Metamorphic age of the Southern Chichibu and Shimanto accretionary complexes in the Mitsumine district of the Kanto Mountains, central Japan: K-Ar ages of illite from phyllite

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  • 関東山地三峰地域，南部秩父帯・四万十帯付加コンプレックスの変成年代：千枚岩中のイライトのK-Ar年代
  • カントウ サンチ ミツミネ チイキ ナンブ チチブタイ シマントタイ フカ コンプレックス ノ ヘンセイ ネンダイ センマイガン チュウ ノ イライト ノ K Ar ネンダイ
  • Metamorphic age of the Southern Chichibu and Shimanto accretionary complex in the Mitsumine district of the Kanto Mountains, central Japan: K–Ar ages of illite from phyllite

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K-Ar ages of illite-rich fraction have been determined for phyllite from the Southern Chichibu and Shimanto accretionary complexes in the Mitsumine district of the Kanto Mountains, central Japan. The K-Ar ages indicate 71. 74 and 76 Ma from the Nippara Formation of the Southern Chichibu accretionary complex. In the Shimanto accretionary complex, the K-Ar ages present 65 and 76 Ma from the Futase Unit, 49Ma from the Kawamata Unit. In addition, phyllite deformed by pressure solution cleavage with shear is collected from Futase Unit, which indicates the K-Ar age of 50 Ma. It is conclueded that the Southern Chichibu and Shimanto accretionary complexes underwent the metamorphism simultaneously during 65-76 Ma in the latest Cretaceous time.<br>

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