FERRIHYDRITE DEPOSITS IN PADDY RACES, ASO-DANI
スポンサーリンク
概要
- 論文の詳細を見る
A bright yellowish brown deposit on the walls and bases of water races in an area of paddy fields near Hontsuka Cone, Aso-Dani, is shown to be siliceous ferrihydrite. The deposit contains close to 50% Fe, 6% Si, and 13% H_2O (110℃ basis). Two broad peaks at 0.275 nm and 0.155nm, with possibly a third (much less perceptible) at about 0.22 nm, are observed in X-ray diffraction and an infrared absorption maximum for Si-O vibrations occurs at 964 cm^<-1>. The deposit forms as groundwater pumped from about 100m depth and containing close to 20g m^<-3> ferrous Fe and 35-75 g m^<-3>SiO_2 is released to the atmosphere and oxidised. This occurrence is similar to one in a streambed below a spring on an andesitic volcano in New Zealand and is a further example of the weathering of volcanic rocks giving rise to ferrihydrite.
- 日本粘土学会の論文
著者
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Matsue Naoto
Department Of Agricultural Chemistry Faculty Of Agriculture Ehime University
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Yoshinaga Naganori
Faculty of Agriculture, Ehime University
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Yoshinaga Naganori
Department Of Agricultural Chemistry Ehime University
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CHILDS CYRILW.
Department of Agricultural Chemistry, Faculty of Agriculture, Ehime University
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Childs Cyrilw.
Department Of Agricultural Chemistry Faculty Of Agriculture Ehime University
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