Startseite Effect of composition on compressibility of skiagite-Fe-majorite garnet
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Effect of composition on compressibility of skiagite-Fe-majorite garnet

  • Leyla Ismailova EMAIL logo , Maxim Bykov , Elena Bykova , Andrey Bobrov , Ilya Kupenko , Valerio Cerantola , Denis Vasiukov , Natalia Dubrovinskaia , Catherine McCammon , Michael Hanfland , Konstantin Glazyrin , Hanns-Peter Liermann , Alexander Chumakov und Leonid Dubrovinsky
Veröffentlicht/Copyright: 3. Januar 2017
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 102 Heft 1

Abstract

Skiagite-Fe-majorite garnets were synthesized using a multianvil apparatus at 7.5–9.5 GPa and 1400–1600 K. Single-crystal X-ray diffraction at ambient conditions revealed that synthesized garnets contain 23 to 76% of an Fe-majorite component. We found that the substitution of Fe2+ and Si4+ for Fe3+ in the octahedral site decreases the unit-cell volume of garnet at ambient conditions. Analysis of single-crystal X-ray diffraction data collected on compression up to 90 GPa of garnets with different compositions reveals that with increasing majorite component the bulk modulus increases from 159(1) to 172(1) GPa. Our results and literature data unambiguously demonstrate that the total iron content and the Fe3+/Fe2+ ratio in (Mg, Fe)-majorites have a large influence on their elasticity. At pressures between 50 and 60 GPa we observed a significant deviation from a monotonic dependence of the molar volumes of skiagite-Fe-majorite garnet with pressure, and over a small pressure interval the volume dropped by about 3%. By combining results from single-crystal X-ray diffraction and high-pressure synchrotron Mössbauer source spectroscopy we demonstrate that these changes in the compressional behavior are associated with changes of the electronic state of Fe in the octahedral site.

Keywords: Skiagite-majorite garnet; single-crystal X-ray diffraction; Mössbauer spectroscopy; equation of state; upper mantle; transition zone

Acknowledgments

We acknowledge the ESRF and DESY for provision of synchrotron radiation facilities. This study was partly supported by the Russian Foundation for Basic Research (project no. 16-05-00419).

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Received: 2016-5-16
Accepted: 2016-8-29
Published Online: 2017-1-3
Published in Print: 2017-1-1

© 2017 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2017-5856
Schlagwörter für diesen Artikel
Skiagite-majorite garnet; single-crystal X-ray diffraction; Mössbauer spectroscopy; equation of state; upper mantle; transition zone

Artikel in diesem Heft

  1. Highlights and Breakthroughs
  2. Periodic activity in continental magmatic arcs
  3. Highlights and Breakthroughs
  4. Early warning signs for mining accidents: Detecting crackling noise
  5. Review
  6. Fluids and trace element transport in subduction zones
  7. Solved: The enigma of labradorite feldspar with incommensurately modulated structure
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  13. Special collection: Apatite: a common mineral, uncommonly versatile
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  15. Special collection: Apatite: a common mineral, uncommonly versatile
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