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Local structure variations observed in orthoenstatite at high pressures

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Veröffentlicht/Copyright: 2. April 2015
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 96 Heft 10

Abstract

The site-specific behavior of iron in an orthoenstatite-structured 57Fe-enriched (M1)(M2)Si2O6 powdered sample was explored using synchrotron Mössbauer spectroscopy and diamond-anvil cells in two independent experiments at ambient temperature. In one experiment, NaCl was used as the pressure- transmitting medium (ambient pressure to 36 GPa), and in the other experiment, Ne surrounded the sample (4.1 to 26.8 GPa). The hyperfine parameters of the M1 and M2 sites at room pressure are in excellent agreement with previous literature values obtained using conventional Mössbauer spectroscopy and yield (Mg0.980Fe0.020(5))(Mg0.760Fe0.240)Si2O6 as the chemical formula. Analyses of both data sets reveal a change in the trend or discontinuity in the hyperfine parameters around 10 GPa, indicative of a transformation in orthopyroxene. However, the detailed behaviors of the iron sites with pressure appear to depend on the local stress conditions provided by the different pressure media. Our observations may help explain the reported variations in structural transition behavior for orthopyroxenes at high pressures.

Keywords : Orthoenstatite; pyroxene; upper mantle; Mössbauer spectroscopy; nuclear resonant scattering
Received: 2010-10-14
Accepted: 2011-6-17
Published Online: 2015-4-2
Published in Print: 2011-10-1

© 2015 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am.2011.3721
Schlagwörter für diesen Artikel
Orthoenstatite; pyroxene; upper mantle; Mössbauer spectroscopy; nuclear resonant scattering

Artikel in diesem Heft

  1. Compressional wave velocity measurements through sandy sediments containing methane hydrate
  2. The turquoise-chalcosiderite Cu(Al,Fe3+)6(PO4)4(OH)8·4H2O solid-solution series: A Mössbauer spectroscopy, XRD, EMPA, and FTIR study
  3. Variability in sepiolite: Diffraction studies
  4. Rankamaite from the Urubu pegmatite, Itinga, Minas Gerais, Brazil: Crystal chemistry and Rietveld refinement
  5. Zeolitic-type Brønsted-Lowry sites distribution imaged on clinochlore
  6. Thermodynamic properties of alloys of gold-74/palladium-26 with variable amounts of iron and the use of Au-Pd-Fe alloys as containers for experimental petrology
  7. first-principles investigation of hydrous defects and IR frequencies in forsterite: The case for Si vacancies
  8. Estimating compositions of natural ringwoodite in the heavily shocked Grove Mountains 052049 meteorite from Raman spectra
  9. Phase stability and compression study of (Fe0.89,Ni0.11)3S up to pressure of the Earth’s core
  10. The compression pathway of quartz
  11. Experimental investigations into the silicification of olivine: Implications for the reaction mechanism and acid neutralization
  12. The effect of polymorphic structure on the structural and chemical stability of yttrium disilicates
  13. Diffusion in yttrium aluminium garnet at the nanometer-scale: Insight into the effective grain boundary width
  14. Elasticity and anisotropy of Fe3C at high pressures
  15. Raman spectroscopy of titanomagnetites: Calibration of the intensity of Raman peaks as a sensitive indicator for their Ti content
  16. Experimental determination of stability relations between monazite, fluorapatite, allanite, and REE-epidote as a function of pressure, temperature, and fluid composition
  17. Quantum-mechanical calculations of the Raman spectra of Mg- and Fe-cordierite
  18. Coarsening kinetics of coexisting peristerite and film microperthite over 104 to 105 years
  19. Local structure variations observed in orthoenstatite at high pressures
  20. Static disorders of atoms and experimental determination of Debye temperature in pyrope: Low- and high-temperature single-crystal X-ray diffraction study
  21. Effect of hydration on the single-crystal elasticity of Fe-bearing wadsleyite to 12 GPa
  22. Early Proterozoic weathering processes under low O2 conditions reconstructed from a 2.45 Ga paleosol in Pronto, Canada
  23. Eliseevite, Na1.5Li[Ti2Si4O12.5(OH)1.5]∙2H2O, a new microporous titanosilicate from the Lovozero alkaline massif (Kola Peninsula, Russia)
  24. The development of shape- and crystallographic-preferred orientation in CaPtO3 post-perovskite deformed in pure shear
  25. Amorphous Materials. An experimental study of phosphorous and aluminosilicate speciation in and partitioning between aqueous fluids and silicate melts determined in-situ at high temperature and pressure
  26. Letter. Differential degassing of H2O, Cl, F, and S: Potential effects on lunar apatite
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