Migrazioni e fuoriuscite di fluidi lungo la piattaforma campana settentrionale: osservazioni su profili Chirp e Sparker

A set of high resolution Subbottom Chirp, Sparker profiles and swath bathymetric data have been acquired in the frame of PONa3_00363 I AMICA project immediately offshore the Volturno river mouth (Southern Tyrrhenian Sea). The palaeo-topography of the Last Glacial Maximum (LGM) erosional surface was mapped by the interpolation of seismically-detected horizons, allowing a false-3D reconstruction. The morphology of the LGM revealed the presence of soft and distributed fault linkages, defined by a small-scaled accommodation zone with an interbasinal relative high, revealing an E-W trending direction. The observed set of oppositely dipping faults, NNW and an ENE directed, locally controlled the deposition of paralic transgressive bodies, as testified by their wedging external geometry, with a deformation presumably linked to the Phlegrean Field caldera collapse, following Neapolitan Yellow Tuff (NYT) eruption and aged 15 ka. The relevant thickness of the Transgressive Sistem Tract (TST) itself, if compared to adjacent shelf areas, testifies an increased sediment yield and intense reworking in coastal areas, probably driven by high volcanoclastic supply during volcanic paroxysm, almost coeval to the post-glacial sea-level transgression. Fluid escape features, interpreted as intrusion related structures, suggested the occurrence of an E-W striking fluid front located at the shelf edge and the presence of an hydrothermal vent.