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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...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group UK
2020
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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 |
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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 |
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