Abstract
Atomic force microscope (AFM) observation and analysis of Izumiyama hydrothermal illite (the weaker al- tered illite-kaolinite zone (IZ-1) and the higher altered illite zone (IZ-2)) were performed to understand the crystal growth mechanism and the relation between morphology and polytype of the illites. Our AFM results suggest that growth of the Izumiyama illite was controlled by a mechanism of solution-mediated polytype and spiral-type transformations, based on the Ostwald ripening process. The sequential variations could follow the changes in supersaturation and/or temperature of the solution. The paths of the thermal and supersaturation condition changes of the hydrothermal solutions for the two samples were estimated from the saturation state of the solution, which was evaluated by the step separation, polytype and mineral assemblage of the samples.
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