caa a22 4500 477062423 CHVBK 20180405111404.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/s004450050125 doi (NATIONALLICENCE)springer-10.1007/s004450050125 Geochemistry of gases and waters discharged by the mud volcanoes at Paternò, Mt. Etna (Italy) [Elektronische Daten] [G. Chiodini, W. D'Alessandro, F. Parello]  Approximately 20 km south of Mt. Etna craters, at the contact between volcanic and sedimentary formations, three mud volcanoes discharge CO2-rich gases and Na-Cl brines. The compositions of gas and liquid phases indicate that they are fed by a hydrothermal system for which temperatures of 100-150  °C were estimated by means of both gas and solute geothermometry. The hydrothermal system may be associated with CO2-rich groundwaters over a large area extending from the central part of Etna to the mud volcanoes. Numerous data on the He, CH4, CO2 composition of the gases of the three manifestations, sampled over the past 5 years, indicate clearly that variations are due to separation processes of a CO2-rich gas phase from the liquid. The effects of these processes have to be taken into account in the interpretation of the monitoring data collected for the geochemical surveillance of Etna volcano. Springer-Verlag Berlin Heidelberg, 1996 Key words Mud volcanoes nationallicence Fluid chemistry nationallicence Gas separation nationallicence Hydrothermal system nationallicence Volcanic surveillance nationallicence Etna volcano nationallicence Chiodini G. Dipartimento di Scienze della Terra dell' Università di Perugia, Piazza dell'Università, I-06100 Perugia, Italy Fax: ++75 585 32 03, IT aut D'Alessandro W. Istituto di Geochimica dei Fluidi (CNR), via Torino 27d, I-90133 Palermo, Italy, IT aut Parello F. Istituto di Mineralogia, Petrografia e Geochimica, Università di Palermo, via Archirafi 36, I-90123 Palermo, Italy, IT aut https://doi.org/10.1007/s004450050125 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s004450050125 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chiodini G. Dipartimento di Scienze della Terra dell' Università di Perugia, Piazza dell'Università, I-06100 Perugia, Italy Fax: ++75 585 32 03, IT aut NATIONALLICENCE 700 1- D'Alessandro W. Istituto di Geochimica dei Fluidi (CNR), via Torino 27d, I-90133 Palermo, Italy, IT aut NATIONALLICENCE 700 1- Parello F. Istituto di Mineralogia, Petrografia e Geochimica, Università di Palermo, via Archirafi 36, I-90123 Palermo, Italy, IT aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer