The lithium isotope response to the variable weathering of soils in Iceland
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 and...
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Online Access: | http://hdl.handle.net/2078.1/252222 https://doi.org/10.1016/j.gca.2021.08.020 |
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ftunivlouvain:oai:dial.uclouvain.be:boreal:252222 2024-05-12T08:05:47+00:00 The lithium isotope response to the variable weathering of soils in Iceland Pogge von Strandmann, Philip A.E. Burton, Kevin W. Opfergelt, Sophie Genson, Bianca Guicharnaud, Rannveig A. Gislason, Sigurður R. UCL - SST/ELI/ELIE - Environmental Sciences 2021 http://hdl.handle.net/2078.1/252222 https://doi.org/10.1016/j.gca.2021.08.020 eng eng Elsevier BV boreal:252222 http://hdl.handle.net/2078.1/252222 doi:10.1016/j.gca.2021.08.020 urn:ISSN:0016-7037 info:eu-repo/semantics/openAccess Geochimica et Cosmochimica Acta, Vol. 313, p. 55-73 (2021) Geochemistry and Petrology Silicate weathering Soil weathering Pore waters Degree of weathering Secondary minerals info:eu-repo/semantics/article 2021 ftunivlouvain https://doi.org/10.1016/j.gca.2021.08.020 2024-04-17T16:37:18Z 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 δ7Lipore 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. Article in Journal/Newspaper Iceland DIAL@UCLouvain (Université catholique de Louvain) Geochimica et Cosmochimica Acta 313 55 73 |
institution |
Open Polar |
collection |
DIAL@UCLouvain (Université catholique de Louvain) |
op_collection_id |
ftunivlouvain |
language |
English |
topic |
Geochemistry and Petrology Silicate weathering Soil weathering Pore waters Degree of weathering Secondary minerals |
spellingShingle |
Geochemistry and Petrology Silicate weathering Soil weathering Pore waters Degree of weathering Secondary minerals Pogge von Strandmann, Philip A.E. Burton, Kevin W. Opfergelt, Sophie Genson, Bianca Guicharnaud, Rannveig A. Gislason, Sigurður R. The lithium isotope response to the variable weathering of soils in Iceland |
topic_facet |
Geochemistry and Petrology Silicate weathering Soil weathering Pore waters Degree of weathering Secondary minerals |
description |
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 δ7Lipore 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. |
author2 |
UCL - SST/ELI/ELIE - Environmental Sciences |
format |
Article in Journal/Newspaper |
author |
Pogge von Strandmann, Philip A.E. Burton, Kevin W. Opfergelt, Sophie Genson, Bianca Guicharnaud, Rannveig A. Gislason, Sigurður R. |
author_facet |
Pogge von Strandmann, Philip A.E. Burton, Kevin W. Opfergelt, Sophie Genson, Bianca Guicharnaud, Rannveig A. Gislason, Sigurður R. |
author_sort |
Pogge von Strandmann, Philip A.E. |
title |
The lithium isotope response to the variable weathering of soils in Iceland |
title_short |
The lithium isotope response to the variable weathering of soils in Iceland |
title_full |
The lithium isotope response to the variable weathering of soils in Iceland |
title_fullStr |
The lithium isotope response to the variable weathering of soils in Iceland |
title_full_unstemmed |
The lithium isotope response to the variable weathering of soils in Iceland |
title_sort |
lithium isotope response to the variable weathering of soils in iceland |
publisher |
Elsevier BV |
publishDate |
2021 |
url |
http://hdl.handle.net/2078.1/252222 https://doi.org/10.1016/j.gca.2021.08.020 |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Geochimica et Cosmochimica Acta, Vol. 313, p. 55-73 (2021) |
op_relation |
boreal:252222 http://hdl.handle.net/2078.1/252222 doi:10.1016/j.gca.2021.08.020 urn:ISSN:0016-7037 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.gca.2021.08.020 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
313 |
container_start_page |
55 |
op_container_end_page |
73 |
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1798848150207725568 |