Phyllonite was formed by a deformation at low temperatures and the fine-graded sericite in it was new-born syn-deformational mineral, therefore the sericite ~(40)Ar-~(39)Ar age can represent the deformation time very well.

Ore potentiality analysis of mylonite zone of Hetai gold mine field;

Analysis of porous media based on the mixed radius model for the study of mylonite;

A meso-damage mechanical model of mylonite formation;

Analysis of the mylonite crystal porous mold by the finite element method;

Considering the regional geological background and its evolution history, it is said that greenstone type gold deposit has two types as mylonite type and quartz-vein type, and it belongs to multi-sources .

It is considered that the mylonitized alkaline granite is of sedimentary-metamorphic genesis in view of the following facts: bedding is exhibited in the rocks, before mylonitization the rocks had granoblastic texture and rock-forming minerals such as natro-griinerite, which reflect region metamorphic genesis, and the zircons.

The mylonitization occurred in about 353- 370Ma ago with the temperature ranging from 425℃ to475℃ and pressure 3.

Here,we report a field study of mylonitization and intensive sericitization impacts on zircons from the Fangcheng syenites.