Crustal extension in the northern Apennines: The transition from compression to extension in the Alpi Apuane Core Complex

摘要: An interpretation of Northern Apennine geology is presented which relates the temporal and spatial occurrence both compressional extensional deformation features in terms changing dynamic evolution within an accretionary wedge, after a model proposed by Platt [1986], followed initiation development continental rifting. During Cretaceous to Eocene time wedge formed as remnant Tethyan oceanic crust subducted beneath rotating Corsica-Sardinia microplate. Microplate collision during Oligocene was characterized rapid imbrication buoyant Italian margin, record preserved duplex structure geometry Alpi Apuane region. The overthickened returned more stable configuration developing Miocene: listric normal faults at upper-crustal levels shear zones indicating evidence distributed ductile strain mid-crustal are recorded. It that large-scale regional extension with associated volcanism beginning Messinian represented intrusion asthenospheric material from plate into already attenuated complex. Further rifting, perhaps aided subduction back arc processes Southern Apennines, led formation Tyrrhenian Sea basin. Both Apennines North American core complexes crustal thickening thinning, finally This suggests similar histories these regions vastly different tectonic settings may be explained linked internal dynamics wedges.