2:30 PM - 2:45 PM
[MIS07-09] Observation of the dissolution/growth process of carbonate minerals by the visualization technique with the fluorescent probe
Keywords:dissolution process, visualization, carbonate minerals
When calcite and aragonite dissolve in water, pH just above the surfaces increases rapidly and saturates at slightly higher value than the equilibrium pH. Distribution of pH follows the outer shape of crystals soon after the dissolution starts, and the preferential dissolution from the edge does not occur. On the other hand, in the case of dolomite, pH change is considerably slow and two dimensional feature of pH change during the dissolution is different from those of two CaCO3 polymorphs. These kinds of tendency should strongly depend on the surface condition, such as the density of the dissolution sites (dislocations, etch pits, and so on). By combining this technique with detail observation of surface structure, new insights could be provided into the dissolution/growth mechanism of minerals.