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High-pressure phase transition and equation of state of hydrous Al-bearing silica

  • Giacomo Criniti ORCID logo , Takayuki Ishii , Alexander Kurnosov , Konstantin Glazyrin and Tiziana Boffa Ballaran
Published/Copyright: July 27, 2023
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American Mineralogist
From the journal American Mineralogist Volume 108 Issue 8

Abstract

Stishovite, a rutile-structured polymorph of SiO2, is a main component of subducted basaltic lithologies in the lower mantle. At mid lower-mantle depths, a second-order ferroelastic transition to orthorhombic CaCl2-type (post-stishovite) structure occurs, causing extensive elastic shear softening. Previous studies showed that Al incorporation can decrease the transition pressure, while it is still debated whether H has a similar effect. Here we report the equations of state, structural evolution, and phase transformation of Si0.948Al0.052O1.983H0.018 (Al5) stishovite and Si0.886Al0.114O1.980H0.074 (Al11) post-stishovite samples using diamond-anvil cells in combination with synchrotron X-ray diffraction and Raman spectroscopy. The Al5 sample transformed to the orthorhombic polymorph upon compression to 16 GPa, displaying a drop of ~12% in its bulk modulus across the transformation. The Al11 sample did not undergo any phase transition in the pressure range investigated. Single-crystal structural refinements and Raman spectroscopy measurements on the Al5 sample show that the soft optic mode B1g is decoupled from the tetragonal-to-orthorhombic structural transformation and shows a plateau in the stability field of post-stishovite, between 20 and 30 GPa. This observation indicates that the transformation is not pseudo-proper ferroelastic as in SiO2 stishovite and that existing Landau expansions are likely not applicable to H-rich Al-bearing silica samples. Using the equation of state parameters of orthorhombic Al5 and Al11 and literature data on SiO2 post-stishovite we then discuss the possibility of non-ideal mixing along the SiO2-AlOOH join.

Keywords: Stishovite; X-ray diffraction; phase transition; equation of state; nominally anhydrous minerals

Acknowledgments and funding

We thank Raphael Njul and Detlef Krauße for their help with the sample preparation and assistance with electron microprobe analyses. We also thank two anonymous reviewers and the technical editor for their constructive comments that helped us to improve the manuscript. This study was supported by DFG grant FR1555/11. We acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for the provision of experimental facilities. Parts of this research were carried out at the Extreme Conditions Beamline P02.2, PETRA-III.

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Received: 2022-04-04
Accepted: 2022-09-17
Published Online: 2023-07-27
Published in Print: 2023-08-28

© 2023 by Mineralogical Society of America

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https://doi.org/10.2138/am-2022-8546
Keywords for this article
Stishovite; X-ray diffraction; phase transition; equation of state; nominally anhydrous minerals

Articles in the same Issue

  1. Experimental study of apatite-fluid interaction and partitioning of rare earth elements at 150 and 250 °C
  2. Assimilation of xenocrystic apatite in peraluminous granitic magmas
  3. Cathodoluminescence of iron oxides and oxyhydroxides
  4. The effect of elemental diffusion on the application of olivine-composition-based magmatic thermometry, oxybarometry, and hygrometry: A case study of olivine phenocrysts from the Jiagedaqi basalts, northeast China
  5. Characterization of nano-minerals and nanoparticles in supergene rare earth element mineralization related to chemical weathering of granites
  6. Atomic-scale interlayer friction of gibbsite is lower than brucite due to interactions of hydroxyls
  7. The spatial and temporal evolution of mineral discoveries and their impact on mineral rarity
  8. The role of parent lithology in nanoscale clay-mineral transformations in a subtropical monsoonal climate
  9. Discovery of terrestrial andreyivanovite, FeCrP, and the effect of Cr and V substitution on the low-pressure barringerite-allabogdanite transition
  10. Microstructural changes and Pb mobility during the zircon to reidite transformation: Implications for planetary impact chronology
  11. Thermal equation of state of ice-VII revisited by single-crystal X-ray diffraction
  12. Empirical electronic polarizabilities for use in refractive index measurements at 589.3 nm: Hydroxyl polarizabilities
  13. High-pressure behavior of 3.65 Å phase: Insights from Raman spectroscopy
  14. High-pressure phase transition and equation of state of hydrous Al-bearing silica
  15. Memorial of Maryellen Cameron (1943−2022)
  16. New Mineral Names
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