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The dissolution rates of natural glasses as a function of their composition at pH 4 and 10.6, and temperatures from 25 to 74°C |
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| Authors: | Domenik Wolff-Boenisch Sigurdur R Gislason Christine V Putnis |
| Institution: | 1 Science Institute, University of Iceland, Dunhagi 3, 107 Reykjavik, Iceland. 2 Géochimie: Transferts et Mécanismes, CNRS/UMR 5563-Université Paul Sabatier, 38 rue des Trente-six Ponts, 31400 Toulouse, France. 3 Institut für Mineralogie, Westfälische Wilhelms-Universität, Corrensstr. 24, 48149 Münster, Germany. |
| Abstract: | Far-from-equilibrium dissolution rates of a suite of volcanic glasses that range from basaltic to rhyolitic in composition were measured in mixed flow reactors at pH 4 and 10.6, and temperatures from 25 to 74°C. Experiments performed on glasses of similar composition suggest that dissolution rates are more closely proportional to geometric surface areas than their BET surface areas. Measured geometric surface area normalized dissolution rates (r+,geo) at 25°C were found to vary exponentially with the silica content of the glasses. For pH 4 solutions this relation is given by:
(A1) |
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