VARIATION OF RARE EARTH ELEMENT OF SOILS IN THE PROCESS OF SOIL FORMATION : A CASE-STUDY FOR TERRACE AND HILL SOILS IN BANGLADESH

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概要

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• Profile samples were collected from the soils on the terrace and hill areas in Bangladesh. Rare earth elements (REE), particle-size distribution, and mineralogical composition of the <2μm clay fraction were analyzed. The terrace soils showed an indication of moving/decomposition of clay particles from/in the surface horizons and the presence of different types of interstratified minerals in addition to mica in the clay fraction. Chondrite-normalized curves of REE indicated increase in the negative Eu anomaly towards the surface horizon. The hill soils were coarse-textured and dominated with kaolinite in the clay fraction, and showed a positive Ce anomaly in the A and B horizons. Among the REE a selective release of Eu and an enrichment of Ce in the process of soil formation was suggested.

• 日本粘土学会の論文

著者

• Egashira Kazuhiko

  Faculty Of Agriculture

• Yamasaki Shin-ichi

  Graduate School Of Environmental Studies Tohoku University

• ARAMAKI KOICHIRO

  Graduate School of Agriculture, Kyushu University

• YOSHIMASA MOTOHARU

  School of Agriculture, Kyushu University

• TAKEDA AKIRA

  Graduate School of Agricultural Science, Tohoku University

• YAMASAKI SHIN-ICHI

  Faculty of Agriculture, Tohoku University

• Takeda Akira

  Graduate School Of Agricultural Science Tohoku University

• Aramaki Koichiro

  Graduate School Of Agriculture Kyushu University

• Yoshimasa Motoharu

  School Of Agriculture Kyushu University

• Yamasaki Shin‐ichi

  Tohoku Univ. Sendai Jpn

• Yamasaki Shin-ichi

  Faculty Of Agriculture Tohoku University

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