Takakusayama Volcanic Rocks

Invalid synonym: Takakusayama Group (Takakusayama Volcanic Rocks and Ryuso Group), Takakusayama Formation, Okuzure Group, Okuzure Formation

Accretionary complex
Accretion: early - middle Miocene
Correlation: upper Ryuso Volcanic Rocks
Intruded by: Alkaline dolerite, Trachyte, Alkaline gabbro

Sedimentary facies: Marine
Sedimentary facies: Trench-fill deposit at the trench and the oceanic side slope of accretionary complex
Metamorphic facies: Prehnite-Pumpellyite, Zeolite
Lithofacies (Top): Tuff breccia, Interbedded tuffaceous sandstone and mudstone
Lithofacies: Alkaline basalt lava (Pillow lava), Trachyandesite lava
Lithofacies (Minor): Mudstone, Tuffaceous mudstone

Takakusayama Volcanic Rocks
[ Upper ]
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Miwa Member
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Hanazawa Member
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Main part
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[ Lower ]

Oigawa Group
[ Upper ]
/--/--/--/--/-
Takakusayama Volcanic Rocks
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Main part
/--/--/--/--/-
[ Lower ]

Shimanto Belt (Shizuoka pref.)
[ Upper ]
/--/--/--/--/-
Setogawa Group
/--/--/--/--/-
Oigawa Group
/--/--/--/--/-
Ryuso Group
/--/--/--/--/-
[ Lower ]

Shimanto Belt
[ Upper ]
/--/--/--/--/-
Northern Shimanto Belt
/--/--/--/--/-
Southern Shimanto Belt
?--?--?--?--?-
[ Lower ]

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

Distribution: Mount Takakusayama, Yaizu city - Fujieda city, Shizuoka pref.; Mariko - Okuzure seashore, Suruga ward, Shizuoka city, Shizuoka pref.; Nikenya - Kosaka, Shizuoka city, Shizuoka pref.
Fossils (Foraminifera): Lepidocyclina sp., Miogypsina sp.

Sugiyama and Shimokawa (1990) Geology of the Shimizu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 8p.)
Sugiyama et al. (1982) Geology of the Shizuoka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 82p. (in Japanese with English abstract 9p.)