Abukuma metamorphic belt

Japanese: 阿武隈変成帯 - あぶくまへんせいたい

This metamorphic belt occupies the main part of the Abukuma Highlands and is indicated by the distribution of the Abukuma Metamorphic Rocks in a broad sense. It is distributed with a large amount of granite. The metamorphic rocks are mainly distributed in the Gosaisho and Takenuki areas. The metamorphic rocks in this region are mainly of mafic origin in the eastern part and are called the Gosaisho Metamorphic Rocks, while the metamorphic rocks in the western part are mainly of sandstone origin and are called the Takanuki Metamorphic Rocks. There are theories regarding the metamorphism and the timing of metamorphism, such as a single metamorphism (low-pressure metamorphism in the Cretaceous Period) or multiple metamorphisms (lianisme-silimanite metamorphism before the low-pressure type). There is also a theory that it is an extension of the Ryoke Belt or Unazuki Belt in southwestern Japan. The radiometric age of the metamorphic rocks and granite is Cretaceous.

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

阿武隈高地の主部を占め，広義の阿武隈変成岩の分布によって示される変成帯。大量の花コウ岩類が分布する。変成岩類は御斎所(ごさいしょ)・竹貫(たかぬき)地域におもに分布。この地域の変成岩は東部がおもに苦鉄質岩起源で御斎所変成岩と，西部がおもに砂泥質岩起源で竹貫変成岩と呼ばれている。変成作用や変成時期については，単一の変成作用（白亜紀に低圧型の変成作用）とする考えや複数の変成作用（低圧型の前にラン晶石―ケイ線石型の変成作用）を受けているとする考えがある。また西南日本の領家帯または宇奈月帯の延長とする説もある。変成岩類や花コウ岩類の放射年代は白亜紀。

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