准噶尔盆地南缘构造物理模拟实验

根据准噶尔盆地南缘地质构造特征和相似理论 ,成功地设计并进行了两组实验 :①利用砂箱模拟了该区剖面中可见的三排背斜带以及背斜紧闭、向斜开阔的特征 ;②利用湿粘土模拟了南缘几排背斜带与边界断裂斜交成“入”字型的平面特征 ,对西南缘存在东、西分段性的形成机制给予了很好的解释。模拟实验结果表明 ,压扭性走滑作用可以产生准噶尔盆地南缘的复杂构造现象 ,在右行压扭的区域动力学背景下可以产生与主位移带呈高角度斜交的张扭性断裂 ,以此可以解释南缘地区东、西分带的原因

Physical simulation experiment on geological structures in the south of Juggar Basin

According to the geological structural model and analogue theory, two groups of experiments for complicated fold fault blocks of Juggar Basin were performed with a new apparatus SG 2000. The first group is to utilize sand boxing model. The experimental results of cross section of anticline indicated that compress could cause this structure of three closing anticlines and open synclines. In the second experiment, clay was used to simulate the features of plane inclined by some anticline belts and faulted belts in the southern edge of the basin. The simulation has given a reasonable explanation for the causing system of the east and west subsections in this area. The compression and shear actions could result in the patterns of thrust anticline structure in the southern Junggar Basin. The experimental results can provide an evidence for learning the assemblage and mechanism of these complicated structures.