西南日本内帯大江山地域の普甲峠変成沈積岩に産する4～4.4億年含藍晶石緑れん石角閃岩
作者： Tatsuki Tsujimori , Katsuichi Nishina , Akira Ishiwatari , Tetsumaru Itaya
关键词: Peridotite 、 Epidote 、 Petrology 、 Schist 、 Metamorphic rock 、 Kyanite 、 Clinozoisite 、 Geology 、 Hornblende 、 Paragonite 、 Geochemistry
摘要: The Fuko Pass metacumulate is a tectonic block (4.5×1.5 km in size) within the Oeyama peridotite body Inner Zone of southwestern Japan. It was metamorphosed under high-pressure and moderate-temperature condition to form mineral assemblage hornblende+clinozoisite+kyanite+paragonite+albite+rutile. K-Ar ages were determined on hornblende separates from four epidote amphibolite samples, yielding 443-403 Ma. This suggests Siluro-Ordovician subduction-related metamorphic event for metacumulate, which distinct Late Paleozoic high-P/T type events Renge belt correlated, age, with Early schists (445-402 Ma) Kurosegawa klippe Outer Zone.
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