Abstract
Analyses were made of the major gases, as well as helium and radon, in fluids from more than 90 geothermal wells in Tuscany. The elementary and isotopic abundances of the noble gases were determined by multiple samplings in seven wells. The results show good correlations between constituents of atmospheric origin and those of deep origin, suggesting the existence of a mixing between cold waters and hot fluids, a process which takes place at considerable depth. The helium isotopic ratios indicate the presence of a radiogenic crustal component. Enrichment of radiogenic argon and excess nucleogenic neon-21 were measured in some samples. Calculations were also made of the 4He/ 222Rn ages of the gas sources.
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