隠岐島後,油井-長尾田地域における郡層と重栖層の火山岩類の岩石記載と全岩K-Ar年代 Petrography and K-Ar ages of volcanic rocks from the early Miocene Kori Formation and the latest Miocene Omosu Formation in the Yui-Nagooda area, Oki-Dogo Island, SW Japan

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The volcanic rocks of the early Miocene Kori Formation and the latest Miocene Omosu Formation are distributed in the Yui area, western part of Oki-Dogo Island. The Kori Formation consists of conglomerate, sandstone and siltstone intercalated with basalt, basaltic andesite and andesite lavas and sheets. Most of these volcanic rocks are subalkaline(arc tholeiitic). The volcanic rocks of the Omosu Formation is composed of shoshonite, rhyolite and trachyte lava and sheet with pyroclastic rocks. In the contrast with the volcanic rocks of the Kori Formation, the volcanic rocks of the Omosu Formation are characteristic of alkaline suite. This paper presents geology, petrography and K-Ar whole rock ages of the volcanic rocks of these formations. The volcanic rocks of the Kori Formation yielded K-Ar whole rock ages of 20.1±1.0Ma to 18.2±1.0Ma. The volcanic rocks of the Omosu Formation yielded whole rock K-Ar ages of 5.53±0.29Ma and 5.40±0.28Ma. These ages are consistent with the ages previously reported. The characters of volcanic activity changed from subalkaline and arc type in the early Miocene to alkaline and within plate(plume)type in the latest Miocene with hiatus of igneous activity during middle Miocene.13;

収録刊行物

  • 島根大学地球資源環境学研究報告

    島根大学地球資源環境学研究報告 (27), 1-9, 2008-12

    島根大学総合理工学部地球資源環境学教室

各種コード

  • NII論文ID(NAID)
    110008670534
  • NII書誌ID(NCID)
    AA11455176
  • 本文言語コード
    JPN
  • 資料種別
    Departmental Bulletin Paper
  • 雑誌種別
    大学紀要
  • ISSN
    13439774
  • NDL 記事登録ID
    10607681
  • NDL 雑誌分類
    ZM49(科学技術--地球科学--地質)
  • NDL 請求記号
    Z15-436
  • データ提供元
    NDL  NII-ELS  IR 
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