西南日本内帯における新第三紀後半の岩脈群と広域応力場

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書誌事項

タイトル別名
  • Late Neogene Dike Swarms and Regional Tectonic Stress Field in the Inner Belt of Southwest Japan
  • セイナン ニホン ナイタイ ニ オケル シンダイ3キ コウハン ノ ガンミャク

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抄録

The preferred orientations of dike swarms of four areas formed from Late Miocene to Pliocene are investigated in order to know the age of change of regional tectonic stress orientation in the inner belt of Southwest Japan. As the mechanism of dike formation is considered to be a natural magma-fracturing experiment and dikes are regarded as fossil tension cracks formed parallel to the direction of horizontal maximum compression stress (σHmax) of regional tectonic origin, the preferred direction of σHmx could be determined from the most concentrated trend of dikes of a swarm. The most concentrated trend of dikes at northern Tango Peninsula, Shimane Peninsula, Susa area and Myoken area are N-S, N-S, N10°W and N30°W, respectively. The directions of σHmax obtained from the preferred orientation of dike swarms of the four areas coincide with the direction of the maximum compressional principal tectonic stress obtained from the strike and the sense of motion of faults and folds formed in the same age. This result gives the estimation that the average direction of σHmax in the inner belt of Southwest Japan was N15°W±15° from Late Miocene to Pliocene.

収録刊行物

  • 火山.第２集

    火山.第２集 24 (3), 153-168, 1979

    特定非営利活動法人 日本火山学会

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