隠岐島前岩脈群と丹後半島岩脈群のK-Ar年代 : 通常号 K-Ar Ages of Oki-Dozen and Tango Dike Swarms, Western Honshu, Japan : Regular Section

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Eighteen new K-Ar ages for Neogene dike swarms at Oki-Dozen and Tango Peninsula, western Honshu, were determined. The K-Ar ages of dikes at Oki-Dozen area are within a narrow range of 5.7 and6.3 Ma, which are much younger than previously reported results. Slight shift, from N10-15E to N15-70 W, of regional compressional stress axis might have occurred around 6.2 Ma. The present age data for dike swarms from Tango Peninsula area suggest the existence of at least 3 separate periods of their activities, 15-11 Ma, 6 Ma and 3 Ma. Peak of the Miocene igneous activity was during 15-13 Ma, just after the opening period or Japan Sea. Although the present data indicate that the regional compressional stress axis of this area has been NS direction since 15 Ma, which seems not in accord with the conclusion given by TSUNAKAWA (1986), the difference might be explained by the absence of dike swams at 12-9 Ma and less than 1 Ma in the investigated sites in the present study.

収録刊行物

  • 火山. 第2集

    火山. 第2集 35(2), 217-229, 1990-07-02

    特定非営利活動法人日本火山学会

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各種コード

  • NII論文ID(NAID)
    110002993133
  • NII書誌ID(NCID)
    AN00035716
  • 本文言語コード
    JPN
  • 資料種別
    雑誌論文
  • ISSN
    04534360
  • NDL 記事登録ID
    3688677
  • NDL 刊行物分類
    ME41(火山・岩石)
  • NDL 雑誌分類
    ZM44(科学技術--地球科学--海洋・陸水・火山)
  • NDL 請求記号
    Z15-101
  • データ提供元
    CJP引用  NDL  NII-ELS 
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