Computer Science
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51..365w&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 51, Issue 2, pp.365-372
Computer Science
6
Scientific paper
The concentrations of Na, Al, and Si in an aqueous fluid in equilibrium with natural albite, paragonite, and quartz have been measured between 350°C and 500°C and 1 to 2.5 kbar. Si is the dominant solute in solution and is near values reported for quartz solubility in pure H 2 O. At 1 kbar the concentrations of Na and Al remain fairly constant from 350°C to 425°C but then decrease at 450°C. At 2 kbar, Na increases slightly with increasing temperature while Al remains nearly constant. Concentrations of Si, Na, and Al all increase with increasing pressure at constant temperature. The molality of Al is close to that of Na and is nearly a log unit greater than calculated molalities assuming Al(OH) 0 3 is the dominant Al species. This indicates a Na-Al complex is the dominant Al species in solution as shown by and (1983) at higher temperature and pressure. The complex can be written as NaAl ( OH ) 0 4 ± nSiO 2 where n is the number of Si atoms in the complex. The value of n is not well constrained but appears to be less than or equal to 3. The results indicate Al can be readily transported in pure H 2 O solutions at temperatures and pressures as low as 350°C and 1 kbar.
Walther John V.
Woodland Alan B.
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