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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2017: 2.645

CiteScore 2017: 2.31

SCImago Journal Rank (SJR) 2017: 1.440
Source Normalized Impact per Paper (SNIP) 2017: 1.059

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1945-3027
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Volume 102, Issue 1

Issues

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

Luca Bindi
  • Corresponding author
  • Dipartimento di Scienze della Terra, Università di Firenze, Via La Pira 4, I-50121 Firenze, Italy
  • CNR–Istituto di Geoscienze e Georisorse, sezione di Firenze, Via La Pira 4, I-50121 Firenze, Italy
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Ekaterina Sirotkina
  • Geological Faculty, Moscow State University, Leninskie Gory, 119234, Moscow, Russia
  • Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academy of Sciences, 119991Moscow, Russia
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Andrey V. Bobrov
  • Geological Faculty, Moscow State University, Leninskie Gory, 119234, Moscow, Russia
  • Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academy of Sciences, 119991Moscow, Russia
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Michael J. Walter / Dmitry Pushcharovsvsky / Tetsuo Irifune
  • Geodynamics Research Center, Ehime University, Matsuyama 790-8577, Japan
  • Earth-Life Science Institute, Tokyo Institute of Technology, Tokyo 152-8550, Japan
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2017-01-03 | DOI: https://doi.org/10.2138/am-2017-5937

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

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About the article

Received: 2016-08-19

Accepted: 2016-11-13

Published Online: 2017-01-03

Published in Print: 2017-01-01


Citation Information: American Mineralogist, Volume 102, Issue 1, Pages 227–231, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2017-5937.

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© 2017 by Walter de Gruyter Berlin/Boston.

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