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Fractionation of rhenium isotopes in the Mackenzie River basin during oxidative weathering.

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Title: Fractionation of rhenium isotopes in the Mackenzie River basin during oxidative weathering.
Authors: Dellinger, Mathieu1 (AUTHOR) mathieu.dellinger@durham.ac.uk, Hilton, Robert G.1 (AUTHOR), Nowell, Geoff M.2 (AUTHOR)
Source: Earth & Planetary Science Letters. Nov2021, Vol. 573, pN.PAG-N.PAG. 1p.
Subjects: National Institute of Standards & Technology (U.S.), Watersheds, Surface of the earth, River sediments, Chemical weathering, Isotopic fractionation, Analysis of river sediments, Mass budget (Geophysics)
Geographic Terms: Canada
Abstract: • 0.3‰ of δ 187 Re variation across rivers from the Mackenzie River basin. • For each river, the δ 187 Re of the dissolved load is higher than that of the corresponding river sediment • The δ 187 Re of river water and sediments is controlled by both provenance and modern oxidative weathering processes • The average δ 187 Re of Mackenzie bedrock (∼ − 0.05 ‰) and dissolved load (∼ − 0.01 ‰) are lower than Atlantic seawater δ 187 Re. Rhenium (Re) is a trace element whose redox chemistry makes it an ideal candidate to trace a range of geochemical processes. Here, we report the first rhenium isotopic measurements (δ 187 Re) from river-borne materials to assess the influence of chemical weathering on Re isotopes at continental scale. The δ 187 Re was measured in water, suspended sediments and bedloads from the Mackenzie River and its main Arctic tributaries in Northwestern Canada. We find that the δ 187 Re (relative to NIST SRM 989) of river waters ranges from −0.05‰ to +0.07‰, which is generally higher than the corresponding river sediment (−0.25‰ to +0.01‰). We show that the range of δ 187 Re in river sediments (∼0.30‰) is controlled by a combination of source bedrock isotopic variability (provenance) and modern oxidative weathering processes. After correcting for bedrock variability, the δ 187 Re of solids appear to be positively correlated with the amount of Re depletion related to oxidative weathering. This correlation, and the offset in δ 187 Re between river water and sediment, can be explained by preferential oxidation of reactive phases with high δ 187 Re (i.e. rock organic carbon, sulfide minerals), but could also result from fractionation during oxidation or the influence of secondary weathering processes. Overall, we find that both basin-average bedrock δ 187 Re (∼−0.05‰) and dissolved δ 187 Re (∼−0.01‰) in the Mackenzie River are lower than the δ 187 Re of Atlantic seawater (+0.12‰). These observations provide impetus for future work to constrain the Re isotope mass balance of seawater, and assess the potential for secular shifts in its δ 187 Re values over time, which could provide an additional isotopic proxy to trace current and past redox processes at Earth's Surface. [ABSTRACT FROM AUTHOR]
Copyright of Earth & Planetary Science Letters is the property of Elsevier B.V. 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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  Data: Fractionation of rhenium isotopes in the Mackenzie River basin during oxidative weathering.
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  Data: <searchLink fieldCode="AR" term="%22Dellinger%2C+Mathieu%22">Dellinger, Mathieu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> mathieu.dellinger@durham.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Hilton%2C+Robert+G%2E%22">Hilton, Robert G.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nowell%2C+Geoff+M%2E%22">Nowell, Geoff M.</searchLink><relatesTo>2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Earth+%26+Planetary+Science+Letters%22">Earth & Planetary Science Letters</searchLink>. Nov2021, Vol. 573, pN.PAG-N.PAG. 1p.
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  Data: • 0.3‰ of δ 187 Re variation across rivers from the Mackenzie River basin. • For each river, the δ 187 Re of the dissolved load is higher than that of the corresponding river sediment • The δ 187 Re of river water and sediments is controlled by both provenance and modern oxidative weathering processes • The average δ 187 Re of Mackenzie bedrock (∼ − 0.05 ‰) and dissolved load (∼ − 0.01 ‰) are lower than Atlantic seawater δ 187 Re. Rhenium (Re) is a trace element whose redox chemistry makes it an ideal candidate to trace a range of geochemical processes. Here, we report the first rhenium isotopic measurements (δ 187 Re) from river-borne materials to assess the influence of chemical weathering on Re isotopes at continental scale. The δ 187 Re was measured in water, suspended sediments and bedloads from the Mackenzie River and its main Arctic tributaries in Northwestern Canada. We find that the δ 187 Re (relative to NIST SRM 989) of river waters ranges from −0.05‰ to +0.07‰, which is generally higher than the corresponding river sediment (−0.25‰ to +0.01‰). We show that the range of δ 187 Re in river sediments (∼0.30‰) is controlled by a combination of source bedrock isotopic variability (provenance) and modern oxidative weathering processes. After correcting for bedrock variability, the δ 187 Re of solids appear to be positively correlated with the amount of Re depletion related to oxidative weathering. This correlation, and the offset in δ 187 Re between river water and sediment, can be explained by preferential oxidation of reactive phases with high δ 187 Re (i.e. rock organic carbon, sulfide minerals), but could also result from fractionation during oxidation or the influence of secondary weathering processes. Overall, we find that both basin-average bedrock δ 187 Re (∼−0.05‰) and dissolved δ 187 Re (∼−0.01‰) in the Mackenzie River are lower than the δ 187 Re of Atlantic seawater (+0.12‰). These observations provide impetus for future work to constrain the Re isotope mass balance of seawater, and assess the potential for secular shifts in its δ 187 Re values over time, which could provide an additional isotopic proxy to trace current and past redox processes at Earth's Surface. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Earth & Planetary Science Letters is the property of Elsevier B.V. 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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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.epsl.2021.117131
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: National Institute of Standards & Technology (U.S.)
        Type: general
      – SubjectFull: Watersheds
        Type: general
      – SubjectFull: Surface of the earth
        Type: general
      – SubjectFull: River sediments
        Type: general
      – SubjectFull: Chemical weathering
        Type: general
      – SubjectFull: Isotopic fractionation
        Type: general
      – SubjectFull: Analysis of river sediments
        Type: general
      – SubjectFull: Mass budget (Geophysics)
        Type: general
      – SubjectFull: Canada
        Type: general
    Titles:
      – TitleFull: Fractionation of rhenium isotopes in the Mackenzie River basin during oxidative weathering.
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            NameFull: Dellinger, Mathieu
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            NameFull: Hilton, Robert G.
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            NameFull: Nowell, Geoff M.
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            – D: 01
              M: 11
              Text: Nov2021
              Type: published
              Y: 2021
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              Value: 0012821X
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              Value: 573
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            – TitleFull: Earth & Planetary Science Letters
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