愛鷹ローム層を母材とする累積性火山灰土の粘土鉱物

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概要

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• The clay mineralogical composition of the recent and buried soils derived from the upper column of the Quaternary tephras were analysed by means of the DTA and X-ray diffraction.The uppermost humified scoriaceous soils were characterized by allophane and Al-vermiculite. No gibbsite was detected. The middle part ranging from the uppermost Pleistocene to the recent was composed of fine and coarse (scoriaceous) tephras of various petrographic compositions and humified horizons on them. Al-vermiculite and kaolinite were dominant components of the -2μ fractions of these horizons. Gibbsite and 14Å/10Å intergrades were accompanied. The clay mineralogy of the lower part (upper Pleistocene) was dominated by allophane.These results suggest that the weathering sequence of primary minerals of these tephras may follow the following stages.Volcanic glass→crystalline clay minerals (Al-vermiculite and kaolinite) with gibbsite →allophane.

• 日本第四紀学会の論文

著者

• 斎藤 賢一

  群馬県立富岡高校

• 松井 健

  (株) 地域開発コンサルタンツ

関連論文

• 成増付近の関東ローム層の粘土鉱物
• 愛鷹ローム層を母材とする累積性火山灰土の粘土鉱物
• このシンポジウムの趣旨 (大規模土地改変と第4紀研究)

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