The relationship between the North and South China blocks, particularly their spatial-temporal framework and evolutionary history, has been widely debated. We conducted a comprehensive study of the structural geometry and kinematics of the thrust belts in the intersection zone between the Dabashan and eastern Sichuan Basin based on seismic data, drilling data, field investigation data, and zircon and apatite (U-Th)/He thermochronology data. These data sets provide important insights into the relationship between the North and South China blocks during the post-orogenic process. Due to the detachments, the strata of the eastern Sichuan Basin can be divided into four structural intervals characterized by duplex structures and fault-related fold structures. Balanced restoration indicates the vertical differences are represented by the shortening ratio of the upper structural interval of ∼6%, that of the middle ∼10%, and that of the lower ∼7%. Besides, the shortening ratios indicate an increasing tendency of the deformation intensity from the west to the east. The (U-Th)/He dating results suggest two age ranges, i.e., from 180 Ma to 130 Ma and from 50 Ma to 20 Ma, respectively. These age data sets also imply a younger tendency westward. The intersection zone may have experienced the following stages since the late Mesozoic era: (1) the stable continental sedimentation stage from the Late Triassic to the Late Jurassic epochs; (2) the continuous thrust stage from the Late Jurassic to the early Paleogene epochs, which is associated with the subduction of the Paleo-Pacific Ocean; and (3) the uplift and denudation stage as a whole caused by the uplift of the Tibetan Plateau since the Paleogene period.

中文翻译：

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华南地块大巴山与四川盆地东部逆冲带的构造几何学和运动学：(U-Th)/He定年和地震资料的约束

华北和华南区块之间的关系，特别是它们的时空框架和演化历史，一直受到广泛争论。基于地震资料、钻井资料、野外调查资料以及锆石和磷灰石（U-Th）/He热年代学，对大巴山与川东交汇带逆冲带的构造几何学和运动学进行了综合研究。数据。这些数据集为后造山过程中华北地块和华南地块之间的关系提供了重要的见解。由于拆离作用，川东地层可划分为以复式构造和断层褶皱构造为特征的四个构造层段。平衡恢复表明垂向差异表现为构造层上部～6%、中部～10%、下部～7%的缩短率。此外，缩短比表明变形强度从西向东有增加的趋势。(U-Th)/He 测年结果表明两个年龄范围，即分别从 180 Ma 到 130 Ma 和从 50 Ma 到 20 Ma。这些年龄数据集也意味着向西更年轻的趋势。交汇带自晚中生代以来可能经历了以下几个阶段：（1）晚三叠世至晚侏罗世大陆稳定沉积阶段；(2) 晚侏罗世至古近纪早期的连续逆冲期，与古太平洋俯冲有关；