Abstract The Kuqa depression is associated with complex salt structures. Variation in fold geometries and subsalt fault activities were investigated using parallel cross-sections to reveal detailed along-strike variations within the Keshen 5 segment and their controlling factors. Along-strike variations were identified in both suprasalt and subsalt units. Linkages, such as the location of a transfer zone, were apparent, while the distribution of variations above and below the salt layer were decoupled. The results indicate that the pre-existing salt wall is the key factor driving along-strike variations because it acts as a weak zone that influences deformation propagation. Suprasalt structural variation results in different sediment depths, which have a significant impact on subsalt fault activity. In the eastern segment, fault activity decreases from the hinterland to the basin. In contrast, owing to the pre-existing salt wall and deep sedimentation near the hinterland in the western segment, the fault beneath the salt wall is characterized by maximum displacement. This study reveals the connection between suprasalt and subsalt deformation and the role of that a salt diapir plays in along-strike structural evolution variations for the Keshen 5 segment of the Kuqa depression. These findings are relevant for understanding along-strike deformation propagation and structural variation in other fold and thrust systems.

中文翻译：

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盐影响褶皱逆冲带的沿走向构造变异：库车坳陷分析

摘要 库车坳陷与复杂的盐结构有关。使用平行横截面研究褶皱几何形状和盐下断层活动的变化，以揭示克深 5 段内详细的沿走向变化及其控制因素。在盐上和盐下单元中都发现了沿走向的变化。联系，例如转移区的位置，是显而易见的，而盐层上方和下方的变化分布是分离的。结果表明，预先存在的盐壁是驱动沿走向变化的关键因素，因为它是影响变形传播的薄弱带。盐上构造变异导致沉积物深度不同，对盐下断层活动有显着影响。在东段，断层活动从腹地向盆地递减。相比之下，由于西段腹地附近已存在盐壁和深层沉积，盐壁下的断层具有最大位移特征。本研究揭示了盐上和盐下变形之间的联系以及盐底辟在库车坳陷克深5段沿走向构造演化变化中的作用。这些发现与理解其他褶皱和推力系统中的沿走向变形传播和结构变化有关。本研究揭示了盐上和盐下变形之间的联系以及盐底辟在库车坳陷克深5段沿走向构造演化变化中的作用。这些发现与理解其他褶皱和推力系统中的沿走向变形传播和结构变化有关。本研究揭示了盐上和盐下变形之间的联系以及盐底辟在库车坳陷克深5段沿走向构造演化变化中的作用。这些发现与理解其他褶皱和推力系统中的沿走向变形传播和结构变化有关。