PROBLEMS AND SOLUSION OF AGE DETERMINATION OF GOLD DEPOSITS

Age determination precision of gold deposits has greatly improved, but certain problems still remain, such as different understanding for metallogenetic epoch of gold deposits, and draw back of isotopic dating method.The metallogenetic epoch of gold deposits is the time when Au elements significantly gather.In fact, the ore-forming of a certain gold deposit is commonly longer than a metallogenetic epoch.Age determination of gold deposits is relatively difficult.The dates of isotope system dating include forming age of auriferous formation and metallization phase. On the basis of ore-forming geological setting and geochemical research of deposits, the newly isotopic dating methods of hydrothermal alteration minerals, fluid inclusion, vein quartz, hydrothermal zircon and Re-Os system, and synthetic analy sis of multi-isotope system are the main direction of age dating method of gold deposits in the future. Re-Os isotopic system is the one that can be widely applied to ores to date ore-forming directly, and that trace the source and subsequent history of auriferous formation and metallization fluids with the ¹⁸⁷Os/¹⁸⁸Os value.Therefore, it is playing an increasing lyimprotant role in age dating and study of gold deposits.