中生代焉耆盆地双侧斜向挤压-基底收缩成因

砂箱实验模拟是研究盆地形成机制的重要手段。根据焉耆盆地平面与剖面构造特征设计了砂箱实验模型。基于对实验结果分析，认为中生代焉耆盆地是SW-NE方向的双侧斜向挤压作用下基底收缩形成的盆地。盆地内部不同方向的断层形成于同一挤压变形过程。焉耆盆地边界方向、水平挤压方向和基底收缩作用控制盆地内部构造带的方向。焉耆盆地的形成并非一定是边界走滑活动或拉分作用叠加的结果。该实验模型为解释焉耆盆地的构造成因机制提供了证据。图5参14

The formation of two-sides oblique compression and substrate contraction of Mesozoic Yanqi Basin

The Sandbox models were designed from the typical structures of the plane and profile in Yanqi Basin northwest China. The experimental results show that the Yanqi Basin can be interpreted as one caused by the deformation of the two-sides oblique compression in a SW-NE direction and substrate contraction. The faults in different orientations in the basin were caused by the same compression deformation. The basin's boundary direction, the horizontal compression direction and the substrate contraction controlled the direction of the structural zones. It is not certain that the structural patterns in Yanqi Basin were caused by the superposition of the strike-slip of the boundary or pull-apart deformations. The experimental model can provide evidence for interpreting the mechanisms of tectonics in Yanqi Basin.