GNGTS 2013 - Atti del 32° Convegno Nazionale

A new detailed seismic stratigraphy of the Gulf of Pozzuoli (Naples Bay, southern Tyrrhenian sea) based on high resolution seismic reflection profiles: insights into the offshore volcanology of the Phlegrean Field volcanic complex G. Aiello, E. Marsella Istituto per l’Ambiente Marino Costiero (IAMC), Consiglio Nazionale delle Ricerche (CNR), Napoli, Italy Introduction. A new detailed seismic stratigraphy of the Gulf of Pozzuoli (Naples Bay, southern Tyrrhenian sea, Italy) is here purposed and discussed based on the geological interpretation of high resolution seismic reflection profiles, recently collected in the frame of research programmes of marine geological mapping. This offshore stratigraphy is utilized to put some new insights on the marine volcanology of the Phlegrean Fields volcanic complex, deeply studied onshore through field volcanological data. The new stratigraphic setting here purposed will improve the geological and geophysical knowledge on the active volcanic area of the Phlegrean Fields and the adjacent offshore sectors. The tectonic framework of the area will also be discussed based on seismic interpretation and identification of main fault systems and their relationships to the main regional unconformities in the Pozzuoli basin filling. The stratigraphy and geology of volcanic areas, such as the Gulf of Pozzuoli, has been recently studied in detail (Groppelli and Goette, 2010), focussing on several aspects. Some results mainly deal with the types of mappable stratigraphic units and unconformity bounded units (Lucchi et al. , 2010; Tibaldi, 2010; Bonomo and Ricci, 2010; Palladino et al. , 2010), centering on Italian volcanoes and showing the use of different applications in the concept of mapping on the base of stratigraphic units, with the aim to define the evolution of a volcanic area. These studies have applied in the field survey the lithosomatic and synthemic units (or Fig. 1 – Shaded relief map of the Multibeam bathymetry (ELAC, Bottomchart MK2) recorded in the Bay of Naples by the CNR-IAMC Institute (reported from Aiello et al., 2001 and D’Argenio et al., 2004). 5 GNGTS 2013 S essione 3.1