The Relationship between the Yasukuni Slide and a Hydrothermal Interstratified Illite/Smectite Minerals Zone

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  • MAEDA Hiroyuki
    Department of Civil Engineering, Faculty of Engineering, Kitami Institute of Technology
  • HIURA Hiromasa
    Environmental Technology Division, Faculty of Agricul-ture, Kochi University

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  • Relationship between the Yasukuni Slide and a Hydrothermal Interstratified Illite Smectite Minerals Zone

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説明

The geology of the Yasukuni landslide area consists mainly of tuffaceous clastic rocks and acidic volcaniclastic rocks of the Upper Miocene Ikutawara Formation, in which an interstratified illite/smectite minerals zone exists, formed by hydrothermal alteration related to the 8.1-7.7 Ma Ryuo hydrothermal system. The slide clays and debris contain large amounts of interstratified illite/smectite minerals. The occurrence of the Yasukuni slide is strongly related to the unstable nature of the interstratified illite/smectite minerals zone, the bulk of which is swelling clay mineral. This fact is useful in evaluating landslide risk and creating a hazard map of such slides in ancient and active hydrothermal fields.

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  • 地すべり

    地すべり 37 (4), 1-9_1, 2001

    公益社団法人 日本地すべり学会

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