The Subsurface Geology and Landscape Evolution of the Volturno Coastal Plain, Italy: Interplay between Tectonics and Sea-Level Changes during the Quaternary

Abstract

The Volturno alluvial-coastal plain is a relevant feature of the Tyrrhenian side of southern Italy. Its plan-view squared shape is due to Pliocene-Quaternary block-faulting of the western flank of the south-Apennines chain. On the basis of the stratigraphic analysis of almost 700 borehole logs and new geomorphological survey, an accurate paleoenvironmental reconstruction before and after the Campania Ignimbrite (CI; about 40 ky B.P.) eruption is here presented. Tectonics and eustatic forcing have been both taken into account to completely picture the evolution of the coastal plain during Late Quaternary times. The upper Pleistocene-Holocene infill of the Volturno plain has been here re-organized in a new stratigraphic framework, which includes seven depositional units. Structural analysis showed that two sets of faults displaced the CI, so accounting for recent tectonic activity. Yet Late Quaternary tectonics is rather mild, as evidenced by the decametric vertical separations operated by those faults. The average slip rate, which would represent the tectonic subsidence rate of the plain, is about 0.5 mm/yr. A grid of cross sections shows the stratigraphic architecture which resulted from interactions among eustatic changes, tectonics and sedimentary input variations. On the basis of boreholes analysis, the trend of the CI roof was reconstructed. An asymmetrical shape of its ancient morphology—with a steeper slope toward the north-west border—and the lack of coincidence between the present course of the Volturno River and the main buried bedrock incision, are significant achievements of this study. Finally, the morpho-evolutionary path of the Volturno plain has been discussed.

Quaternary Evolution of the Lower Calore and Middle Volturno Valleys (Southern Italy)

“…Here, a deep (up 30 m) incised paleovalley of the Volturno River, following the modern river axis, is cut in CI deposits, and sealed by a first generation of alluvial deposits dated to 37 ka [74]. However, in our hypothesis most of the valley incision occurred only later, during the LGM (~21 ka [75]), as also recorded in the lower Volturno Plain [74,[76][77][78][79]. We relate this incision to the upstream propagation of regressive erosion waves from the Tyrrhenian coast, triggered by the base level fall during the LGM low sea level stand.…”

“…We relate this incision to the upstream propagation of regressive erosion waves from the Tyrrhenian coast, triggered by the base level fall during the LGM low sea level stand. Tectonic subsidence affecting the Campania plain [76,77,79,80] must have further favored the development of retrogressive erosion waves as highlighted by some knickpoints along the longitudinal profile of the Volturno River. Inside the main valleys, instead, the role of intra-chain tectonics is completely marginal and negligible.…”

3D geological model to assess the fate of contaminant transport in groundwater: the case study of Maruzzella Landfill (Caserta, Italy)

“…During the Pleistocene-Early Holocene (ca. 15 ka-6 ka) the post-glacial rising of sea level caused a rapid flooding of the Volturno River plain (Corrado et al, 2020;Ruberti et al, 2022). Since 6.5 ka BP a coastal progradational phase established, allowing the formation of the present-day alluvial plain and the wave-dominated delta system.…”

From Siliciclastic to Bioclastic Deposits in the Gulf of Naples: New Highlights from Offshore Ischia and Procida–Pozzuoli Based on Sedimentological and Seismo-Stratigraphic Data

“…On the Campania-Latium continental margin, sedimentary basins perpendicular to the chain occur in correspondence with NE-SW trending normal faults [43][44][45][46][47][48][49]. Their tectonostratigraphic setting has been investigated based on both field geological survey [48][49][50] and onshore and offshore seismic data [43,47,[51][52][53][54].…”