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. Progress in the understanding and dating of the sedimentary record of the Alboran Basin allows us to propose a model of its tectonic evolution since the Pliocene. After a period of extension, the Alboran Basin underwent a progressive tectonic inversion starting around 9–7.5 Ma. The Alboran Ridge is a NE–SW transpressive structure accommodating the shortening in the basin. We mapped its southwestern termination, a Pliocene rhombic structure exhibiting series of folds and thrusts. The activeAl-Idrissi Fault zone (AIF) is a Pleistocene strike-slip structure trendingNNE–SSW. The AIF crosses the Alboran Ridge and connects to the transtensiveNekor Basin and the Nekor Fault to the south. In the Moroccan shelf and atthe edge of a submerged volcano we dated the inception of the localsubsidence at 1.81–1.12 Ma. The subsidence marks the propagation of the AIFtoward the Nekor Basin. Pliocene thrusts and folds and Quaternarytranstension appear at first sight to act at different tectonic periods butreflect the long-term evolution of a transpressive system. Despite theconstant direction of Africa–Eurasia convergence since 6 Ma, along thesouthern margin of the Alboran Basin, the Pliocene–Quaternary compressionevolves from transpressive to transtensive along the AIF and the NekorBasin. This system reflects the logical evolution of the deformation of theAlboran Basin under the indentation of the African lithosphere.

Plio-Quaternary tectonic evolution of the southern margin of the Alboran Basin (Western Mediterranean)