...When used qualitatively as a name in the field, it may be judged to be finer than it actually is. In terms of mineral composition, it is divided into wacke (more than 75% is mudstone) when the cement (mud matrix) is 15-75%, and arenite when it is 15% or less, and further subdivided according to the ratio of quartz, feldspar, and rock fragments. Arkose is arenite that contains a large amount of feldspar and quartz, and refers to sandstone that was transported from granite or gneiss areas. ... *Some of the terminology explanations that mention "arenite" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…野外での呼称として定性的に使用している場合には,実際より細粒に判定していることがある。鉱物組成による分類では,膠結分(泥質基質)が15~75%までをワッケwacke(75%以上は泥岩),15%以下をアレナイトareniteに分け,さらに石英,長石,岩片の量比によって細分する。アルコースarkoseとは長石,石英を多量に含むアレナイトで,花コウ岩や片麻岩地帯から運ばれてできた砂岩をいう。… ※「arenite」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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