White mica K–Ar ages from lawsonite–blueschist facies Hakoishi sub–unit and from prehnite–pumpellyite facies Tobiishi sub–unit of the Kurosegawa belt, Kyushu, Japan
Abstract:White mica K-Ar age dating was carried out for metapelites in the Hakoishi sub-unit and a meta-pillow basalt in the Tobiishi sub-unit of the Kurosegawa belt (Kamimura et al., 2012), Yatsushiro district, Kyushu, Japan. The Hakoishi sub-unit suffered the lawsonite-blueschist facies metamorphism with peak conditions of 0.7-0.9 GPa and <300°C. Phengite separate with K content of 5.323 wt% from OD 28 gives 299.0 ± 6.1 Ma and those with K content of 1.222 wt% and 2.142 from OD 113 give 280.2 ± 5.8 Ma and 245.3 ± 5.1… Show more
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