Other
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.3181m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 55, Issue 11, pp.3181-3189
Other
5
Scientific paper
Specimens of labradorite feldspar ( An 54) were dissolved in mildly acidic solutions containing the cations Al, Ca, and Mg at 9.3 × 10 -3 , 1.9 × 10 -2 , and 3.7 × 10 -2 mmol · gL -1 for 72 days at 21 ± 2° C and atmospheric pressure. Depth profiles by secondary ion mass spectrometry (SIMS) show that the extent to which altered layers form on dissolving labradorite can be influenced by the cation concentration of the leachant solutions. Silicon-enriched altered layers 1500 Å thick form on labradorite surfaces [(001) cleavage faces]during dissolution in aqueous HCl (pH 4). Addition of dissolved Al, Ca, and Mg to the leachant solution reduces the thickness of the altered layers. The formation of thinner altered layers may result from competition between cations and H ions for active surface sites such that the supply of H ions to the labradorite surface is reduced. Dissolved Al in the leachant solutions also alters the release rates of Ca and Al relative to one another. On the other hand, the same is not observed for labradorite specimens dissolved in solutions containing Ca (aq) . The results from these experiments also support a diffusion-limited process for the release of Al from fresh labradorite to solutions containing Al (aq) . Previous attention has been focused on the effects of organic ligands; however, the results demonstrate the important role dissolved cations play in the dissolution of aluminosilicates.
Muir Ian J.
Nesbitt Wayne H.
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