Publication Date:
2022-05-24
Description:
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
Description:
Published
Description:
312-321
Description:
2TR. Ricostruzione e modellazione della struttura crostale
Description:
JCR Journal
Keywords:
thermal modelling
;
low-angle normal faults
;
Northern Apennines
;
04.07. Tectonophysics
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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