Microlith

Japanese: microlithon
Microlith

...The former is often seen when fine-grained rocks such as slate, which do not contain much hard and brittle layers such as sandstone (called competent layers), are deformed at medium depths, as described below, and generally results in cleavage folding. The folding units in this case are rock fragments (called microlithons) several tens to several hundreds of micrometers thick, bounded by slate cleavages (axial cleavages) that are almost parallel to the folding axis. Imagine pushing a stack of cards vertically with your finger.

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…前者は,砂岩など固くてもろい地層(コンピテントcompetent層という)をあまり含まないスレートなど細粒岩が後述のように中深度で変形した場合に多く見られ,一般にはへき開褶曲となる。このときの褶曲単位は,褶曲軸面にほぼ平行なスレートへき開(軸面へき開)によって境された厚さ数十~数百μmの岩片(マイクロリソンmicrolithonという)である。重ねたカードを縦の方向から指で押した場合を想像してもらえばよい。…

※「microlithon」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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