Trace Element Concentrations of Manganese Deposits in the Tokoro Belt, Hokkaido, Japan

X-ray fluorescence (XRF) analytical methods have been developed to determine Mn, Fe, Cr, Co, Cu, Ni, Zn, Ba, and Pb contents in manganese ores. Standards were prepared from 7 reference samples analyzed by ICP and synthetic samples because the silicate standard samples of GSJ can not be used to analyze the manganese ores. Pellets were prepared by mixing 2.5g of samples and 3.5cc polyvinyl alcohol solution, and were subjected to a pressure of 5,000kg per square cm. Brief geochemical interpretation shows that manganese deposits in the Tokoro Belt have been considered to be formed by submarine hydrothermal activity. Trace elements of the manganese ores are of two distinct types: one type has rather high chemical concentrations such as hydrogenous deposits (deep-sea ferromanganese nodules), the other has low concentrations which is similar to those of submarine hydrothermal deposits. These compositional trends of manganese deposits in the Tokoro Belt is considered as a reflection of a submarine hydrothermal origin with limited hydrogenetic effects on the deposits