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Synthesis and structural analysis of CaFe2O4-type single crystals in the NaAlSiO4-MgAl2O4-Fe3O4 system

  • Takayuki Ishii ORCID logo , Giacomo Criniti ORCID logo , Xiaoyu Wang , Konstantin Glazyrin and Tiziana Boffa Ballaran
Published/Copyright: January 3, 2023
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American Mineralogist
From the journal American Mineralogist Volume 108 Issue 1

Abstract

Orthorhombic CaFe2O4-structured (Cf) Na-rich aluminous silicate (space group Pbnm) is a major mineral of metabasaltic rocks at lower mantle conditions and can, therefore, significantly affect the physical properties of subducted oceanic crusts. We attempted to synthesize single crystals of Cf-type phases in the systems NaAlSiO4, NaAlSiO4-MgAl2O4, NaAlSiO4-MgAl2O4-Fe3O4, and NaAlSiO4- MgAl2O4-Fe3O4-H2O at 23–26 GPa and 1100–2200 °C. Under dry conditions, single crystals of Cf-type phase up to 100–150 μm in size were recovered from 23 GPa and 2000–2200 °C. Single-crystal X-ray diffraction and composition analyses suggest that the synthesized Cf-type phases have a few percent of vacancies in the eightfold-coordinated site with Na, Mg, and Fe2+ and partially disordered Al and Si in the octahedral sites. Iron-bearing Cf-type phases have 32–34% Fe3+ that is hosted both in the octahedral sites and in the eightfold-coordinated site. In NaAlSiO4-MgAl2O4-Fe3O4-H2O system, no formation of Cf-type phase was observed at 24 GPa and 1100–2000 °C due to the formation of hydrous Na-rich melt and Al-rich oxides or hydroxides, suggesting the possible absence of Cf-type phase in the hydrous basaltic crust. The single-crystal syntheses of Cf-type phases will be useful for investigating their physical properties, potentially improving models of lower mantle structure and dynamics.

Keywords: Calcium ferrite; single crystal; multi-anvil press; high pressure; basaltic crust

Acknowledgments and Funding

We thank H. Fischer and R. Njul for the preparation of cell assemblies and sample preparation for SEM and EPMA measurements, respectively. This work was supported by the National Natural Science Foundation of China, the National Key Research Major Research Plan on West-Pacific Earth System Multispheric Interactions (92158206 to R. Tao and T.I.). We also thank an anonymous reviewer for constructive comments. Parts of this research were carried out at the P02.2 beamline of PETRA III, DESY and we acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for the provision of experimental facilities.

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https://doi.org/10.2138/am-2022-8748
Keywords for this article
Calcium ferrite; single crystal; multi-anvil press; high pressure; basaltic crust

Articles in the same Issue

  1. MSA Review
  2. Nickel in olivine as an exploration indicator for magmatic Ni-Cu sulfide deposits: A data review and re-evaluation
  3. Repeat, fast, and high-resolution mapping of fine-scale trace element distribution in pyrite and marcasite by LA-Q-ICP-MS with the Aerosol Rapid Introduction System (ARIS)
  4. Continuous Be mineralization from two-mica granite to pegmatite: Critical element enrichment processes in a Himalayan leucogranite pluton
  5. An evolutionary system of mineralogy, Part VI: Earth’s earliest Hadean crust (>4370 Ma)
  6. Oxidation or cation re-arrangement? Distinct behavior of riebeckite at high temperature
  7. Fe3+/FeT ratios of amphiboles determined by high spatial resolution single-crystal synchrotron Mössbauer spectroscopy
  8. How clay delamination supports aseismic slip
  9. The influence of Al2O3 on the structural properties of MgSiO3 akimotoite
  10. Atomistic insight into the ferroelastic post-stishovite transition by high-pressure single-crystal X-ray diffraction
  11. Epidote as a conveyor of water into the Earth’s deep mantle in subduction zones: Insights from coupled high-pressure and high-temperature experiments
  12. Potential link between antigorite dehydration and shallow intermediate-depth earthquakes in hot subduction zones
  13. Stability of Fe5O6 and its relation to other Fe-Mg-oxides at high pressures and temperatures
  14. From schwertmannite to natrojarosite: Long-term stability and kinetic approach
  15. Trace element and isotopic (S, Pb) constraints on the formation of the giant Chalukou porphyry Mo deposit, NE China
  16. Textural and chemical evolution of magnetite from the Paleozoic Shuanglong Fe-Cu deposit: Implications for tracing ore-forming fluids
  17. Jingwenite-(Y) from the Yushui Cu deposit, South China: The first occurrence of a V-HREE-bearing silicate mineral
  18. Wenjiite, Ti10(Si,P,◻)7, and kangjinlaite, Ti11(Si,P)10, new minerals in the ternary Ti-P-Si system from the Luobusa ophiolite, Tibet, China
  19. Evaluating the physicochemical conditions for gold occurrences in pyrite
  20. Letter
  21. Synthesis and structural analysis of CaFe2O4-type single crystals in the NaAlSiO4-MgAl2O4-Fe3O4 system
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