Physical, Chemical and Mineralogical Characteristics and Pedogenesis of Peaty Soils of Mt. Kurikoma

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The Ukamikamagoke peaty section is interstratified with several different layers of tephra, white clay deposits and iron deposits. High amounts of fine-grained inorganic components in the peaty section indicate additions of eolian materials into this peaty area. Coarse fractions were found in the layers of pumice, white clay deposits and iron deposits, suggesting the influence of local materials too. Pedogenesis of this peaty area was mainly influenced by materials from two origins, tephra and long-range eolian dust. The presence of allophane and ferrihydrite in the section indicated the influence of tephra. The influence of long-rang eolian dust, on the other hand, is evidenced by the presence of clay-sized crystalline minerals, particularly smectite, mica, kaolinite and silt-sized quartz. The section also had thick layers of pyrophylliteenriched white clay and iron deposits which might have probably formed from alluvial deposits about 13,000 years ago according to ^<14>C dating of plant residues. The ^<14>C dating of plant residues gave an older age than that of humic acid did, suggesting that humic acid is not suitable for ^<14>C dating in this peaty area. The upper part of the section was dominated by diatoms and ferrihydrite, and the lower part by allophane. The section also contained large amount of goethite. Humic acid in the peaty section belonged to the Rp type. The Rp type humic acid in the strongly acidic environment showed very low ability to inhibit the formation of allophane and the crystallization of iron oxides.
日本ペドロジー学会の論文
1997-12-31

Physical, Chemical and Mineralogical Characteristics and Pedogenesis of Peaty Soils of Mt. Kurikoma

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