ASSETTO MORFOTETTONICO E MORFOSTRATIGRAFICO DI ALCUNI DEPOSITI CONTINENTALI PLEISTOCENICI DEL BACINO DEL PERGOLA-MELANDRO (APPENNINO LUCANO)

Abstract

The relationships between some morphostructural and stratigraphic features outcropping in the Pergola-Melandro intermontane basin have been investigated. Tectonic events have conditioned the geomorphological evolution of the basin during Pleistocene times. A morphological ridge, constituted by pre-Quaternary bedrock, separates the basin in two small sub-basins. The first (S. Angelo subbasin) is characterized by alluvial deposits with coarse-grained and pelite facies. In the second one (Brienza sub-basin) the alluvial
system proximal facies crop out. Stratigraphic and structural analyses have been carried out in the upper portion of these continental
clastic succession.
Three sedimentary episodes separated by erosional surfaces and/or palaeosoils are recognised. They reflect different morphoclimatic
regimes which occurred in early Pleistocene. Both NE-SW and NW-SE trending fault systems deformed the clastic succession. One
can observe that a conglomerate horizon seal a NE-SW sinsedimentary fault, whereas the NW-SE-trending faults dissect the entire clastic succession and the erosional terraces, middle Pleistocene in age.
Talus cones constituted by breccia deposits outcropping in the Santa Domenica area show only two depositional episodes separated
by red palaeosoils and erosional surfaces. Deposits and palaeosoils have been dissected by NW-SE-trending faults. Furthermore, the
breccias have been tilted counterslope by these faults. Stratigraphic and morphotectonic relationships suggest a recent tectonic and
seismogenetic activity of this fault systems in the axial zone of the southern Apennines.