[ Top ] [ Japanese ]

Minami-Hakkoda 1st-stage Lava and Pyroclastic Rocks (Muraoka and Takakura, 1988) Takarada and Muraoka, 2004

Invalid synonym: Minami-Hakkoda 1st-stage Lava

• Type locality: 530 m above sea level of Okogawa creek - Aoni creek, Kuroishi city, Aomori prefecture
• Pre-caldera volcanoes
• Volcanic rocks
• Pleistocene (ca. 1.1 - 0.8 Ma, K-Ar)

• Lithofacies: Basalt - Basaltic andesite
• Lithofacies: Aa lava (8 sheets or more)

• Thickness: 200 - 300 m
• Thickness (A sheet): several - 10 m
• Upper limit: Unconformity (Okogawazawa Debris Flow Deposit, Minami-Hakkoda 2nd-stage Lava and Pyroclastic Rocks, Komagamine Lava, Komagamine Pyroclastic Rocks)
• Lower limit: Unconformity (Aoni Tuff)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Okogawa creek - Aoni creek, Kuroishi city, Aomori pref.; Tokusamori, Kuzukawa, Hirakawa city, Aomori pref.; Mount Kushigamine, Hirakawa city, Aomori pref.; Mount Minamizawa - Mount Yokodake, Kuroishi city, Aomori pref.

• Takarada and Muraoka (2004) Geology of the Hakkoda San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 86p. (in Japanese with English abstract 4p.)