Variations between weathered pumice particles of the Nantai-Shichihonzakura and Nantai-Imaichi tephra from polished sections

Masami Nanzyo, Hideaki Hirai, Kumiko Ito, Hitoshi Kanno

研究成果: Article査読

抄録

The oxalate-extractable Al (Alo) of weathered Nantai-Imaichi (Nt-IK) tephra sampled at Kiwadajima in Tochigi Prefecture, Japan is more than twice as high as that of weathered Nantai-Shichihonzakura (Nt-SK) tephra. This difference is peculiar because the Nt-IK horizon is directly under the Nt-SK tephra, without a buried A horizon in between, and the Nt-IK compares with the Nt-SK in age. The scanning electron microscopic image of the polished section of the pumice prepared from the Nt-SK tephra indicated the presence of weathered product, which would be allophanic altermorph of the thin bubble-wall glass as determined by energy-dispersive X-ray analyses. The unweathered thick bubble-wall glass was also present in the Nt-SK pumice typically accompanied with the weathered product as a thin film on the periphery. In contrast, the Nt-IK tephra lacks unweathered glass, with almost all glass converted to allophanic materials. One of the reasons for the high Alo value of the Nt-IK tephra compared with the Nt-SK is that the former has almost no unweathered glass whereas the latter has them inside the thick bubble-wall glasses.

本文言語English
ページ(範囲)693-701
ページ数9
ジャーナルSoil Science and Plant Nutrition
66
5
DOI
出版ステータスPublished - 2020

ASJC Scopus subject areas

  • 土壌科学
  • 植物科学

フィンガープリント

「Variations between weathered pumice particles of the Nantai-Shichihonzakura and Nantai-Imaichi tephra from polished sections」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル