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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; 108 - 101 Ma, Rb-Sr; 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, Ao Granite, Kabuto Granodiorite, Araki Granodiorite, Shobu Tonalite, Yamashiro Granite, Omine Granodiorite, Koya Granite, Shijonawate Granodiorite, Sagawa Granite, Sukawa Granodiorite, Yagyu Granite, Dolerite, Diorite dikes, 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
• Distribution (Length): ca. 900 km
• Upper limit: Transitional (Tsuge Formation, Kuga Group)

------ 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 - Okuingawa river - Kachiji - Taki - Aoyamagawa river - Ueno - Surumi - Hojiro - Mount Saikyozan - Korogigawa river - Mount Kasatoriyama - Mitanigawa river - Naganogawa river - Katsurahatagawa river, Iga city, Mie pref.; Mount Kannabiyama, Kyotanabe city, Kyoto pref.; Mount Ushitorayama, Ujitawara city, Tsuduki county, Kyoto pref.; Wazuka city, Soraku county, Kyoto pref.; Ariichi, Kasagi city, Soraku county, Kyoto pref.; Tomiomotomachi town, Ikoma city, Nara pref.; Daijisen town, Nara city, Nara pref.; Kamitsu - Hirose, Yamazoe city, Yamabe county, Nara pref.; Rokuroshi - Takahata, Iwakuni city, Yamaguchi pref.; Tanoshirihana cape, Suooshima city, Oshima county, Yamaguchi pref.

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