THE GEOLOGICAL CONDITIONS OF FORMATION AND MINERALIZATION FEATURES OF MICRO-FINE DISSEMINATED GOLD DEPOSITS IN CHINA

Micro-fine disseminated gold deposit is one of the most important hydrothermal deposit types in China. Most of them are spatially distributed in regions around the Yangtze platform,and their occurences are controlled by strata,structure and certain thermodynamic conditions in addition to tectonic backgrounds.The mineralization features of this type of gold deposits are as follows:①gold mineralization is distributed extensively in space,but the deposits are usually smaller in scale relatively; ②regionally,gold mineralization often occurred in accompanion with low temperature hydrothermal deposits of Sb,As,Hg,U etc.; ③the formation of the gold deposits experienced multiphases as well as polystages of mineralizing processes,and their origins are usually different and complex;and ④the main metallogenic period is from late Indo-Chinese epoch to Yanshanian epoch.