関東地方の台地黒ボク土の生成と地形発達に関する研究-1-多摩川扇状地西部における地形面と黒ボク土の特徴

概要

論文の詳細を見る
Andosol (volcanic ash soil) has the widest distribution in the western part of Tama River fan. There are four major terraces in this region. The relationships between the characteristic of Andosol and four different terraces have been researched, based on the result of soil survey and mineralogical and chemical analysis of the soils. There is a close correlation between soil distribution and landform evolution.Conclusions are shown listed as follows:1) The highest terrace (Sayama hill) has undergone severe erosion continuously during the Holocene period. In the ridge of the hill, the Tachikawa and Musashino tephras have been eroded, resulting in the exposure of Shimosueyoshi or Tama tephra. The clay of the soil consists mostly of metahalloysite and halloysite.2) The soils on the higher and middle terrace (Shimosueyoshi and Musashino terrace) are typical and mature Andosol. The parent materials of the soils are presumably from the upper part of the Tachikawa tephra. These soils are characterized by the prevalence of amorphous inorganic matter; highly humified organic matter, and other properties associated with them.3) The soils on the northern part of the lower terrace (Tachikawa terrace) are presumably fluvial re-deposits in the earlier Jomon period, because a few small amount of gravel occur in the profiles. On the southern part of this terrace, about half of the soils are derived from typical aeolian deposits, and the other half are fluvial re-deposited Andosol.4) The soils on the lowest terrace (Aoyagi terrace) mostly contain gravel bed in the lower part of their profiles.
日本第四紀学会の論文

関東地方の台地黒ボク土の生成と地形発達に関する研究-1-多摩川扇状地西部における地形面と黒ボク土の特徴

スポンサーリンク

概要

著者

関連論文

スポンサーリンク