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Aluminous hydrous magnesium silicate as a lower-mantle hydrogen reservoir: a role as an agent for material transport

The potential for storage of a large quantity of water/hydrogen in the lower mantle has important implications for the dynamics and evolution of the Earth. A dense hydrous magnesium silicate called phase D is a potential candidate for such a hydrogen reservoir. Its MgO–SiO(2)–H(2)O form has been bel...

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Autores principales: Nakatsuka, Akihiko, Yoshiasa, Akira, Ohkawa, Makio, Ito, Eiji
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8897469/
https://www.ncbi.nlm.nih.gov/pubmed/35246544
http://dx.doi.org/10.1038/s41598-022-07007-8
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author Nakatsuka, Akihiko
Yoshiasa, Akira
Ohkawa, Makio
Ito, Eiji
author_facet Nakatsuka, Akihiko
Yoshiasa, Akira
Ohkawa, Makio
Ito, Eiji
author_sort Nakatsuka, Akihiko
collection PubMed
description The potential for storage of a large quantity of water/hydrogen in the lower mantle has important implications for the dynamics and evolution of the Earth. A dense hydrous magnesium silicate called phase D is a potential candidate for such a hydrogen reservoir. Its MgO–SiO(2)–H(2)O form has been believed to be stable at lower-mantle pressures but only in low-temperature regimes such as subducting slabs because of decomposition below mantle geotherm. Meanwhile, the presence of Al was reported to be a key to enhancing the thermal stability of phase D; however, the detailed Al-incorporation effect on its stability remains unclear. Here we report on Al-bearing phase D (Al-phase D) synthesized from a bridgmanite composition, with Al content expected in bridgmanite formed from a representative mantle composition, under over-saturation of water. We find that the incorporation of Al, despite smaller amounts, into phase D increases its hydrogen content and moreover extends its stability field not only to higher temperatures but also presumably to higher pressures. This leads to that Al-phase D can be one of the most potential reservoirs for a large quantity of hydrogen in the lower mantle. Further, Al-phase D formed by reaction between bridgmanite and water could play an important role in material transport in the lower mantle.
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spelling pubmed-88974692022-03-08 Aluminous hydrous magnesium silicate as a lower-mantle hydrogen reservoir: a role as an agent for material transport Nakatsuka, Akihiko Yoshiasa, Akira Ohkawa, Makio Ito, Eiji Sci Rep Article The potential for storage of a large quantity of water/hydrogen in the lower mantle has important implications for the dynamics and evolution of the Earth. A dense hydrous magnesium silicate called phase D is a potential candidate for such a hydrogen reservoir. Its MgO–SiO(2)–H(2)O form has been believed to be stable at lower-mantle pressures but only in low-temperature regimes such as subducting slabs because of decomposition below mantle geotherm. Meanwhile, the presence of Al was reported to be a key to enhancing the thermal stability of phase D; however, the detailed Al-incorporation effect on its stability remains unclear. Here we report on Al-bearing phase D (Al-phase D) synthesized from a bridgmanite composition, with Al content expected in bridgmanite formed from a representative mantle composition, under over-saturation of water. We find that the incorporation of Al, despite smaller amounts, into phase D increases its hydrogen content and moreover extends its stability field not only to higher temperatures but also presumably to higher pressures. This leads to that Al-phase D can be one of the most potential reservoirs for a large quantity of hydrogen in the lower mantle. Further, Al-phase D formed by reaction between bridgmanite and water could play an important role in material transport in the lower mantle. Nature Publishing Group UK 2022-03-04 /pmc/articles/PMC8897469/ /pubmed/35246544 http://dx.doi.org/10.1038/s41598-022-07007-8 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Nakatsuka, Akihiko
Yoshiasa, Akira
Ohkawa, Makio
Ito, Eiji
Aluminous hydrous magnesium silicate as a lower-mantle hydrogen reservoir: a role as an agent for material transport
title Aluminous hydrous magnesium silicate as a lower-mantle hydrogen reservoir: a role as an agent for material transport
title_full Aluminous hydrous magnesium silicate as a lower-mantle hydrogen reservoir: a role as an agent for material transport
title_fullStr Aluminous hydrous magnesium silicate as a lower-mantle hydrogen reservoir: a role as an agent for material transport
title_full_unstemmed Aluminous hydrous magnesium silicate as a lower-mantle hydrogen reservoir: a role as an agent for material transport
title_short Aluminous hydrous magnesium silicate as a lower-mantle hydrogen reservoir: a role as an agent for material transport
title_sort aluminous hydrous magnesium silicate as a lower-mantle hydrogen reservoir: a role as an agent for material transport
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8897469/
https://www.ncbi.nlm.nih.gov/pubmed/35246544
http://dx.doi.org/10.1038/s41598-022-07007-8
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