Control exerted by collisional tectonics on basin topography and depositional styles: The Tertiary Piedmont Basin in the Alps-Apennines Junction (NW Italy).

The field trip focuses on the deep-water clastic fill of a small sub-basin part of the eastern Tertiary Piedmont Basin (TPB, NW Italy). The trip is aimed at evaluating the control of a changing basin topography due to syn-depositional transpressive tectonics upon the development of facies and architectures of turbidite clastic systems. The field trip illustrates some basic geometries and facies associations of the Oligo – Miocene turbidite systems which form part of the basin fill, aiming to discuss the relations between the degree of basin confinement and the types of facies and bed geometries developed with special emphasis on hybrid bed events. As an additional topic, thanks to the detailed petrographic-mineralogic study of both the sandy and muddy fraction of beds forming a system unusually made by turbidites fed by two different sources, the origin and amount of en-route incorporation of mud during turbidite flows is quantitatively discussed.