Swelling and mineralogy of smectites in paddy soils derived from marine alluvium,Japan |
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| Authors: | Kazuhiko Egashira Masami Ohtsubo |
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| Institution: | Faculty of Agriculture, Kyushu University, Fukuoka Japan |
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| Abstract: | A low-swelling smectite exhibiting little intra-crystalline swelling even after saturation with Na was found in paddy soils derived from marine alluvium of Ariake Bay in Kyushu, Japan. The low-swelling smectite was considered to be beidellite-nontronite mineral containing as much as 10% Fe2O3. The low-swelling characteristics of this smectite are ascribed to the considerable substitution of Fe2+ for Al3+ in the ochtahedral layer which depresses the dissociation of unit layers of smectite. Transformation of low-swelling to high-swelling smectite is believed to be due to the oxidation of Fe2+ to Fe3+ in the octahedral layer. |
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