Slab bending, syn-subduction normal faulting, and out-of-sequence thrusting in the Central Apennines

作者: Eugenio Carminati , Simone Fabbi , Massimo Santantonio

DOI: 10.1002/2013TC003386

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摘要: In the Central Apennines, a Tertiary-Present eastward-vergent fold and thrust belt, thrusting mainly occurred in-sequence, cutting across Mesozoic to Early Neogene succession, deposited in rifted (Early Jurassic) passive continental margin, foredeep (late Miocene) conditions. However, Simbruini Mts were characterized by occurrence of regional out-of-sequence thrusts (the Vallepietra-Filettino-Monte Ortara fault) ofTertiary prethrusting normal faults, associated with deposition thick breccia deposits (Brecce della Renga, Tortonian-early Messinian). A direct link between these two features is here proposed. Evidence for faulting origin Brecce Renga amply discussed. Although evidence subduction-related growing Apennines literature, nowhere region are known extensional systems so vast their syn-tectonic as area. We propose that faults subduction related, i.e., they developed foreland due anomalous bending lithosphere subducting Late Tertiary time under The subsequently deformed during development front. speculate allowed penetration fluids within crust possibly also mantle, weakening this part plate. As consequence, weaker plate was anomalously down-bent, leading subcritical state wedge. scale order bring wedge back critical state.

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