Provenance Analysis of the Ojén Nappe and Its Implication for the Geodynamic History (Alpujárride Complex, Betic Cordilleras, Spain)

The Ojén nappe, an allochthonous unit that underlies the Ronda peridotites (Betic Cordilleras), is composed of Triassic marbles overlying a metapelitic sequence. In order to carry out LA-ICP-MS U-Pb age determination and provenance analysis, detrital zircon grains from two quartzites interlayered within metapelites were extracted. obtained results yield youngest population 254 ± 3 Ma (Late Permian) with mean Th/U ratio 0.34 supports both Permian–Triassic marble member felsic magma nature for zircon-bearing protoliths. Permian zircons exhibit tight peaks in three main populations 292 2 Ma, 278 agreement reported rhyolites shallow crustal basaltic–andesite subalkaline rocks emplaced transtensional basins Variscan Orogen during break-up Pangea. Moreover, analyzed distributions clear Tonian–Stenian (ca. 950–975 Ma), Ediacaran–Cryogenian 560–615 Ordovician 460–465 Cisuralian 280–290 Ma) smoothed Mesoproterozoic point weak residual Cadomian peri-Gondwanan terrane inheritance. identified Middle (460–465 strengthen hypothesis Alborán domain would be located along southern passive margin European Hunic superterrane.