Gotsu Volcanic Rocks

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Gotsu Volcanic Rocks Imaoka et al., 1982

Type locality: Mount Murogamiyama (Mount Asarifuji) - Mount Shimaboshiyama - Atoichi - Seimi, Gotsu city, Shimane prefecture
Volcanic rocks
Late Cretaceous (75, 63 Ma, FT)
Intruded by: Arifuku Quartz Diorite, Yakami body

Lithofacies: Rhyolite tuff, Lapilli tuff
Lithofacies (Minor): Pyroclastic surge deposit
Lithofacies (Basal): Tuffaceous conglomerate

Thickness: 800 m or thicker
Upper limit: Unconformity (Murogamiyama Formation)
Lower limit: Unconformity (Meta-mafic rocks)

Gotsu Volcanic Rocks
[ Upper ]
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Asarifuji Rhyolite
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Shimaboshiyama Rhyolite
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Tokuda Rhyolite
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Atoichi Andesite
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Seimi Rhyolite
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[ Lower ]

Inbi stage volcanic rocks
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Daito Volcanic Rocks
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Kamishima Volcanic Rocks
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Gotsu Volcanic Rocks
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Sanin Belt
[ Young ]
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Tamagawa stage volcanic rocks
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Younger Inbi stage intrusive rocks
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Older Inbi stage intrusiv rocks
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Inbi stage volcanic rocks
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Mochigase stage intrusive rocks
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Mochigase stage volcanic rocks
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[ Old ]

------ Transitional, ~~~~~~ Intrusive, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

Distribution: Asari - Gonokawa river - Mount Murogamiyama (Mount Asarifuji) - Mount Shimaboshiyama - Atoichi - Seimi, Gotsu city, Shimane pref.

Kano (2018) Jour. Geol. Soc. Japan, vol.124, no.10, pp.781-803 DOI
Kano et al. (2001) Geology of the Yunotsu and Gotsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 129p. (in Japanese with English abstract 5p.)