Sr/Ca-Ba/Ca systematics of Quaternary volcanoes in Toshima, Udonejima, Niijima and Kozushima,

Ca, Sr and Ba contents in various volcanic rocks (basalts, andesites, rhyolites and their cognate inclusions) from Quaternary volcanoes in Toshima, Udonejima, Niijima and Kozushima, the Izu Islands, Japan, have been determined by an ICP-OES method. Basalts and andesites from Toshima and Niijima make two different series of Sr/Ca-Ba/Ca systematics (SB..