大雪湖周辺の縞状粘土層中の層間褶曲
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概要
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Intraformational foldings exist in the banded clay bed at the upper part of the Sangoku Formation (upper Pleistocene) around Daisetu Lake. Hokkaido, Japan. These foldings were studied on the basis of geological and soil mechanical examinations. The forces which caused the intraformational foldings in this area and the origin of these foldings are discussed in this paper. The results of studies are as follows : 1) The banded clay bed is considered to be of the late Wurm glacial stage. 2) The intraformational foldings have the same direction of inclination, and it also coincides the direction of the force received. 3) The clay around the intraformational foldings is over consolidation clay, but the other clay is normal consolidation clay. 4) The place where the force was received and the zone influenced by the force can be assumed from analysis of the former maximum pressure. 5) Three geologic columns of different outcrops can be correlated on the basis of the presence of the intraformational foldings. From the columns it is suggested that the banded clay have suffered from heavy pressure 7-10 times. From these results the following conclusions may be drawn. The banded clay was deposited in Paleo Lake Daisetu in the late Wurm glacial stages. Masses of ice and snow sometimes flowed into the lake from the east slope of the Daisetu Mountains. Therefore this clay was dragged by the masses of ice and snow, and then the intraformational foldings were formed in the banded clay bed. Hight of the masses of ice and snow can be estimated to be 60-65 m.
- 日本粘土学会の論文
- 1980-03-25
著者
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