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|Authors: ||Ascione, A.*|
|Title: ||The Plio-Quaternary uplift of the Apennine Chain: new data from the analysis of topography and river valleys in Central Italy|
|Title of journal: ||Geomorphology|
|Series/Report no.: ||1/102 (2008)|
|Issue Date: ||25-Mar-2008|
|Keywords: ||Morphometric analysis|
|Abstract: ||This study aimed at the reconstruction of magnitude and timing of uplift of a wide sector of the
Central Apennines (Italy) by means of morphometric and morphostructural analyses. In the internal
portion of the chain (where stratigraphic and geomorphological markers of past sea-level positions
are lacking) the study was based on analysis of erosional landforms and river valleys.
A large-scale topographic analysis was performed, processing 90-m and 230-m DEMs. The
spatial distribution of several morphometric parameters, together with characteristic wavelengths of
relief, allowed the distinction of three main regions affected by different cumulative surface uplift
and tectonic/erosional fragmentation: a Peri-Tyrrhenian Belt; an Axial Belt; a Peri-Adriatic Belt.
Particular attention was devoted to fluvial landforms, with analysis of longitudinal profiles and
geometric pattern of the main stream-trunks and their relations with major structures. Major
differences occur between the Tyrrhenian and Adriatic valley systems, the former being generally
longitudinal and showing overall concave-upward longitudinal profiles, whereas the latter are
generally transverse and possess less regular longitudinal profiles. Topographic features and river
valleys architecture seem related to different styles and amounts of uplift in the three Belts.
Within the study area, a narrower coast to coast transect (Gaeta-Vasto Transect, GVT) was
investigated in detail, devoting particular attention to its axial sector, lying around the Apennines
main divide (main divide area: MDA), and a possible scheme of the Quaternary surface uplift inside
this transect was proposed. In the MDA, the main stages of landscape evolution and river network
organization were reconstructed by analysis of paleosurfaces coupled with analysis of relic and
present-day hydrographic network. This allowed recognition of a major phase of surface uplift
(exceeding 1500 m in the Meta-Mainarde massif) occurred in response to thrusting during the
Pliocene, whereas for the Quaternary uplift a minimum value around 400 m was estimated.
Our study suggests that, during the Quaternary and in the GVT, the Peri-Tyrrhenian Belt
suffered a subdued uplift operating over small wavelengths (10-15 km), while Axial and Peri-
Adriatic Belts were subject to a stronger and long-wavelength (90 km) surface uplift, with
maximum values (about 700 m) shifted NE of the Axial Belt and tapering to zero towards the
Adriatic coast. The reconstructed pattern of uplift is coherent with the topographic properties of the
three Belts and with the observed drainage features.|
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