Abstract It is unclear how the crustal-scale erosional exhumation of continental domains of the Moroccan Atlantic margin and the excessive subsidence of its rifted domains affected the Late Jurassic-Early Cretaceous post-rift evolution of the margin. To constrain the km-scale exhumation, we study the structural evolution of the Jbel Amsittene. This anticline is located on the coastal plain of the Moroccan Atlantic margin, and is classically considered to have been developed initially in the Late Cretaceous by halokinesis, and by contraction during the Neogene. Contrarily, our structural analysis indicates that the anticline is a fault-propagation fold verging north with Triassic salts at its core and that it formed by shortening shortly after continental breakup of the Central Atlantic. The anticline grew by NNW-SSE to NNE-SSW contraction, as shown by syn-tectonic wedges, regional kinematic indicators and synsedimentary structures in Upper Jurassic to Lower Cretaceous rocks. It grew further and tightened during the Cenozoic, presumably in relation to the Atlas/Alpine contraction. Thus, our data and interpretation suggest that “tectonic-drives-salt” in the anticline early growth, which is coeval with the growth of other anticlines along the Moroccan Atlantic margin and widespread km-scale exhumation farther onshore. Anticline growth due to shortening argues for intraplate far-field stresses potentially linked to the geodynamic evolution of the African, American and European plates.

中文翻译：

---

摩洛哥大西洋边缘地壳剥脱过程中因缩短而导致的背斜生长

摘要 目前尚不清楚摩洛哥大西洋边缘大陆域的地壳尺度侵蚀剥落及其裂谷域过度下沉对晚侏罗世-早白垩世边缘裂谷后演化的影响。为了限制公里尺度的挖掘，我们研究了 Jbel Amsittene 的结构演化。该背斜位于摩洛哥大西洋边缘的沿海平原上，经典地认为最初是在晚白垩世通过晕轮作用和新近纪期间的收缩形成的。相反，我们的结构分析表明，背斜是一条向北靠近的断层传播褶皱，其核心是三叠纪盐，它是在中大西洋大陆分裂后不久缩短形成的。背斜由 NNW-SSE 增长到 NNE-SSW 收缩，如上侏罗统至下白垩统岩石的同构造楔形、区域运动学指标和同沉积结构所示。它在新生代期间进一步增长并收紧，大概与阿特拉斯/阿尔卑斯山的收缩有关。因此，我们的数据和解释表明，背斜早期生长中的“构造驱动盐”，这与沿摩洛哥大西洋边缘的其他背斜的生长以及更远的陆上广泛的千米级剥落同时发生。由于缩短而导致的背斜增长认为板内远场应力可能与非洲、美洲和欧洲板块的地球动力学演化有关。大概与 Atlas/Alpine 收缩有关。因此，我们的数据和解释表明，背斜早期生长中的“构造驱动盐”，这与沿摩洛哥大西洋边缘的其他背斜的生长以及更远的陆上广泛的千米级剥落同时发生。由于缩短而导致的背斜增长认为板内远场应力可能与非洲、美洲和欧洲板块的地球动力学演化有关。大概与 Atlas/Alpine 收缩有关。因此，我们的数据和解释表明，背斜早期生长中的“构造驱动盐”，这与沿摩洛哥大西洋边缘的其他背斜的生长以及更远的陆上广泛的千米级剥落同时发生。由于缩短而导致的背斜增长认为板内远场应力可能与非洲、美洲和欧洲板块的地球动力学演化有关。