New seismo-stratigraphic data on buried volcanic structures in the south-eastern offshore of the Ischia island (Naples Bay, Southern Tyrrhenian sea): implications for the Campania volcanism (Abstract/Poster in atti di convegno)

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  • New seismo-stratigraphic data on buried volcanic structures in the south-eastern offshore of the Ischia island (Naples Bay, Southern Tyrrhenian sea): implications for the Campania volcanism (Abstract/Poster in atti di convegno) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1474/Epitome.04.1224.Geoitalia2011 (literal)
Alternative label
  • Gemma Aiello; Ennio Marsella (2011)
    New seismo-stratigraphic data on buried volcanic structures in the south-eastern offshore of the Ischia island (Naples Bay, Southern Tyrrhenian sea): implications for the Campania volcanism
    in Geoitalia2011, Torino
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Gemma Aiello; Ennio Marsella (literal)
Pagina inizio
  • 328 (literal)
Pagina fine
  • 329 (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#titoloVolume
  • Epitome 2011 - Geoitalia 2011 (literal)
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  • Abstract e poster in Convegno Internazionale (literal)
Note
  • Abstract (literal)
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR-IAMC Sede di Napoli (literal)
Titolo
  • New seismo-stratigraphic data on buried volcanic structures in the south-eastern offshore of the Ischia island (Naples Bay, Southern Tyrrhenian sea): implications for the Campania volcanism (literal)
Abstract
  • Some new seismo-stratigraphic data on buried volcanic structures and Quaternary deposits in the south-eastern offshore of Ischia island (Naples Bay) are here presented. In particular, we focus our presentation on southern continental slope of Ischia island and eastern Ischia offshore, surveyed during the realization of geological maps at the scales 1:25.000 and 1:10.000 (Geological Map n. 464 \"Ischia\"; Aiello et al., 2009, Explanatory Notes to the Geological Map; Marine Geology, in press). The geological bodies recognized through seismic interpretation are the volcanic seismic units, acoustically transparent, representing the rocky acoustic basement and the systems tracts of the Late Quaternary depositional sequence. The prevailing volcanic activity, which controlled the stratigraphic setting of the Naples Bay, has prevented the application of a classical stratigraphic approach, taking into account the associations of depositional systems and the interstratified volcanic bodies (volcanites and volcanoclastites). The sequence stratigraphic approach permits recognition and mapping of depositional bodies defined as three-dimensional objects, consequently to their relative stratigraphic position. Complementary stratigraphic information about the nature of the individuated depositional bodies and the geological processes controlling their deposition and preservation is furnished. Volcanic deposits resulting from effusive and explosive eruptions extensively crop out in the Ischia island, constructing volcanic edifices; some of them are still well preserved, other ones are completely dismantled or buried. The main geo-volcanologic event is represented by the eruption of the Green Tuff of the Epomeo Mt, conditioning a complex calderic resurgence. It allowed for gradual uplift and emersion of the calderic rocks with a rate of about 800-1100 m. Corresponding volcanic products crop out along the southern coasts of the island of Mt Vico, S. Angelo and Scarrupata di Barano. In the Ischia island the occurrence of intrusions, volcanic domes and necks and tabular seismic units makes more complex the sequence stratigraphic approach in the geological interpretation of seismic profiles. The marine sedimentation includes both the contribution of siliciclastic sediments, alluvial or marine in origin and that one of volcanites and volcanoclastites erupted by Ischia and Procida volcanic complexes. While the volcanic bodies are deaf to the acoustic energy, the pyroclastic edifices and/or deposits may be acoustically observed. As a consequence, the seismic stratigraphy offshore the Phlegrean Fields is more complex and difficult to interpret with respect of that one of the eastern sector of the Naples Bay, where sedimentary seismic units prevail, apart from the Dohrn canyon morpho-structural lineament. The sub-actual terrace of the Maronti offshore, coincident with a progradational wedge deposited during the last 5-6 ky should coincide, in terms of geological times, with the Holocene highstand wedge. This is not confirmed neither by the thickness of the Holocene sequence, anomalously high, due to high sedimentary rates coming from the Serrara-Fontana basin neither by its internal geometries. A geologic section has been constructed along the south-eastern Ischia offshore. It documents the stratigraphic relationships between the volcanic units of the acoustic basement and the Quaternary deposits. The section is located along the volcanic structure of the Ischia Bank through the Ischia Channel. Here it crosses the relic volcanic edifice \"Il Pertuso\" and arrives up to the continental shelf of Procida island (Punta Solchiaro). (literal)
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