Geochemical study of the redistribution of elements in soil—I. Evaluation of degree of weathering of transported soil materials by distribution of major elements among the particle size fractions and soil extract |
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| Authors: | Toshiyuki Wakatsuki Hisao Furukawa Kazutake Kyuma |
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| Institution: | 1. Department of Agricultural Chemistry, Faculty of Agriculture, Kyoto University, Kyoto, Japan;2. The Center for Southeast Asian Studies, Kyoto University, Kyoto, Japan |
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| Abstract: | Sixteen alluvial and terrace soils from Japan and Thailand were separated into six fractions ; an amorphous sesquioxide and combined organic matter fraction, crystalline sesquioxides, clay, silt, fine sand and coarse sand. Content of ten major and minor elements in these six fractions was analyzed; SiO2, A12O3, Fe2O3, MgO, CaO, K2O, TiO2, Rb2O and SrO were determined by X-ray fluorescence spectrometry, and Na2O was determined by neutron activation analysis. The clay, silt, fine sand and coarse sand mineralogy were estimated semi-quantitatively by X-ray diffraction methods.We propose three indices of geochemical maturity for the soils and test their usefulness as measures of the degree of weathering. Three concomitant factors are proposed to measure the relative resistate, hydrolyzate and oxidate nature of the major elements in the soils. |
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