Clay minerals of soils from olivine basalt in Kyushu

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Abstract
Soil scientists have been encouraged to investigate soils for clay minerals by very fact that soil characteristics fundamentally depend upon the nature of their clay. It is generally recognized that clays of different species develop under different conditions such as drainage, temperature weathering age, and parent rocks. On Kyushu Island, heavy, reddish soils derived from olivine basalt cover a considerably large area of its northeastern part, and a numbar of small islands belonging to Kyushu. Koga * Hiroshi Koga, Clay minerals of Oura basaltic soil, 1954 (unpublished). View all notes of this laboratory found a basaltic soil of clay consisting of hydrated halloysite, halloysite, hematite, and gibbsite at the eastern foot of Mt. Tara, by examining its clay separates by X-ray, thermal, chemical, and electron microscopical techniques. Kanno et al5 reported that in a basaltic soil at Oura, Saga prefecture, hydrated halloysite developed from plagioclase and ferro-magnesian minerals with gibbsite and hematite which was more abundant than in other Red and Yellow Soils. They also found some illite present in the soil derived from unknown minerals, and halloysite dehydrated in upper layers.

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