L’evoluzione paleoambientale tardo-Quaternaria del litorale veneziano nelle attuali conoscenze

Abstract

The evolution of the Venetian littoral in the last 30,000 years has been inferred on the basis of paleontological, sedimentological, geotechnical and radiocarbon dating analyses performed on hundreds of sediment samples from 18 cores obtained with boreholes up to the depth of 25 m, and of related literature. Late-Pleistocene sediments are made up of continental fluvial, lacustrine and marshy deposits, while Holocene soils belong to a marine-lagoon environment with local evidence of a continental sedimentation. Different depositional environments are identified in the southern portion and northern portions of the Venetian littoral for both Pleistocene and Holocene times. In particular, the Holocene includes two marine transgressions recognizable on a regional scale as due to a sea level rising, and on a local scale as due to fluvial dynamics. Some minor discontinuous regression-transgression cycles are also identified.