Abstract
Observation was made with rhyolitic volcanic rocks erupted from Kozu-shima, Niijima and Higashi-Izu monogenetic volcano group for activity ratios of 230Th/238U. While the activity ratios of basaltic products from Izu arc showed 230Th/238U<1, the majority of rhyolitic products was in radioactive equilibrium, suggesting that the addition of fluid for rhyolitic magma from subducting slab was less significant than for basaltic magma at the magma genesis. Separate distribution of(230Th/232Th)-(238U/232Th)activity ratios of the rhyolite group from those of the basalt group indicated that the rhyolite of Izu arc might not have genetic relation to the basaltic magma from Izu arc volcanoes.
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