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Tarumai Volcano started a series of historic eruptive activity in AD 1667 after a dormancy of approximately 2000years. The historic juvenile ejecta are mainly silicic andesite pumice associated with scoria, banded pumice and dome lava (SiO 2 =55–63%), and are mixing products of two or three end-member magmas. In the initial largest plinian eruptions (AD 1667 period), simple mixing between...