Red clay

Japanese: red clay(英語表記)redclay
Red clay

…It occupies 28% of the total ocean surface area and is distributed on the ocean floor at depths of 4,500 to 7,000 meters, gradually changing into calcareous mud at shallower depths. Its color is reddish brown or chocolate brown, and it was called red clay, but recently the official name brown clay has been used. Its color is due to hydroxides of iron and manganese, because it is formed on the ocean floor in an oxidizing environment. …

*Some of the terminology that refers to "red clay" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…それは全海洋面積の28%を占め,水深4500~7000mの大洋底に分布し,それより浅くなると石灰質軟泥に漸移する。その色は赤色がかった褐色ないしチョコレート色を帯びた褐色で,赤粘土red clayと呼ばれたが,最近は褐色粘土brown clayが正式に使用されている。その色は鉄とマンガンの水酸化物によるもので,酸化環境の海底で生じたためである。…

※「red clay」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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