GNGTS 2022 - Atti del 40° Convegno Nazionale

GNGTS 2022 Sessione 1.1 53 We analyse three sediment cores that were collected in confined depressions offshore Calabria at water depths ranging from 2050 to 2945 m (Fig.1). Their depositional sites lay in tectonically controlled basins in the inner accretionary wedge. The stratigraphic reconstruction is based on the identification of peculiar marker beds through the analyses of radiometric ages, XRF data, grain size and foraminifera associations. The sediment core shows a succession of turbidite beds, hemipelagic intervals and a tephra layer. The total thickness of pelagic layers implies that resedimentation processes represent 88% of total sedimentation. Fig. 1 - Geodynamic setting of the study area and structural map of the Calabrian Arc subduction system in the Ionian Sea as derived from the interpretation of available seismic data (Polonia et al. , 2011) integrated with multibeam bathymetry data. Yellow arrow indicates Europe (Eu) and Africa (Afr) slip vector in the Africa reference frame. Note the presence of seismogenic faults segmenting the margin both across and along strike (red lines). Green circles indicate sediment cores analyzed in this study while the white star represents core CALA 21 described in Polonia et al. 2015. Epicenters of historical earthquakes (Rovida et al. , 2022) are indicated by red circles.