On Alteration of the Landslide Area at the Asari River in Otaru, Hokkaido, Japan

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It has been revealed by geologic survey that the landslide phenomena at the Asari river happened in only the altered rhyolite and rhyolitic tuffs, relating to hydrothermal alteration subsequent to acidic volcanism.<BR>Data on clay minerals by chemical, thermal and infrared absorption analysis, and X-ray diffraction method indicate that the alterations can be classified into three types, which are (I) the hydrothermal alteration characterized by the mineral assemblage of pyrophyllite-kaoline-alunite, (II) the hydrothermal alteration characterized by the mineral assemblage of sericite-chlorite and (III) the regional propylitic alteration.<BR>It may be considered that the hydrothermal alteration zone were formed along the shear zone, in which layers consisting clay minerals were concerned with the cause of the landslide phenomena in this area.
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