Startseite The speciation of dissolved H2O in dacitic melt
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The speciation of dissolved H2O in dacitic melt

  • Yang Liu EMAIL logo , Harald Behrens und Youxue Zhang
Veröffentlicht/Copyright: 28. März 2015
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 89 Heft 2-3

Abstract

We report the first systematic study of H2O speciation in dacitic melt with total dissolved H2O ranging from 1.4 to 2.6 wt%. Samples were heated in a one-atmosphere tube furnace at 480-590 °C for certain durations and then quenched in water or air. Species concentrations were measured with Fourier transform infrared (FTIR) spectroscopy. At a given temperature, the equilibrium constant for the reaction, H2Om (melt) + O (melt) = 2OH (melt), is roughly constant. At the same temperature and water content, the equilibrium constant for the hydrous species interconversion reaction in dacitic melt appears to be slightly greater than in hydrous rhyolitic melt, reflecting a larger proportion of dissolved H2O as hydroxyl groups in dacitic melt. Our results can be applied to model species equilibrium in hydrous dacitic melt, to estimate the apparent equilibrium temperature of natural dacitic glasses, and to investigate viscosity of hydrous dacitic melts.

Received: 2003-2-4
Accepted: 2003-9-29
Published Online: 2015-3-28
Published in Print: 2004-2-1

© 2015 by Walter de Gruyter Berlin/Boston

Artikel in diesem Heft

  1. Composition and I4/m-P42/n phase transition in scapolite solid solutions
  2. Synthesis and characterization of K2Ca5(SO4)6·H2O, the equivalent of görgeyite, a rare evaporite mineral
  3. Phase relations in the system Fe-FeSi at 21 GPa
  4. The speciation of dissolved H2O in dacitic melt
  5. Nucleation and growth kinetics of the α-β transformation in Mg2SiO4determined by in situ synchrotron powder X-ray diffraction
  6. Experimental determination of siderite stability and application to Martian Meteorite ALH84001
  7. Determination of the molar absorption coefficient for the infrared absorption band of CO2in rhyolitic glasses
  8. Crystallographic properties of the calcium phosphate mineral, brushite, by means of First Principles calculations
  9. The crystal structure of jonesite, Ba2(K,Na)[Ti2(Si5Al)O18(H2O)](H2O)n: A first example of titanosilicate with porous double layers
  10. Crystal-chemistry of talc: A near infrared (NIR) spectroscopy study
  11. Synthesis of beryllian sapphirine in the system MgO-BeO-Al2O3-SiO2-H2O and comparison with naturally occurring beryllian sapphirine and khmaralite, Part 2: A chemographic study of Be content as a function of P, T, assemblage and FeMg–1exchange
  12. Spriggite, Pb3[(UO2)6O8(OH)2](H2O)3, a new mineral with β-U3O8–type sheets: Description and crystal structure
  13. Sieve-textured plagioclase in dacitic magma: Interference imaging results
  14. Single crystal raman spectroscopy of cerussite
  15. Sodalite: High-temperature structures obtained from synchrotron radiation and Rietveld refinements
  16. The structure of metahohmannite, Fe3+2[O(SO4)2]⋅4H2O, by in situ synchrotron powder diffraction
  17. High-pressure synchrotron X-ray diffraction study of spessartine and uvarovite: A comparison between different equation of state models
  18. Quantum calculations of the electronic structure and NMR quadrupolar interaction parameters for tugtupite
  19. Identification of pyrite valence band contributions using synchrotron-excited X-ray photoelectron spectroscopy
  20. Micro-Raman studies of gypsum in the temperature range between 9 K and 373 K
  21. A new rare earth disilicate (REE2Si2O7; REE = Dy, Tm, Lu; type-L): Evidence for nonquenchable 10 GPa polymorph with silicon in fivefold trigonal bipyramidal coordination?
  22. Structural variations in the brownmillerite series Ca2(Fe2–xAlx)O5: Single-crystal X-ray diffraction at 25 °C and high-temperature X-ray powder diffraction (25 °C ≤ T ≤ 1000 °C)
  23. Peculiarity and defect structure of the natural and synthetic zeolite mordenite: A single-crystal X-ray study
  24. Model independent phase equilibrium constraints on the ferrosilite activity in the binary Fe-Mg orthopyroxene solid solution
  25. Microstructural study of synthetic sintered diamond and comparison with carbonado, a natural polycrystalline diamond
  26. Structural and chemical response to varying [4]B content in zoned Fe-bearing olenite from Koralpe, Austria
  27. A new dense silica polymorph: A possible link between tetrahedrally and octahedrally coordinated silica
  28. Epitaxial relationships of clinopyroxene-hosted magnetite determined using electron backscatter diffraction (EBSD) technique
https://doi.org/10.2138/am-2004-2-304

