ABSTRACT
Based on systematic observation and synthetic analysis of mylonites formed at different depths three categories of mylonites have been classified, they are shallow level mylonite with cataclastic rheological deformation (type B), medium-deep level mylonite with ductile-slip rheological deformation (type D), and deep level mylonite with viscous rheological deformation (type V). The type B has been called cooling mylonite not only because of its shallow structure level, but also its low temperature of formation(<250°C–300°C). Type B mylonites have obvious characteristics compared with types D and V, such as semipenetrative lineation, foliation and fabric, special substructure and dislocation, light colour stress minerals and the semi-reduction condition forming. Finally it is shown that an ordered texture of the cooling mylonite can be caused through the dynainometamorphism, and this mylonite is closely corresponding with the strata-bound ore deposit in southeastern China
