Details
| Original language | English |
|---|---|
| Pages (from-to) | 682-686 |
| Number of pages | 5 |
| Journal | American Mineralogist |
| Volume | 85 |
| Issue number | 5-6 |
| Publication status | Published - 1 May 2000 |
Abstract
Water solubility in silica melts was determined at 100-600 MPa, 1200-1350 °C, and at each temperature (T) was found to increase with pressure (P). At P ≤ 250 MPa, the effect of T on water solubility in silica melts is small and within analytical precision (±0.15 wt% H2O). A positive correlation with T was observed at 400 MPa. Increasing solubility of water with increasing T was observed when large amounts of water are dissolved in silica and quartzofeldspathic melts (i.e., when molecular water is the dominant species in the glasses at room temperature), as already observed for feldspar melts. Change in water solubility (expressed in mol%) with decreasing SiO2 content of the melt is nonlinear along the silica-albite join. In the compositional range Ab100 to Ab25 (100 to 25 mol% albite, respectively, compositions calculated on an eight-oxygen basis), the solubility of water at 200 MPa decreases only slightly with decreasing Ab content (-0.1 ± 0.01 mol% H2O per mol% albite). However, at Ab contents less than 25 mol%, water solubility decreases sharply with increasing Qz content. Similar behavior was observed at 500 MPa. These results suggest that two different incorporation mechanisms of water in quartzofeldspathic melts must be considered: one corresponding to an NaAlSi3O8-H2O mechanism, the other to an SiO2-H2O mechanism.
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geophysics
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
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In: American Mineralogist, Vol. 85, No. 5-6, 01.05.2000, p. 682-686.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Water solubility in silica and quartzofeldspathic melts
AU - Holtz, Francois
AU - Roux, Jacques
AU - Behrens, Harald
AU - Pichavant, Michel
N1 - Copyright: Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2000/5/1
Y1 - 2000/5/1
N2 - Water solubility in silica melts was determined at 100-600 MPa, 1200-1350 °C, and at each temperature (T) was found to increase with pressure (P). At P ≤ 250 MPa, the effect of T on water solubility in silica melts is small and within analytical precision (±0.15 wt% H2O). A positive correlation with T was observed at 400 MPa. Increasing solubility of water with increasing T was observed when large amounts of water are dissolved in silica and quartzofeldspathic melts (i.e., when molecular water is the dominant species in the glasses at room temperature), as already observed for feldspar melts. Change in water solubility (expressed in mol%) with decreasing SiO2 content of the melt is nonlinear along the silica-albite join. In the compositional range Ab100 to Ab25 (100 to 25 mol% albite, respectively, compositions calculated on an eight-oxygen basis), the solubility of water at 200 MPa decreases only slightly with decreasing Ab content (-0.1 ± 0.01 mol% H2O per mol% albite). However, at Ab contents less than 25 mol%, water solubility decreases sharply with increasing Qz content. Similar behavior was observed at 500 MPa. These results suggest that two different incorporation mechanisms of water in quartzofeldspathic melts must be considered: one corresponding to an NaAlSi3O8-H2O mechanism, the other to an SiO2-H2O mechanism.
AB - Water solubility in silica melts was determined at 100-600 MPa, 1200-1350 °C, and at each temperature (T) was found to increase with pressure (P). At P ≤ 250 MPa, the effect of T on water solubility in silica melts is small and within analytical precision (±0.15 wt% H2O). A positive correlation with T was observed at 400 MPa. Increasing solubility of water with increasing T was observed when large amounts of water are dissolved in silica and quartzofeldspathic melts (i.e., when molecular water is the dominant species in the glasses at room temperature), as already observed for feldspar melts. Change in water solubility (expressed in mol%) with decreasing SiO2 content of the melt is nonlinear along the silica-albite join. In the compositional range Ab100 to Ab25 (100 to 25 mol% albite, respectively, compositions calculated on an eight-oxygen basis), the solubility of water at 200 MPa decreases only slightly with decreasing Ab content (-0.1 ± 0.01 mol% H2O per mol% albite). However, at Ab contents less than 25 mol%, water solubility decreases sharply with increasing Qz content. Similar behavior was observed at 500 MPa. These results suggest that two different incorporation mechanisms of water in quartzofeldspathic melts must be considered: one corresponding to an NaAlSi3O8-H2O mechanism, the other to an SiO2-H2O mechanism.
UR - http://www.scopus.com/inward/record.url?scp=0034086518&partnerID=8YFLogxK
U2 - 10.2138/am-2000-5-604
DO - 10.2138/am-2000-5-604
M3 - Article
AN - SCOPUS:0034086518
VL - 85
SP - 682
EP - 686
JO - American Mineralogist
JF - American Mineralogist
SN - 0003-004X
IS - 5-6
ER -