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Compressibility and structural stability of two variably hydrated olivine samples. (FO97Fa3) to 34 GPa by X-ray diffraction and Raman spectroscopy

  • Murli H. Manghnani EMAIL logo , Anwar Hushur , Joseph R. Smyth , Fabrizio Nestola , Przemyslaw Dera , Mariappan Sekar , George Amulele and Daniel J. Frost
Published/Copyright: March 7, 2015
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American Mineralogist
From the journal American Mineralogist Volume 98 Issue 11-12

Abstract

The content and transport of fluid phases such as water into the deep Earth is of great importance not only to correlate seismological models of the planet’s interior with mineralogical models, but also for the understanding of the evolution of the solid Earth as well as the Earth’s atmosphere. This study reports on the influence of water on the structural and physical properties of olivine, which is known to be the main constituent of the upper mantle.

Two hydrous olivines of composition Fo97Fa3 with water content of 4883 parts per million by weight (ppmw) (SZ0407A) and 8000 ppmw (SZ0407B) were synthesized at 1250 °C and 12 GPa. Single-crystal X‑ray diffraction was used to determine unit-cell parameters of SZ0407A and SZ0407B at pressures up to 7.1 GPa at room temperature. Synchrotron powder X‑ray diffraction and Raman scattering experiments were performed on sample SZ0407A in a diamond-anvil cell to 34 GPa at room temperature. For both samples, the compressibility is the largest along the b-axis and smallest along the a-axis. Using the compression (V/Vo) vs. pressure data for sample SZ0407A to 29 GPa, in conjunction with the third-order Birch-Murnaghan equation of state, we calculate the isothermal bulk modulus and its pressure derivative as K0 = 119.2(12) GPa and K′o = 6.6(4). Single-crystal compression data for sample SZ0407A to 7 GPa give Ko = 121.5(6) GPa and K′o = 5.7(2); and for sample SZ0407B Ko = 122.2(12) GPa and K′o = 6.2(4). High-pressure Raman spectra for SZ0407A up to 34 GPa show a continuous shift of all the observed bands to higher frequency with increasing pressure; there is no indication of any first-order phase transition. However, the Raman spectra indicate subtle discontinuous changes around 22 GPa, unobserved in previously reported studies on anhydrous olivines.

Keywords : Hydrous olivine; X‑ray diffraction; Raman spectroscopy; hydration mechanism; high pressure
Received: 2013-1-12
Accepted: 2013-7-17
Published Online: 2015-3-7
Published in Print: 2013-11-1

© 2015 by Walter de Gruyter Berlin/Boston

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  3. Amorphous Materials: Properties, structure, and durability. North American microtektites are more oxidized than tektites
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  26. Melting and subsolidus phase relations in the system Na2CO3-MgCO3±H2O at 6 GPa and the stability of Na2Mg(CO3)2 in the upper mantle
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https://doi.org/10.2138/am.2013.4462
Keywords for this article
Hydrous olivine; X‑ray diffraction; Raman spectroscopy; hydration mechanism; high pressure

Articles in the same Issue

  1. Highlights and Breakthroughs. Lessons from a lost technology: The secrets of Roman concrete
  2. Crossroads in Earth and Planetary Materials. H-D interdiffusion in brucite at pressures up to 15 GPa
  3. Amorphous Materials: Properties, structure, and durability. North American microtektites are more oxidized than tektites
  4. Actinides in Geology, Energy, and the Environment. Vorlanite, (CaU6+)O4, from Jabel Harmun, Palestinian Autonomy, Israel
  5. What Lurks in the Martian Rocks and Soil? Investigations of Sulfates, Phosphates, and Perchlorates. Mössbauer parameters of iron in sulfate minerals
  6. What Lurks in the Martian Rocks and Soil? Investigations of Sulfates, Phosphates, and Perchlorates. Looking for jarosite on Mars: The low-temperature crystal structure of jarosite
  7. Compressibility and structural stability of two variably hydrated olivine samples. (FO97Fa3) to 34 GPa by X-ray diffraction and Raman spectroscopy
  8. Interaction between composition and temperature effects on non-bridging oxygen and high-coordinated aluminum in calcium aluminosilicate glasses
  9. Topotactic transformation and dehydration of the zeolite gismondine to a novel Ca feldspar structure
  10. The origin of melanophlogite, a clathrate mineral, in natrocarbonatite lava at Oldoinyo Lengai, Tanzania
  11. Clay mineral evolution
  12. Experimental determination of solubilities of sodium tetraborate (borax) in NaCl solutions, and a thermodynamic model for the Na-B(OH)3-Cl-SO4 system to high-ionic strengths at 25 °C
  13. Thermodynamic basis for evolution of apatite in calcified tissues
  14. A first-principles calculation of the elastic and vibrational anomalies of lizardite under pressure
  15. Acoustic velocity measurements for stishovite across the post-stishovite phase transition under deviatoric stress: Implications for the seismic features of subducting slabs in the mid-mantle
  16. A new framework topology in the dehydrated form of zeolite levyne
  17. Mid- and far-infrared spectra of synthetic CaMg2(Al4–xGax)(Si1–yGey)O10(OH,OD)2- clintonite: Characterization and assignment of the Ca-Oinner and Ca-Oouter stretching bands
  18. Mechanism of mineral transformations in krennerite, Au3AgTe8, under hydrothermal conditions
  19. Cubic perovskite polymorph of strontium metasilicate at high pressures
  20. Size distributions of nanoparticles from magnetotactic bacteria as signatures of biologically controlled mineralization
  21. Medium-range order in disordered K-feldspars by multinuclear NMR
  22. Infrared signatures of OH-defects in wadsleyite: A first-principles study
  23. K-Ar dating and δ18O-δD characterization of nanometric illite from Ordovician. K-bentonites of the Appalachians: Illitization and the Acadian-Alleghenian tectonic activity
  24. New morphological, chemical, and structural data of woolly erionite-Na from Durkee, Oregon, U.S.A.
  25. New experimental data on phase relations for the system Na2CO3-CaCO3 at 6 GPa and 900–1400 ºC
  26. Melting and subsolidus phase relations in the system Na2CO3-MgCO3±H2O at 6 GPa and the stability of Na2Mg(CO3)2 in the upper mantle
  27. A critical comment on Ertl et al. (2012): “Limitations of Fe2+ and Mn2+ site occupancy in tourmaline: Evidence from Fe2+- and Mn2+-rich tourmaline”
  28. Letter. Developing vanadium valence state oxybarometers (spinel-melt, olivine-melt, spinel-olivine) and V/(Cr+Al) partitioning (spinel-melt) for martian olivine-phyric basalts
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