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一、褶皱形成基本条件的分析 褶皱是重要而常见的构造现象之一。尽管褶皱大小悬殊、形态各异,但其形成则主要由下述两个基本条件所决定: 1.褶皱的岩层必须具有良好的成层性,以促使岩层的层面间,尤其是不同岩性或岩性组合的分界面之间的相对滑动和流动。正由于这种层间剪切滑动面和褶皱岩层上部一面临空自由空间的存在,为各种类型褶皱的形成,提供了重要的构造前提。 2.成层的岩石必须在一定方式、方向的外力作用的条件下,当由外力所决定的侧向
First, the analysis of the basic conditions of fold formation Folds is one of the important and common structural phenomena. Although the folds vary in size and shape, their formation is mainly determined by two basic conditions: 1. Pleat strata must have good stratification to promote the formation of layers of rock, especially different lithologies or Relative slippage and flow between interfaces of lithologic assemblages. Due to the existence of such interlaminar shear sliding surface and free space in the upper part of the fold strata, it provides an important structural prerequisite for the formation of various types of folds. 2. Stratified rock must be in a certain way, the direction of the external force under the conditions of the lateral force of the decision