Artikel in diesem Heft

  1. Composition and I4/m-P42/n phase transition in scapolite solid solutions
  2. Synthesis and characterization of K2Ca5(SO4)6·H2O, the equivalent of görgeyite, a rare evaporite mineral
  3. Phase relations in the system Fe-FeSi at 21 GPa
  4. The speciation of dissolved H2O in dacitic melt
  5. Nucleation and growth kinetics of the α-β transformation in Mg2SiO4determined by in situ synchrotron powder X-ray diffraction
  6. Experimental determination of siderite stability and application to Martian Meteorite ALH84001
  7. Determination of the molar absorption coefficient for the infrared absorption band of CO2in rhyolitic glasses
  8. Crystallographic properties of the calcium phosphate mineral, brushite, by means of First Principles calculations
  9. The crystal structure of jonesite, Ba2(K,Na)[Ti2(Si5Al)O18(H2O)](H2O)n: A first example of titanosilicate with porous double layers
  10. Crystal-chemistry of talc: A near infrared (NIR) spectroscopy study
  11. Synthesis of beryllian sapphirine in the system MgO-BeO-Al2O3-SiO2-H2O and comparison with naturally occurring beryllian sapphirine and khmaralite, Part 2: A chemographic study of Be content as a function of P, T, assemblage and FeMg–1exchange
  12. Spriggite, Pb3[(UO2)6O8(OH)2](H2O)3, a new mineral with β-U3O8–type sheets: Description and crystal structure
  13. Sieve-textured plagioclase in dacitic magma: Interference imaging results
  14. Single crystal raman spectroscopy of cerussite
  15. Sodalite: High-temperature structures obtained from synchrotron radiation and Rietveld refinements
  16. The structure of metahohmannite, Fe3+2[O(SO4)2]⋅4H2O, by in situ synchrotron powder diffraction
  17. High-pressure synchrotron X-ray diffraction study of spessartine and uvarovite: A comparison between different equation of state models
  18. Quantum calculations of the electronic structure and NMR quadrupolar interaction parameters for tugtupite
  19. Identification of pyrite valence band contributions using synchrotron-excited X-ray photoelectron spectroscopy
  20. Micro-Raman studies of gypsum in the temperature range between 9 K and 373 K
  21. A new rare earth disilicate (REE2Si2O7; REE = Dy, Tm, Lu; type-L): Evidence for nonquenchable 10 GPa polymorph with silicon in fivefold trigonal bipyramidal coordination?
  22. Structural variations in the brownmillerite series Ca2(Fe2–xAlx)O5: Single-crystal X-ray diffraction at 25 °C and high-temperature X-ray powder diffraction (25 °C ≤ T ≤ 1000 °C)
  23. Peculiarity and defect structure of the natural and synthetic zeolite mordenite: A single-crystal X-ray study
  24. Model independent phase equilibrium constraints on the ferrosilite activity in the binary Fe-Mg orthopyroxene solid solution
  25. Microstructural study of synthetic sintered diamond and comparison with carbonado, a natural polycrystalline diamond
  26. Structural and chemical response to varying [4]B content in zoned Fe-bearing olenite from Koralpe, Austria
  27. A new dense silica polymorph: A possible link between tetrahedrally and octahedrally coordinated silica
  28. Epitaxial relationships of clinopyroxene-hosted magnetite determined using electron backscatter diffraction (EBSD) technique
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