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Solubility behavior of water in haploandesitic melts at high pressure and high temperature

  • Bjorn O. Mysen EMAIL logo and Kevin Wheeler
Published/Copyright: March 25, 2015
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American Mineralogist
From the journal American Mineralogist Volume 85 Issue 9

Abstract

The solubility of H2O in three melt compositions along the haploandesite join Na2Si4O9- Na2(NaAl)4O9 (0, 3, and 6 mol% Al2O3) was determined as a function of pressure and temperature from 0.8 to 2.0 GPa and 1000 to 1300 °C. Water solubility is a linear (or near-linear) positive function of pressure (16-18 mol% H2O/GPa) at constant temperature, and a negative near-linear function of temperature (1-2 mol% H2O/100 °C) at constant pressure. The solubility is correlated negatively with Al2O3 content of the melts.

Partial molar volume of H2O in the melt, V̅H2Omelt , was derived from solubility isotherms (1000, 1100, 1200, and 1300 °C) at 0.8, 1.05, 1.3, 1.65, and 2.0 GPa pressure. Values range between 7.8 and 12.8 cm3/mol, and decrease with increasing Al2O3 content. In the pressure-temperature range studied, (∂V̅H₂Omelt/∂T)p ranges from -7.1 ± 0.810-3 to -5.6 ± 1.3·10-3 cm3/mol °C, becoming slightly less negative as the melts become more aluminous.

The V̅H₂Omelt values were combined with published partial molar volume information for anhydrous oxides in silicate melts to estimate densities of water-rich dacitic magmas in shallow magma chambers associated with explosive volcanism. For a chamber of constant bulk composition during a comparatively short explosive event, such as that of Mount Pinatubo in June 1991 or Mount St. Helens in May 1980, the average density of the magma after eruption is ~3% higher than before the eruption occurred. Furthermore, because of removal of overburden during an eruption, the H2O saturation value of remaining magma is less than that prior to eruption. From density calculations of the residual hydrous magma after eruption, its density decreases from top to bottom in the magma chamber. Consequently, this magma is gravitationally unstable.

Received: 1999-10-19
Accepted: 2000-4-20
Published Online: 2015-3-25
Published in Print: 2000-8-1

© 2015 by Walter de Gruyter Berlin/Boston

Articles in the same Issue

  1. Measurement of crystal size distributions
  2. Pressure dependence of the solubility of Ar and Kr in melts of the system SiO2-NaAlSi2O6
  3. Solubility behavior of water in haploandesitic melts at high pressure and high temperature
  4. Proton-containing defects at forsterite {010} tilt grain boundaries and stepped surfaces
  5. Incorporation of Fe3+ into forsterite and wadsleyite
  6. Molecular dynamics simulation of Al/Si-ordered plagioclase feldspar
  7. Cation ordering and structural variations with temperature in MgAl2O4 spinel: An X-ray single-crystal study
  8. Aluminium coordination in tektites: A XANES study
  9. Crystal structure of Cr-mullite
  10. Structure of synthetic 2-line ferrihydrite by electron nanodiffraction
  11. Transmission electron microscopy study of gaudefroyite, Ca8Mn6 3+[(BO3)6(CO3)2O6]
  12. Nano- to micro-scale decompression products in ultrahigh-pressure phengite: HRTEM and AEM study, and some petrological implications
  13. New insights into the mechanism for chloritization of biotite using polytype analysis
  14. The dissolution of hectorite: In-situ, real-time observations using atomic force microscopy
  15. Quantification of minor phases in growth kinetics experiments with powder X-ray diffraction
  16. Illite-smectite structural changes during metamorphism in black Cambrian Alum shales from the Baltic area
  17. The tremolite-actinolite-ferro–actinolite series: Systematic relationships among cell parameters, composition, optical properties, and habit, and evidence of discontinuities
  18. Cordierite I: The coordination of Fe2+
  19. Cordierite II: The role of CO2 and H2O
  20. Crystal chemical variations in Li- and Fe-rich micas from Pikes Peak batholith (central Colorado)
  21. The crystal structure of TlAlSiO4: The role of inert pairs in exclusion of Tl from silicate minerals
  22. The structure of agrinierite: a Sr-containing uranyl oxide hydrate mineral
  23. The crystal structure of namibite, Cu(BiO)2VO4(OH), and revision of its symmetry
  24. The crystal structure of pararobertsite and its relationship to mitridatite
  25. Description and crystal structure of cabalzarite Ca(Mg,Al,Fe)2(AsO4)2(H2O,OH)2, a new mineral of the tsumcorite group
  26. Tegengrenite, a new, rhombohedral spinel-related Sb mineral from the Jakobsberg Fe-Mn deposit, Värmland, Sweden
https://doi.org/10.2138/am-2000-8-903

Articles in the same Issue

  1. Measurement of crystal size distributions
  2. Pressure dependence of the solubility of Ar and Kr in melts of the system SiO2-NaAlSi2O6
  3. Solubility behavior of water in haploandesitic melts at high pressure and high temperature
  4. Proton-containing defects at forsterite {010} tilt grain boundaries and stepped surfaces
  5. Incorporation of Fe3+ into forsterite and wadsleyite
  6. Molecular dynamics simulation of Al/Si-ordered plagioclase feldspar
  7. Cation ordering and structural variations with temperature in MgAl2O4 spinel: An X-ray single-crystal study
  8. Aluminium coordination in tektites: A XANES study
  9. Crystal structure of Cr-mullite
  10. Structure of synthetic 2-line ferrihydrite by electron nanodiffraction
  11. Transmission electron microscopy study of gaudefroyite, Ca8Mn6 3+[(BO3)6(CO3)2O6]
  12. Nano- to micro-scale decompression products in ultrahigh-pressure phengite: HRTEM and AEM study, and some petrological implications
  13. New insights into the mechanism for chloritization of biotite using polytype analysis
  14. The dissolution of hectorite: In-situ, real-time observations using atomic force microscopy
  15. Quantification of minor phases in growth kinetics experiments with powder X-ray diffraction
  16. Illite-smectite structural changes during metamorphism in black Cambrian Alum shales from the Baltic area
  17. The tremolite-actinolite-ferro–actinolite series: Systematic relationships among cell parameters, composition, optical properties, and habit, and evidence of discontinuities
  18. Cordierite I: The coordination of Fe2+
  19. Cordierite II: The role of CO2 and H2O
  20. Crystal chemical variations in Li- and Fe-rich micas from Pikes Peak batholith (central Colorado)
  21. The crystal structure of TlAlSiO4: The role of inert pairs in exclusion of Tl from silicate minerals
  22. The structure of agrinierite: a Sr-containing uranyl oxide hydrate mineral
  23. The crystal structure of namibite, Cu(BiO)2VO4(OH), and revision of its symmetry
  24. The crystal structure of pararobertsite and its relationship to mitridatite
  25. Description and crystal structure of cabalzarite Ca(Mg,Al,Fe)2(AsO4)2(H2O,OH)2, a new mineral of the tsumcorite group
  26. Tegengrenite, a new, rhombohedral spinel-related Sb mineral from the Jakobsberg Fe-Mn deposit, Värmland, Sweden
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