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Geochemical characteristics of the Upper Archean-Lower Proterozoic Jiaodong Group——the hostrocks of the famous Jiaodong gold deposit are described in this paper.it is shown that the Jiaodong Groupis an important Au-bearing formation containing 19.5 ppb Au on average,about 5 times as much the abun-dance in the crust.It is also found that the distribution of gold in the strata is uneven and that plagioclaseamphibolite is the prospective Au-bearing rock.In the processes of regional metamorphism,migmatizationand fault-remelting,gold in the source bed was remobilized and concentrated to form various types of golddeposits in this province.
Geochemical characteristics of the Upper Archean-Lower Proterozoic Jiaodong Group - the hostrocks of the famous Jiaodong gold deposit are described in this paper. It shows that the Jiaodong Group an an Au-bearing formation contains 19.5 ppb Au on average, about 5 times as much the abun-dance in the crust. It is also found that the distribution of gold in the strata is uneven and that plagioclase ramphib is the prospective Au-bearing rock. the processes of regional metamorphism, migmatization and fault-remelting, gold in the source bed was remobilized and concentrated to form various types of golddeposits in this province.