“…Amiata geothermal fields (Batini et al, 2003 and references therein) and a large number of gas(CO 2 -H 2 S)-rich thermo-mineral springs (Minissale, 2004;Minissale et al, 1997, and references therein). This tectonic setting results from the convergence and collision (CretaceousEarly Miocene) between the Adria Plate and the SardiniaCorsica Massif with the consequent stacking of the tectonic units and their subsequent compression (to the East) and extension (to the West) from the Early-Middle Miocene to Present (Elter et al, 1975;Carmignani et al, 1995Carmignani et al, , 2001, and references therein) and late-Apenninic magmatism Lattanzi et al, 1994;Costagliola et al, 2008). Historically-exploited base metal-sulfur ore deposits and S-bearing mineralizations that form the mining district of Colline Metallifere, are hosted within sedimentary and Palaezoic (phyllites) and Triassic (dolostone and gypsum/anhydrite) rocks that are covered by Ligurian Units produced by an extensional detachment occurring in Middle-Late Miocene (Arisi Rota and Vighi, 1971;.…”