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Ryoke Metamorphic Rocks

Synonym: Ryoke Belt, Ryoke Metamorphic Belt, Ryoke Metamorphic Complex

A part of Shimanto Belt

• Low P/T metamorphic rocks
• Protolith: Jurassic
• Protolith: Tamba Belt, Mino Belt, Kuga Group
• Metamorphism (Chlorite zone): Late Cretaceous (99.4 Ma, K-Ar)
• Metamorphism (Chlorite-Biotite zone): Late Cretaceous (91.5 Ma, K-Ar)
• Metamorphism: Late Cretaceous (230 - 100 Ma, K-Ar; 100 - 90 Ma, CHIME)
• Correlation: Tsukuba Metamorphic Rocks, Wagakunisan Metamorphic Rocks
• Intruded by: Takato Granite, Dolerite, Andesite

• Metamorphic facies: Granulite
• Metamorphic facies (Biotite zone): 290 - 370 MPa, 506 - 593 degree C
• Metamorphic facies (K-feldspar-Sillimanite zone): 370 - 430 MPa, 547 - 709 degree C
• Metamorphic facies (Garnet-Cordierite zone): 430 - 570 MPa, 715 - 801 degree C
• Lithofacies (Protolith): Sandstone, Mudstone, Interbedded sandstone and mudstone, Turbidite
• Lithofacies (Protolith, Minor): Mafic rocks, Limestone, Conglomerate, Chert
• Lithofacies: Pelitic schist, Psammitic schist, Metachert
• Lithofacies (Chlorite-Biotite zone): Biotite slate
• Lithofacies (Biotite zone): Biotite schist, Schitose hornfles
• Lithofacies (Silimanite zone): Migmatite
• Structure (Protolith): Cross stratification, Graded bedding, Load cast

• Thickness: 5,300 m
• Distribution (Width): ca. 0.1 - 2 km
• Upper limit: Transitional (Kuga Group), Abut unconformity (Usuzawa Member), Unconformity (Izumi Group, Enrei Volcanic Rocks)

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

• Distribution: Saitama - Nagano - Tokai region - Kii peninsula - Shikoku - Kyushu
• Distribution: Okuryoke, Mizukubo town, Hamamatsu city, Shizuoka pref.; Nakazawa, Komagane city, Nagano pref.; Mount Tsukikurayama, Takato town, Ina city, Nagano pref.; Gonbetoge pass, Shiojiri city, Nagano pref.; Otagirigawa river, Akaho, Komagane city, Nagano pref.; Sogi town, Toki city, Gifu pref.; Ori, Inatsu town, Mizunami city, Gifu pref.; Tenryugawa river, Komagane city, Nagnao pref.; Mount Dando, Shitara city, Aichi pref.; Hazu, Aichi pref.; Mount Hongu, Shinshiro city, Aichi pref.; Mount Ooku, Miuchi village, Toyota city, Aichi pref.; Lake Okuyahagiko, Toyota city, Aichi pref.; Asuke area, Aichi pref.; Hirose - Kawagita - Bano river - Okuin river, Iga city, Mie pref.; Rokuroshi - Takahata, Iwakuni city, Yamaguchi pref.; Tanoshirihana cape, Suooshima city, Oshima county, Yamaguchi pref.

• Yamasaki et al. (2020) Geology of the Akechi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 120p. (in Japanese with English abstract 5p.)
• Shisaka et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.4, pp.263-278 DOI
• Terabayashi et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.8, pp.599-612 DOI
• Ikeda et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.7, pp.445-470 DOI
• Miyake et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.2, pp.59-72, DOI
• Owada et al. (2014) Jour. Geol. Soc. Japan, vol.120, no.11, pp.413-418 DOI
• Miyake et al. (2014) Jour. Geol. Soc. Japan, vol.120, no.9, pp.299-312 DOI
• Yamasaki (2013) Jour. Geol. Soc. Japan, vol.119, no.6, pp.421-431 DOI
• Kawakami and Nishioka (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.79-89 DOI
• Kamitomo et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.2, pp.88-91 DOI
• Makimoto et al. (1996) Geology of the Takato District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 6p.)
• Kawachi et al. (1983) Geology of the Ichinose District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 70p. (in Japanese with English abstract 6p.)
• Katada and Isomi (1962) Ina, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 28p. (in Japanese with English abstract 7p.)
• Katada and Isomi (1958) Agematsu, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 38p. (in Japanese with English abstract 8p.)
• Kawata and Yamada (1957) Iida, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 50p. (in Japanese with English abstract 12p.)
• Murayama and Katada (1957) Akaho, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 45p. (in Japanese with English abstract 6p.)