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根据地质、地震剖面、重力等资料及野外实地考察结果,分析了新疆吐哈盆地内各块体的力学性质和运动方式,在此基础上提出了吐哈盆地的发育模式。根据地质模型,并充分考虑了地质时间因素,建立了包括大区域平面模型、南北向剖面模型和台北凹陷三维模型等计算模型,用有限元数值计算方法模拟了古构造应力场和构造变形场。结果表明:吐哈盆地自侏罗纪以来一直受到近南北向的挤压,但盆地各段边界上的作用方向略有变化。模拟结果还显示出盆地的不对称形态以及主应力方向随深度的变化。
Based on the data of geology, seismic profile, gravity and field investigation, the mechanical properties and movement modes of each block in Turpan-Hami basin are analyzed. Based on this, the development model of Turpan-Hami basin is proposed. According to the geological model and considering the geologic time, the computational models including the large-area plane model, the north-south cross-section model and the three-dimensional model of the Taipei depression are established. The paleotectonic stress field and tectonic deformation field are simulated by finite element numerical method. The results show that the Turpan-Hami basin has been subjected to nearly north-south squeeze since the Jurassic, but the direction of the boundaries of each section of the basin has changed slightly. The simulation results also show the asymmetry of the basin and the direction of principal stress with depth.