Nakadake Porphyrite

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Nakadake Porphyrite Kawachi, 1977

Type locality: Mount Nakadake, Chino city - Hara city, Suwa county, Nagano prefecture
Center part of a volcanic vent of a volcano
Volcanic rocks
Pleistocene (1.3? Ma, K-Ar)
Intruded in: Kiretto Andesite

Lithofacies: Hypersthene augite andesite

Southern Yatsugatake volcanoes
[ Upper ]
+__+__+__+__+_
Nakadake Porphyrite
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Kiretto Andesite
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[ Lower ]

Yatsugatake volcanoes (South of Natsuzawa pass)
[ Upper ]
+__+__+__+__+_
Southern Yatsugatake volcanoes
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[ Lower ]

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

Distribution: Mount Nakadake - Hagetsurune peak, Chino city - Hara city, Suwa county, Nagano pref.

Nishiki et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.5, pp.193-211 DOI
Kawachi (1977) Geology of the Yatsugatake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 92p. (in Japanese with English abstract 4p.)