Computer Science
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.2431w&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 57, Issue 11, pp.2431-2437
Computer Science
3
Scientific paper
The concentrations of K, Na, Al, and Si in pure H 2 O in equilibrium with natural microcline, muscovite, and quartz have been measured between 400 and 600°C at 2 kbar with an extraction-quench apparatus. Silicon is the dominant solute in solution, and its concentration is similar to those reported for quartz solubility in pure H 2 O: increasing from 0.05 molal at 400°C to 0.12 molal at 600°C. The small amount of Na in the microcline and muscovite was rapidly leached from the mineral surface into solution so that the initial log molality of Na equaled -2.7 but decreased as pure H 4 O was injected into the charge volume. Log molalities of K in equilibrium with the mineral assemblage are between -3.0 and -2.7. The calculated solution compositions are basic, and Al(OH) 4 - is determined to be the dominant Al species in solution. These calculations suggest that both Al(OH) 3 0 and A1(OH) 4 - contribute significantly to the solubility of corundum in pure H 2 O at these temperatures and 2 kbar. The logarithm of the equilibrium constant for Al ( OH ) 3 0 + H 2 O = Al ( OH ) 4 - + H + is computed to be -4.1, -5.4, and -6.1 at 2 kbar and 400, 500, and 600°C, respectively. No evidence exists for the formation of significant concentrations of alkali-Al complexes despite the fact that Al concentrations in pure H 2 O for microcline + muscovite + quartz are an order of magnitude greater than those reported for corundum solubility at the same pressure and temperature.
Walther John V.
Woodland Alan B.
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