GNGTS 2017 - 36° Convegno Nazionale

GNGTS 2017 S essione 1.3 191 oscillatory zoning (Type 1); b) pervasive dissolution/resorption textures (Type 2); rare patchy textures (Type 3); c) coarse-sieve textures at the plagioclase core (Type 4); d) sieve textures at the crystal rim (Type 5). Olivine crystals found in lavas and tephra emitted at VOR exhibit various types of zoning from core to rim as other recent crystals of the 2011-2013 period (Giuffrida and Viccaro, 2017). Based on the olivine core composition, we have grouped into five olivine populations (OP) the recognized crystal types: OP1) coresat Fo83-84; OP2) Fo80- 82; OP3) Fo78; OP4) Fo75-76; OP5) Fo70-73. Discussion and concluding remarks. The integration of ground deformation, seismic and infrasonic data allows reconstructing the magma dynamics within the plumbing system from a few km bsl up to the shallowest portions, corresponding with the summit craters. Modelling of ground deformation for each recognized stage allowed us to infer the presence of a magmatic reservoir located at a depth of ~5.5 km bsl. Such a reservoir can be considered as a permanent zone of magma storage at Mt. Etna given its recurrent activity over the last decade (see Viccaro Fig. 2 - Simplified sketch model of the different portions of Mt. Etna plumbing system, highlighted by geophysical and petrological data.