RELATIONSHIP BETWEEN THE ABUNDANCE AND METALLOGENESIS OF GOLD IN PRECAMBRIAN TERRAINS

The granite and strata with high Au abundance have been considered to the source of gold by many geologists.With broad application of the method of neutron activation and chemical-spectral analysis,the accuracy of analysis has greatly improved(up to 0.01×10^-9).A wealth of data shows that the Au abundance of metamorphic rocks in greenstone terrains is rather low(0.17×10^-9 to 2.40×10^-9 in average),and in the relevant granites is only 0.62×10^-9 to 1.20×10^-9 averagely.This concludes that the concept of source rocks or source beds is ambiguous and non-specific.All rocks are possible to perform as source rocks/beds.The mineralization of gold is not related to the Au abundance in granite and strata,but to the metallogenetic mechanism involving gold activation,migration and enrichment.