南関東の累積性火山灰土の土壌微細形態学的解析(I) : 大型薄片によるメソ形態学的観察

概要

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We aimed to clarify the micromorphological and mesomorphological character of soils of volcanic ash origin. These thick soils, called 'Kanto Loam', are distributed in the Tokyo district of Japan. They consist of many soil layers including buried surface horizons. We studied horizons characteristic of the upper layer of Tachikawa Loam (buried about 30,000 years ago) including the present surface horizon, the buried surface horizon, the soft loam horizon, the hard loam and the buried horizon containing 'Aira' volcanic ash. The result of observation of thin section was as follows. There were large amount of porosity values in a horizon near the present surface. The lowest horizon had the smallest porosity. The surface horizon had the vugh and chamber voids. The lowest horizon had the channel voids. Characteristic particles of thin sections, scoria and mineral grains, could be divided roughly into three groups. The first group consisted of reddish-brown particles. The second group consisted of black particles. The third group consisted of grey particles. The distribution and relative proportions of the three groups was different in each horizon.
国立科学博物館の論文
1995-12-25