赤石山地四万十帯白亜系赤石層群から得られた砕屑性ジルコンU-Pb年代  [in Japanese] Detrital zircon U-Pb ages of the Cretaceous Akaishi Group in the Shimanto Belt, Akaishi Mountains  [in Japanese]

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Author(s)

    • 志村 侑亮 Shimura Yusuke
    • 信州大学総合理工学研究科地球学ユニット Department of Geology, Graduate School of Science and Technology, Shinshu University
    • 竹内 誠 Takeuchi Makoto
    • 名古屋大学大学院環境学研究科 Department of Earth and Planetary Sciences, Graduate School of Environmental Studies, Nagoya University
    • 山本 鋼志 Yamamoto Koshi
    • 名古屋大学大学院環境学研究科 Department of Earth and Planetary Sciences, Graduate School of Environmental Studies, Nagoya University

Abstract

<p>We conducted U-Pb dating of detrital zircons from three sandstones of the central section of the Akaishi Group, which is part of the Shimanto Belt in the Akaishi Mountains. The youngest single-grain ages are 113.6±2.3 Ma (1σ), 114.1±1.6 Ma (1σ), and 100.8±1.2 Ma (1σ) from west to east. The weighted mean ages of the youngest clusters are 115.4±1.4 Ma (1σ), 125.8±1.6 Ma (1σ), and 107.5±1.5 Ma (1σ). These results indicate that the central part of the Akaishi Group was deposited after the Aptian or Albian (Early Cretaceous). The zircon ages are slightly older than the radiolarian ages (Albian to Cenomanian), but the two sets of ages are consistent.</p>

Journal

  • The Journal of the Geological Society of Japan

    The Journal of the Geological Society of Japan 124(7), 539-544, 2018

    The Geological Society of Japan

Codes

  • NII Article ID (NAID)
    130007436977
  • NII NACSIS-CAT ID (NCID)
    AN00141768
  • Text Lang
    JPN
  • ISSN
    0016-7630
  • NDL Article ID
    029191743
  • NDL Call No.
    Z15-174
  • Data Source
    NDL  J-STAGE 
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