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Communication Dans Un Congrès Année : 2018

Plio-Quaternary mass wasting processes along the Ionian Calabrian margin

Résumé

The Ionian Calabrian margin is a tectonically active area, and is part of the Calabrian Arc, that is the SE tip of the arcuate Appeninc-Maghrebide fold and thrust belt, generated through the Neogene northwest-oriented subduction of the Nubia plate below the Eurasian plate. Based on seabed mapping carried out during the national Project MaGIC (Marine Geohazards Along the Italian Coasts), evidences of mass wasting geomorphic features have been identified along the inner continental slope, i.e. slide scars, canyon headscarps and gravity flow deposits. Two new high-resolution geophysical surveys were recently acquired that extended and improved the existing geophysical dataset: in 2014 the German RV Meteor acquired multibeam bathymetry (50m DTM) and Parasound sub-bottom profiles on a wider area, and in 2015 the Italian RV OGS Explora acquired Chirp sub-bottom profiles and multichannel seismic reflection profiles withih the framework of the RITMARE project. Here we integrate these new data with existing geophysical datasets and published exploration wells to map and characterize submarine slope failures and mass wasting deposits within the Pliocene-Quaternary succession. The results show mass failures are widespread along the steep (higher than 10°) slopes of the Ionian margin south of Calabria, and within small basins in the inner sector of the calabrian accretionary wedge. Seafloor features range from small-scale features (hundreds of meters in extent), that are mainly located on the canyon headwalls and sidewalls, to larger slides (up to 10 km in extent) on open slopes areas. Subsurface profiles across open slopes and in the small basins provide evidence of repeated failures, in particular in the shallower part of the sedimentary sequence (first hundred meters). The stratigraphic distribution of the mass transport deposits along the Ionian Calabrian margin suggests that the vast majority of the mass transport deposits idenfitied, are observed to occur above an unconformity, which has been tentatively dated to the Middle Pleistocene (<1 Ma). This unconformity seems also to represents the lower bound for the onset of canyon formation. We infer that the onset of both mass wasting and canyon formation could be related to the rapid km-scale differential uplift of Calabria over last 1 Ma, which has driven a seaward tilting of the Ionian Calabrian margin thus leading to mass wasting processes and canyon incision.

Dates et versions

hal-02156416 , version 1 (17-06-2019)

Identifiants

Citer

Oliviero Candoni, Silvia Ceramicola, Daniel Praeg, Massimo Zecchin, Giuseppe Brancatelli, et al.. Plio-Quaternary mass wasting processes along the Ionian Calabrian margin. Congresso SGI-SIMP 2018, Società Geologica Italiana, Sep 2018, Catania, Italy. pp.52, ⟨10.3301/ABSGI.2018.02⟩. ⟨hal-02156416⟩
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