ORE-CONTROL ACTION OF DUCTILE SHEAR BELT WITHIN SLATE ZONE ON GOLD DEPOSIT ON THE SOUTHERN MARGIN OF YANGTZE PLATFORM

Three genetic types of gold deposit are discerned in the shear belt within the slate zone on the southern margin of Yangtze platform as follows; mylonitic, quartz vein and altered rock types. Gold deposit is obviously controlled by the shear belt. Ore bodies depend mainly on the following structures; multi-order structures of first to fouth orders made up of ductile and brittle-ductile shear belts or brittle faults; structural deformation areas, including dilatio areas of the top of arc shear belt and the conjoining areas of shear belts; areas of strong structural strain and their superimposition composed of ultramylonite, mylonite,; and cataclasite; multideformed areas. Dynamic model of gold deposit is established in the slate shear belts. Four stages of gold deposit are discerned as follows:the formation of background rock, movement of ore-forming materials, major dynamic mineralization and the reworking and reconstruction of the deposits.