GNGTS 2016 - Atti del 35° Convegno Nazionale

GNGTS 2016 S essione 3.2 535 been successfully applied in seismo-stratigraphic interpretation of high resolution seismic data (Fig. 1) to produce reliable geoseismic sections showing the stratigraphic relationships among volcanic bodies and interstratified marine deposits, mostly pertaining to the Late Quaternary depositional sequence (De Lange et al. , 1989; Amorosi et al. , 2008; Riboulot et al. , 2012; Oyedele and Duprè, 2014; Aiello and Marsella, 2015). Tab. 1 – Table of the seismic units in the Gulf of Pozzuoli (high resolution seismic stratigraphy). Seismic unit HST TST Lsl LST G1 Lsl2 NYT/PC G2 Lsl1 Pyr2 dK Pyr1 G3 V3 Seismic facies Progradational to parallel seismic reflectors Retrogradational seismic reflectors Wedge-shaped chaotic and discontinuous seismic unit. Progradational seismic reflectors, erosionally truncated at their top. Parallel and continuous seismic reflectors. Wedge-shaped chaotic and discontinuous seismic unit NYT: wedge-shaped acoustically transparent volcanic seismic unit. PC: mound-shaped acoustically- transparent volcanic bodies interstratified with parallel reflectors. Parallel and continuous seismic reflectors. Wedge-shaped, chaotic to discontinuous seismic unit. Continuous progradational to parallel seismic reflectors Sub-vertical volcanic bodies, acoustically-transparent and locally bounded by normal faults. Discontinuous to parallel seismic reflectors. Discontinuous to parallel seismic reflectors. Discontinuous and acoustically- transparent seismic unit, strongly eroded at its top. Geologic interpretation Highstand System Tract (HST) Transgressive System Tract (TST) Landslide deposits interstratified in the upper part of LST; occurrence of palaeochannels. Lowstand System Tract (LST) Upper unit of the Pozzuoli basin fill. Fossil submarine landslide overlying the G2 marine unit and underlying LST deposits. NYT: pyroclastic deposits of the Neapolitan Yellow Tuff (12 ky), deposited in Naples and Pozzuoli offshore. PC: Tuff cones of the Nisida volcanic complex, in facies hetheropy with NYT and interstratified with G3 marine deposits. Intermediate seismic unit of the basin fill; marine clastic deposits involved by strong wedging and growth, showing the activity of synsedimentary tectonics. Wide paleo-landslide overlying the V3 volcaniclastic unit and coeval with the basal part of the G2 marine unit. Pyroclastic unit Volcanic dykes due to magma uprising in correspondence to normal faults. Pyroclastic unit Lower sedimentary unit of the basin fill deformed in anticlines (Punta Pennata anticline, Pozzuoli anticline, Nisida anticline) and corresponding synclines (central syncline of Pozzuoli; Epitaffio syncline). Volcaniclastic unit related to the northern margin of the Pentapalummo bank, deformed by aforementioned compressional structures. Location Eastern sector of the Gulf of Pozzuoli Eastern sector of the Gulf of Pozzuoli Gulf of Pozzuoli, south of Miseno Cape. Inner continental shelf of the Gulf of Pozzuoli Gulf of Pozzuoli Eastern sector of the Gulf of Pozzuoli Naples and Pozzuoli offshore. Gulf of Pozzuoli. Eastern sector of the Gulf of Pozzuoli Offshore from Capo Miseno to Miseno Bank Eastern and central Gulf of Pozzuoli. Structural depression under the volcanic edifice of Capo Miseno Naples and Pozzuoli Gulfs. Gulf of Pozzuoli.