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The Aladağ melange is located between Mesozoic Tauride carbonate platform units and the Late Cretaceous Pozantı-Karsantı ophiolite and its metamorphic sole. The melange comprises a lower, mainly sedimentary unit, composed of variably disrupted thrust sheets of deep-sea sediments, with a localized matrix of mass-flow and turbidity current deposits. The upper, volcanic-sedimentary melange comprises highly disrupted basalt-pelagic carbonate-radiolarite units, rarely associated with gravity-flow deposits. Tholeiitic to alkaline basalts in the melange range from N-MORB, to E-MORB and to OIB, and are dated as Middle Jurassic to Early Cretaceous using Radiolaria from interbedded pelagic sediments. Comparisons with accretionary melanges throughout southern Turkey and elsewhere indicate a similar geochemical pattern of variable ‘enrichment’, commonly coupled with a subduction influence (e.g. negative Nb, Ta anomalies). Geochemically, the subduction-influenced basalts are consistent with an oceanic island arc origin. However, the geological setting of Triassic basalts within some of the melanges (e.g. Mersin) is indicative of a rifted continental margin setting. The Mesozoic basalts within the Turkish melanges considered here erupted along the distal, outer northern margin of the Tauride continent, followed by Late Cretaceous subduction-accretion and supra-subduction zone ophiolite emplacement. Regional to global chemical comparisons suggest that the subduction influence could represent geochemical subduction inheritance rather than contemporaneous subduction.

international geology review

Role of Late Cretaceous volcanic-sedimentary melanges, specifically the Aladağ melange, E Turkey, in the rift-drift-subduction-accretion-emplacement history of the Tethyan Inner Tauride ocean