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当上地壳变形发生在斜向会聚和挤入构造起主要作用的构造环境中时,三种变形方式是普遍的:收缩、横推运动和块体转动。收缩变形导致褶皱作用和逆断作用,使经受缩短的上地壳增厚,并发育了巨大挤压带和前陆盆地。横推变形作用导致先前无关的区段并置,同时发育局部挤压的山脉和盆地。块体转动可产生横向挤出并促进盆地形成(Souriot等,1992)。 这些主要变形方式在碰撞山脉带的渐进变形期间可以按不同比例出现在一起。本文中我们总述了这三种构造方式(收缩、横推和块体转动)的某些特征,并指出它们的互补性和在区域构造上的共同控制因素,这是以台湾东北部碰撞带的实例为依据的(图1)。
Three deformations are common when the deformation of the crust occurs in a tectonic setting where the convergence and crustal play a major role: shrinkage, lateral thrusting and block rotation. Shrinkage deformations lead to fold and thrust discontinuities that thicken the shortened upper crust and develop massive crustal and foreland basins. Transverse deforming results in the juxtaposition of previously unrelated sections while developing locally extruded mountains and basins. Block rotation can produce lateral extrusion and promote basin formation (Souriot et al., 1992). These major deformations can appear together in different proportions during the progressive deformation of the collision belt. In this paper, we summarize some of the features of the three tectonic modes (shrinkage, lateral thrusting and block rotation) and point out their complementarity and common control over regional tectonics based on the collision zone Based on the example (Figure 1).