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Crossroads in Earth and Planetary Materials. H-D interdiffusion in brucite at pressures up to 15 GPa

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Published/Copyright: March 7, 2015
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American Mineralogist
From the journal American Mineralogist Volume 98 Issue 11-12

Abstract

Proton diffusion in brucite was investigated by conducting hydrogen-deuterium (H-D) exchange experiments using multi-anvil high-pressure apparatuses at pressures from 3 to 15 GPa and temperatures in the range of 750-1050 K. The diffusion couple was composed of a natural proton-dominated brucite single crystal surrounded by synthesized D-doped brucite polycrystals. Micro-Raman spectroscopy was used to determine the diffusion profiles of the samples. The D/H diffusion profile across the boundary between single crystal and polycrystalline D-doped brucite showed an asymmetric pattern characterized by faster diffusion in aggregates. The D/H interdiffusion rate determined from the analysis of the single crystal side indicates that the interdiffusion rate increases with increasing H/D ratio. The H-D interdiffusion rate in the direction perpendicular to the c-axis is about 0.5 orders of magnitude higher than that in the direction parallel to the c-axis. At 3 GPa, the H-D interdiffusion coefficients [D(m2/s)] along and perpendicular to the c-axis of brucite at compositions of CODnorm = 0.2 in the single-crystal region were determined to be 3.30(±1.77) ×10−11exp[-48.2(±5.8) (kJ/mol)/ RT] and 1.43(±1.33) ×10−9exp[-67.5(±23.2) (kJ/mol)/RT], respectively. The H-D interdiffusion rate perpendicular to and along the c-axis increased about one order of magnitude by compression from 3 to 10 GPa, but the pressure enhancement became weaker above 10 GPa. From 10 to 15 GPa, there is almost no pressure dependence of proton diffusion for both directions. As pressure increases up to 10 GPa, enhancement of the proton migration is strongly correlated with the activation of the atomic interaction and decrease of O…O′ distance induced by compression. The positive pressure effect on the proton diffusion in brucite suggests that proton diffusion in higher-pressure hydrous phase becomes faster because of the shorter O…O′ distance.

Keywords : Brucite; H-D interdiffusion; diffusion; high pressure; Raman spectroscopy
Received: 2013-3-26
Accepted: 2013-6-18
Published Online: 2015-3-7
Published in Print: 2013-11-1

© 2015 by Walter de Gruyter Berlin/Boston

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  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
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  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”
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https://doi.org/10.2138/am.2013.4550
Keywords for this article
Brucite; H-D interdiffusion; diffusion; high pressure; Raman spectroscopy

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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