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Relationship between Landslides, Geologic Structures, and Hydrothermal Alteration Zones in the Ohekisawa-Shikerebembetsugawa Landslide Area, Hokkaido, Japan

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Journal of Earth Science and Engineering 2012年第6期2卷 317-327页

作者： Hiroyuki Maeda Takashi Sasaki Kazuyuki Furuta Katsuhiro Takashima Akihiro Umemura MasanoriKohno Sapporo Technology Professional Training College Sapporo 007-0895 Japan Earth Consultant UEYAMA Co. Ltd. Sapporo 060-0032 Japan Shin-Nikken Consultant Co. Ltd. Tokyo 133-0057 Japan Takashima Land and Buildings Investigator Office Nagano 399-8102 Japan Japan Foundation Engineering Co. Ltd. Osaka 530-0037 Japan Graduate School of Engineering Tottori University Tottori 680-8552 Japan

This paper elucidates the relationship between landslides, geologic structures, and hydrothermal alteration zones based primarily on X-ray powder diffraction and uniaxial compressive strength tests on weakly weathered and hydrothermally altered rocks from the Ohekisawa-Shikerebembetsugawa landslide area in Teshikaga Town, Hokkaido, Japan. The OHS （Ohekisawa slide） occurred on a dip slope of sedimentary rocks from the Upper Miocene Shikerepe Formation within a homocline, and also on weathered and hydrothermally altered rocks within the boundary area between the hydrothermal smectite zone and smectite-bearing mordenite zone. The SHS （Shikerebembetsugawa slide） occurred on a dip slope of sedimentary rocks from the Upper Miocene Hanakushibe Formation within wavy folds and was also controlled by a cap rock of Teshikaga Volcano Somma Lava. The SHS occurred also on weathered and hydrothermally altered rocks within the boundary area between the hydrothermal smectite zone and smectite-bearing laumontite zone. The mechanical properties of smectite, smectite-bearing mordenite, and smectite-bearing laumontite zone weakly weathered rocks indicate that they are very weak, soft rocks. These landslides are regarded as HAZLs （hydrothermal alteration zone landslides）. The hydrothermal alteration yielding smectite is thus closely related to these two ancient landslides, suggesting that the potential for HAZLs within a hydrothermal area can be assessed based on the swelling clay mineral-beating hydrothermal alteration types, dip slope, and cap rock.

关键词： HAZL (hydrothermal alteration zone landslide) swelling clay mineral-bearing hydrothermal alteration zone weatheredand hydrothermally altered soft rock dip slope cap rock.

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