Cargando…

Polymorphism of feldspars above 10 GPa

Feldspars are rock-forming minerals that make up most of the Earth’s crust. Along the mantle geotherm, feldspars are stable at pressures up to 3 GPa and may persist metastably at higher pressures under cold conditions. Previous structural studies of feldspars are limited to ~10 GPa, and have shown t...

Descripción completa

Detalles Bibliográficos
Autores principales: Pakhomova, Anna, Simonova, Dariia, Koemets, Iuliia, Koemets, Egor, Aprilis, Georgios, Bykov, Maxim, Gorelova, Liudmila, Fedotenko, Timofey, Prakapenka, Vitali, Dubrovinsky, Leonid
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7264230/
https://www.ncbi.nlm.nih.gov/pubmed/32483171
http://dx.doi.org/10.1038/s41467-020-16547-4
_version_ 1783540931957358592
author Pakhomova, Anna
Simonova, Dariia
Koemets, Iuliia
Koemets, Egor
Aprilis, Georgios
Bykov, Maxim
Gorelova, Liudmila
Fedotenko, Timofey
Prakapenka, Vitali
Dubrovinsky, Leonid
author_facet Pakhomova, Anna
Simonova, Dariia
Koemets, Iuliia
Koemets, Egor
Aprilis, Georgios
Bykov, Maxim
Gorelova, Liudmila
Fedotenko, Timofey
Prakapenka, Vitali
Dubrovinsky, Leonid
author_sort Pakhomova, Anna
collection PubMed
description Feldspars are rock-forming minerals that make up most of the Earth’s crust. Along the mantle geotherm, feldspars are stable at pressures up to 3 GPa and may persist metastably at higher pressures under cold conditions. Previous structural studies of feldspars are limited to ~10 GPa, and have shown that the dominant mechanism of pressure-induced deformation is the tilting of AlO(4) and SiO(4) tetrahedra in a tetrahedral framework. Herein, based on results of in situ single-crystal X-ray diffraction studies up to 27 GPa, we report the discovery of new high-pressure polymorphs of the feldspars anorthite (CaSi(2)Al(2)O(8)), albite (NaAlSi(3)O(8))(,) and microcline (KAlSi(3)O(8)). The phase transitions are induced by severe tetrahedral distortions, resulting in an increase in the Al and/or Si coordination number. High-pressure phases derived from feldspars could persist at depths corresponding to the Earth upper mantle and could possibly influence the dynamics and fate of cold subducting slabs.
format Online
Article
Text
id pubmed-7264230
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher Nature Publishing Group UK
record_format MEDLINE/PubMed
spelling pubmed-72642302020-06-12 Polymorphism of feldspars above 10 GPa Pakhomova, Anna Simonova, Dariia Koemets, Iuliia Koemets, Egor Aprilis, Georgios Bykov, Maxim Gorelova, Liudmila Fedotenko, Timofey Prakapenka, Vitali Dubrovinsky, Leonid Nat Commun Article Feldspars are rock-forming minerals that make up most of the Earth’s crust. Along the mantle geotherm, feldspars are stable at pressures up to 3 GPa and may persist metastably at higher pressures under cold conditions. Previous structural studies of feldspars are limited to ~10 GPa, and have shown that the dominant mechanism of pressure-induced deformation is the tilting of AlO(4) and SiO(4) tetrahedra in a tetrahedral framework. Herein, based on results of in situ single-crystal X-ray diffraction studies up to 27 GPa, we report the discovery of new high-pressure polymorphs of the feldspars anorthite (CaSi(2)Al(2)O(8)), albite (NaAlSi(3)O(8))(,) and microcline (KAlSi(3)O(8)). The phase transitions are induced by severe tetrahedral distortions, resulting in an increase in the Al and/or Si coordination number. High-pressure phases derived from feldspars could persist at depths corresponding to the Earth upper mantle and could possibly influence the dynamics and fate of cold subducting slabs. Nature Publishing Group UK 2020-06-01 /pmc/articles/PMC7264230/ /pubmed/32483171 http://dx.doi.org/10.1038/s41467-020-16547-4 Text en © The Author(s) 2020 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
Pakhomova, Anna
Simonova, Dariia
Koemets, Iuliia
Koemets, Egor
Aprilis, Georgios
Bykov, Maxim
Gorelova, Liudmila
Fedotenko, Timofey
Prakapenka, Vitali
Dubrovinsky, Leonid
Polymorphism of feldspars above 10 GPa
title Polymorphism of feldspars above 10 GPa
title_full Polymorphism of feldspars above 10 GPa
title_fullStr Polymorphism of feldspars above 10 GPa
title_full_unstemmed Polymorphism of feldspars above 10 GPa
title_short Polymorphism of feldspars above 10 GPa
title_sort polymorphism of feldspars above 10 gpa
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7264230/
https://www.ncbi.nlm.nih.gov/pubmed/32483171
http://dx.doi.org/10.1038/s41467-020-16547-4
work_keys_str_mv AT pakhomovaanna polymorphismoffeldsparsabove10gpa
AT simonovadariia polymorphismoffeldsparsabove10gpa
AT koemetsiuliia polymorphismoffeldsparsabove10gpa
AT koemetsegor polymorphismoffeldsparsabove10gpa
AT aprilisgeorgios polymorphismoffeldsparsabove10gpa
AT bykovmaxim polymorphismoffeldsparsabove10gpa
AT gorelovaliudmila polymorphismoffeldsparsabove10gpa
AT fedotenkotimofey polymorphismoffeldsparsabove10gpa
AT prakapenkavitali polymorphismoffeldsparsabove10gpa
AT dubrovinskyleonid polymorphismoffeldsparsabove10gpa