In order to understand the origin of metal spherical minerals in the Okinawa Trough sediments, the authors have microscopically examined 215 samples (161 surfac
This paper describes in detail the method of separating Rb and Sr from black shale samples by using cation exchange resin 71-616×20, experimental condition
Among various factors governing the formation of tungsten ore deposits, the stratigraphic condition is considered as an important one. The formation of tungsten
Based on the data on plagioclase number of granitoids and whole.rock chemical analysis the author has proposed that the percentage of molecules of albite in the