Slides Occurring in Hydrothermal Alteration Zones: An Example from the Kanehana

DOI Web Site 3 Citations 16 References
  • MAEDA Hiroyuki
    北見工業大学工学部土木開発工学科
  • SUZUKI Shunji
    北見工業大学大学院土木開発工学 北海道開発コンサルタント株式会社
  • TOSHIMA Hiroto
    北見工業大学大学院土木開発工学 北海道開発コンサルタント株式会社
  • YAMADA Tsukasa
    北見工業大学大学院土木開発工学 北海道開発コンサルタント株式会社

Bibliographic Information

Other Title
  • 熱水変質帯地すべり
  • ネッスイ ヘンシツ オビジスベリ ホッカイドウ トコログン ルベシベチョウカネハナ ヂスベリ チイキ ノ レイ
  • Slide Areas in the Rubeshibe District, Northeastern Hokkaido, Japan
  • 北海道常呂郡留辺蘂町金華地すべり地域の例

Search this article

Description

The geology of the Kanehana slide areas consists primarily of the Cretaceous-Paleocene Yubetsu Group, Upper Miocene Ikutahara and Yahagi Formations, Late Miocene andesite and rhyolite dikes, Lower Pliocene Hakugindai Lava, and Quaternary System. The Ikutahara Formation is distributed in the eastern part of the areas, and consists primarily of tuffaceous conglomerate, lapilli tuff, tuff, and rhyolite lavas. The Yahagi Formation is distributed in the western part of the areas, and consists primarily of tuffaceous conglomerate, sandstone and mudstone, pumice-tuff, and rhyolite lavas. The Hakugindai Lava unconformably covers the rocks of the Ikutahara and Yahagi Formations. In particular, the rocks of the Ikutahara and Yahagi Formations and andesite dikes were affected to various extents by hydrothermal alterations related to the Late Miocene epithermal gold-silver mineralizations of the Muka and Kunihana deposits.<BR>Hydrothermal alterations are divided into two stages. The stage I neutral-type alteration zones consist of K-feldspar, illite, interstratified illite/smectite, chlorite, zeolite, and smectite zones, while the stage II acid-type zones include kaolinite, veined 7 A halloysite-kaolinite, and veined smectite-kaolinite zones.<BR>Seven ancient slides and the Kanehana-toge slide occurred in hydrothermal alteration zones. The smallestscale Kanehana-toge slide and four intermediate-scale slides were closely related to the veined smectitekaolinite and smectite zones, respectively. Two large- and intermediate-scale slides were also closely related to the smectite zone, to the zeolite zone containing a relatively large amount of smectite, and/or to the kaolinite zone.<BR>The largest-scale ancient slide configuration was approximately 1, 450 m in width of displaced material, and approximately 1, 550 m in total length, and was of the “Concave Poly-Hill type” consisting of roughly twelve parts. On the other hand, the smallest-scale slide was approximately 20 m wide and approximately 70 m long. The small- and intermediate-scale slides were of the “Concave Hill type”.<BR>These data are useful for evaluating the degree of hazard of slides and for making a hazard map of slides in the hydrothermal alteration zones.

Journal

  • Landslides

    Landslides 33 (3), 19-24_1, 1996

    The Japan Landslide Society

Citations (3)*help

See more

References(16)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top