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Ryukoma intrusion
Invalid synonym: Ryukoma Granite
- Type locality: Ryukoma, Okuizumo city, Nita county, Shimane prefecture
- Plutonic rocks
- Paleocene (60.5 Ma, Rb-Sr)
- Intruded by: Porphyrite dikes, Basalt dikes, Aplite, Pegmatite
- Intruded in: Shimohagi Granodiorite, Rhyolite - Dacite volcanic rocks
- Sedimentary facies: Batholith
- Lithofacies: I-type magnetite series
- Lithofacies: Biotite granite, Biotite granodiorite (deficient in hornblende)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Ryukoma - Miinohara - Komaki, Okuizumo city, Nita county, Shimane pref.; Moriwaki, Hiwa town, Shobara city, Hiroshima pref.
- Iwata et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.3, pp.190-204 DOI
- Igi and Sakamoto (1977) Geology of the Tari District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 45p. (in Japanese with English abstract 7p.)