Journal
TERRA NOVA
Volume 27, Issue 4, Pages 312-321Publisher
WILEY
DOI: 10.1111/ter.12163
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Funding
- Miur-Prin Project
- Miur
- 'Roma Tre' Doctoral School in Geology of Territory and Resources
- 'Roma Tre' University research funds
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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 3.8Ma, the ATF footwall has exhumed at rates of 0.90mma(-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 4km. 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.
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