The Quaternary marks a time of important change in the tectonic regime that affected the central Apennine chain. The shift from the late Miocene-early Pliocene compressional regime to the late Pliocene-early Pleistocene extensional regime produced surface uplift of the chain, tectonic activity expressed along normal faults, and rapid evolution of the intra-montane basins. The development of several paleosurface levels in the central Apennines suggests the uplift was not constant through time; dating those paleosurfaces is critical for determining how uplift rates and landscapes changed through time. The Aterno and Tirino basins preserve a record of subplanar highlands that can be related to paleosurfaces. Recent studies on the Quaternary deposits in the L’Aquila Basin allowed the identification of the Valle Daria abandonment surface, which marks an important phase of base-level fall of the drainage system that occurred during the early Pleistocene (Gelasian). Although morphostratigraphic analysis well describes the evolution of these two basins during the Quaternary, the knowledge related to the higher paleosurfaces and their meaning in the landscape evolution is still poorly constrained. In this study, we applied advanced morphometric and morphostructural analysis to the Aterno and Tirino basins, with a focus on the identification of the main paleosurfaces, their dating, and reconstructions of the baselevel-fall variations of the drainage system through time. We used a 10-m resolution DEM to map the position and elevation ranges of the flat surfaces, extract the drainage system, and identify knickpoints and low-gradient levels. We then combined the morphometric results with the morphostratigraphy and tectonics of the area to define the paleosurfaces, correlate the levels, and assign them ages. We identified 4 main levels of paleosurfaces, the lowermost (P3 and P4) respectively related to Valle Daria (early Pleistocene, top Gelasian) and the top of Fosso Genzano Synthem (middle Pleistocene), the higher ones (P1 and P2) that have been related to the thrust-top basins of Monte Coppe (latest Messinian) and Rigopiano (late Zanclean). We finally applied linear inversion of the Aterno and Tirino drainage systems to infer the evolution of base-level and find a possible correlation with central Apennine uplift phases. Our results show three main events in the drainage baselevel-fall rate. The first two events occurred at ca. 3 Ma and 2 Ma, in accordance with the uplift and abandonment of P2 and P3, and the middle to late Pleistocene peak in base-level fall that could be related to changes in the Sulmona Basin and Pescara River systems.

Paleosurface mapping and Quaternary uplift evolution of the Aterno and Tirino Basins

Orogenic plateaus represent the most spectacular consequence of continental collisions in orogenic belts. The mechanisms related to the growth of an orogenic plateau are still debated and can be the result of multiple tectonic phases and changes in collisional dynamics between the involved plates. In the last decades, the study of landscapes and landforms experienced a significative growth providing new advanced numerical models to relate surface deformation, topographic evolution and plate dynamics. In the Mediterranean area, the Central Anatolian Plateau represents a good example of how different mantle and crustal processes can be involved in building a plateau. The study of the topographic features alongside the plateau margins, such as drainage systems and marine terraces, revealed significantly different uplift histories and mechanisms characterizing the northern and the southern margins. While the northern margin of the plateau experienced vertical uplift from 11Ma ca to the present that can be associated with the transpression along the Northern Anatolian Fault, the southern margin records a fast uplift phase during Pleistocene, causing 1500 km of vertical uplift in about 600.000 years, which has been related to the break-off of the subducting African plate. In our work, we present a summary of how the numerical modeling of the evolution of drainage systems and marine terraces provided significant insights on the uplift history and the topographic evolution of the Central Anatolian Plateau margins, and how these results are linked to the geodynamical processes involving the Anatolian plate boundaries.

Landscape evolution and plate boundary processes: the study case of the Central Anatolian Plateau margins

**Session Chairs: **Giovanni Barreca (University of Catania), David Iacopini (University of Naples - Federico II), Stefano Zanchetta (University of Milano - Bicocca), Francesca Cifelli (University of Roma - Roma Tre)

S1. Tectonics and sedimentation I

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The National Institute of Oceanography and Experimental Geophysics - OGS and the Department of Mathematics and Geosciences of the University of Trieste are proud to host the 90th Congress of the Italian Geological Society in Trieste on 14-16 September 2021.  The Congress will be held entirely online.

With the motto "Geology Without Borders" this event aims to promote Earth Sciences as a scientific discipline projected into the future, beyond geographical, political and disciplinary boundaries, to better understand the interior of Planet Earth and the structure of the subsurface, defend society from dangerous geological events, better understand climatic variability, plan the use of geo-resources in an ethical way and respecting the environment.


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Earth Sciences should be understood not only as necessary for a better understanding of the interior of the planet Earth, but also as a defense of society from dangerous geological events, for the understanding of climatic variations, for the planning and use of georesources in a ethical and respecting and protecting the environment.

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Simone Racano

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Paleosurface mapping and Quaternary uplift evolution of the Aterno and Tirino Basins

Landscape evolution and plate boundary processes: the study case of the Central Anatolian Plateau margins

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