Lithium isotopes in waters of the tropical volcanic island of Guadeloupe: A proxy of high and low-temperature water-rock interactions.
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| Title: | Lithium isotopes in waters of the tropical volcanic island of Guadeloupe: A proxy of high and low-temperature water-rock interactions. |
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| Authors: | Dessert, Céline1 (AUTHOR) dessert@ipgp.fr, Dellinger, Mathieu2 (AUTHOR), Clergue, Clémentine1 (AUTHOR), Gaillardet, Jérôme1 (AUTHOR), Benedetti, Marc F.1 (AUTHOR) |
| Source: | Geochimica et Cosmochimica Acta. Mar2026, Vol. 417, p241-255. 15p. |
| Subjects: | Lithium isotopes, Water-rock interaction, Stream chemistry, Geochemistry, Andesite, Analytical geochemistry, Chemical weathering, Hydrothermal alteration |
| Geographic Terms: | Guadeloupe |
| Abstract: | This study examines the lithium isotope (δ7Li) geochemistry of waters flowing through andesitic rocks in order to better constrain the dissolved lithium dynamic in a tropical volcanic island context. We report the first measurements of δ7Li for eleven of the main rivers in Guadeloupe and four thermal springs on the slopes of La Soufrière volcano. These results have important implications for characterizing the mean riverine flux of lithium coming from the weathering of continental volcanic rocks, understanding the global oceanic budget of lithium, and finally, for interpreting the δ7Li of past seawater. We have measured a large range of δ7Li values (3.0–31.6‰) that we explained by different water–rock interaction processes at the scale of this small island. The rivers affected by hydrothermal inputs are the most concentrated and isotopically lighter (δ7Li from 3.0–12.3‰). This is partly attributed to the leaching and dissolution of clay-rich, hydrothermally-altered rocks which are presumed to have low δ7Li value and to the discharge from the hot-springs on La Soufrière volcano. The rivers not impacted by hydrothermal inputs are more diluted and isotopically heavier (δ7Li from 16.0–31.6‰), highlighting two distinct weathering processes in the regolith: the precipitation and dissolution of secondary minerals. In the youngest part of the island, the rivers are characterized by high δ7Li values, emphasizing that dissolved lithium is mainly controlled by the dissolution of primary andesitic minerals and the incorporation of 6Li into secondary minerals. In the oldest part of the island, the rivers have lower δ7Li values, which are partly attributed to a low δ7Li source from the dissolution of secondary minerals in the regolith. We also show a positive correlation between δ7Li in river waters and the chemical weathering rates (CWR), related to the weatherable primary minerals content in watersheds. We note that this content is linked to rock age, precipitation, regolith type/thickness and geomorphologic parameters such as elevation and slope. [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 |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 192228682 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Lithium isotopes in waters of the tropical volcanic island of Guadeloupe: A proxy of high and low-temperature water-rock interactions. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Dessert%2C+Céline%22">Dessert, Céline</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> dessert@ipgp.fr</i><br /><searchLink fieldCode="AR" term="%22Dellinger%2C+Mathieu%22">Dellinger, Mathieu</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Clergue%2C+Clémentine%22">Clergue, Clémentine</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gaillardet%2C+Jérôme%22">Gaillardet, Jérôme</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Benedetti%2C+Marc+F%2E%22">Benedetti, Marc F.</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Geochimica+et+Cosmochimica+Acta%22">Geochimica et Cosmochimica Acta</searchLink>. Mar2026, Vol. 417, p241-255. 15p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Lithium+isotopes%22">Lithium isotopes</searchLink><br /><searchLink fieldCode="DE" term="%22Water-rock+interaction%22">Water-rock interaction</searchLink><br /><searchLink fieldCode="DE" term="%22Stream+chemistry%22">Stream chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Geochemistry%22">Geochemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Andesite%22">Andesite</searchLink><br /><searchLink fieldCode="DE" term="%22Analytical+geochemistry%22">Analytical geochemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+weathering%22">Chemical weathering</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrothermal+alteration%22">Hydrothermal alteration</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Guadeloupe%22">Guadeloupe</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: This study examines the lithium isotope (δ7Li) geochemistry of waters flowing through andesitic rocks in order to better constrain the dissolved lithium dynamic in a tropical volcanic island context. We report the first measurements of δ7Li for eleven of the main rivers in Guadeloupe and four thermal springs on the slopes of La Soufrière volcano. These results have important implications for characterizing the mean riverine flux of lithium coming from the weathering of continental volcanic rocks, understanding the global oceanic budget of lithium, and finally, for interpreting the δ7Li of past seawater. We have measured a large range of δ7Li values (3.0–31.6‰) that we explained by different water–rock interaction processes at the scale of this small island. The rivers affected by hydrothermal inputs are the most concentrated and isotopically lighter (δ7Li from 3.0–12.3‰). This is partly attributed to the leaching and dissolution of clay-rich, hydrothermally-altered rocks which are presumed to have low δ7Li value and to the discharge from the hot-springs on La Soufrière volcano. The rivers not impacted by hydrothermal inputs are more diluted and isotopically heavier (δ7Li from 16.0–31.6‰), highlighting two distinct weathering processes in the regolith: the precipitation and dissolution of secondary minerals. In the youngest part of the island, the rivers are characterized by high δ7Li values, emphasizing that dissolved lithium is mainly controlled by the dissolution of primary andesitic minerals and the incorporation of 6Li into secondary minerals. In the oldest part of the island, the rivers have lower δ7Li values, which are partly attributed to a low δ7Li source from the dissolution of secondary minerals in the regolith. We also show a positive correlation between δ7Li in river waters and the chemical weathering rates (CWR), related to the weatherable primary minerals content in watersheds. We note that this content is linked to rock age, precipitation, regolith type/thickness and geomorphologic parameters such as elevation and slope. [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.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.gca.2026.01.047 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 15 StartPage: 241 Subjects: – SubjectFull: Lithium isotopes Type: general – SubjectFull: Water-rock interaction Type: general – SubjectFull: Stream chemistry Type: general – SubjectFull: Geochemistry Type: general – SubjectFull: Andesite Type: general – SubjectFull: Analytical geochemistry Type: general – SubjectFull: Chemical weathering Type: general – SubjectFull: Hydrothermal alteration Type: general – SubjectFull: Guadeloupe Type: general Titles: – TitleFull: Lithium isotopes in waters of the tropical volcanic island of Guadeloupe: A proxy of high and low-temperature water-rock interactions. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Dessert, Céline – PersonEntity: Name: NameFull: Dellinger, Mathieu – PersonEntity: Name: NameFull: Clergue, Clémentine – PersonEntity: Name: NameFull: Gaillardet, Jérôme – PersonEntity: Name: NameFull: Benedetti, Marc F. IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 03 Text: Mar2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 00167037 Numbering: – Type: volume Value: 417 Titles: – TitleFull: Geochimica et Cosmochimica Acta Type: main |
| ResultId | 1 |
