Computer Science
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40...41b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 40, Issue 1, pp.41-49
Computer Science
23
Scientific paper
The dissolution kinetics of 5% by weight suspensions of two potassium feldspars and six plagioclases were studied for 400-1200 hr at 1 atm P CO 2 The less than 37 m particles had surface areas ranging from 0.83 to 1.84 m 2 /g. At frequent intervals, the pH of the stirred suspensions were measured in the reaction cell as the solutions were sampled. The filtered aqueous samples were acidified and then were analyzed for Si, Al, K, Na, Ca, Mg, and Fe. The following sequence of events were recognized in the artificial weathering of all the feldspars: 1. (1) an initial ion exchange stage lasting approximately l min during which the surface cations were replaced by hydrogen ions from the bulk solution, 2. (2) an up to 4 day non-parabolic stage characterized by the very rapid release of cations and silicic acid into the bulk solution, 3. (3) a diffusion-controlled parabolic stage lasting approximately 19 days, and 4. (4) a steady-state stage characterized by the very slow release of cations and silicic acid. All the rate constants for all the feldspars were evaluated at the pH of about 5. 5. The calculated parabolic rate constants range from 3.4 × 10 -14 to 9.3 × 10 -13 mole/cm 2 /sec 1/2 , the linear rate constants range from 3.2 × 10 -17 to 2.5 × 10 -15 mole/cm 2 /sec, and the apparent diffusion coefficients range from 1 × 10 -22 to 5 × 10 -21 cm 2 /sec. The steady-state composition of the surface layer of all the plagioclases appears to have a 1:1 Si: Al molecular ratio, whereas in contrast, the potassium feldspars appear to have a 2:1 ratio.
Busenberg Eurybiades
Clemency Charles V.
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