Deformation features within an active normal fault zone in carbonate rocks: The Gubbio fault (Central Apennines, Italy)

We show that few of the observed structures can be attributed to an inherited shortening phase while the most abundant structures and fault rocks are related to extensional tectonics. The outcropping extensional patterns formed at depths less than 2.5-3 km, in a confined fluid system isolated from meteoric water, and the fault structures are the response to a small amount of cumulated displacement, 12-19% of the total geological throw.