Other
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40.1509p&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 40, Issue 12, pp.1509-1521
Other
8
Scientific paper
The ability of precipitates formed during incongruent dissolution of feldspars in aqueous solutions to act as barriers to mass transfer between the feldspar and the bulk solution is examined using the available textural evidence on such precipitates. The propensity of precipitates for forming compact coatings on the dissolving grains is measured by a characteristic distance of diffusion of the precipitating component, a function of the diffusion coefficient of the component in solution and of the rate constant for its precipitation. The available evidence on precipitates formed during dissolution of feldspars, complemented by the evidence on similar precipitates produced from comparable solutions in the absence of feldspars, is sufficient for evaluating the protective effect of precipitates under laboratory conditions, and for setting limits to the conditions under which such an effect could be important during weathering and diagenesis. Feldspar dissolution in the reported kinetic experiments at room temperature and 3 pH 10 could not have been controlled by diffusion through the precipitate, and changes in the rate of release of alkalies after the first couple of days in Lagache's experiments at 200°C also could not have been controlled by diffusion through the precipitate. Other things being equal, characteristic distances of diffusion of components reprecipitated during incongruent dissolution of silicates decrease with increasing temperature, and coating of dissolving grains by compact precipitate layers should be more common at metamorphic temperatures than in the temperature range of weathering and diagenesis.
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