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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, Busetsu Granite, Inagawa Granite, Mitsuhashi Granite, Kamihara Tonalite, Shinshiro Tonalite, Sakuraiji Clastic Dike, Dolerite, Andesite, Felsic rock dikes

• 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: ca. 5,300 - 16,000 m
• Thickness (Biotite zone): ca. 5,000 m or thicker
• Thickness (K-feldspar-Sillimanite zone): 1,800 m
• Thickness (Garnet-Cordierite zone): 1,700 m or thicker
• Distribution (Width): ca. 0.1 - 2 km
• Distribution (Width, Biotite zone): ca. 4.5 - 6 km
• Distribution (Width, K-feldspar-Sillimanite zone): ca. 4 - 5 km
• Upper limit: Transitional (Kuga Group), Abut unconformity (Usuzawa Member), Unconformity (Izumi Group, Enrei Volcanic Rocks, Ryusenji Formation, Motojuku Formation)

------ 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 Dandosan - Toyokuni - Mount Dekiyama, Shitara city, Aichi pref.; Hazu, Aichi pref.; Mount Hongu - Tsukude, Shinshiro city, Aichi pref.; Mount Ooku, Miuchi village, Toyota city, Aichi pref.; Lake Okuyahagiko - Mount Nebisodake - Gotanda town, Toyota city, Aichi pref.; Yoshigyu town - Kamisobumi town - Kikudashi town - Daiyo town - Hatsuchi town, Okazaki city, 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.

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