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Bridgmanite-like crystal structure in the novel Ti-rich phase synthesized at transition zone condition

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Published/Copyright: January 3, 2017
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American Mineralogist
From the journal American Mineralogist Volume 102 Issue 1

Abstract

A new Ti-bearing bridgmanite-like phase with a threefold commensurate superstructure of the ideal MgSiO3-perovskite structure was observed in a [Mg5/6Al1/6][Si1/2Ti1/3Al1/6]O3 crystal synthesized in the model system Mg3Al2Si3O12–MgTiO3 at 20 GPa and 1600 °C. The compound was found to be orthorhombic, space group Pnma, with lattice parameters a = 14.767(3), b = 6.958(1), c = 4.812(1) Å, V = 494.4(2) Å3, which represents a 3a × b × c superstructure of the typical Pnma perovskite structure. The structure was refined to R = 0.024 using 846 independent reflections. The superstructure mainly arises from the ordering of titanium in one of the octahedral positions. Crystal-chemical details of the different polyhedra in the superstructure are discussed in comparison to pure MgSiO3. This is the first documented superstructure of a bridgmanite phase, and Ti-rich bridgmanite in the lower mantle arising from local Tienrichments may exhibit different physical properties and elemental partitioning behavior from Ti-poor, peridotitic bridgmanite. The study also shows that large amounts of Ti can stabilize bridgmanite-like compounds at considerably lower pressure than lower mantle conditions.

Keywords: Bridgmanite; titanium; lower mantle; crystal structure; microprobe analysis; synthesis

Acknowledgments

Thanks are due to Fabrizio Nestola, Ian Swainson, and three anonymous referees for their insightful comments. The research was supported by “progetto di Ateneo 2014, University of Firenze” to L.B., by CNR, Istituto di Geoscienze e Georisorse sezione di Firenze, Italy, and by the Russian Foundation for Basic Research (project nos. 16-05-00419 and 15-05-50033) to E.S. and A.B. E.S. thanks Geodynamics Research Center, Ehime University, Matsuyama, Japan, for support of her visit in 2016.

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Received: 2016-8-19
Accepted: 2016-11-13
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-2017-5937
Keywords for this article
Bridgmanite; titanium; lower mantle; crystal structure; microprobe analysis; synthesis

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  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
  8. Solved: The enigma of labradorite feldspar with incommensurately modulated structure
  9. Special Collection: Earth Analogs for Martian Geological Materials and Processes
  10. Formation of the ferruginous smectite SWa-1 by alteration of soil clays
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  12. Dissolving dolomite in a stable UHP mineral assemblage: Evidence from Cal-Dol marbles of the Dora-Maira Massif (Italian Western Alps)
  13. Special collection: Apatite: a common mineral, uncommonly versatile
  14. Hydroxyl, Cl, and F partitioning between high-silica rhyolitic melts-apatite-fluid(s) at 50–200 MPa and 700–1000 °C
  15. Special collection: Apatite: a common mineral, uncommonly versatile
  16. Apatite trace element and isotope applications to petrogenesis and provenance
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  36. XAFS spectroscopic study of Ti coordination in garnet
  38. Effect of composition on compressibility of skiagite-Fe-majorite garnet
  40. An integrated EPMA-EBSD study of metamorphic histories recorded in garnet
  42. A new formula and crystal structure for nickelskutterudite, (Ni,Co,Fe)As3, and occupancy of the icosahedral cation site in the skutterudite group
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