Abstract
The mineral composition of the soil clay fractions in natural levee and back slough of Takeda River, Fukui Prefecture, Central Japan was estimated by the method using X-ray diffraction and thermogravimetry after Kitagawa et al.(1994). The results was summarized as follows:
Kaolin minerals, chlorite, mica minerals, chlorite-vermiculite intergrade, vermiculite, smectite and amorphous materials were detected in each horizon of the soils. It was suggested that these minerals originated mainly in the materials transported from the upper stream of the river. Moreover, the contents of clay minerals were not different between the natural levee soils and the back sloughones. This result was different from the conclusion in the meander belt of alluvial plains in Northeast Japan after Saegusa (1979), in which chlorite and kaolinite are dominant in the soils of natural levee while smectite is dominant in those of back slough. Thisshould be due to the regional difference or the scale of alluvial plain.
