火山
Online ISSN : 2189-7182
Print ISSN : 0453-4360
ISSN-L : 0453-4360
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下北半島,於法岳火山の岩石記載とK-Ar年代
安住 亜友美梅田 浩司柴 正敏佐々木 実佐藤 大紀
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2019 年 64 巻 3 号 p. 169-174

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Oho-dake volcano, situated at the central part of the Shimokita peninsula, Northeast Japan, is a small Quaternary composite volcano consisting of coexisting tholeiitic and calc-alkaline andesitic to dacitic lavas and pyroclastic flow deposits. Two K-Ar ages (1.99±0.08Ma and 2.03±0.08Ma) were obtained from the uppermost part and lower part of lava flows, which overlap within the estimated errors. Small volume eruptions of Oho-dake volcano are consistent with small and short-lived magma batches within the magma plumbing system.

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