Abstract: Three periods of structural stress fields can be recognized since Permian in Junggar Basin and adjacent areas based on structural evolution analysis, that is the end of Permian, the end of Jurassic (or lasting to the end of K1) and Neogene. Their maximum principal stress orientation are respectively NWW-NW, near SN, and NNE, which are derived from the occurrence data of the stress-response structures, i. e. , dykes, joints, slickensides, folds and faults. Furthermore, the authors simulated the stress field since Neogene based on 2D finite-element method, to deeply analyze the following questions: distribution and direction of stresses in the whole basin; influence of the geometry model for the stress field; as well as the dynamics of structures related to stress field.

Key words: Junggar Basin, structural stress fields, maximum principal stress, dyke, joints, folds

摘要： 通过构造地质演化分析, 将准噶尔盆地及周缘二叠纪以来具有较强构造变形的构造应力场分为 3 期: 二叠纪末、侏罗纪末( 或延续到早白垩世末) 和新近纪以来。根据岩墙、节理、擦痕、褶皱与断层等应力感构造的测量分析, 得出准噶尔盆地及周缘三期构造应力场的最大主应力方向分别为北西西-北西向、近南北向, 北北东向。基于对新近纪以来准噶尔盆地构造应力场的二维有限元模拟, 进一步对整个盆地应力场的分布特征、盆地边界几何形态对应力场的影响等问题进行了讨论与分析。

关键词: 准噶尔盆地, 构造应力场, 最大主应力, 岩墙, 节理, 褶皱