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Polymorphism of feldspars above 10 GPa

Author

Listed:
  • Anna Pakhomova

    (Deutsches Elektronen-Synchrotron (DESY))

  • Dariia Simonova

    (Bayerisches Geoinstitut, Universität Bayreuth)

  • Iuliia Koemets

    (Bayerisches Geoinstitut, Universität Bayreuth)

  • Egor Koemets

    (Bayerisches Geoinstitut, Universität Bayreuth)

  • Georgios Aprilis

    (Universität Bayreuth)

  • Maxim Bykov

    (Bayerisches Geoinstitut, Universität Bayreuth)

  • Liudmila Gorelova

    (Saint-Petersburg State University)

  • Timofey Fedotenko

    (Universität Bayreuth)

  • Vitali Prakapenka

    (University of Chicago)

  • Leonid Dubrovinsky

    (Bayerisches Geoinstitut, Universität Bayreuth)

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.

Suggested Citation

  • Anna Pakhomova & Dariia Simonova & Iuliia Koemets & Egor Koemets & Georgios Aprilis & Maxim Bykov & Liudmila Gorelova & Timofey Fedotenko & Vitali Prakapenka & Leonid Dubrovinsky, 2020. "Polymorphism of feldspars above 10 GPa," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-16547-4
    DOI: 10.1038/s41467-020-16547-4
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