Exhumation patterns along shallow low‐angle normal faults: an example from the Altotiberina active fault system (Northern Apennines,Italy) |
| |
| Authors: | Chiara Caricchi Luca Aldega Massimiliano R Barchi Sveva Corrado Domenico Grigo Francesco Mirabella Massimiliano Zattin |
| |
| Institution: | 1. Dipartimento di Scienze, Sezione di Scienze Geologiche, Università ‘Roma Tre’, Roma, Italy;2. Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy;3. Dipartimento di Scienze della Terra, Sapienza Università di Roma, Roma, Italy;4. Dipartimento di Fisica e Geologia, Università degli Studi di Perugia, Perugia, Italy;5. Eni SpA – Exploration & Production Division, San Donato Milanese (MI), Italy;6. Dipartimento di Geoscienze, Università degli Studi di Padova, Padova, Italy |
| |
| Abstract: | A multi‐method approach (palaeothermal and thermochronological analyses; thermal modelling) is applied to reconstruct the exhumation history of the Altotiberina Fault (ATF), a representative example of crustal‐scale active low‐angle normal faulting in the Northern Apennines (Italy). Thermal maturity and thermochronological data yield similar burial histories but different exhumation patterns for the sedimentary successions in the hangingwall and the footwall of the ATF. Since 3.8 Ma, the ATF footwall has exhumed at rates of 0.90 mm a?1. Exhumation led to bending and deactivation of the ATF uppermost portion as a result of tectonic unloading and isostatic adjustment, followed by migration of extension and the development of a set of domino‐like, east‐dipping normal faults, rooting on the buried portion of the ATF. ATF activity and isostatic rebound exhumed Triassic rock units from depths of about 4 km. We suggest that isostatic instability is accommodated at shallow crustal levels, in a similar way to what is observed on larger structures at mid‐low crustal levels. |
| |
| Keywords: | |
|
|
