Study of genetic relationship between dikes and gold orebodies in Kubusu gold deposit in east Junggar.
工准噶尔库布苏金矿床岩脉与金矿成因关系的研究

The three ore belts of Kubusu gold deposit all were preduced in dikes of diorite porphyrite and granodiorite porphyry. To study genetic relationship between these dikes and gold orebodies, we determined the homogenization temperature, composition, salinity and hydrogen oxygen isotope of H 2O of fluid inclusions in quartz of gold bearing quartz vein, REE and trace elements of gold bearing quartz vein and rock of correlative dikes and country rock are detemined. It is found that, the fluid inclusions in quartz is reductive fluid with higher homogenization temperature, lower salinity and CO 2 rich and its cationic assemblage type is Ca 2 >Na >K or Na >K >Mg 2 , anionic assemblage type is Cl ->SO 4 2- >F -, having features of metamorphic fluid. The REE patterns and assemblage signature of trace elements of gold bearing quartz vein and dike rock are prominetly different, indicating that the gold bearting quartz veins have no relation to these dikes in composition. Therefore, we inferred from these analytical results and geologic characteristics of deposit: the rise of magma formed these dikes and ore forming fluid are controlled by same structure and dike rock is brittler relative to their wall rocks, that are essential cause of close space relationship between dikes and gold orebodies.