GNGTS 2016 - Atti del 35° Convegno Nazionale

182 GNGTS 2016 S essione 1.1 thick passing upwards to fine ashes (60 cm). The maximum diameter of the pumices ranges between 1 and 1.5 cm, testifying to an high intensity of the eruptive event. The chemical analysis shows a fonolitic composition which may be correlated with the most ancient products of the Campania volcanic zone. More in detail the best fitting is with the level Sep5 found inside the S.Marco Evangelista core (Santangelo et al. , 2010) and stratigraphically constrained to the time interval between 105 e 130 ka. Moving westwards along the main fault scarp, in the site P1 (Fig. 3A) as well as in another points along its trace, it was possible to observe that other minor scarps are associated with it. In site P1 one of this secondary scarp clearly cuts the youngest fan generation and shows an height of at least 4 m (Fig. 3B). The deposits of the fan are made up by carbonate conglomerates showing a debris flow facies, interbedded with paleosoils and tephra layers. We sampled the tephra layers P1a, made up by fall pumices 10 cm thick (Fig. 2B). The chemical composition of this sample fits well with that of the Neapolitan Yellow Tuff, aged at 14.9 +/- 0.3 ka (Deino et al ., 2004). The products of this eruption according to Cole e Scarpati (1993) have a dispersion axis towards NE, which is compatible with the location of Paupisi in respect of the source area (Phlaegrean Fileds). Discussion and conclusions. The scarp located in the surrounding of Paupisi is described here for the first time and is interpreted as a tectonic one. It is around 2 km long, is clearly recognizable for its straightness and represent one of the best preserved surface expression of the Calore river Fault system. This scarp is at least 40 meters high and the collected data testify to an age younger than 100 ka. It also shows clear evidence of recent tectonic activity (younger than 15 ka), represented by minor scarps up to 4 m high, cutting the youngest fan generation. The collected data suggest that the area has been repeatedly interested in the past Fig. 1 – A) Geomorphological map of the study area, B) UAV orthomosaic. In yellow the fault scarp under study; the Stars indicate the stratigraphic sections.