evidence for mixing between fluids exsolved at different depths in the magmatic system of Mt Etna (Italy). Geochimica et Cosmochimica Acta, Elsevier, 2012Elsevier, , 84, pp.380-394. <10.1016Elsevier, /j.gca.2012.01.028>. 3 1 GEOCHEMICAL EVIDENCE FOR MIXING BETWEEN FLUIDS EXSOLVED AT DIFFERENT DEPTHS IN THE MAGMATIC SYSTEM OF MT ETNA (ITALY)A

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We present unprecedented data of real-time measurements of the concentration and isotope composition of CO 2 in air and in fumarole-plume gases collected in 2013 during two campaigns at Mount Etna volcano, which were made using a laser-based isotope ratio infrared spectrometer. We performed approximately 360 measurements/h, which allowed calculation of the δ 13 C values of volcanic CO 2 . The fumarole gases of Torre del Filosofo (2900 m above sea level) range from À3.24 ± 0.06‰ to À3.71 ± 0.09‰, comparable to isotope ratio mass spectrometry (IRMS) measurements of discrete samples collected on the same dates. Plume gases sampled more than 1 km from the craters show a δ 13 C = À2.2 ± 0.4‰, in agreement with the crater fumarole gases analyzed by IRMS. Measurements performed along~17 km driving track from Catania to Mount Etna show more negative δ 13 C values when passing through populated centers due to anthropogenic-derived CO 2 inputs (e.g., car exhaust). The reported results demonstrate that this technique may represent an important advancement for volcanic and environmental monitoring.

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