Publication Date:
2021-12-16
Description:
In extending areas undergoing regional tectonic uplift, the persistence of subsidence at a normal-fault
hanging-wall depends on the competition between regional and local tectonic effects. When regional
uplift exceeds the subsidence of the hanging-wall block, denudation prevails at both the hanging-wall
and the foot-wall. When local tectonic subsidence exceeds regional uplift, sedimentation occurs over
the hanging-wall block, supplied by foot-wall erosion. We analyzed a PlioceneeQuaternary continental
basin, currently crossed by the Tiber River in Italy. The tectono-sedimentary evolution of the basin
developed at the hanging-wall of a regional low-angle extensional detachment, the Alto Tiberina Fault, in
the axial region of the Northern Apennines of Italy. This area is affected by regional uplift on the order of
0.5e1.0 mm/yr. The present-day activity of the fault is revealed by both microseismicity and geodetic
(GPS) data. We investigated the mid- (10e100 ka) and long-term (0.5e3.0 Ma) evolution of the three
depocenters by studying the continental Pleistocene succession infilling the basin as well as fluvial
terraces and higher paleosurfaces carved into the Pleistocene deposits.
By using surficial geologic data and an interpretation of a set of seismic reflection profiles, we show
that the three depocenters experienced a fairly similar evolution during the PlioceneeEarly Pleistocene,
when a 1000-m-thick continental succession was deposited. On the contrary, geomorphological observations
indicate that, at the beginning of the Middle Pleistocene, a switch occurred in the evolution of the
three depocenters. In the northernmost Sansepolcro sub-basin, bounding normal faults are active and
hanging-wall subsidence outpaces regional uplift. Concurrently, in the Umbertide and Ponte Pattoli subbasins
uplift dominates over the hanging-wall subsidence, promoting river incision and exhumation of
the Pleistocene deposits. For these two depocenters, by means of terrace-river correlations, we estimate
that the incision rate is ~0.3e0.35 mm/yr, suggesting a maximum tectonic subsidence of 0.2 mm/yr.
The identification of a heterogeneous uplift pattern along the hanging-wall of the Alto Tiberina Fault,
driven by different displacement rates of its fault splays, allowed us to characterize fault segments with
different activities and, possibly, different seismic behaviors.
Description:
Published
Description:
111-132
Description:
2T. Tettonica attiva
Description:
JCR Journal
Description:
restricted
Keywords:
Quaternary basin
;
normal fault
;
04. Solid Earth::04.04. Geology::04.04.01. Earthquake geology and paleoseismology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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