In Water-Rock Interaction: Proceedings of the Tenth International Symposium on Water-Rock Interaction, R. Cidu, ed., pp. 309-312.

A. A. Balkema, Lisse, Netherlands (2001)

Solubility of Na, Al, and Si in aqueous fluid at 0.8-2.0 GPa and 1000-1300°C

Mysen, Bjorn O.

Geophysical Laboratory,
5251 Broad Branch Rd., NW
Washington DC 20015-1305, USA

Abstract

The silicate solubility in aqueous fluid in melt+fluid systems with 80 mol % SiO2, 20-14 mol % Na2O, and 0-6 mol % Al2O3 at 0.8-2.0 GPa and 1000°-1300°C is in the 3-20 mol% range with a positive temperature- and pressure-dependence. The solution behavior in aqueous fluid is incongruent. The partition coefficient, Doxidefluid/melt, ranges between 0.02 and 0.5 for Na2O, 0.01 and 0.2 for Al2O3, and 0.01 and 0.4 for SiO2, and increases linearly with increasing oxide content of the fluid (decreases with oxide content in the melt). Partial molar volume of H2O in the silicate-saturated fluids, H2Ofluid, is in the range 17-25 cm3/mol. Compared with the molar volume of pure H2O, V°H2O, the H2Ofluid values are 10-15 % lower at 0.8 GPa and as much as 15 % higher than V°H2O at 2.0 GPa. This volume difference diminishes as the system become more aluminous.

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[1], [2], [3], [4],
[5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16], [17], [18],
[19], [20], [21], [22], [23], [24], [25]

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Copyright 2002, Geophysical Laboratory, Washington, DC.
http://gl.ciw.edu. June 2002

Email: mysen@gl.ciw.edu