Geochemistry of gases and waters discharged by the mud volcanoes at Paternò, Mt. Etna (Italy) |
| |
| Authors: | G Chiodini W D'Alessandro F Parello |
| |
| Institution: | (1) Dipartimento di Scienze della Terra dell' Università di Perugia, Piazza dell'Università, I-06100 Perugia, Italy Fax: ++75 585 32 03, IT;(2) Istituto di Geochimica dei Fluidi (CNR), via Torino 27d, I-90133 Palermo, Italy, IT;(3) Istituto di Mineralogia, Petrografia e Geochimica, Università di Palermo, via Archirafi 36, I-90123 Palermo, Italy, IT |
| |
| Abstract: | 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.
Received: 4 September 1995 / Accepted: 14 February 1996 |
| |
| Keywords: | Mud volcanoes Fluid chemistry Gas separation Hydrothermal system Volcanic surveillance Etna volcano |
| 本文献已被 SpringerLink 等数据库收录！ |
|
