Stratigraphic and structural styles of half-graben offshore basins in Southern Italy: seismic stratigraphy and morpho-bathymetry of the Salerno Valley (Southern Campania continental margin, Italy) (Abstract/Poster in atti di convegno)

Type
Label
  • Stratigraphic and structural styles of half-graben offshore basins in Southern Italy: seismic stratigraphy and morpho-bathymetry of the Salerno Valley (Southern Campania continental margin, Italy) (Abstract/Poster in atti di convegno) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Alternative label
  • Gemma Aiello (1); Ennio Marsella (1); Vincenzo Di Fiore (1); Claudio D'Isanto (2) (2009)
    Stratigraphic and structural styles of half-graben offshore basins in Southern Italy: seismic stratigraphy and morpho-bathymetry of the Salerno Valley (Southern Campania continental margin, Italy)
    in Geoitalia 2009, Rimini
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Gemma Aiello (1); Ennio Marsella (1); Vincenzo Di Fiore (1); Claudio D'Isanto (2) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni
  • Abstract e Poster in Atti di Convegno Nazionale (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • New multichannel and single-channel seismic profiles and morpho-bathymetric data consisting of high resolution Multibeam bathymetry of the Pleistocene sedimentary basin of the Salerno Valley, located on the Southern Campania passive continental margin (Tyrrhenian sea, Italy) have been analysed to investigate the tectono-sedimentary evolution of this part of the Southern Tyrrhenian margin during the Pleistocene. Regional seismic lines have been acquired parallel to and across the continental margin off Campania. Multichannel seismic profiles clearly document the geometries of normal faults running parallel to the margin. The geological interpretation of multichannel seismic profiles has enabled the identification of a main unconformity, located at depths ranging from 3000 to 3500 meters 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 of the Salerno Valley. (literal)
Note
  • ISI Web of Science (WOS) (literal)
  • Abstract (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • (1) CNR-IAMC Sede di Napoli (2) Collaboratore esterno, Dottore di ricerca (literal)
Titolo
  • Stratigraphic and structural styles of half-graben offshore basins in Southern Italy: seismic stratigraphy and morpho-bathymetry of the Salerno Valley (Southern Campania continental margin, Italy) (literal)
Abstract
  • New multichannel and single-channel seismic profiles and morpho-bathymetric data consisting of high-resolution Multibeam bathymetry of the Pleistocene sedimentary basin of the Salerno Valley, located on the Southern Campania passive continental margin (Tyrrhenian sea, Italy) have been analysed to investigate the tectono-sedimentary evolution of this part of the Southern Tyrrhenian margin during the Pleistocene. The area provides a good example for a better understanding of the evolution of extensional (half-graben) sedimentary basins offshore Southern Italy. The Southern Tyrrhenian continental margin off Campania owes its complex stratigraphic architecture to the interaction between volcanic and sedimentary processes during the Late Quaternary.In this paper, several seismic reflection datasets are presented and interpreted with the aim of contributing to the knowledge of the geological setting of half-graben offshore basins in Southern Italy. Regional seismic lines have been acquired parallel to and across the continental margin off Campania. Multichannel seismic profiles clearly document the geometries of normal faults running parallel to the margin. The profiles parallel to the margin clearly depict the main extensional regions, such as the Bay of Naples, the Salerno Valley and the Sapri Basin. Shortening-related tectonic features also appear, testifying inversion processes at a basin scale. The latter features seem also to indicate a south-westward direction of transport, comparable to that observed in the Cilento region. The Naples Bay represents a half-graben basin controlled by two main normal faults, NE-SW trending, the Phlegrean Fields-Ischia fault and the Capri-Sorrento Peninsula normal fault. Strong downthrows of Meso-Cenozoic sedimentary sequences, representing the acoustic basement, are observed in correspondence of both faults. The Salerno Valley is a Pleistocene half-graben basin originated by the master fault Capri-Sorrento Peninsula, showing vertical throws up to 1500 m and is filled by marine clastic and epicontinental sediments. Strong seismic reflectors inclined towards SSE with apparent angles of 10°-15° appear on seismic profiles, indicating the occurrence of detachment levels in the carbonate multilayer. The extension in the Salerno basin is due to groups of listric normal faults converging on low-angle detachment levels. Another preferential detachment level is located on top of the Miocene flysch terrains. Bathymetric and high resolution reflection seismic data collected in the Salerno Valley indicate that the depositional processes and overfilling of the basin prevail on the continental shelf to the east, while the western sector of the half-graben is the site of erosional and sedimentary processes still active in a canyon (i.e. the Salerno canyon), with depths ranging from 600 m to 1000 m. The occurrence of wedging geometries in the sedimentary successions, of tectonic unconformities, of hummocky reflectors and seismic facies intercalated at several stratigraphic levels in the basin filling are hints of strong synsedimentary tectonics and a strong uplift of the adjacent onshore areas of the Southern Apennines during the Pleistocene. The geological interpretation of multichannel seismic profiles has enabled the identification of a main unconformity, located at depths ranging from 3000 to 3500 meters 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 of the Salerno Valley. The basin filling, with an overall thickness exceeding 1000 metres, is characterised by parallel and continuous seismic reflectors alternating with chaotic intervals, having acoustically-transparent seismic facies. (literal)
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