Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 333-347 |
| Seitenumfang | 15 |
| Fachzeitschrift | Chemical Geology |
| Jahrgang | 174 |
| Ausgabenummer | 1-3 |
| Frühes Online-Datum | 23 Feb. 2001 |
| Publikationsstatus | Veröffentlicht - 1 Apr. 2001 |
Abstract
H2O and CO2 solubilities in a natural rhyolite melt (Erevan Dry Fountain (EDF), Armenia) in equilibrium with H2O-CO2 fluids were determined at 200 and 500 MPa and at 800°C and 1100°C. The composition of the fluid phase after experiment was determined by gravimetry, except for extreme CO2-rich fluids for which mass balance was used. Water and CO2 contents of the glasses were measured using IR spectroscopy. At 200 MPa, the water solubility changes from a square root dependence on mole fraction of H2O in the fluid phase (XfH20) at low XfH2O to a linear dependence above XfH2O = 0.25. Up to about 5 wt. % dissolved water in the melt (corresponding to XfH2O ≈ 0.5), a similar trend is observed at 500 MPa. At higher XfH2O, however, the dependence of water solubility on XfH2O is more pronounced than at 200 MPa. A negative temperature dependence of water solubility is observed in the whole experimental range at 200 MPa (e.g. the water solubility at XfH2O =1 decreases from 5.97 to 5.58 wt.% when temperature rises from 800°C to 110°C). In contrast, at 500 MPa the temperature dependence of water solubility changes from positive at high XfH2O (e.g. increase from 9.84 to 11.04 wt.% from a temperature increase from 800 to 1100°C) to negative at low XfH2O. An empirical model to predict water solubility in rhyolitic melts in the P-T range 75-500 MPa and 800-1100°C was derived from our new solubility data and data from Blank et al. (1993). The model reproduces the data at 75 and 200 MPa within ± 2.5% relative and the data at 500 MPa within ± 5% relative. The CO2 solubility shows a non-linear dependence on XfH2O with deviation from linearity, which increases with pressure. The maximum CO2 solubilities (equilibrium with pure CO2) predicted from the data trends are 0.11 ± 0.01 and 0.28 ± 0.03 wt.% at 1100°C and 200 Mpa and 500 MPa, respectively. The temperature dependence of CO2 solubility is found to be almost negligible at 200 MPa and slightly positive at 500 MPa. Our solubility data at 200 MPa are reproduced slightly better by the model of Papale (1999) than by that of Holloway and Blank (1994).
ASJC Scopus Sachgebiete
- Erdkunde und Planetologie (insg.)
- Geologie
- Erdkunde und Planetologie (insg.)
- Geochemie und Petrologie
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in: Chemical Geology, Jahrgang 174, Nr. 1-3, 01.04.2001, S. 333-347.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - The solubility of H2O and CO2 in rhyolitic melts in equilibrium with a mixed CO2-H2O fluid phase
AU - Tamic, Nathalie
AU - Behrens, Harald
AU - Holtz, François
N1 - Funding Information: This study has been supported by the European Community (TMR project ERBFMRX-CT96-0063 G) and the German DFG (project HO 1337/3-1). The authors are grateful to O. Diedrich, A.C. Withers, B. Clemente, C. Rüscher for technical assistance and to B. Schmidt and J. Sowerby for constructive comments. Copyright: Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2001/4/1
Y1 - 2001/4/1
N2 - H2O and CO2 solubilities in a natural rhyolite melt (Erevan Dry Fountain (EDF), Armenia) in equilibrium with H2O-CO2 fluids were determined at 200 and 500 MPa and at 800°C and 1100°C. The composition of the fluid phase after experiment was determined by gravimetry, except for extreme CO2-rich fluids for which mass balance was used. Water and CO2 contents of the glasses were measured using IR spectroscopy. At 200 MPa, the water solubility changes from a square root dependence on mole fraction of H2O in the fluid phase (XfH20) at low XfH2O to a linear dependence above XfH2O = 0.25. Up to about 5 wt. % dissolved water in the melt (corresponding to XfH2O ≈ 0.5), a similar trend is observed at 500 MPa. At higher XfH2O, however, the dependence of water solubility on XfH2O is more pronounced than at 200 MPa. A negative temperature dependence of water solubility is observed in the whole experimental range at 200 MPa (e.g. the water solubility at XfH2O =1 decreases from 5.97 to 5.58 wt.