The terraced surfaces off the northern Cilento region: geomorphological evidences of Late Quaternary sea level fluctuations based on high resolution seismic profiling (Abstract/Poster in atti di convegno)

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  • The terraced surfaces off the northern Cilento region: geomorphological evidences of Late Quaternary sea level fluctuations based on high resolution seismic profiling (Abstract/Poster in atti di convegno) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Alternative label
  • Gemma Aiello; Ennio Marsella; Nicola Pelosi (2009)
    The terraced surfaces off the northern Cilento region: geomorphological evidences of Late Quaternary sea level fluctuations based on high resolution seismic profiling
    in Geoitalia 2009, Rimini
    (literal)
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  • Gemma Aiello; Ennio Marsella; Nicola Pelosi (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni
  • Abstract e Poster a Convegno Nazionale (literal)
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  • The processing and the interpretation of a densely spaced grid of high resolution seismic reflection profiles recorded on the Campania continental shelf between the Solofrone river mouth and the town of Agnone (northern Cilento region) have allowed to carry out a study focused on the recognition of terraced surfaces and their relationships to the Late Quaternary sea level fluctuations. The geological interpretation of the seismic sections has been carried out using the criteria of seismic stratigraphy, allowing for the distinction of the main seismo-stratigraphic units, which characterize the architecture of the continental shelf. Seismic interpretation allowed to discriminate the morpho-structural highs of the acoustic basement, related to the Flysch del Cilento Auct., widely cropping out nearshore from the depocentral areas, characterized by the accumulation of marine sediments. The outcrops of the acoustic basement, abundant at water depths ranging between - 10 m and - 50 m are often involved by terraced surfaces having low gradients. The terraced surfaces are particularly abundant in correspondence to the Punta Licosa structural high. The correlation with Side Scan Sonar sonograms has evidenced the occurrence of Posidonia oceanica and Cymodocea nodosa grasses, covering the outcrops of the acoustic basement at the sea bottom. (literal)
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  • Abstract (literal)
  • ISI Web of Science (WOS) (literal)
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  • CNR-IAMC Sede di Napoli (literal)
Titolo
  • The terraced surfaces off the northern Cilento region: geomorphological evidences of Late Quaternary sea level fluctuations based on high resolution seismic profiling (literal)
Abstract
  • The processing and the interpretation of a densely-spaced grid of high resolution seismic reflection profiles recorded on the Campania continental shelf between the Solofrone river mouth and the town of Agnone (northern Cilento region) have allowed to carry out a study focused on the recognition of the terraced surfaces and their relationships to the Late Quaternary sea level fluctuations. The geological interpretation of the seismic sections has been carried out using the criteria of seismic stratigraphy, allowing for the distinction of the main seismo-stratigraphic units, which characterize the architecture of the inner continental shelf. Seismic interpretation allowed to discriminate the morpho-structural highs of the acoustic basement, related to the Flysch del Cilento Auct.,widely cropping out nearshore from the depocentral areas, characterized by the accumulation of marine sediments. The outcrops of the acoustic basement, abundant at water depths ranging between - 10 m and - 50 m are often involved by terraced surfaces having low gradients. The terraced surfaces are particularly abundant in correspondence to the Punta Licosa structural high. The correlation with Side Scan Sonar sonograms has evidenced the occurrence of Posidonia oceanica and Cymodocea nodosa grasses, covering the outcrops of the acoustic basement at the sea bottom. The acoustic basement is downthrown by normal faults under the Quaternary sedimentary cover, which is organised in three main seismo-stratigraphic units, separated by regional unconformities. The lowest unit (unit 1) is characterized by parallel seismic reflectors and shows an average thickness ranging between 40 and 50 m; it is composed by marine sediments and bounded at the top by a main seismic reflector, which seems in stratigraphic continuity (A reflector). The intermediate unit (unit 2), having an average thickness between 7 and 10 m is characterized by an acoustically transparent seismic facies and probably composed by sands. The highest unit (unit 3), having a thickness of about 10 m, is probably composed of alternating sands and shales. Seismic interpretation allowed for the identification of four main orders of terraced surfaces on the acoustic basement. The oldest ones occur mainly in the central sector of the Punta Licosa morpho-structural high at water depths ranging between - 40 m and - 53 m and probably represent a short sea level stillstand occurring during the Flandrian transgression. This interpretation is supported by the coastal geomorphology evidences off Capo Palinuro (Punta Iacco) on the basis of the studies of Antonioli et al. (1997). The second order of surfaces, uncertain in its correlation to the curves of the isotopic stratigraphy, occur at water depths between - 27 m and - 17 m. The third order of terraced surfaces occur at water depths ranging between - 10 m and - 14 m and is probably related to the uppermost part of the isotopic stage 3. This interpretation is suggested by the correlation with the water depths reported by Alessio et al. (1992) in their curves and by similar surfaces occurring in rocky lithologies off the Capo Palinuro area. A fourth order of terraced surfaces has been recognised at water depths of - 8 m. They are probably related to the abrasion notches recognised at about - 7 m along the sea cliff of Capo Palinuro and tentatively assigned to the isotopic substage 5.1 (Antonioli et al., 1997). Basic references Alessio M., Allegri F., Antonioli F., Belluomini G., Ferranti L., Improta S., Manfra L., Proposito A. (1992) - Risultati preliminari relativi alla datazione di speleotemi sommersi nelle fasce costiere del Tirreno centrale. Giornale di Geologia, 54 (2), 165-193. Antonioli F., Cinque A., Ferranti L., Romano P. (1997) - Emerged and submerged Quaternary marine terraces of Palinuro Cape (Southern Italy). Memorie Descrittive della Carta Geologica d'Italia, 52, 237-260. (literal)
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