Relations between DSGSDs, morphostratigraphy of landslide deposits, tectonic and climatic events in central-eastern Sardinia.

• DOI: 10.5194/egusphere-egu2020-22360
• Publication Date: 2020-03-10T06:51:11Z
• Authors: Valentino Demurtas; Giacono Deiana; Paolo Emanuele Orrù

<p>Some cases of deep-seated gravitational slope deformations (DSGSDs) and paleo-landslides in central-eastern Sardinia are presented. This study focuses on the Quaternary landslide deposits preserved flanks Rio Pardu Ulassai valleys. The area is characterized by a wide<br>plateau with prominent Jurassic limestone scarp overlying Palaeozoic metamorphites. Plio-Pleistocenic uplift, linked to Tirrenian basin opening consequent basalt volcanism, generated high slopes. In middle-lower Pleistocene, deepening valley has been accelerated by<br>river capture processes. litho-structural setting prone development rock falls, toppling deformations. During upper-middle Pleistocene fluvial dynamics were dominated eustatic phases. aim this determine morpho-stratigraphy main characteristics using geomorphic, sedimentological morphotectonic analysis. use resolution UAV (Unmanned aerial vehicle) photogrammetry geological, structural, geomorphological surveys allowed detailed morphometric analysis creation interpretative 3d models. recognize new morphostructural elements compound lateral spreading sackung which involves giant carbonate blocks underlying foliated high-resolution data formulation hypotheses about evolution kinematics DSGSD landslides. results field surveys, actual paleo-landslide show morphostratigraphic framework encompasses three order rockfalls DSGSD. Cemented, quiescent active tentatively attributed Pliocene, Holocene tectonic climatic events, compared traditional stratigraphy eastern Sardinia.</p>