500 – 400Ma amphibolites in Japanese island

Abstract

The early-Paleozoic (500-400Ma) amphibolites occur in the Kitomyo, the Fuko pass, the Wakazakura area of SW Japan, and the Kiroko and the Motai area of NE Japan. These metamorphic rocks have a similar petrological feature, and provide a petrotectonic constraint on the earliest subduction event in the Japanese orogen. In this study, analytical results of these amphobolite and its related rocks are reported to clarify the tectonic development during the earliest stages of orogenic growth of Japanese island.