...When soils formed from sea or lake sediments containing pyrite FeS 2 dry up, the FeS 2 is oxidized to free sulfuric acid, resulting in a strong acidity (pH 3). The acid sulfate soils formed in this way contain basic ferric sulfate compounds such as jarosite KFe 3 (SO 4 ) 2 (OH) 6, and are yellow like cat droppings, so they are also called cat clays. Various soil types belonging to the Vertisol order exist in the microdepressions of areas of basic rocks and calcareous rocks in the tropics and subtropics. ... *Some of the terminology that mentions "Cat Clay" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…パイライトFeS2を含む海底または湖底の堆積物から生成した土壌が乾陸化すると,FeS2が酸化されて遊離の硫酸が生じ強酸性(pH3)になる。このようにして生成した酸性硫酸塩土壌はジャロサイトKFe3(SO4)2(OH)6などの塩基性硫酸第二鉄化合物を含むためネコの糞のような黄色を呈するのでキャット・クレイともよばれる。 熱帯・亜熱帯の塩基性岩や石灰質岩からなる地域の微凹地にはバーティソル目に属する種々の土壌型が存在する。… ※「キャット・クレイ」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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