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Influence of atmospheric deposits and secondary minerals on Li isotopes budget in a highly weathered catchment, Guadeloupe (Lesser Antilles).

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Title: Influence of atmospheric deposits and secondary minerals on Li isotopes budget in a highly weathered catchment, Guadeloupe (Lesser Antilles).
Authors: Clergue, C.1, Dellinger, M.1, Buss, H.L.2, Gaillardet, J.1, Benedetti, M.F.1, Dessert, C.1 dessert@ipgp.fr
Source: Chemical Geology. Oct2015, Vol. 414, p28-41. 14p.
Subjects: Atmospheric deposition, Minerals, Lithium isotopes, Watersheds, Dust
Geographic Terms: Guadeloupe
Abstract: To better constrain Li dynamics in the tropics, we sampled critical zone compartments of a small forested andesitic catchment in Guadeloupe (soils, parent rock, atmospheric dust, plants, soil solutions, stream and rain waters). The aims of this study are to identify the origin of Li in the different compartments and to better characterize the behavior of Li and its isotopes during water–rock interaction in a highly cation-depleted soil. The Li isotope signature (δ 7 Li) of throughfall samples varies between + 11.2‰ and + 26.4‰. As this is lower than the seawater signature (31‰) and vegetation does not fractionate Li isotopes, our data indicate that Saharan dust (− 0.7‰) significantly contributes to the throughfall signature. Li isotope composition measured in a 12.5 m deep soil profile varies from + 3.9‰ near the surface to − 13.5‰ at 11 m depth. Compared to unweathered andesite (+ 5‰), the deep soil signature is in agreement with preferential incorporation of light Li into secondary minerals. In the top soil however, our results also emphasized that atmospheric deposition (wet and dry) is a main source of Li to the soil. The decreasing δ 7 Li with increasing depth is consistent with a vertical gradient of incorporation of heavy atmospheric Li, this input being maximal near the surface. At the catchment scale, throughfall and total atmospheric inputs (sea salts + Saharan dust) provide 12.1 and 23.9 g Li yr − 1 respectively to the Quiock Creek catchment. These fluxes represent 34% and 67%, respectively, of Li exported at the outlet indicating that atmospheric deposition is one of the main Li inputs to the critical zone. Li concentration and isotopic mass balance at the catchment scale indicate that in addition to atmospheric deposition, secondary mineral phase dissolution is a major solute source and that andesite no longer participates in significant production of Li. [ABSTRACT FROM AUTHOR]
Copyright of Chemical Geology 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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DbLabel: Engineering Source
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  Data: Influence of atmospheric deposits and secondary minerals on Li isotopes budget in a highly weathered catchment, Guadeloupe (Lesser Antilles).
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  Data: <searchLink fieldCode="AR" term="%22Clergue%2C+C%2E%22">Clergue, C.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Dellinger%2C+M%2E%22">Dellinger, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Buss%2C+H%2EL%2E%22">Buss, H.L.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Gaillardet%2C+J%2E%22">Gaillardet, J.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Benedetti%2C+M%2EF%2E%22">Benedetti, M.F.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Dessert%2C+C%2E%22">Dessert, C.</searchLink><relatesTo>1</relatesTo><i> dessert@ipgp.fr</i>
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  Data: <searchLink fieldCode="JN" term="%22Chemical+Geology%22">Chemical Geology</searchLink>. Oct2015, Vol. 414, p28-41. 14p.
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  Data: To better constrain Li dynamics in the tropics, we sampled critical zone compartments of a small forested andesitic catchment in Guadeloupe (soils, parent rock, atmospheric dust, plants, soil solutions, stream and rain waters). The aims of this study are to identify the origin of Li in the different compartments and to better characterize the behavior of Li and its isotopes during water–rock interaction in a highly cation-depleted soil. The Li isotope signature (δ 7 Li) of throughfall samples varies between + 11.2‰ and + 26.4‰. As this is lower than the seawater signature (31‰) and vegetation does not fractionate Li isotopes, our data indicate that Saharan dust (− 0.7‰) significantly contributes to the throughfall signature. Li isotope composition measured in a 12.5 m deep soil profile varies from + 3.9‰ near the surface to − 13.5‰ at 11 m depth. Compared to unweathered andesite (+ 5‰), the deep soil signature is in agreement with preferential incorporation of light Li into secondary minerals. In the top soil however, our results also emphasized that atmospheric deposition (wet and dry) is a main source of Li to the soil. The decreasing δ 7 Li with increasing depth is consistent with a vertical gradient of incorporation of heavy atmospheric Li, this input being maximal near the surface. At the catchment scale, throughfall and total atmospheric inputs (sea salts + Saharan dust) provide 12.1 and 23.9 g Li yr − 1 respectively to the Quiock Creek catchment. These fluxes represent 34% and 67%, respectively, of Li exported at the outlet indicating that atmospheric deposition is one of the main Li inputs to the critical zone. Li concentration and isotopic mass balance at the catchment scale indicate that in addition to atmospheric deposition, secondary mineral phase dissolution is a major solute source and that andesite no longer participates in significant production of Li. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Chemical Geology 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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        Value: 10.1016/j.chemgeo.2015.08.015
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      – Code: eng
        Text: English
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        PageCount: 14
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      – SubjectFull: Atmospheric deposition
        Type: general
      – SubjectFull: Minerals
        Type: general
      – SubjectFull: Lithium isotopes
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      – SubjectFull: Watersheds
        Type: general
      – SubjectFull: Dust
        Type: general
      – SubjectFull: Guadeloupe
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      – TitleFull: Influence of atmospheric deposits and secondary minerals on Li isotopes budget in a highly weathered catchment, Guadeloupe (Lesser Antilles).
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              Text: Oct2015
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