[SMP34-P01] Pumpellyite-bearing retrograde mineral assemblage of the Yunotani eclogite and the areal extension of eclogite-facies metamorphism in the Omi area, Japan
Keywords:Yunotani eclogites, blueschist-facies, pumpellyite, Omi Schists, Renge metamorphic belt, Late Paleozoic
We have also examined the areal extension of eclogite-facies metamorphism in the Omi area using mineral assemblages of the pelitic schists. Previous studies of the Yunotani Valley revealed that the eclogite-hosted pelitic schist was characterized by the mineral assemblage garnet + paragonite + phengite ± ferroglaucophane + rutile + quartz. Our new exploration in the Kanayamadani Valley, located about 3 km south-east of the Yunotani Valley, confirmed abundant paragonite- and garnet-bearing pelitic schist. The calculated stability of the mineral assemblage in a P–T pseudosection overlaps with a P–T condition of the Yunotani eclogites. This supports the previous prediction of the areal extension of 'Eclogitic Unit' ; our study revealed that the Eclogitic Unit extends at least 3 km from the Yunotani to the Kanayamadani Valley.