GEOLOGICAL CHARACTERISTICS OF SOME GOLD DEPOSITS RELATED TO DUCTILE SHEAR ZONE

Now, more and more gold deposits occouring in ductile shear zone have been found in the world. According to the relation ship between main ore-foming stage and ductile shear zone, gold deposits are classified into synductile shear type and gold deposit of post ductile shear type. The main ore-foming stage of the gold deposits of synductile shear type is syn-chronous with the happening and formation of gold -bearing ductile shear zone. The ductile shearing activity not only provides places for ore deposits, but also is related directly with metallogenesis. the host wall rocks are ultramy-lonite, mylonite and protomylonite etc. Ore body is outlined by chemical analysis and the ores is mainly of disseminated type. The ore-foming stage of the gold deposits of post ductile shear type is obviously later than ductile shear deformation with a large interval. The type of ores is controlled by deformation charac-teristics of ore-bearing zone.