首页> 外文期刊>地質学雑誌 >U-Pb zircon dating of the Sanbagawa metamorphic rocks in the Besshi—Asemi-gawa region, central Shikoku,Japan, and tectono- stratigraphic consequences
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U-Pb zircon dating of the Sanbagawa metamorphic rocks in the Besshi—Asemi-gawa region, central Shikoku,Japan, and tectono- stratigraphic consequences

机译:U-PB Zircon在Besshi-asemi-Gawa地区,中央Shikoku,日本和构造 - 地层后果约会的Sanbagawa变质岩。

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摘要

The aim of this study is to addresses unresolved issues associated with the depositional and metamorphic ages of the Sanbagawa metamorphic rocks (central Shikoku, Japan). We performed laser-abla- tion inductively-coupled plasma mass spectrometry (LA-ICP-MS) zircon U-Pb analysis on psammitic schists from the Sanbagawa metamorphic rocks (sensu stricto) in the Besshi-Asemi-gawa region. Young U-Pb ages of ca. 100-90 Ma were found in all analysed samples, regardless of the metamorphic grade. These results suggest that the Sanbagawa metamorphic rocks from the upper chlorite to oligo- clase-biotite zones are metamorphic equivalents of the Cretaceous Northern Shimanto accretionary complex, which also underwent prograde metamorphism after ca. 100-90 Ma. Based on our results and previous geochronological data from the Sanbagawa metamorphic rocks, we suggest that the Sanbagawa metamorphic belt consists of three metamorphic units, which are characterized by different depositional and metamorphic ages. These three units, from old to young, are here referred to as the Besshi,Asemi-gawa, and Oboke units.
机译:本研究的目的是解决与Sanbagawa变质岩石(中央Shikoku,日本)的沉积和变质年龄相关联的未解决问题。我们对Besshi-Asemi-Gawa地区的Sanbagawa变质岩石(Sensu Sticalo)进行了激光 - 粘液电感耦合等离子体质谱(La-ICP-MS)锆石U-PB分析。 CA的年轻U-PB年龄。在所有分析的样品中发现100-90 mA,无论变质等级如何。这些结果表明,来自上氯酸盐到寡核苷酸 - 生物烟区的Sanbagawa变质岩石是白垩纪北部的半北部膨化复合物的变质等同物,在CA之后也经历了翼展变质。 100-90 mA。根据我们的结果和来自Sanbagawa变质岩石的先前地理学数据,我们建议Sanbagawa变形带由三个变质单位组成,其特征在于不同的沉积和变质年龄。这三个单位从旧到年轻人,这里都被称为Besshi,Asemi-Gawa和Oboke单位。

著录项

  • 来源
    《地質学雑誌》 |2019年第2期|共12页
  • 作者单位

    Department of Applied Science Okayama University of Science Okayama 700-0003 Japan;

    Department of Applied Science Okayama University of Science Okayama 700-0003 Japan;

    Department of Chemistry Gakushuin University Tokyo 171-8588 Japan;

    Department of Geology and Mineralogy Kyoto University Kyoto 606-8502 Japan;

    Department of Biosphere-Geosphere Science Okayama University of Science Okayama 700-0005 Japan;

    Research Institute of Natural Sciences Okayama University of Science Okayama 700-0005 Japan;

    Graduate School of Environment and Information Sciences Yokohama National University Kanagawa 240-0067 Japan;

    Geochemical Research Center The University of Tokyo Tokyo 113-0033 Japan;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 jpn
  • 中图分类 地质学;
  • 关键词

    Sanbagawa; zircon; U-Pb; LA-ICP-MS;

    机译:Sanbagawa;锆石;U-PB;LA-ICP-MS;

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