CHARACTERISTICS AND ORIGIN OF GREENSTONE BELT TYPE GOLD DEPOSITS IN WESTERN SHANDONG

With relatively high total gold background values,the strata of the greenstone belt in western Shandong are source beds of gold deposit.Both the well-preserved greenstone belt and TTG-reworked granite-greenstone belt are favorable for gold deposit formation.The formation and distribution of the known gold deposits are both related to ductile shear belts,which are major ore-controlling structure of greenstone type gold deposits.The TTG series,which have experienced strong ductile deformation and fragmentation and contain rich greenstone belt remnants,have close relation with gold deposit formation.Superimposition of Mesozoic Yanshanian magmatic-hydrothermal activities favorable for further gold concentration and mineralization.