Instrumental neutron activation analysis of 13 trace elements in volcanic rocks

13 trace elements; Co, Cr, Sc, Ba, Th, Hf, La, Ce, Sm, Eu, Tb, Yb and Lu in some volcanic rocks from an island arc, an oceanic island and a mid-oceanic ridge areas were determined by a simple method of non-destructive neutron activation analysis. The abundances of Cr, Ba, Hf and rare-earth elements (REE) seem to be able to give the significant informations on the mechanism of magma generation at the above areas. (auth.)