Stratigraphic and structural styles of half-graben offshore basins in Southern Italy: multichannel seismic and Multibeam morpho-bathymetric evidences on the Salerno Valley (Southern Campania continental margin, Italy)

Aiello, Gemma and Marsella , Ennio and Di Fiore, Vincenzo and D'Isanto , Claudio (2009) Stratigraphic and structural styles of half-graben offshore basins in Southern Italy: multichannel seismic and Multibeam morpho-bathymetric evidences on the Salerno Valley (Southern Campania continental margin, Italy). Quaderni di geofisica, 77. pp. 1-33. ISSN 1590-2595

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Abstract

New results on the seismic stratigraphy and morpho-bathymetry of the Pleistocene sedimentary basin of the Salerno Valley focused on the regional seismic stratigraphy of the Southern Campania passive continental margin (Southern Tyrrhenian sea, Italy) are presented here.Original data include Multibeam bathymetry as well as multichannel and single-channel seismic profiles, recently collected onboard the R/V Urania of the National Research Council of Italy (oceanographic cruise SISTERII). The Salerno Valley represents a half-graben sedimentary basin, whose identification has been controlled, during the Early Pleistocene, by the master fault Capri-Sorrento Peninsula, showing vertical throws of 1500 metres, which downthrows theMeso-Cenozoic carbonatic acoustic basement under the sedimentary basin.The geologic interpretation of multichannel seismic profiles has enabled the identification of amain unconformity, located at depths ranging from 3000 to 3500 metres under the sea bottom and correlated to the top of the Meso-Cenozoic carbonatic sequence,extensively cropping out onshore in the Sorrento Peninsula structural high. This unconformity bounds upwards the carbonatic acoustic basement, strongly deformed by normal faulting, and represents the base of the Pleistocene basin filling, the Salerno Valley. The basin filling, with an overall thickness exceeding 1000metres, is characterised by parallel and continuous seismic reflectors alternating with chaotic intervals, having acoustically-transparent seismic facies. The strong synsedimentary tectonics lasting up to Late Pleistocene times in correspondence to NNW-SSE trending listric normal faults triggered gravity mass instability processes, evident as chaotic acoustic intervals intercalated at various stratigraphic levels in the stratigraphic record shown by the multichannel seismic profiles.

Item Type: Article
Subjects: 500 Scienze naturali e Matematica > 550 Scienze della Terra > 551 Geologia, Idrologia, Meteorologia > 551.4 Geomorfologia e idrosfera > 551.46 Idrosfera, Geologia sottomarina e Oceanografia (Classificare qui le acque marine, l'Idrografia, l'Oceanografia fisica; le opere interdisciplinari sulla Scienza del mare, sugli oceani e i mari) > 551.468 Geologia sottomarina (Classificare qui il fondo oceanico) > 551.4686 Sedimenti
Depositing User: Dr Gemma Aiello
Date Deposited: 10 Jun 2011 09:48
Last Modified: 10 Jun 2011 09:48
URI: http://eprints.bice.rm.cnr.it/id/eprint/3349

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