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In-situ mid/far micro-FTIR spectroscopy to trace pressure-induced phase transitions in strontium feldspar and wadsleyite

  • Maria Mrosko EMAIL logo , Monika Koch-Müller and Ulrich Schade
Published/Copyright: April 2, 2015
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American Mineralogist
From the journal American Mineralogist Volume 96 Issue 11-12

Abstract

As representatives of nominally anhydrous minerals (NAMs) in the crust and mantle the pressuredependent behavior of strontium feldspar and wadsleyite, containing different amounts of water, was studied in a diamond-anvil cell via mid and far IR spectroscopy up to 24 GPa. The samples were synthesized in a piston-cylinder press at 2 GPa/700 °C (strontium feldspar) and in a multi-anvil apparatus at 13.8 GPa/1000 °C (dry wadsleyite) and 13.2 GPa/1150 °C (hydrous wadsleyite). The water content of the samples was determined by polarized FTIR and Raman spectroscopy. The strontium feldspar crystals (up to 300 μm) contained about 1100(100) wt ppm water. The hydrous wadsleyite crystals (up to 240 μm) contained 12 500(900) wt ppm water. The synthesis of dry wadsleyite yielded a fine-grained powder. A new THz/FIR-microscope for the synchrotron source BESSY was developed to conduct the diamond-anvil cell measurements in the far IR region. Conventional in-situ mid IR spectroscopy was also performed on all samples. The measurements on strontium feldspar showed a phase transformation at 6.5(5) GPa (space group I2/c to P21/c). The wadsleyite analyses revealed a phase transition at approximately 8.4(7) GPa in the hydrous and approximately 10.0(7) GPa in the dry sample. It probably represents a transition from an orthorhombic to a monoclinic structure. The high amount of water incorporated in the hydrous wadsleyite shifts the transformation toward lower pressures compared to the dry one. By comparison, the relatively low amount of water in strontium feldspar does not change the stability relations compared to the dry one. Therefore, water incorporation in nominally anhydrous minerals may have an effect on the pressure of phase transitions, whereas the extent of that influence strongly depends on the structure of the phase and the amount of water carried within the mineral.

Keywords : Wadsleyite; strontium feldspar; mid/far FTIR spectroscopy; phase transition; water
Received: 2010-10-26
Accepted: 2011-7-1
Published Online: 2015-4-2
Published in Print: 2011-11-1

© 2015 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am.2011.3731
Keywords for this article
Wadsleyite; strontium feldspar; mid/far FTIR spectroscopy; phase transition; water

Articles in the same Issue

  1. In situ stress-strain measurements in a deformation-DIA apparatus at P-T conditions of the upper part of the mantle transition zone
  2. Element diffusion rates in lunar granulitic breccias: Evidence for contact metamorphism on the Moon
  3. The crystal structure of franckeite, Pb21.7Sn9.3Fe4.0Sb8.1S56.9
  4. Ammonium vermiculite in schists from the Betic Cordillera (Spain)
  5. Natrolite is not a “soda-stone” anymore: Structural study of alkali (Li+), alkaline-earth (Ca2+, Sr2+, Ba2+) and heavy metal (Cd2+, Pb2+, Ag+) cation-exchanged natrolites
  6. Analysis of hydrogen in olivine by SIMS: Evaluation of standards and protocol
  7. New accurate elastic parameters for the forsterite-fayalite solid solution
  8. In-situ mid/far micro-FTIR spectroscopy to trace pressure-induced phase transitions in strontium feldspar and wadsleyite
  9. Structural study of the coherent dehydration of wadsleyite
  10. An atomic force microscopy study of diamond dissolution features: The effect of H2O and CO2 in the fluid on diamond morphology
  11. Unraveling the stacking structure in tubular halloysite using a new TEM with computer-assisted minimal-dose system
  12. High-pressure structural behavior of α-Fe2O3 studied by single-crystal X-ray diffraction and synchrotron radiation up to 25 GPa
  13. The IR vibrational properties of six members of the garnet family: A quantum mechanical ab initio study
  14. On the presence of OH defects in the zircon-type phosphate mineral xenotime, (Y,REE)PO4
  15. Cesium and strontium incorporation into zeolite-type phases during homogeneous nucleation from caustic solutions
  16. Electrical conductivity of albite at high temperatures and high pressures
  17. Crystal-chemical and structural characterization of fluorapatites in ejecta from Somma-Vesuvius volcanic complex
  18. In situ ion-microprobe determination of trace element partition coefficients for hornblende, plagioclase, orthopyroxene, and apatite in equilibrium with natural rhyolitic glass, Little Glass Mountain Rhyolite, California
  19. In situ FTIR investigations at varying temperatures on hydrous components in rutile
  20. Methods to analyze metastable and microparticulate hydrated and hydrous iron sulfate minerals
  21. Crystal chemistry of Ti-rich ferriallanite-(Ce) from Cape Ashizuri, Shikoku Island, Japan
  22. Replacement of pyrrhotite by pyrite and marcasite under hydrothermal conditions up to 220 °C: An experimental study of reaction textures and mechanisms
  23. Argandite, Mn7(VO4)2(OH)8, the V analogue of allactite from the metamorphosed Mn ores at Pipji, Turtmann Valley, Switzerland
  24. Murchisite, Cr5S6, a new mineral from the Murchison meteorite
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