岐阜県可児盆地に分布する蜂屋層最下部栃洞溶結凝灰岩部層のジルコンU-Pb年代  [in Japanese] Zircon U-Pb Ages of Tochibora welded tuff Member at the lowermost part of the Hachiya Formation, in Kani Basin, Gifu Prefecture  [in Japanese]

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Abstract

<p>岐阜県南部に分布する可児層群の最下部を占める蜂屋層は第一瀬戸内累層群東部で最も古い地層であり,主に非海成の火砕岩類からなる.蜂屋層最下部の栃洞溶結凝灰岩部層の溶結凝灰岩から分離したジルコンのレーザーアブレーションICP-MSによるU-Pb年代測定を行ったところ,<sup>238</sup>U-<sup>206</sup>Pb年代の加重平均として22.38±0.17Ma(2σ)が得られた.この年代は蜂屋層の堆積開始時期を拘束する.分析を行った溶結凝灰岩試料の蛍光X線分析による全岩主成分・微量元素組成を併せて報告する.</p>

<p>The Hachiya Formation of the Kani Group in southern Gifu Prefecture is the oldest sediment in the eastern part of the Setouchi Geologic Province, and is composed mainly of volcaniclastic rocks deposited in a nonmarine basin. We present the results of new laser ablation-inductively coupled plasma-mass spectrometry U-Pb analyses of zircons separated from a sample of the Tochibora Welded Tuff Member in the lowest horizon of the Hachiya Formation. The analyses yielded a weighted mean <sup>238</sup>U-<sup>206</sup>Pb age of 22.38±0.17 Ma (2σ), which constrains the time of initial sedimentation of the Hachiya Formation. The whole-rock major- and trace-element compositions of the welded tuff sample, analyzed by X-ray fluorescence, are also reported.</p>

Journal

  • The Journal of the Geological Society of Japan

    The Journal of the Geological Society of Japan 124(7), 533-538, 2018

    The Geological Society of Japan

Codes

  • NII Article ID (NAID)
    130007436930
  • NII NACSIS-CAT ID (NCID)
    AN00141768
  • Text Lang
    JPN
  • ISSN
    0016-7630
  • NDL Article ID
    029191741
  • NDL Call No.
    Z15-174
  • Data Source
    NDL  J-STAGE 
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