% when temperature rises from 800°C to 110°C). In contrast, at 500 MPa the temperature dependence of water solubility changes from positive at high XfH2O (e.g. increase from 9.84 to 11.04 wt.% from a temperature increase from 800 to 1100°C) to negative at low XfH2O. An empirical model to predict water solubility in rhyolitic melts in the P-T range 75-500 MPa and 800-1100°C was derived from our new solubility data and data from Blank et al. (1993). The model reproduces the data at 75 and 200 MPa within ± 2.5% relative and the data at 500 MPa within ± 5% relative. The CO2 solubility shows a non-linear dependence on XfH2O with deviation from linearity, which increases with pressure. The maximum CO2 solubilities (equilibrium with pure CO2) predicted from the data trends are 0.11 ± 0.01 and 0.28 ± 0.03 wt.% at 1100°C and 200 Mpa and 500 MPa, respectively. The temperature dependence of CO2 solubility is found to be almost negligible at 200 MPa and slightly positive at 500 MPa. Our solubility data at 200 MPa are reproduced slightly better by the model of Papale (1999) than by that of Holloway and Blank (1994).
AB - H2O and CO2 solubilities in a natural rhyolite melt (Erevan Dry Fountain (EDF), Armenia) in equilibrium with H2O-CO2 fluids were determined at 200 and 500 MPa and at 800°C and 1100°C. The composition of the fluid phase after experiment was determined by gravimetry, except for extreme CO2-rich fluids for which mass balance was used. Water and CO2 contents of the glasses were measured using IR spectroscopy. At 200 MPa, the water solubility changes from a square root dependence on mole fraction of H2O in the fluid phase (XfH20) at low XfH2O to a linear dependence above XfH2O = 0.25. Up to about 5 wt. % dissolved water in the melt (corresponding to XfH2O ≈ 0.5), a similar trend is observed at 500 MPa. At higher XfH2O, however, the dependence of water solubility on XfH2O is more pronounced than at 200 MPa. A negative temperature dependence of water solubility is observed in the whole experimental range at 200 MPa (e.g. the water solubility at XfH2O =1 decreases from 5.97 to 5.58 wt.% when temperature rises from 800°C to 110°C). In contrast, at 500 MPa the temperature dependence of water solubility changes from positive at high XfH2O (e.g. increase from 9.84 to 11.04 wt.% from a temperature increase from 800 to 1100°C) to negative at low XfH2O. An empirical model to predict water solubility in rhyolitic melts in the P-T range 75-500 MPa and 800-1100°C was derived from our new solubility data and data from Blank et al. (1993). The model reproduces the data at 75 and 200 MPa within ± 2.5% relative and the data at 500 MPa within ± 5% relative. The CO2 solubility shows a non-linear dependence on XfH2O with deviation from linearity, which increases with pressure. The maximum CO2 solubilities (equilibrium with pure CO2) predicted from the data trends are 0.11 ± 0.01 and 0.28 ± 0.03 wt.% at 1100°C and 200 Mpa and 500 MPa, respectively. The temperature dependence of CO2 solubility is found to be almost negligible at 200 MPa and slightly positive at 500 MPa. Our solubility data at 200 MPa are reproduced slightly better by the model of Papale (1999) than by that of Holloway and Blank (1994).
KW - CO solubility
KW - Infrared spectroscopy
KW - Mixed fluid
KW - Rhyolitic melt
KW - Water solubility
UR - http://www.scopus.com/inward/record.url?scp=0035088931&partnerID=8YFLogxK
U2 - 10.1016/S0009-2541(00)00324-7
DO - 10.1016/S0009-2541(00)00324-7
M3 - Article
AN - SCOPUS:0035088931
VL - 174
SP - 333
EP - 347
JO - Chemical Geology
JF - Chemical Geology
SN - 0009-2541
IS - 1-3
ER -