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SES-01 General contributions to sedimentology
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Insights into flood-dominated, mixed siliciclastic-volcaniclastic fan deltas: Very high-resolution seismic examples off the Amalfi cliffed coasts, eastern Tyrrhenian sea
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Flavia Molisso, Consiglio Nazionale delle Ricerche (CNR) (Italy)
Crescenzo Violante, Consiglio Nazionale delle Ricerche (CNR) (Italy)
Eliana Esposito, Consiglio Nazionale delle Ricerche (CNR) (Italy)
Donatella Insinga, Consiglio Nazionale delle Ricerche (CNR) (Italy)
Carmine Lubritto, Seconda Università di Napoli (Italy)
Sabina Porfidio, Consiglio Nazionale delle Ricerche (CNR) (Italy)
Tamas Toth, Geomega Ltd. (Hungary)
Marco Sacchi, Consiglio Nazionale delle Ricerche (CNR) (Italy)
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A high resolution (IKB-Seistec) seismic survey calibrated with gravity core data, offshore the Amalfi coast, a rocky coastal area on the southern side of the Sorrento peninsula (Italy), documents the internal stratigraphic architecture of a series of small fan deltas that develop at the mouth of major bedrock streams. The fan delta system mostly postdates the plinian eruption of the Vesuvius of AD 79 and displays various phases of development that were ostensibly associated with periods of high sediment supply from the adjacent river basins.
During these periods landscape-mantling loose pyroclastic deposits (mostly airfall tephra erupted by the Vesuvius) were quickly eroded and delivered to the continental shelf by sheet wash and flash floods events. Depositional processes on the foresets were dominated by sediment gravity flows originating from hyperpycnal river flow and gravity induced slumps. This in turn created favorable conditions for seafloor instability, soft sediment failure, slumping and sliding that characterize the deltaic stratigraphic architecture. The intermittently increased sediment yields during the various phases of the evolution of the fan delta system, was likely influenced also by the morphoclimatic regime and resulted into varying rates in the prograding of the delta foresets that is tentatively correlated with the main climatic oscillations of the last 2 kyrs. The Amalfi fan delta system represents an interesting small-scale analogue for larger flood-dominated fan deltas of the world and may be regarded an example useful for a better understanding of inner shelf, mixes siliciclastic-volcaniclastic fan delta systems in the stratigraphic record.
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