Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 1234-1240 |
| Seitenumfang | 7 |
| Fachzeitschrift | American Mineralogist |
| Jahrgang | 97 |
| Ausgabenummer | 7 |
| Publikationsstatus | Veröffentlicht - 1 Juli 2012 |
Abstract
Crystallization experiments were conducted at 200 MPa to determine the effect of small amounts of H 2O on the liquidus temperature of basaltic melts in which plagioclase is the liquidus phase. The H 2O concentrations in the quenched glasses, determined by infrared spectroscopy and Karl-Fischer titration, ranged from 0.02 to 4.2 wt% H 2O. The dry liquidus temperature at 200 MPa was estimated from experiments at 1 atm (H 2O-free) and from the known pressure dependence of plagioclase crystallization temperature. The effect of water (expressed as wt% H 2O) on the plagioclase liquidus temperature is nonlinear and diminishing with increasing melt H 2O concentrations. According to our new experimental data, it can be empirically predicted with following equation: (T DRY-T WET) = 76.99C H2O 0.71 where CH 2O is the water concentration in the melt (wt%), T DRY, and T WET are plagioclase crystallization temperatures in water-free and water-bearing systems, respectively. The relationship between CH 2O and liquidus temperature worked out in this study is valid for a range of basaltic compositions, ranging from high-alumina basalts to basaltic andesites. The combination of the empirical equation predicting the liquidus depression of plagioclase with previous models predicting the olivine liquidus curve is useful to determine the liquidus temperature in various H 2O-bearing basaltic systems in which either plagioclase or olivine is the liquidus phase.
ASJC Scopus Sachgebiete
- Erdkunde und Planetologie (insg.)
- Geophysik
- Erdkunde und Planetologie (insg.)
- Geochemie und Petrologie
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in: American Mineralogist, Jahrgang 97, Nr. 7, 01.07.2012, S. 1234-1240.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Experimental calibration of the effect of H 2O on plagioclase crystallization in basaltic melt at 200 MPa
AU - Almeev, Renat R.
AU - Holtz, François
AU - Koepke, Jürgen
AU - Parat, Fleurice
N1 - Copyright: Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012/7/1
Y1 - 2012/7/1
N2 - Crystallization experiments were conducted at 200 MPa to determine the effect of small amounts of H 2O on the liquidus temperature of basaltic melts in which plagioclase is the liquidus phase. The H 2O concentrations in the quenched glasses, determined by infrared spectroscopy and Karl-Fischer titration, ranged from 0.02 to 4.2 wt% H 2O. The dry liquidus temperature at 200 MPa was estimated from experiments at 1 atm (H 2O-free) and from the known pressure dependence of plagioclase crystallization temperature. The effect of water (expressed as wt% H 2O) on the plagioclase liquidus temperature is nonlinear and diminishing with increasing melt H 2O concentrations. According to our new experimental data, it can be empirically predicted with following equation: (T DRY-T WET) = 76.99C H2O 0.71 where CH 2O is the water concentration in the melt (wt%), T DRY, and T WET are plagioclase crystallization temperatures in water-free and water-bearing systems, respectively. The relationship between CH 2O and liquidus temperature worked out in this study is valid for a range of basaltic compositions, ranging from high-alumina basalts to basaltic andesites. The combination of the empirical equation predicting the liquidus depression of plagioclase with previous models predicting the olivine liquidus curve is useful to determine the liquidus temperature in various H 2O-bearing basaltic systems in which either plagioclase or olivine is the liquidus phase.
AB - Crystallization experiments were conducted at 200 MPa to determine the effect of small amounts of H 2O on the liquidus temperature of basaltic melts in which plagioclase is the liquidus phase. The H 2O concentrations in the quenched glasses, determined by infrared spectroscopy and Karl-Fischer titration, ranged from 0.02 to 4.2 wt% H 2O. The dry liquidus temperature at 200 MPa was estimated from experiments at 1 atm (H 2O-free) and from the known pressure dependence of plagioclase crystallization temperature. The effect of water (expressed as wt% H 2O) on the plagioclase liquidus temperature is nonlinear and diminishing with increasing melt H 2O concentrations. According to our new experimental data, it can be empirically predicted with following equation: (T DRY-T WET) = 76.99C H2O 0.71 where CH 2O is the water concentration in the melt (wt%), T DRY, and T WET are plagioclase crystallization temperatures in water-free and water-bearing systems, respectively. The relationship between CH 2O and liquidus temperature worked out in this study is valid for a range of basaltic compositions, ranging from high-alumina basalts to basaltic andesites. The combination of the empirical equation predicting the liquidus depression of plagioclase with previous models predicting the olivine liquidus curve is useful to determine the liquidus temperature in various H 2O-bearing basaltic systems in which either plagioclase or olivine is the liquidus phase.
KW - Crystallization
KW - FTIR
KW - H O
KW - KFT
KW - Liquidus
KW - MORB
KW - Plagioclase
UR - http://www.scopus.com/inward/record.url?scp=84864856148&partnerID=8YFLogxK
U2 - 10.2138/am.2012.4100
DO - 10.2138/am.2012.4100
M3 - Article
AN - SCOPUS:84864856148
VL - 97
SP - 1234
EP - 1240
JO - American Mineralogist
JF - American Mineralogist
SN - 0003-004X
IS - 7
ER -