Chemical compositions and timing of activity of the Masaki Granite, northern Kyushu, Southwest Japan

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  • YUHARA Masaki
    Department of Earth System Science, Faculty of Science, Fukuoka University Kyushu Branch of the Association for the Geological Collaboration in Japan
  • MIZUTA Fumiya
    Department of Earth System Science, Faculty of Science, Fukuoka University
  • NISHI Eriko
    Kawasaki Geological Engineering Co., Ltd.,
  • KIYOURA Kairi
    Department of Community Medicine, Graduate School of Biomedical Sciences, Nagasaki University
  • KAMEI Atsushi
    Department of Earth Science, Interdisciplinary Faculty of Science and Engineering
  • KAWANO Yoshinobu
    Department of Environment Systems, Faculty of Geo-environmental Science, Rissho University
  • OKANO Osamu
    Department of Earth Sciences, Faculty of Science, Okayama University
  • HAYASAKA Yasutaka
    Department of Earth and Planetary Systems Science, Graduate School of Science, Hiroshima University, San-yo Branch, Earth Science Collaborative Research Association

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Other Title
  • 北部九州白亜紀花崗岩類，真崎花崗岩の化学組成と活動時期
  • ホクブ キュウシュウ ハクアキ ハナオカガンルイ,シンサキ ハナオカガン ノ カガク ソセイ ト カツドウ ジキ
  • Metamorphic P-T conditions and variation of REE between two garnet generations from granulites in the Sør-Rondane mountains, East Antarctica

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Abstract

<p>Major and trace elements analysis, U-Pb zircon dating, rare earth elements analysis and Sr-Nd isotope analysis were conducted on the Masaki Granite in the eastern part of northern Kyushu, Southwest Japan. This granite is mainly composed of coarse-grained porphyritic biotite granodiorite to granite. Wholerock chemical compositions of this granite indicate that the chemical variations can be mainly explained by fractional crystallization of plagioclase and biotite. The U-Pb zircon dating separated from the Masaki Granite gives an age of 103.73 ± 0.79 Ma. This age is thought to be a timing of activity of this granite. Initial Sr and Nd isotopic ratios corrected to 103.73 Ma of the two samples of the granite are the almost same and plotted within the range of the North Zone defined by Kagami (2005).</p>

Journal

  • Earth Science (Chikyu Kagaku)

    Earth Science (Chikyu Kagaku) 73 (3), 163-178, 2019-07-25

    The Association for the Geological Collaboration in Japan

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