…Secondary tectonites are further divided into S tectonites, which are dominated by planar structures, B tectonites, which are dominated by linear structures, and R tectonites, which are the result of deformation involving certain rotations. In contrast, primary tectonites are those in which the preferred orientation of rock structures occurs primarily during the formation of igneous or sedimentary rocks. However, there are cases in which it is difficult to determine whether a tectonite is primary or secondary, such as the preferred orientation that occurs during diagenesis of sediments. … *Some of the terminology that refers to "primary tectonite" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…二次テクトナイトはさらに,面状構造の卓越するSテクトナイト,線状構造の卓越するBテクトナイト,およびある種の回転を伴う変形の結果できるRテクトナイトに区分される。これに対して一次テクトナイトといわれるものは,岩石構造の定向配列が火成岩や堆積岩の生成時にできるような初生的な場合である。しかし,堆積物の続成作用でできる定向配列のように,一次,二次のいずれとも決めにくい場合もある。… ※「一次テクトナイト」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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