The slab beneath the Alboran Sea is a consequence of the collision between two continents (Europe and Africa), which was initiated along the northeastern Spanish coast, experienced slab rollback and migrated to the area adjacent to the two continents. The tectonic background in this area includes episodes of collisions with adjacent continents as well as extension of those basins in the western Mediterranean. Here, we present three-dimensional (3D) Kirchhoff-approximate generalized Radon transform (GRT) images to further constrain the lithospheric structures previously identified by other researchers. The GRT images were calculated from the same P-to-S (Pds or Ps) teleseismic receiver functions (RFs) as the previous common conversion point (CCP) stacking, but the GRT data provide figures with greater resolution than the Pds RFs CCP results. This study indicates that the Alboran Slab may have completely detached from the crustal base under the western Betics Mountains and that a larger range of lithospheric ‘peeling off’ developed beneath the western part of the Betics Mountains than some previous results have claimed. The observed thin lithosphere under the Middle Atlas (MA) and eastern High Atlas (HA) may have a geodynamic relationship with lithospheric delamination under the eastern part of the Rif Mountains, which has also led to the thin lithosphere under the eastern Rif. According to the thick lithosphere under the western HA, the shallow LAB under the MA and eastern HA may have no heat-flow connection with the Canary mantle plume, as stated in several previous studies.

中文翻译：

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受 3D Kirchhoff 近似 GRT 成像约束的伊比利亚南部和摩洛哥北部岩石圈结构

阿尔伯兰海下的板块是两个大陆（欧洲和非洲）碰撞的结果，该碰撞始于西班牙东北部海岸，经历板块回滚并迁移到与两大洲相邻的地区。该地区的构造背景包括与邻近大陆的碰撞事件以及这些盆地在西地中海的延伸。在这里，我们提出了三维 (3D) 基尔霍夫近似广义 Radon 变换 (GRT) 图像，以进一步约束其他研究人员先前确定的岩石圈结构。GRT 图像是根据与之前的公共转换点 (CCP) 叠加相同的 P-to-S（Pds 或 Ps）远震接收器函数 (RFs) 计算得出的，但 GRT 数据提供的图像分辨率高于 Pds RFs CCP 结果. 这项研究表明，Alboran Slab 可能已经完全脱离了 Betics 山脉西部的地壳基底，并且 Betics 山脉西部下方的岩石圈“剥落”范围比之前的一些结果所声称的要大。中阿特拉斯（MA）和东高阿特拉斯（HA）下观测到的薄岩石圈可能与里夫山脉东部地区岩石圈分层存在地球动力学关系，这也导致了里夫东部地区岩石圈薄。前几项研究表明，根据 HA 西部下方较厚的岩石圈，MA 下方的浅层 LAB 和东部 HA 可能与 Canary 地幔柱没有热流联系。