Abstract
Oze-Hiuchigatake is a Quaternary composite volcano (<8km3) in northern Kanto, and marks the western end of Nasu volcanic belt. Four stages of activities were found. (Stage I) Development of a small stratovolcano on the southern part. Effusions of thin andesitic lava flows and intermediate pyroclastic flows intercalated with pumice flows. (Stage II) Formation of Lake Ozegahara as a result of pumiceous pyroclastic flows. Growth of a composite volcano by 16 andesitic lava flows. (Stage III) Flank eruptions of thick (<120m) andesite to dacite lava flows and minor pyroclastic flows. (Stage IV) Effusions of thick dacitic lava flows and growth of three small lava domes at the summit. Collapse of the volcano by debris avalanche on its southwestern foot. Formation of Oze Marsh after the old Nushiri valley was dammed up.
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