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The role of water in Earth's mantle

Geophysical observations suggest that the transition zone is wet locally. Continental and oceanic sediment components together with the basaltic and peridotitic components might be transported and accumulated in the transition zone. Low-velocity anomalies at the upper mantle–transition zone boundary...

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Autor principal: Ohtani, Eiji
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Oxford University Press 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8288861/
https://www.ncbi.nlm.nih.gov/pubmed/34692034
http://dx.doi.org/10.1093/nsr/nwz071
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author Ohtani, Eiji
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description Geophysical observations suggest that the transition zone is wet locally. Continental and oceanic sediment components together with the basaltic and peridotitic components might be transported and accumulated in the transition zone. Low-velocity anomalies at the upper mantle–transition zone boundary might be caused by the existence of dense hydrous magmas. Water can be carried farther into the lower mantle by the slabs. The anomalous Q and shear wave regions locating at the uppermost part of the lower mantle could be caused by the existence of fluid or wet magmas in this region because of the water-solubility contrast between the minerals in the transition zone and those in the lower mantle. δ-H solid solution AlO(2)H–MgSiO(4)H(2) carries water into the lower mantle. Hydrogen-bond symmetrization exists in high-pressure hydrous phases and thus they are stable at the high pressures of the lower mantle. Thus, the δ-H solid solution in subducting slabs carries water farther into the bottom of the lower mantle. Pyrite FeO(2)H(x) is formed due to a reaction between the core and hydrated slabs. This phase could be a candidate for the anomalous regions at the core–mantle boundary.
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spelling pubmed-82888612021-10-21 The role of water in Earth's mantle Ohtani, Eiji Natl Sci Rev Review Geophysical observations suggest that the transition zone is wet locally. Continental and oceanic sediment components together with the basaltic and peridotitic components might be transported and accumulated in the transition zone. Low-velocity anomalies at the upper mantle–transition zone boundary might be caused by the existence of dense hydrous magmas. Water can be carried farther into the lower mantle by the slabs. The anomalous Q and shear wave regions locating at the uppermost part of the lower mantle could be caused by the existence of fluid or wet magmas in this region because of the water-solubility contrast between the minerals in the transition zone and those in the lower mantle. δ-H solid solution AlO(2)H–MgSiO(4)H(2) carries water into the lower mantle. Hydrogen-bond symmetrization exists in high-pressure hydrous phases and thus they are stable at the high pressures of the lower mantle. Thus, the δ-H solid solution in subducting slabs carries water farther into the bottom of the lower mantle. Pyrite FeO(2)H(x) is formed due to a reaction between the core and hydrated slabs. This phase could be a candidate for the anomalous regions at the core–mantle boundary. Oxford University Press 2020-01 2019-06-11 /pmc/articles/PMC8288861/ /pubmed/34692034 http://dx.doi.org/10.1093/nsr/nwz071 Text en © The Author(s) 2019. Published by Oxford University Press on behalf of China Science Publishing & Media Ltd. https://creativecommons.org/licenses/by/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) ), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Review
Ohtani, Eiji
The role of water in Earth's mantle
title The role of water in Earth's mantle
title_full The role of water in Earth's mantle
title_fullStr The role of water in Earth's mantle
title_full_unstemmed The role of water in Earth's mantle
title_short The role of water in Earth's mantle
title_sort role of water in earth's mantle
topic Review
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8288861/
https://www.ncbi.nlm.nih.gov/pubmed/34692034
http://dx.doi.org/10.1093/nsr/nwz071
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