The Aubukuma Metamorphic Belt is famous by the petrological work of Miyashiro (1958, etc. ). But his scheme on the metamorphic history has been largely rewritten by the Research Group of the Abukuma Plateau including Y. Kuroda, K. Uruno, K. Nureki, I. Hara, S. Kanisawa, T. Maruyama, H. Umemura and the author who proposed the hypothesis of polymetamorphic basement. The hypothesis has been evidenced, first, by the discoveries of polymetamorphic relics - of kyanite and staurolite from the Gosaisho-Takanuki metamorphic rocks and secondly, by the confirmation of Rb-Sr isochron ages of 400 to 600 m. y. of the Ishikawa, the Miyamoto, and the Samegawa plutonic masses. Since 1963 they have been engaged with research from such standpoint and the up-to-date data has been published in the memoir titled “The Basement of the Japanese Islands”
However the idea of the polymetamorphic basement should be desce n ded from the “Diaphthoritic Rocks” prese nted by K. Sugi (1935) and his first finding of staurolite from Shiiohira coal mine. The detailed review will be described in the text.
