Architecture and evolution of an extensionally-inverted thrust (Monte Tancia thrust, central Apennines, Italy): geological, structural, geochemical, and K-Ar geochronological constraints
Deformation in the upper crust is heterogeneous and mostly localized along brittle faults. Faults and fault rocks may be weak compared to surrounding host rocks and are likely to accommodate repeated slip episodes due to structural reactivation during commonly fluid-assisted faulting events. Thrust fault reactivation by subsequent normal faulting has been commonly documented in orogenic wedges, where extensional tectonics often follows contraction.