⁸⁷Sr/⁸⁶Sr Ratios of Volcanic Products of the 1983 Eruption of Miyake-jima Volcano

Abstract

⁸⁷Sr/⁸⁶Sr ratios were determined for 5 volcanic products (3 lava, 1 scoria and 1 xenolith samples) of the 1983 eruption of Miyakejima volcano. The rations were all within the range between 0.70350 and 0.70361, which agrees with those of older volcanic rocks (0.70351-0.70369 ; NOTSU et al., 1983). This suggests that the source material of Miyakejima volcano has not changed significantly since older stages till the 1983 eruption.