Weathering of Crystalline Schists in the Kito-Munemori Landslide Area, Miyoshi-gun, Tokushima Prefecture (Part 2)

Weathering of Crystalline Schists in an Observation Test Pit

Abstract

A test pit for direct observation of landslide plane was digged through the Sambagawa crystalline schists in the Kito-Munemori landslide area, Tokushima Prefecture. In the test pit, the talus deposits which unconformably cover the crystalline schists were observed, and they are composed of debris and red soils intercalated a clay bed as landslide clay. The clay bed is mainly composed of chlorite schist which was crushed by movement of the talus deposits. Few secondary clay minerals except chlorite/vermiculite were found in the clay bed.