摘要
系统的地层地球化学研究结果确定了在胶东半岛存在有重要的含金建造—上太古界至下元古界胶东群。该建造起源于地槽发育早期的基性火山活动。通过区域变质作用、混合岩化作用和断裂重熔岩浆作用,原始地层中的金活化转移,形成各种类型的金矿床。
Geochemical characteristics of the Upper Archean-Lower Proterozoic Jiaodong Group-the host rocks of the famous Jiaodong gold deposit are presented in this paper. It is shown that the Jiaodong Group is an important Au-bearing formation containing 19.5 ppb Au on average, about 5 times as much as its abundance in the crust. It is also found that the distri-bution of gold in the strata is uneven and that plagio-hornblendite is the prospective Au-bearing rock. In the processes of regional metamorphism, migmatization and fault-remelting gold in the source bed was remobilized and concentrated to form various types of gold de-posits in this area.
出处
《地球化学》
CAS
1988年第3期195-208,共14页
Geochimica
