広島県東部,世羅台地における風化について
1986 年 17 巻 Special 号 p. 41-46
詳細
1986 年 17 巻 Special 号 p. 41-46
The Sera Plateau is characterized by deep weathering of various geological units. Mineralogical examinations of clay minerals produced by weathering processes reveal the following characteristics. (1) Halloysite and kaolinite are commonly observed in the weathered zones of granitic rocks, rhyolitic and a.ndesitic rocks. (2) Kaolinite is predominant in the reddish weathered zone. (3) Smectite develops in the lower part of the Kodachi gravels. The deep weathering crusts in the Sera Plateau are, most probably, formed under the condition of humid and temperate climate during the Pliocene and the Pleistocene epochs.
