K-Ar ages of the Enrei Formation distributed in Yokokawagawa area, Okaya City, Nagano Prefecture, central Japan

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  • 長野県岡谷市横河川流域に分布する塩嶺累層のK-Ar年代
  • ナガノケン オカヤシ ヨコカワガワ リュウイキ ニ ブンプ スル エンレイルイソウ ノ K Ar ネンダイ

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Five radiometric ages of volcanic rocks of the Enrei Formation, which is Plio-Pleistocene typical volcanic succession of the central part of the Fossa Magna region, has obtained by K-Ar method Radiometric ages, ranging from 1.12 to 1.47 Ma, are corresponding to those of the upper part of the Utsukushigahara Volcanic Formation and a part of the Kirigamine Volcanic Formation. Some radiometric ages which have previously reported are incompatible with stratigraphic data, so we have to examine this problem geologically and radiometically.

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