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Ductile deformation during carbonation of serpentinized peridotite
Carbonated serpentinites (listvenites) in the Samail Ophiolite, Oman, record mineralization of 1–2 Gt of CO(2), but the mechanisms providing permeability for continued reactive fluid flow are unclear. Based on samples of the Oman Drilling Project, here we show that listvenites with a penetrative fol...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group UK
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9203755/ https://www.ncbi.nlm.nih.gov/pubmed/35710547 http://dx.doi.org/10.1038/s41467-022-31049-1 |
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author | Menzel, Manuel D. Urai, Janos L. Ukar, Estibalitz Hirth, Greg Schwedt, Alexander Kovács, András Kibkalo, Lidia Kelemen, Peter B. |
author_facet | Menzel, Manuel D. Urai, Janos L. Ukar, Estibalitz Hirth, Greg Schwedt, Alexander Kovács, András Kibkalo, Lidia Kelemen, Peter B. |
author_sort | Menzel, Manuel D. |
collection | PubMed |
description | Carbonated serpentinites (listvenites) in the Samail Ophiolite, Oman, record mineralization of 1–2 Gt of CO(2), but the mechanisms providing permeability for continued reactive fluid flow are unclear. Based on samples of the Oman Drilling Project, here we show that listvenites with a penetrative foliation have abundant microstructures indicating that the carbonation reaction occurred during deformation. Folded magnesite veins mark the onset of carbonation, followed by deformation during carbonate growth. Undeformed magnesite and quartz overgrowths indicate that deformation stopped before the reaction was completed. We propose deformation by dilatant granular flow and dissolution-precipitation assisted the reaction, while deformation in turn was localized in the weak reacting mass. Lithostatic pore pressures promoted this process, creating dilatant porosity for CO(2) transport and solid volume increase. This feedback mechanism may be common in serpentinite-bearing fault zones and the mantle wedge overlying subduction zones, allowing massive carbonation of mantle rocks. |
format | Online Article Text |
id | pubmed-9203755 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-92037552022-06-18 Ductile deformation during carbonation of serpentinized peridotite Menzel, Manuel D. Urai, Janos L. Ukar, Estibalitz Hirth, Greg Schwedt, Alexander Kovács, András Kibkalo, Lidia Kelemen, Peter B. Nat Commun Article Carbonated serpentinites (listvenites) in the Samail Ophiolite, Oman, record mineralization of 1–2 Gt of CO(2), but the mechanisms providing permeability for continued reactive fluid flow are unclear. Based on samples of the Oman Drilling Project, here we show that listvenites with a penetrative foliation have abundant microstructures indicating that the carbonation reaction occurred during deformation. Folded magnesite veins mark the onset of carbonation, followed by deformation during carbonate growth. Undeformed magnesite and quartz overgrowths indicate that deformation stopped before the reaction was completed. We propose deformation by dilatant granular flow and dissolution-precipitation assisted the reaction, while deformation in turn was localized in the weak reacting mass. Lithostatic pore pressures promoted this process, creating dilatant porosity for CO(2) transport and solid volume increase. This feedback mechanism may be common in serpentinite-bearing fault zones and the mantle wedge overlying subduction zones, allowing massive carbonation of mantle rocks. Nature Publishing Group UK 2022-06-16 /pmc/articles/PMC9203755/ /pubmed/35710547 http://dx.doi.org/10.1038/s41467-022-31049-1 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 Menzel, Manuel D. Urai, Janos L. Ukar, Estibalitz Hirth, Greg Schwedt, Alexander Kovács, András Kibkalo, Lidia Kelemen, Peter B. Ductile deformation during carbonation of serpentinized peridotite |
title | Ductile deformation during carbonation of serpentinized peridotite |
title_full | Ductile deformation during carbonation of serpentinized peridotite |
title_fullStr | Ductile deformation during carbonation of serpentinized peridotite |
title_full_unstemmed | Ductile deformation during carbonation of serpentinized peridotite |
title_short | Ductile deformation during carbonation of serpentinized peridotite |
title_sort | ductile deformation during carbonation of serpentinized peridotite |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9203755/ https://www.ncbi.nlm.nih.gov/pubmed/35710547 http://dx.doi.org/10.1038/s41467-022-31049-1 |
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