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Zinc isotope evidence for sulfate-rich fluid transfer across subduction zones
Subduction zones modulate the chemical evolution of the Earth's mantle. Water and volatile elements in the slab are released as fluids into the mantle wedge and this process is widely considered to result in the oxidation of the sub-arc mantle. However, the chemical composition and speciation o...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5171646/ https://www.ncbi.nlm.nih.gov/pubmed/27982033 http://dx.doi.org/10.1038/ncomms13794 |
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author | Pons, Marie-Laure Debret, Baptiste Bouilhol, Pierre Delacour, Adélie Williams, Helen |
author_facet | Pons, Marie-Laure Debret, Baptiste Bouilhol, Pierre Delacour, Adélie Williams, Helen |
author_sort | Pons, Marie-Laure |
collection | PubMed |
description | Subduction zones modulate the chemical evolution of the Earth's mantle. Water and volatile elements in the slab are released as fluids into the mantle wedge and this process is widely considered to result in the oxidation of the sub-arc mantle. However, the chemical composition and speciation of these fluids, which is critical for the mobility of economically important elements, remain poorly constrained. Sulfur has the potential to act both as oxidizing agent and transport medium. Here we use zinc stable isotopes (δ(66)Zn) in subducted Alpine serpentinites to decipher the chemical properties of slab-derived fluids. We show that the progressive decrease in δ(66)Zn with metamorphic grade is correlated with a decrease in sulfur content. As existing theoretical work predicts that Zn-SO(4)(2−) complexes preferentially incorporate heavy δ(66)Zn, our results provide strong evidence for the release of oxidized, sulfate-rich, slab serpentinite-derived fluids to the mantle wedge. |
format | Online Article Text |
id | pubmed-5171646 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-51716462016-12-23 Zinc isotope evidence for sulfate-rich fluid transfer across subduction zones Pons, Marie-Laure Debret, Baptiste Bouilhol, Pierre Delacour, Adélie Williams, Helen Nat Commun Article Subduction zones modulate the chemical evolution of the Earth's mantle. Water and volatile elements in the slab are released as fluids into the mantle wedge and this process is widely considered to result in the oxidation of the sub-arc mantle. However, the chemical composition and speciation of these fluids, which is critical for the mobility of economically important elements, remain poorly constrained. Sulfur has the potential to act both as oxidizing agent and transport medium. Here we use zinc stable isotopes (δ(66)Zn) in subducted Alpine serpentinites to decipher the chemical properties of slab-derived fluids. We show that the progressive decrease in δ(66)Zn with metamorphic grade is correlated with a decrease in sulfur content. As existing theoretical work predicts that Zn-SO(4)(2−) complexes preferentially incorporate heavy δ(66)Zn, our results provide strong evidence for the release of oxidized, sulfate-rich, slab serpentinite-derived fluids to the mantle wedge. Nature Publishing Group 2016-12-16 /pmc/articles/PMC5171646/ /pubmed/27982033 http://dx.doi.org/10.1038/ncomms13794 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Pons, Marie-Laure Debret, Baptiste Bouilhol, Pierre Delacour, Adélie Williams, Helen Zinc isotope evidence for sulfate-rich fluid transfer across subduction zones |
title | Zinc isotope evidence for sulfate-rich fluid transfer across subduction zones |
title_full | Zinc isotope evidence for sulfate-rich fluid transfer across subduction zones |
title_fullStr | Zinc isotope evidence for sulfate-rich fluid transfer across subduction zones |
title_full_unstemmed | Zinc isotope evidence for sulfate-rich fluid transfer across subduction zones |
title_short | Zinc isotope evidence for sulfate-rich fluid transfer across subduction zones |
title_sort | zinc isotope evidence for sulfate-rich fluid transfer across subduction zones |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5171646/ https://www.ncbi.nlm.nih.gov/pubmed/27982033 http://dx.doi.org/10.1038/ncomms13794 |
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