抄録
The chemical composition of ferromagnetic component of Kakuto, Ata and Osumi pumice flow tuffs covering the most area of Southern Kyushu, was investigated in relation to their origins. It was found that the combination of weight ratios of Mn/T-Fe+Ti-Zn/T-Fe+Ti was closely related to the origins and highly useful for the identification of these felsic pumice flow tuffs. The great deviation of the combination values of Kakuto samples was due to the plentiful existence of accessory or accidental materials.
