丹沢-大磯地域に分布する火山岩類の K-Ar 年代と南部フォッサマグナ地域における鮮新世火山フロントの西方移動

DOI Web Site BIBCODE 被引用文献3件 参考文献217件

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タイトル別名
  • K-Ar ages of volcanic rocks in the Tanzawa-Oiso area, central Japan: Implication for westward migration of the Pliocene volcanic front in the southern Fossa Magna region
  • タンザワ-オオイソ チイキ ニ ブンプ スル カザンガンルイ ノ K-Ar ネンダイ ト ナンブ フォッサマグナ チイキ ニ オケル センシンセイ カザン フロント ノ サイホウ イドウ

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抄録

  We determined K-Ar ages of the late Miocene to Pliocene andesitic to basaltic dykes and lavas distributed in the Tanzawa-Oiso area in the southern Fossa Magna region, central Japan. Our data indicate two distinct periods of volcanic activity in this region; one took place during the middle Miocene (about 15 Ma) and another during the late Miocene to Pliocene (7.5-4.2 Ma). Combined the present results with the age data reported previously from volcanic rocks in the southern Fossa Magna region, the present study suggests that the volcanic front in this region during 8 to 4 Ma was located at about 40 km east of the present-day volcanic front. The volcanic front began to migrate westward to the present-day location at about 4 Ma. The westward migration of volcanic front was probably associated with an abrupt change of lateral motion of the Philippine Sea Plate from north- northwestward to northwestward occurred between 4 and 2 Ma.<br>

収録刊行物

  • 岩石鉱物科学

    岩石鉱物科学 41 (3), 67-86, 2012

    一般社団法人　日本鉱物科学会

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