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A role for subducted albite in the water cycle and alkalinity of subduction fluids

Albite is one of the major constituents in the crust. We report here that albite, when subjected to hydrous cold subduction conditions, undergoes hitherto unknown breakdown into hydrated smectite, moganite, and corundum, above 2.9 GPa and 290 °C or about 90 km depth conditions, followed by subsequen...

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Autores principales: Hwang, Gil Chan, Hwang, Huijeong, Bang, Yoonah, Choi, Jinhyuk, Park, Yong, Jeon, Tae-Yeol, Chae, Boknam, Jung, Haemyeong, Lee, Yongjae
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7895919/
https://www.ncbi.nlm.nih.gov/pubmed/33608530
http://dx.doi.org/10.1038/s41467-021-21419-6
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author Hwang, Gil Chan
Hwang, Huijeong
Bang, Yoonah
Choi, Jinhyuk
Park, Yong
Jeon, Tae-Yeol
Chae, Boknam
Jung, Haemyeong
Lee, Yongjae
author_facet Hwang, Gil Chan
Hwang, Huijeong
Bang, Yoonah
Choi, Jinhyuk
Park, Yong
Jeon, Tae-Yeol
Chae, Boknam
Jung, Haemyeong
Lee, Yongjae
author_sort Hwang, Gil Chan
collection PubMed
description Albite is one of the major constituents in the crust. We report here that albite, when subjected to hydrous cold subduction conditions, undergoes hitherto unknown breakdown into hydrated smectite, moganite, and corundum, above 2.9 GPa and 290 °C or about 90 km depth conditions, followed by subsequent breakdown of smectite into jadeite above 4.3 GPa and 435 °C or near 135 km depth. Upon the hydration into smectite, the fluid volume of the system decreases by ~14 %, whereas it increases by ~8 % upon its dehydration into jadeite. Both the hydration and dehydration depths are correlated to increases in seismicity by 93 % and 104 %, respectively, along the South Mariana trench over the past 5 years. Moreover, the formation of smectite is accompanied by the release of OH(−) species, which would explain the formation of moganite and expected alkalinity of the subducting fluid. Thus, we shed new insights into the mechanism of water transport and related geochemical and geophysical activities in the contemporary global subduction system.
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spelling pubmed-78959192021-03-03 A role for subducted albite in the water cycle and alkalinity of subduction fluids Hwang, Gil Chan Hwang, Huijeong Bang, Yoonah Choi, Jinhyuk Park, Yong Jeon, Tae-Yeol Chae, Boknam Jung, Haemyeong Lee, Yongjae Nat Commun Article Albite is one of the major constituents in the crust. We report here that albite, when subjected to hydrous cold subduction conditions, undergoes hitherto unknown breakdown into hydrated smectite, moganite, and corundum, above 2.9 GPa and 290 °C or about 90 km depth conditions, followed by subsequent breakdown of smectite into jadeite above 4.3 GPa and 435 °C or near 135 km depth. Upon the hydration into smectite, the fluid volume of the system decreases by ~14 %, whereas it increases by ~8 % upon its dehydration into jadeite. Both the hydration and dehydration depths are correlated to increases in seismicity by 93 % and 104 %, respectively, along the South Mariana trench over the past 5 years. Moreover, the formation of smectite is accompanied by the release of OH(−) species, which would explain the formation of moganite and expected alkalinity of the subducting fluid. Thus, we shed new insights into the mechanism of water transport and related geochemical and geophysical activities in the contemporary global subduction system. Nature Publishing Group UK 2021-02-19 /pmc/articles/PMC7895919/ /pubmed/33608530 http://dx.doi.org/10.1038/s41467-021-21419-6 Text en © The Author(s) 2021 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/.
spellingShingle Article
Hwang, Gil Chan
Hwang, Huijeong
Bang, Yoonah
Choi, Jinhyuk
Park, Yong
Jeon, Tae-Yeol
Chae, Boknam
Jung, Haemyeong
Lee, Yongjae
A role for subducted albite in the water cycle and alkalinity of subduction fluids
title A role for subducted albite in the water cycle and alkalinity of subduction fluids
title_full A role for subducted albite in the water cycle and alkalinity of subduction fluids
title_fullStr A role for subducted albite in the water cycle and alkalinity of subduction fluids
title_full_unstemmed A role for subducted albite in the water cycle and alkalinity of subduction fluids
title_short A role for subducted albite in the water cycle and alkalinity of subduction fluids
title_sort role for subducted albite in the water cycle and alkalinity of subduction fluids
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7895919/
https://www.ncbi.nlm.nih.gov/pubmed/33608530
http://dx.doi.org/10.1038/s41467-021-21419-6
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