Istituto di Geoscienze e Georisorse     
Cioni R., Corazza E., Marini L. The gas/steam ratio as indicator of heat transfer at the Solfatara fumaroles, Phlegraean fields (Italy). In: Bulletin of Volcanology, vol. 47 (2) pp. 295 - 302. Springer, 1984.
A simple geochemical model of Solfatara, Phlegraean Fields (Italy), is proposed on the basis of gas composition and temperature at the surface. Data on the Solfatara fumaroles have been collected since 1979 within the framework of a geochemical monitering for the surveillance of the Phlegraean volcanic system. Surface manifestations of Solfatara are likely to be fed through isoenthalpic expansion of dry steam, which separates from a geothermal liquid in an intensively fractured zone at about 236C. This value is consistent both with gas composition and surface temperature. The gas/steam ratio appears te be the most effective parameter to detect changes of heat flow at depth. Actually a remarkable decrease in the gas/steam ratio has been observed since 1981, while the gas composition and the temperature did not change significantly. These facts suggest increased heat flow at depth.
URL: http://www.springerlink.com/content/xjn730116032u76m/
DOI: 10.1007/BF01961560
Subject Italy
Phlegraean fields
gas-steam ratio
geochemical model

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