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The lithium isotope response to the variable weathering of soils in Iceland.

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Title: The lithium isotope response to the variable weathering of soils in Iceland.
Authors: Pogge von Strandmann, Philip A.E.1,2 (AUTHOR) ppoggevo@uni-mainz.de, Burton, Kevin W.3 (AUTHOR), Opfergelt, Sophie4 (AUTHOR), Genson, Bianca2 (AUTHOR), Guicharnaud, Rannveig A.5 (AUTHOR), Gislason, Sigurður R.6 (AUTHOR)
Source: Geochimica et Cosmochimica Acta. Nov2021, Vol. 313, p55-73. 19p.
Subjects: Lithium isotopes, Soil weathering, Pore water, Chemical weathering, Clay minerals, Lithium, Pore water pressure
Geographic Terms: Iceland
Abstract: This study has analysed Li isotopes ratios from well-studied soil and pore water profiles from Iceland that have the same parent material but have experienced different degrees of chemical weathering. Thus, from least to most weathered, we have analysed vitrosols (V), gleyic andosols (GA), brown andosols (BA), Histosols (H) and Histic Andosols (HA). Although the most weathered H and HA soils have the highest content in clay-sized material, they have the least fractionated δ7Li pore water values. In contrast, the least weathered GA and BA pore waters are most fractionated for Li isotopes. Given that Li isotope ratios are fractionated by clay mineral formation, this appears counter-intuitive. A single trend for all samples of δ7Li as a function of Li/Na ratios suggests that they are all controlled by a process with a single fractionation factor, in this case likely the formation of poorly-crystalline allophane, which dominates in the "least weathered" soils. This rapidly forming secondary mineral dominates Li isotope fractionation over more slowly-forming crystalline clays. The fractionation along a single path shows that the key process here in controlling the Li isotope ratio of surface waters is the degree of Li uptake by secondary minerals. This does not necessarily correspond to the amount of clay minerals present in the soil, but to the amount of clay minerals that are being newly formed in a single passage of the pore water through the soil, or are in equilibrium with soil solutions at the time of sampling. [ABSTRACT FROM AUTHOR]
Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science 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.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 152767613
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: The lithium isotope response to the variable weathering of soils in Iceland.
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  Data: <searchLink fieldCode="JN" term="%22Geochimica+et+Cosmochimica+Acta%22">Geochimica et Cosmochimica Acta</searchLink>. Nov2021, Vol. 313, p55-73. 19p.
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  Data: <searchLink fieldCode="DE" term="%22Lithium+isotopes%22">Lithium isotopes</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+weathering%22">Soil weathering</searchLink><br /><searchLink fieldCode="DE" term="%22Pore+water%22">Pore water</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+weathering%22">Chemical weathering</searchLink><br /><searchLink fieldCode="DE" term="%22Clay+minerals%22">Clay minerals</searchLink><br /><searchLink fieldCode="DE" term="%22Lithium%22">Lithium</searchLink><br /><searchLink fieldCode="DE" term="%22Pore+water+pressure%22">Pore water pressure</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Iceland%22">Iceland</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This study has analysed Li isotopes ratios from well-studied soil and pore water profiles from Iceland that have the same parent material but have experienced different degrees of chemical weathering. Thus, from least to most weathered, we have analysed vitrosols (V), gleyic andosols (GA), brown andosols (BA), Histosols (H) and Histic Andosols (HA). Although the most weathered H and HA soils have the highest content in clay-sized material, they have the least fractionated δ7Li pore water values. In contrast, the least weathered GA and BA pore waters are most fractionated for Li isotopes. Given that Li isotope ratios are fractionated by clay mineral formation, this appears counter-intuitive. A single trend for all samples of δ7Li as a function of Li/Na ratios suggests that they are all controlled by a process with a single fractionation factor, in this case likely the formation of poorly-crystalline allophane, which dominates in the "least weathered" soils. This rapidly forming secondary mineral dominates Li isotope fractionation over more slowly-forming crystalline clays. The fractionation along a single path shows that the key process here in controlling the Li isotope ratio of surface waters is the degree of Li uptake by secondary minerals. This does not necessarily correspond to the amount of clay minerals present in the soil, but to the amount of clay minerals that are being newly formed in a single passage of the pore water through the soil, or are in equilibrium with soil solutions at the time of sampling. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science 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.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=152767613
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.gca.2021.08.020
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 19
        StartPage: 55
    Subjects:
      – SubjectFull: Lithium isotopes
        Type: general
      – SubjectFull: Soil weathering
        Type: general
      – SubjectFull: Pore water
        Type: general
      – SubjectFull: Chemical weathering
        Type: general
      – SubjectFull: Clay minerals
        Type: general
      – SubjectFull: Lithium
        Type: general
      – SubjectFull: Pore water pressure
        Type: general
      – SubjectFull: Iceland
        Type: general
    Titles:
      – TitleFull: The lithium isotope response to the variable weathering of soils in Iceland.
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            NameFull: Pogge von Strandmann, Philip A.E.
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            NameFull: Burton, Kevin W.
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            NameFull: Opfergelt, Sophie
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            – D: 15
              M: 11
              Text: Nov2021
              Type: published
              Y: 2021
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              Value: 313
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