Other
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.4831m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 58, Issue 22, pp.4831-4839
Other
35
Scientific paper
The solubility of quartz in H 2 O has been determined experimentally from 5 to 20 kb and 500 to 900°C. The results double the pressure range over which the molality of aqueous silica ( m SiO 2( aq ) ) has been determined and lead to more accurate estimates of quartz solubility in H 2 O below 5 kb because of the rapid-quench methods employed. At constant temperature, log m SiO 2( aq ) increases with increasing pressure and ( log m SiO 2( aq ) / t 6 P ) T decreases with increasing pressure. Comparison of the new data with previous low-pressure experiments demonstrates that isothermal values of log m SiO 2( aq ) increase linearly with increasing log m H 2 O between 200 and 900°C. This observation was used to derive the following expression for the equilibrium constant ( K ) of the reaction QUARTZ = SiO 2(aq) where log K = log m SiO 2( aq ) . The equation agrees well with previous results, while accurately reproducing measured quartz solubilities over a much wider range in pressure and temperature, from 25°C and 1 bar to the conditions of this study. If the isothermal variation of log mSiO 2( aq ) with log H 2 O is assumed to be linear, the results can be extrapolated to > 20 kb. The equation allows evaluation of aqueous silica transport in Barrovian metamorphic belts, subduction zones, and metasomatized magma source-regions in the mantle.
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