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Abstract
This note represents cathodoluminescence (CL) images, obtained using a scanning electron microscope, of a low-temperature granitic mylonite from central Japan. It is argued that CL observations offer a simple but powerful tool for elucidating the importance of solution-transfer processes during mylonitization. Cataclastic deformation such as fracturing of feldspars, accompanied by solution-precipitation processes, were found to be much more clearly observable in CL images than using other techniques. It is also shown that quartz grains precipitated from solution can be distinguished from original quartz grains in the granite, even after being deformed plastically. More detailed CL work on mylonites is needed in the future, since quantitative evaluation of the role of solution-precipitation processes in deep fault zones is essential for constraining the rheological properties of faults at depth.
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