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

doi:10.1038/s41467-020-16547-4

Title: Polymorphism of feldspars above 10 GPa

Abstract

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 AlO₄ and SiO₄ 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 (CaSi₂Al₂O₈), albite (NaAlSi₃O₈)_, and microcline (KAlSi₃O₈). 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.

Authors:

^[1]; Simonova, Dariia ^[2]; Koemets, Iuliia ^[2]; Koemets, Egor ^[2];

^[2];

^[3]; Fedotenko, Timofey ^[2];

^[4];

^[2]

Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Univ. Bayreuth (Germany)
Saint-Petersburg State Univ. (Russia)
Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS)

Publication Date:: 2020-06-01

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Org.:: German Research Foundation (DFG); Russian Science Foundation; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division

OSTI Identifier:: 1631852

Grant/Contract Number:: DU 393/9-2; DU 393/13-1; 19-77-00038; FG02-94ER14466; AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: Nature Communications

Additional Journal Information:: Journal Volume: 11; Journal Issue: 1; Journal ID: ISSN 2041-1723

Publisher:: Nature Publishing Group

Country of Publication:: United States

Language:: ENGLISH

Subject:: 58 GEOSCIENCES; Mineralogy; Petrology; Tectonics

Citation Formats


                    Pakhomova, Anna, Simonova, Dariia, Koemets, Iuliia, Koemets, Egor, Aprilis, Georgios, Bykov, Maxim, Gorelova, Liudmila, Fedotenko, Timofey, Prakapenka, Vitali, and Dubrovinsky, Leonid. Polymorphism of feldspars above 10 GPa.  United States: N. p., 2020. 
Web.  doi:10.1038/s41467-020-16547-4.

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                    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.  United States.  https://doi.org/10.1038/s41467-020-16547-4

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                    Pakhomova, Anna, Simonova, Dariia, Koemets, Iuliia, Koemets, Egor, Aprilis, Georgios, Bykov, Maxim, Gorelova, Liudmila, Fedotenko, Timofey, Prakapenka, Vitali, and Dubrovinsky, Leonid. Mon .  
"Polymorphism of feldspars above 10 GPa".  United States.  https://doi.org/10.1038/s41467-020-16547-4.  https://www.osti.gov/servlets/purl/1631852.

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@article{osti_1631852,

  title        = {Polymorphism of feldspars above 10 GPa},

  author       = {Pakhomova, Anna and Simonova, Dariia and Koemets, Iuliia and Koemets, Egor and Aprilis, Georgios and Bykov, Maxim and Gorelova, Liudmila and Fedotenko, Timofey and Prakapenka, Vitali and Dubrovinsky, Leonid},

  abstractNote = {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 AlO4 and SiO4 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 (CaSi2Al2O8), albite (NaAlSi3O8), and microcline (KAlSi3O8). 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.},

  doi          = {10.1038/s41467-020-16547-4},

  journal      = {Nature Communications},

  number       = 1,

  volume       = 11,

  place        = {United States},

  year         = {2020},

  month        = {6}

}

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Fig. 1: Feldspar crystal structure under ambient conditions. All Si and Al atoms are bonded to four oxygen atoms to form tetrahedra. SiO₄ and AlO₄ tetrahedra (given in grey) form a three-dimensional framework by sharing common vertices. Al atoms occupy half of the tetrahedral sites in anorthite (CaSi₂Al₂O₈) and amore »

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