ISSN:
1432-0819
Keywords:
Key words Mud volcanoes
;
Fluid chemistry
;
Gas separation
;
Hydrothermal system
;
Volcanic surveillance
;
Etna volcano
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s004450050125
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