of macroalgae is highly variable and is explained in terms of an unradiogenic 187Os/188Os contribution from rivers draining younger basaltic catchments that have undergone congruent weathering (and/or hydrothermal input) and a radiogenic 187Os/188Os contribution from two distinct sources: rivers draining older catchments that have undergone incongruent weathering of radiogenic primary basaltic minerals and North Atlantic seawater. The 187Re/188Os composition (~65 to 40,320) of macroalgae traces that of water, with higher values associated with higher salinity waters, but far exceeds the 187Re/188Os of water due to the preferential uptake of Re over Os by macroalgae in areas of high dissolved and/or bed load Re abundances. This study substantiates the utility of macroalgae as a proxy for the long‐term (months to years) average 187Os/188Os composition of seawater, which holds the potential to elucidate a range of Earth system and anthropogenic processes. Key Points: This article contains Re‐Os abundance and isotope data for macroalgae from Icelandic coastal watersIsotope data reflect changes in basaltic weathering and estuarine or coastal mixingThis article provides a novel approach to trace a range of Earth system and anthropogenic processes [ABSTRACT FROM AUTHOR]
Copyright of Journal of Geophysical Research. Biogeosciences is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
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  Data: Tracing the Impact of Coastal Water Geochemistry on the Re‐Os Systematics of Macroalgae: Insights From the Basaltic Terrain of Iceland.
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  Data: <searchLink fieldCode="AR" term="%22Sproson%2C+Adam+D%2E%22">Sproson, Adam D.</searchLink><relatesTo>1,2</relatesTo><i> a.d.sproson@durham.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Selby%2C+David%22">Selby, David</searchLink><relatesTo>1,3</relatesTo><i> david.selby@durham.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Gannoun%2C+Abdelmouchine%22">Gannoun, Abdelmouchine</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Burton%2C+Kevin+W%2E%22">Burton, Kevin W.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Dellinger%2C+Mathieu%22">Dellinger, Mathieu</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Lloyd%2C+Jeremy+M%2E%22">Lloyd, Jeremy M.</searchLink><relatesTo>5</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Biogeosciences%22">Journal of Geophysical Research. Biogeosciences</searchLink>. Sep2018, Vol. 123 Issue 9, p2791-2806. 16p.
– Name: Subject
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  Data: *<searchLink fieldCode="DE" term="%22Biogeochemical+cycles%22">Biogeochemical cycles</searchLink><br />*<searchLink fieldCode="DE" term="%22Estuarine+ecology%22">Estuarine ecology</searchLink><br />*<searchLink fieldCode="DE" term="%22Water+chemistry%22">Water chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Rhenium%22">Rhenium</searchLink><br /><searchLink fieldCode="DE" term="%22Osmium%22">Osmium</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: This study presents rhenium (Re) and osmium (Os) elemental and isotope data for macroalgae, dissolved load, and bed load from Icelandic coastal and/or river waters, an environment adjacent to predominantly basaltic terrains, ranging in age from historic to ~12 Ma. Both the Re (0.1 to 88.4 ppb) and Os (3.3 to 254.5 ppt) abundance in macroalgae are shown to be primarily controlled by uptake from the dissolved load of local seawater and are largely dependent on the relative influence of local freshwater inputs. Incorporation of Re and Os into macroalgae appears to be complicated by additional Re and Os uptake from the bed load. The 187Os/188Os (0.16 to 0.99) composition of macroalgae is highly variable and is explained in terms of an unradiogenic 187Os/188Os contribution from rivers draining younger basaltic catchments that have undergone congruent weathering (and/or hydrothermal input) and a radiogenic 187Os/188Os contribution from two distinct sources: rivers draining older catchments that have undergone incongruent weathering of radiogenic primary basaltic minerals and North Atlantic seawater. The 187Re/188Os composition (~65 to 40,320) of macroalgae traces that of water, with higher values associated with higher salinity waters, but far exceeds the 187Re/188Os of water due to the preferential uptake of Re over Os by macroalgae in areas of high dissolved and/or bed load Re abundances. This study substantiates the utility of macroalgae as a proxy for the long‐term (months to years) average 187Os/188Os composition of seawater, which holds the potential to elucidate a range of Earth system and anthropogenic processes. Key Points: This article contains Re‐Os abundance and isotope data for macroalgae from Icelandic coastal watersIsotope data reflect changes in basaltic weathering and estuarine or coastal mixingThis article provides a novel approach to trace a range of Earth system and anthropogenic processes [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Geophysical Research. Biogeosciences is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1029/2018JG004492
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 16
        StartPage: 2791
    Subjects:
      – SubjectFull: Biogeochemical cycles
        Type: general
      – SubjectFull: Estuarine ecology
        Type: general
      – SubjectFull: Water chemistry
        Type: general
      – SubjectFull: Rhenium
        Type: general
      – SubjectFull: Osmium
        Type: general
    Titles:
      – TitleFull: Tracing the Impact of Coastal Water Geochemistry on the Re‐Os Systematics of Macroalgae: Insights From the Basaltic Terrain of Iceland.
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            NameFull: Sproson, Adam D.
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            NameFull: Selby, David
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            NameFull: Burton, Kevin W.
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              M: 09
              Text: Sep2018
              Type: published
              Y: 2018
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