Abstract The structural deformation of the eastern Sichuan Basin, South China, is characterized by a thin-skinned fold-and-thrust belt with exposed, approximately parallel narrow anticlines and wide synclines. A 196-km long regional cross section has been constructed parallel to the shortening direction to analyze structural styles and evolution of the fold-thrust belt. The stratigraphic succession is composed of competent layers separated by three main incompetent layers which act as detachments. The basal detachment, the Cambrian evaporites, played a dominant role in the deformation; the middle and top detachments accommodated the displacement during deformation. Structural styles are dominated by faulted detachment folds with the breakthroughs of the fore- and/or backlimbs. Balanced restoration shows that the shortening between basal and top detachments is about 26 km with the shortening ratio of 12.4–18.6%. Integrated analyses of kinematics and balanced restoration reveal the evolution succession of kink bands, detachment folds, and faulted detachment folds. Kink bands initiated and evolved into detachment folds above the basal detachment as the shortening took place; with progressive shortening the back- and/or forelimbs of these folds developed thrusts.

中文翻译：

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四川盆地东部多拆离薄皮褶皱逆冲带构造样式及演化

摘要 四川盆地东部构造变形以薄皮褶皱逆冲带出露、近似平行的窄背斜和宽向斜为特征。平行于缩短方向构建了196km长的区域断面，分析了褶皱冲断带的构造样式和演化。地层序列由三个作为拆离作用的主要不合格层分隔的合格层组成。基底拆离寒武系蒸发岩在变形中起主导作用；中间和顶部的分离适应变形过程中的位移。结构样式以前肢和/或后肢突破的断层分离褶皱为主。平衡恢复表明，基底和顶部拆离间的缩短约26 km，缩短率为12.4-18.6%。运动学和平衡恢复的综合分析揭示了扭结带、拆离褶皱和断层拆离褶皱的演化序列。随着缩短的发生，扭结带开始并演变为基底分离上方的分离褶皱；随着这些褶皱的后肢和/或前肢逐渐缩短，产生了推力。