日高山脈北部の日勝峠花こう岩体のRb‐Sr全岩アイソクロン年代  [in Japanese] Rb-Sr whole-rock isochron age of the Nissho Toge granite complex, northern Hidaka Mountains, central Hokkaido, Japan  [in Japanese]

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Author(s)

    • 倉本 能行 Kuramoto Yoshiyuki
    • 北海道大学大学院理学研究院自然史科学部門 Department of Natural History Sciences, Faculty of Science, Hokkaido University
    • 吉野 昭成 Yoshino Akinari
    • 北海道大学大学院理学研究院自然史科学部門 Department of Natural History Sciences, Faculty of Science, Hokkaido University
    • 前田 仁一郎 Maeda Jinichiro
    • 北海道大学大学院理学研究院自然史科学部門 Department of Natural History Sciences, Faculty of Science, Hokkaido University

Abstract

We obtained a Rb-Sr whole-rock isochron age of 17.7±0.6 Ma from the Nissho Toge granite complex, which intruded the upper portion of a ∼20-km-thick crustal section exposed in the northern Hidaka Mountains, central Hokkaido, Japan. The initial <sup>87</sup>Sr/<sup>86</sup>Sr ratio is 0.70422±0.00009. This age is similar to U-Pb zircon ages reported previously for the Pankenushi gabbro and Magarisawa tonalite (18.5±0.3 Ma and 18.7±0.5 Ma, respectively), which are both located in the lower portion of the crustal section examined in the present study. Our result suggests that almost all of the magmatic bodies in the crustal section were emplaced contemporaneously, during the Early Miocene.

Journal

  • The Journal of the Geological Society of Japan

    The Journal of the Geological Society of Japan 117(1), 57-60, 2011

    The Geological Society of Japan

Codes

  • NII Article ID (NAID)
    130000655162
  • NII NACSIS-CAT ID (NCID)
    AN00141768
  • Text Lang
    JPN
  • ISSN
    0016-7630
  • NDL Article ID
    10992933
  • NDL Source Classification
    ZM49(科学技術--地球科学--地質)
  • NDL Call No.
    Z15-174
  • Data Source
    NDL  J-STAGE 
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