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Akiyoshi Belt

Invalid synonym: Akiyoshi terrane

• Type locality: Akiyoshi, Yamaguchi prefecture
• Accretionary complex
• Oceanic island of hot spot volcano in Panthalassa ocean
• Seamount-reef complex
• Deposition (Limestone): early Carboniferous - middle Permian (Fusulinids, Foraminifera)
• Deposition (Matrix): Permian, Guadalupian, Wordian - Lopingian, Changhsingian (Radiolarians)
• Accretion: Permian

• Sedimentary facies: Marine
• Sedimentary facies: Seamount summit, Upper slope of seamount, Lower slope of seamount, Ocean floor, Trench-fill deposit
• Lithofacies: Basaltic rocks, Chert, Mudstone, Sandstone, Conglomerate, Acidic tuff
• Lithofacies (Seamount summit): Shallow marine limestone with minor reef
• Lithofacies (Upper slope of seamount): Clastic llimestone with minor sponge spicule chert
• Lithofacies (Lower slope of seamount): Sponge spicule chert with clastic llimestone
• Lithofacies (Oceanic floor): Radiolarian chert
• Lithofacies (Trench-fill): Sandstone, Mudstone, Limestone blocks

• Upper limit: Thrust fault (Sangun Metamorphic Belt)
• Lower limit: Thrust fault (Maizuru Belt, Ultra-Tamba Belt)

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

• Distribution: Mount Myojo, Niigata pref.; Mount Kurohime, Niigata pref.; Atetsudai - Ogadai, Okayama pref.; Taishakudai, Hiroshima pref.; Akiyoshidai, Yamaguchi pref., Fukuoka pref.
• Distribution: Itoigawa city, Niigata pref.; Kurome, Soryo village, Shobara city, Hiroshima pref.; Minochi - Joe - Kobatake - Iseki, Jinsekikogen city, Hiroshima pref.; Kawai, Fuchu city, Hiroshima pref.; Omine town, Mine city, Yamaguchi pref.
• Fossils (Limestone, Ammonoids): Otaceras sp., Proshumardites sp., Agathiceras sp., Cymoceras sp., Syngastrioceras sp., Aclistoceras sp., Clistoceras sp., Gastrioceras (Lissogastrioceras) sp., Owenoceras sp., Bisatoceras sp., Neoglaphyrites sp., Branneroceras sp., Diaboloceras? sp., Paralegoceras sp., Pseudoparalegoceras sp., Eowellerites sp., Wellerites sp., Fagingoceras sp., Winslowoceras sp., Okafujiceras sp., Akiyoshiceras sp., Eoasianites sp., Boesites sp., Pronorites sp., Pseudopronorites sp., Minepronorites sp.
• Fossils (Matrix, Radiolarians): Pseudoalboillella fusiformis, Pseudoalboillella aff. longicornis, Follicucullus monacanthus, Follicucullus sholasticus

• Fujikawa et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.8, pp.609-631 DOI
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• Tazawa et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.4, pp.168-176 DOI
• Sano et al. (2009) Jour. Geol. Soc. Japan, vol.115, Supplement, pp.71-88 DOI