Other
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.1843p&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 8, pp.1843-1855
Other
4
Scientific paper
Corundum and quartz solubilities in KOH-H 2 O and NaOH-H 2 O solutions were measured at 500-700°C and 2 kbar. The observed solubility increase is interpreted by the formation of neutral alkalialuminum and alkali-silica complexes, with a minor contribution of SiO(OH) 3 - ions; A1(OH) 4 - ions are believed to be practically non-existent at these conditions. The equilibrium constants for these species have been determined, which allows the calculation of their concentration in solutions in the system K 2 O-Al 2 O 3 -SiO 2 -H 2 O for any 3-mineral buffering association. These calculated concentrations were compared to direct composition measurements for solutions experimentally equilibrated with the considered 3-mineral assemblages. The agreement between calculated and measured concentrations is good for alkaline assemblages where the alkali-aluminum complex seems to be the main Al-bearing species with molalities ranging from 0.002 to 0.02. But for common assemblages such as quartz-mica-feldspar, the (K, Na)Al complex molality is negligible (10 -6 to 10 -4 ), whereas the experimental Al-concentrations (10 -3 m) suggest the presence of another Al-bearing species involving both silica and alkalies.
Anderson Malcolm G.
Pascal Marie-Lola
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