Details
| Original language | English |
|---|---|
| Pages (from-to) | 803-814 |
| Number of pages | 12 |
| Journal | European journal of mineralogy |
| Volume | 15 |
| Issue number | 5 |
| Publication status | Published - 17 Nov 2003 |
Abstract
The solubility of water in melts of the haplobasaltic system pressures of 50, 200 and 500 MPa and at temperatures between 1200°C and 1420°C using an internally heated gas pressure vessel. Compositions close to the binary joins Ab100-An100 and Ab50Di50-An50Di50 were studied. The water content of the glasses was analysed using Karl-Fischer-titration and near-infrared (NIR) spectroscopy. Linear molar absorption coefficients for the NIR combination bands of OH groups at 4500 cm-1 (εOH) and molecular H2O at 5200 cm-1 (εH2O) were determined for Ab50An50, An56Di44, and Ab54Di46 compositions. Concentration of OH groups is found to be significantly higher in Ab50An50 glasses than in other glasses quenched at similar rate. This is attributed to the depolymerisation of the network structure enabling the formation of stable Ca-complexes in the glasses. An increase in pressure from 50 to 200 or from 200 to 500 MPa approximately doubles the water solubility in haplobasaltic melts. Depending on compositions 2.0-3.0 wt% water can be dissolved at 50 MPa, 3.7-6.1 w1% at 200 Mpa and 7.6-12.4 wt% at 500 MPa. In general, the lowest H20 solubility was found in the An56Di44 melt. At 50 MPa, the variation of water solubility with composition appears to be complex but the precision of the data does not allow to extract reliably compositional trends. In general, data at 200 and 500 MPa show a strong decrease in H2O solubility with increasing Di content, e.g. from 5.99 wt% (Ab100) to 4.94 wt% (Ab54Di46) and from 5.81 wt% (Ab50An50) to 5.21 wt% (Ab27An29Di44) at 1200°C/200 MPa. The effect of Ab/An ratio on water solubility appears to be small at 200 MPa. In contrast, at 500 MPa the water solubility decreases strongly with increasing An content of the melt.
Keywords
- HO speciation, Haplobasaltic melts, IR spectroscopy, Karl-Fischer titration, Water solubility
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
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In: European journal of mineralogy, Vol. 15, No. 5, 17.11.2003, p. 803-814.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Water solubility in haplobasaltic melts
AU - Benne, Darja
AU - Behrens, Harald
PY - 2003/11/17
Y1 - 2003/11/17
N2 - The solubility of water in melts of the haplobasaltic system pressures of 50, 200 and 500 MPa and at temperatures between 1200°C and 1420°C using an internally heated gas pressure vessel. Compositions close to the binary joins Ab100-An100 and Ab50Di50-An50Di50 were studied. The water content of the glasses was analysed using Karl-Fischer-titration and near-infrared (NIR) spectroscopy. Linear molar absorption coefficients for the NIR combination bands of OH groups at 4500 cm-1 (εOH) and molecular H2O at 5200 cm-1 (εH2O) were determined for Ab50An50, An56Di44, and Ab54Di46 compositions. Concentration of OH groups is found to be significantly higher in Ab50An50 glasses than in other glasses quenched at similar rate. This is attributed to the depolymerisation of the network structure enabling the formation of stable Ca-complexes in the glasses. An increase in pressure from 50 to 200 or from 200 to 500 MPa approximately doubles the water solubility in haplobasaltic melts. Depending on compositions 2.0-3.0 wt% water can be dissolved at 50 MPa, 3.7-6.1 w1% at 200 Mpa and 7.6-12.4 wt% at 500 MPa. In general, the lowest H20 solubility was found in the An56Di44 melt. At 50 MPa, the variation of water solubility with composition appears to be complex but the precision of the data does not allow to extract reliably compositional trends. In general, data at 200 and 500 MPa show a strong decrease in H2O solubility with increasing Di content, e.g. from 5.99 wt% (Ab100) to 4.94 wt% (Ab54Di46) and from 5.81 wt% (Ab50An50) to 5.21 wt% (Ab27An29Di44) at 1200°C/200 MPa. The effect of Ab/An ratio on water solubility appears to be small at 200 MPa. In contrast, at 500 MPa the water solubility decreases strongly with increasing An content of the melt.
AB - The solubility of water in melts of the haplobasaltic system pressures of 50, 200 and 500 MPa and at temperatures between 1200°C and 1420°C using an internally heated gas pressure vessel. Compositions close to the binary joins Ab100-An100 and Ab50Di50-An50Di50 were studied. The water content of the glasses was analysed using Karl-Fischer-titration and near-infrared (NIR) spectroscopy. Linear molar absorption coefficients for the NIR combination bands of OH groups at 4500 cm-1 (εOH) and molecular H2O at 5200 cm-1 (εH2O) were determined for Ab50An50, An56Di44, and Ab54Di46 compositions. Concentration of OH groups is found to be significantly higher in Ab50An50 glasses than in other glasses quenched at similar rate. This is attributed to the depolymerisation of the network structure enabling the formation of stable Ca-complexes in the glasses. An increase in pressure from 50 to 200 or from 200 to 500 MPa approximately doubles the water solubility in haplobasaltic melts. Depending on compositions 2.0-3.0 wt% water can be dissolved at 50 MPa, 3.7-6.1 w1% at 200 Mpa and 7.6-12.4 wt% at 500 MPa. In general, the lowest H20 solubility was found in the An56Di44 melt. At 50 MPa, the variation of water solubility with composition appears to be complex but the precision of the data does not allow to extract reliably compositional trends. In general, data at 200 and 500 MPa show a strong decrease in H2O solubility with increasing Di content, e.g. from 5.99 wt% (Ab100) to 4.94 wt% (Ab54Di46) and from 5.81 wt% (Ab50An50) to 5.21 wt% (Ab27An29Di44) at 1200°C/200 MPa. The effect of Ab/An ratio on water solubility appears to be small at 200 MPa. In contrast, at 500 MPa the water solubility decreases strongly with increasing An content of the melt.
KW - HO speciation
KW - Haplobasaltic melts
KW - IR spectroscopy
KW - Karl-Fischer titration
KW - Water solubility
UR - http://www.scopus.com/inward/record.url?scp=0345099281&partnerID=8YFLogxK
U2 - 10.1127/0935-1221/2003/0015-0803
DO - 10.1127/0935-1221/2003/0015-0803
M3 - Article
AN - SCOPUS:0345099281
VL - 15
SP - 803
EP - 814
JO - European journal of mineralogy
JF - European journal of mineralogy
SN - 0935-1221
IS - 5
ER -