Alpine inversion of the North African margin and delamination of its continental lithosphere

作者: François Roure , Piero Casero , Belkacem Addoum

DOI: 10.1029/2011TC002989

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摘要: [1] This paper aims at summarizing the current extent and architecture of former Mesozoic passive margin North Africa from Algeria in west up to Ionian-Calabrian arc adjacent Mediterranean Ridge east. Despite that most paleogeographic models consider Eastern Basin as a whole is still underlain by remnants Permo-Triassic or younger Cretaceous Tethyan-Mesogean ocean, strong similarities documented here structural styles timing inversion between Saharan Atlas, Sicilian Channel Ionian abyssal plain evidence this portion belongs distal African continental margin. A rim Tethyan ophiolitic units can be also traced more less continuously Turkey Cyprus east, onshore Crete, Pindos Greece Mirdita Albania, well Western Alps, Corsica Southern Apennines west, supporting hypothesis both Apulia/Adriatic domain belong southern Tethys. Because there no clear crustal-scale fault offsetting Moho, but likely continuous yet folded Moho extending foreland hinterland beneath arcs, we propose new model delamination lithosphere for Aegean arcs. In model, only mantle Apulia locally subducted recycled asthenosphere, if not all northern crust coeval being currently decoupled its former, delaminated lithosphere.

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