摘要
对金矿床测年研究近年来取得了很大进展 ,但也有诸如对金矿床成矿时代认识存在的差异及测试方法本身具有局限性的问题 .应当重新理解金成矿时代的概念 ,注重新的测年方法的使用 ,尽可能开展多元同位素体系测年工作 .
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 drawback 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 analysis 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 187 Os/ 188 Os value Therefore,it is playing an increasingly improtant role in age dating and study of gold deposits
关键词
测年
金矿床
成矿时代
age determination
gold deposit
metallogenetic epoch
