Аннотация
Mathematical expressions for the time of growth of spherical post-depositional concretions from flowing and non-flowing supersaturated ground water are derived based on ionic diffusion as the rate-controlling growth mechanism. The theoretical treatment is that used by (1950) and (1961) for physically analogous problems. Application of the equations to the growth of CaCO 3 concretions is done in the form of growth curves for different ground water flow rates. For a typical slowly flowing ground water supersaturated in CaCO 3 by 10 ppm the time of growth of calcite concretions ranges from ~500 yr for concretions of 1 cm radius to ~12,000 yr for those of 5 cm radius.
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