Tsukiyo Member

[ Top ] [ Japanese ]

Tsukiyo Member Matsuda, 1961

Type locality: Togurigawa river, Oritsuki, Nanbu city, Minamikoma county, Yamanashi prefecture
Volcanic rocks
Trough basin-fill deposit at the collision boundary between Izu-Bonin-Mariana arc and Southwest - East Japan island arc
Back-arc basin volcanic activity at the back-arc basin of Izu-Bonin-Mariana arc
late Miocene
Correlation: Shinoisan Member

Sedimentary facies: Marine
Lithofacies: Andesite - Basalt tuff
Lithofacies (Minor): Tuff breccia, Tuffaceous mudstone, Interbedded sandstone and mudstone, Conglomerate, Basalt pillow lava

Thickness: 1,000 m or thicker
Lower limit: Transitional (Oritsuki Member)

Shizuoka Formation
[ Upper ]
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Tsukiyo Member
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Oritsuki Member
?--?--?--?--?-
Kaibushi Member
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[ Lower ]

Fujikawa Group (Western zone)
[ Upper ]
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Shizuoka Formation
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[ Lower ]

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

Distribution: Togurigawa river - Oshirogawa river - Aimatagawa river - Fukushigawa river, Nanbu city, Minamikoma county, Yamanashi pref.; Okitsugawa river, Shimizu ward, Shimizu city, Shizuoka pref.

Sugiyama and Matsuda (2014) Geology of the Nanbu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 134p. (in Japanese with English abstract 5p.)