GNGTS 2022 - Atti del 40° Convegno Nazionale

GNGTS 2022 Sessione 3.2 459 MULTIDISCIPLINARY STUDY OF NON-VOLCANIC DEGASSING VENT FIELD IN THE SOLOPACA AREA (SOUTHERN APENNINES) C. De Paola 1 , S. Albanese 1 , M. Ambrosino 2 , S. Ciarcia 2 , D. Cicchella 2 , R. Di Maio 1 , C. Fabozzi 2 , P. Notaro 3 , F. Pagliara 1 , E.P. Prinzi 4 , R. Salone 1 , S. Vitale 1 1 Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse, Università di Napoli Federico II, Napoli, Italy 2 Dipartimento di Scienze e Tecnologie, Università degli Studi del Sannio, Benevento, Italy 3 EalCUBO (Environment, Earth, Engineering) Soc. Coop., Arcavacata, Cosenza, Italy 4 Dipartimento per il Servizio Geologico d’Italia,ISPRA, Roma, Italy Introduction. In the southern Apennines (Fig. 1a), evidence of non-volcanic degassing is widespread reported (Ascione et al. , 2018; Di Maio et al. , 2021 and references therein). Geochemical surveys indicate that the gases are mainly formed by CO 2 (Ascione et al. , 2018). In particular, degassing vents are focused along the SW margin of the Matese Mts (Fig. 1a). The main vents are located at north in Ciorlano, Pratella and Ailano areas (Ascione et al. , 2018; Di Maio et al. , 2021), and at south in the Telese-Solopaca sector (Fig. 1a). The CO 2 flux reaches high values in these areas, with the Ciorlano vent being one of the world’s highest non-volcanic CO 2 fluxes (Ascione et al. , 2018). Geophysical investigations on these non-volcanic vents (De Paola et al. , 2019; Di Maio et al. , 2021) mark a close relation between degassing and tectonics, indicating that the fluids migrate upward along preferred pathways corresponding to damage and cataclastic zones of major faults. The SW margin of the Matese Mts is delimited by the Southern Matese Fault (SMF; Boncio et al. , 2022) system characterized by different segments with dominant normal kinematics that lowered the SW area (Alife and Telese plains; Fig. 1a). Fig. 1 - (a) Geological map of the southern Matese Mts (after Vitale and Ciarcia, 2018 modified). (b) DTM of the Telese-Solopaca area. (c) Geological map of the study area. Historical seismicity occurs along the southern margin of Matese Mts, including the ancient earthquake that occurred in 346 CE (M 7.0) that Boncio et al. (2022) indicate as resulting from the reactivation of the entire SMF system. Despite the historical earthquake occurrences, instrumental seismic activity is presently negligible. The SMF system seems to continue southward, bounding the hills northward of Solopaca town (Boncio et al. , 2022); however, geological evidence is a few, and in general, the area is poorly studied. Hence, we analyzed the area northward of the Solopaca town where a CO 2 degassing vent field occurs, never studied before. We performed stratigraphic, structural, geophysical and geochemical investigations in order to reconstruct the tectonic architecture of the area and shed light on the possible southward prosecution of the SMF system.