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Decoupling of inorganic and organic carbon during slab mantle devolatilisation

Serpentinites are an important sink for both inorganic and organic carbon, and their behavior during subduction is thought to play a fundamental role in the global cycling of carbon. Here we show that fluid-derived veins are preserved within the Zermatt-Saas ultra-high pressure serpentinites providi...

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Autores principales: Bouilhol, P., Debret, B., Inglis, E. C., Warembourg, M., Grocolas, T., Rigaudier, T., Villeneuve, J., Burton, K. W.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8760304/
https://www.ncbi.nlm.nih.gov/pubmed/35031609
http://dx.doi.org/10.1038/s41467-022-27970-0
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author Bouilhol, P.
Debret, B.
Inglis, E. C.
Warembourg, M.
Grocolas, T.
Rigaudier, T.
Villeneuve, J.
Burton, K. W.
author_facet Bouilhol, P.
Debret, B.
Inglis, E. C.
Warembourg, M.
Grocolas, T.
Rigaudier, T.
Villeneuve, J.
Burton, K. W.
author_sort Bouilhol, P.
collection PubMed
description Serpentinites are an important sink for both inorganic and organic carbon, and their behavior during subduction is thought to play a fundamental role in the global cycling of carbon. Here we show that fluid-derived veins are preserved within the Zermatt-Saas ultra-high pressure serpentinites providing key evidence for carbonate mobility during serpentinite devolatilisation. We show through the O, C, and Sr isotope analyses of vein minerals and the host serpentinites that about 90% of the meta-serpentinite inorganic carbon is remobilized during slab devolatilisation. In contrast, graphite-like carbonaceous compounds remain trapped within the host rock as inclusions within metamorphic olivine while the bulk elemental and isotope composition of organic carbon remains relatively unchanged during the subduction process. This shows a decoupling behavior of carbon during serpentinite dehydration in subduction zones. This process will therefore facilitate the transfer of inorganic carbon to the mantle wedge and the preferential slab sequestration of organic carbon en route to the deep mantle.
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spelling pubmed-87603042022-01-26 Decoupling of inorganic and organic carbon during slab mantle devolatilisation Bouilhol, P. Debret, B. Inglis, E. C. Warembourg, M. Grocolas, T. Rigaudier, T. Villeneuve, J. Burton, K. W. Nat Commun Article Serpentinites are an important sink for both inorganic and organic carbon, and their behavior during subduction is thought to play a fundamental role in the global cycling of carbon. Here we show that fluid-derived veins are preserved within the Zermatt-Saas ultra-high pressure serpentinites providing key evidence for carbonate mobility during serpentinite devolatilisation. We show through the O, C, and Sr isotope analyses of vein minerals and the host serpentinites that about 90% of the meta-serpentinite inorganic carbon is remobilized during slab devolatilisation. In contrast, graphite-like carbonaceous compounds remain trapped within the host rock as inclusions within metamorphic olivine while the bulk elemental and isotope composition of organic carbon remains relatively unchanged during the subduction process. This shows a decoupling behavior of carbon during serpentinite dehydration in subduction zones. This process will therefore facilitate the transfer of inorganic carbon to the mantle wedge and the preferential slab sequestration of organic carbon en route to the deep mantle. Nature Publishing Group UK 2022-01-14 /pmc/articles/PMC8760304/ /pubmed/35031609 http://dx.doi.org/10.1038/s41467-022-27970-0 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Bouilhol, P.
Debret, B.
Inglis, E. C.
Warembourg, M.
Grocolas, T.
Rigaudier, T.
Villeneuve, J.
Burton, K. W.
Decoupling of inorganic and organic carbon during slab mantle devolatilisation
title Decoupling of inorganic and organic carbon during slab mantle devolatilisation
title_full Decoupling of inorganic and organic carbon during slab mantle devolatilisation
title_fullStr Decoupling of inorganic and organic carbon during slab mantle devolatilisation
title_full_unstemmed Decoupling of inorganic and organic carbon during slab mantle devolatilisation
title_short Decoupling of inorganic and organic carbon during slab mantle devolatilisation
title_sort decoupling of inorganic and organic carbon during slab mantle devolatilisation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8760304/
https://www.ncbi.nlm.nih.gov/pubmed/35031609
http://dx.doi.org/10.1038/s41467-022-27970-0
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