山陽帯東部, 土岐花崗岩体の冷却史 Cooling history of the Cretaceous Toki granite in the eastern Sanyo Belt, Central Japan

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著者

    • 山崎 誠子 YAMASAKI Seiko
    • (独)日本原子力研究開発機構地層処分研究開発部門東濃地科学ユニット Tono Geoscientific Research Unit, Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency
    • 梅田 浩司 UMEDA Koji
    • (独)日本原子力研究開発機構地層処分研究開発部門東濃地科学ユニット Tono Geoscientific Research Unit, Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency

抄録

  The cooling history of the Crateceous Toki granite, exposed in the eastern Sanyo Belt, Central Japan, was constructed from various geochronological data. The granite yields K-Ar biotite ages of 74±2 to 72±2 Ma (±1σ) and K-Ar hornblende ages of 75±4 to 74±4 Ma, which are concordant with a previously reported Rb-Sr whole-rock isochron age. Fission-track ages of zircon and apatite in the granite give ages 73±3 to 64±3 Ma and 40±4 to 37±4 Ma, respectively. These above thermochronological data suggests two distinctive cooling stages for the Toki granite; 1) a first rapid cooling stage in which the granitic magma was cooled to the temperature of host rock soon after intrusion at depths of 5-7 km in the upper crust, and 2) second slow cooling stage (7-9 °C/m.y.) associated with the uplift and subsequent erosion of the granite intrusion after ∼ 70 Ma.<br>

収録刊行物

  • 岩石鉱物科学

    岩石鉱物科学 41(2), 39-46, 2012-03-30

    一般社団法人 日本鉱物科学会

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各種コード

  • NII論文ID(NAID)
    10030122057
  • NII書誌ID(NCID)
    AA1146088X
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    1345630X
  • NDL 記事登録ID
    023765223
  • NDL 請求記号
    Z15-117
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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