The recent evolution of the south-eastern Alpine chain inferred from river supplies

Category Sedimentology
Group GSI.IR
Location International Geological Congress,oslo 2008
Author Stefani, Cristina۱; Monegato, Giovanni۱; Zattin, Massimiliano۲
Holding Date 11 October 2008

The italian Southern Alps, as other chains surrounding the Mediterranean realm, were deeply eroded during the Messinian salinity crisis, as a consequence of the rapid drop in sea level. The successive Pliocene marine transgression reached the present southernmost margin of the Venetian and western Friulian plain, where the Messinian paleovalleys were infilled with progressively more proximal deposits. Our investigations have been focused on petrographic signature of ancient (Upper Messinian) fluvial deposits compared with the modern river sands in order to evaluate the changes of supplies along some important directories. These data have been integrated by detrital apatite fission-track analysis, which uses the fission-track age of single grains to identify their source region. On the basis of this approach, we present a schematic temporal and paleogeographic evolution of the Venetian–Friulian plain during the last 5 m.y.