Abstract
The chemical composition of surface layers on calcite and an overgrowth on dolomite which proved to be calcitic have been determined in solutions of varying amounts of Mg 2+. It is demonstrated from the results that an apparent equilibrium between surface layers of the carbonates and solution is reached. Ca 2+ self diffusion and Na + diffusion coefficients in calcite were determined in order to study the ion mobility in the lattice. These D values suggest that cation replacement does not change the chemical composition of calcite to an appreciable extent. Thus, if recrystallization is absent, equilibrium between solid and solution is approached only at the surface layers or in the overgrowth. The bulk of solid might stay even on a geological time scale.
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