秋田駒ヶ岳のテフラ層序と噴火活動 Tephra Stratigraphy and Eruptive Activities of the Akita-Komagatake Volcano

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The Akita-Komagatake, located in the central part of the Ou Back-Bone Range, northeast Japan, is a Quaternary volcano with two calderas. The tephra, younger than 13,500 y.B.P., erupted from this volcano, are stratigraphically divided into thirteen formations, namely AK-13 to AK-1 in ascending order, on the basis of buried soil and loess intercalated. The tephra consists of three types of lithologies: such coarse-grained essential materials as pumice and scoria (type 1), well-sorted black to brown sandy ash (type 2), and fine-grained ash frequently including accretionary lapilli (type 3). These lithologic types are resulted from different styles of volcanic eruption: Plinian to subplinian style eruption (type 1), vulcanian to phreatoplinian style eruption (type 2) and phreatoplinian style eruption (type 3). <sup>14</sup>C measurements on humic soil or woods just below or above the tephra reveal the tendency that the explosive eruptions at the Akita-Komagatake volcano occured during three stages; 13,500 to 11,600 y.B,P., 10,000 to 7,100 y.B.P. and 4,000 to 1,000 y.B.P. In the first stage, AK-13, main part of which is called the Koiwai Pumice, and AK-12, the Yanagisawa Pumice, were erupted. During the eruption of the Koiwai Pumice, the Obonai Pyroclasitic Flow Deposits was produced. The volumes of erupted materials for the tephra including the pyroclastic flow deposit are more than 0.6 km<sup>3</sup>, and two calderas are thought to have been formed in this stage. In the second stage, AK-11 to AK-6 were erupted. AK-9, the Arasawa Pumice (newly named in this paper), and AK-8, the Horikiri Pumice, are dominated by pumice and scoria (lithologic type 1), and their volumes of erupted materials are more than 0.1 km<sup>3</sup>. The volumes for other tephra in this stage is more than 0.046km<sup>3</sup>. Through the second stage to the last stage, the volumes of erupted materials tend to become smaller than 0.046km<sup>3</sup>.

収録刊行物

  • 火山

    火山 42(1), 17-34, 1997

    特定非営利活動法人 日本火山学会

参考文献:  33件中 1-33件 を表示

被引用文献:  5件中 1-5件 を表示

各種コード

  • NII論文ID(NAID)
    110003041045
  • NII書誌ID(NCID)
    AN10512786
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0453-4360
  • NDL 記事登録ID
    4170834
  • 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書誌  CJP引用  NDL  NII-ELS  J-STAGE 
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