GNGTS 2018 - 37° Convegno Nazionale

256 GNGTS 2018 S essione 1.3 Conclusions. Combination of all petrological and geodetic observations supports the idea that dynamics of magma transfer driving the eruptive episodes of 2017 were a direct consequence of the violent eruptions occurred at Voragine Crater on May 2016, which greatly enhanced the ascent of fresh magma from deep storage zones and improved the efficiency of the plumbing system to transfer it upward to the surface. We propose a mechanism of self-feeding rejuvenation of the volcano plumbing system during 2017, where fresh recharging magmas ascending from depth progressively pushed away the residual ones stored at shallow crustal levels. Support to this inference is given by the nearly flat deformative pattern observed during the early eruptive episodes of February-March 2017. Indeed, the deflation expected as a consequence of magma extrusion did not occur, probably due to the continuous magma injections from depth that balanced eruptive phenomena at the surface. Similarly, a continuous inflationary deformative pattern was recorded since April 2017 albeit conspicuous magma discharges occurred during the April 11, 19 and 27 eruptions. Such a geodetic-petrological integrated analysis affords a powerful tool to gain insights into the main magmatic processes occurring beneath a complex active volcano like Mt. Etna, therefore yielding important scientific advances, and providing interesting future opportunities for volcanological studies. References Cannata A., Di Grazia G., Giuffrida M., Gresta S., Palano M., Sciotto M., Viccaro M. and Zuccarello F.; 2018: Space- Time Evolution of Magma Storage and Transfer at Mt. Etna Volcano (Italy): The 2015–2016 Reawakening of Voragine Crater . Geochem. Geophys. Geosyst., 19, 471-495. Costa F., Dohmen R. and Chakraborty, S.; 2008: Time scales of magmatic processes from modeling the zoning patterns of crystals. Rev. Mineral. Geochem., 69, 545–594. Costa F. and Morgan D.J.; 2010: Time constraints from chemical equilibration in magmatic crystals. In: Dosseto A., Turner S.P., Van Orman J.A.(ed), Timescales of magmatic processes: from core to atmosphere, pp. 125–159 (Wiley, Oxford). Gambino S., Cannata A., Cannav F., La Spina A., Palano M., Sciotto M., Spampinato L., Barberi G.; 2016: The unusual 28 December 2014dike-fed paroxysm at Mount Etna: Timing and mechanism from a multidisciplinary perspective. J. Geophys. Res. Solid Earth, 121, 2037– 2053. Giuffrida M. and Viccaro M.; 2017: Three years (2011–2013) of eruptive activity at Mt. Etna: Working modes and timescales of the modern volcano plumbing system from micro-analytical studies of crystals . Earth Sci. Rev., 171, 289-322. Spampinato L., Sciotto M., Cannata A., Cannav F., La Spina A., Palano M., Salerno G., Privitera E. and Caltabiano, T.; 2015: Multiparametric study of the February–April 2013 paroxysmal phase of Mt. Etna New South-East crater. Geochem. Geophys. Geosyst., 16, 1932–1949. VERTICAL DEFORMATION OF THE CAMPI FLEGREI CALDERA IN THE POZZUOLI BAY DURING THE LAST 10 KY BASED ON HIGH-RESOLUTION SEISMOSTRATIGRAPHIC ANALYSIS C. Marino 1 , L. Ferranti 1 , J. Natale 1 , M. Sacchi 2 1 Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse (DiSTAR), Università “Federico II”, Napoli, Italy 2 Istituto per l’Ambiente Marino Costiero (IAMC), Consiglio Nazionale delle Ricerche (CNR), Napoli, Italy A seismic stratigraphic analysis of very high-resolution single-channel seismic reflection profiles provided insights into the last ~10 ky vertical deformation pattern in the submerged part of the Campi Flegrei resurgent caldera, off the Pozzuoli Bay. The collapse of the central part of the Campi Flegrei is associated with the eruption of the Neapolitan Yellow Tuff (NYT) at ~15 ky BP and was followed by discrete phases of intra-caldera volcanic activity and resurgence (Di Vito et al. , 1999; Marturano et al. , 2018). Despite the volcanic and tectonic evolution of