滚动背斜形成演化机制——基于构造物理模拟分析

Formation and evolution mechanism of rolling anticline: Based on structural physics simulation analysis

作为正断层相关褶皱的构造样式之一,滚动背斜是指在生长断层活动时由于两盘之差异压实作用和下降盘沉积层的重力作用形成的弧形弯曲,其主控断裂为上陡下缓的犁式铲状正断层,几何形态受断层面及上盘岩层充满潜在空间机制的控制[1]。作为同生断层有关的伴生构造,对于滚动背斜的成因探讨具有重要实际意义。文章通过构造物理模拟实验,对滚动背斜的形成演化机制进行分析,得出以下结论:(1)滚动背斜的形成所处构造应力环境为拉张环境;(2)滚动背斜主要受主断裂(正断层)控制,属于正断层相关褶皱。

As one of the structural styles of the normal fault-related folds, the rollover anticline refers to the arc bending caused by the difference between the compaction of the two plates and the gravitational action of the descending plate. It is mainly controlled by the plow-type shovel-shaped normal fault, which characterized by the upper part of the steep lower part of the slow, its geometry by the fault plane and the fault layer on the plate layer filled with potential space control. It is of great practical significance to explore the genesis of the rollover anticline. In this paper, the formation and evolution mechanism of rollover anticline is analyzed by constructing physical simulation experiment, and the following conclusions are drawn：（1） The tectonic stress environment of the rollover anticline is the tensional tectonic background;（2） The main anticipation of the rollover anticline is controlled by the normal fault, which belonging to the normal fault-related folds.