CLAY MINERALS IN GICHIDOS, GICHIDO-LIKE SOILS AND POLDER SOILS IN THE CHIKUGO PLAIN
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概要
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The clay minerals in the Gichidos (sticky soils), polder soils and Gichidolike soils collected from seven localities on the Chikugo Plain were identified and studied. 1. The Gichidos are usually found in places with an altitude 3 to 5m above sea level. They contain beidellite-nontronite as their main constituent, and illite, vermiculite and kaolin as accessary minerals. 2. The polder soils are derived from very recent marine sediments in the Ariake Bay. Their clay mineral composition is not much different from that of the Gichidos. 3. The Gichido-like soils from two localities contain halloysite as a major constituent. It appears forming a mixed-layer mineral with much smaller amount of montmorillonite in the Hainuzuka clay, while it appears nearly pure, spherical halloysite in the Kamenoko clay. The differences observed in the morphology of the clay particles between the three groups of the soils are suggested to provide an account of subtle differences in their physical properties, particularly stickiness experienced in the field.
- 日本粘土学会の論文