Thermodynamic behaviour of the Bagnore geothermal field

Diagenesis versus hydrothermalism and fluid–rock interaction within the Tuscan Nappe of the Monte Amiata CO2‐rich geothermal area (Italy)

“…before exploitation) estimated by Atkinson et al . () of about 175°C, thus similar to the Th mode (165°C) of FLUID‐2. The shallow reservoir of the Bagnore field was initially characterized by the presence of a gas cap, mainly composed by CO 2 (up to 80%) and steam, which overlaid an aqueous CO 2 ‐saturated liquid.…”

“…Battaglia et al (2007) explain such changes as due to hydrothermal fluid circulation, activated by a geothermal anomaly, under typical diagenetic conditions (175 AE 25°C). Also the initial temperature of the shallow carbonate-evaporite reservoir of the Bagnore geothermal field was estimated to be of about 175°C (Atkinson et al 1978). These temperature values are comparable with homogenization temperatures of FLUID-2 (in the assumption of a shallow hydrothermal system, the Th pressure correction is irrelevant).…”

“…Also the initial temperature of the shallow carbonate–evaporite reservoir of the Bagnore geothermal field was estimated to be of about 175°C (Atkinson et al . ). These temperature values are comparable with homogenization temperatures of FLUID‐2 (in the assumption of a shallow hydrothermal system, the Th pressure correction is irrelevant).…”

“…A further similarity arises from the fact that in the Bagnore shallow reservoir, the CO 2 as well as the carbonate ionic species was in chemical equilibrium with the carbonate rocks (Atkinson et al . ). Similarly, a strong interaction between FLUID‐2 and host rocks has been documented, this suggesting possible equilibrium.…”

Differential absorption lidar mapping of atmospheric atomic mercury in Italian geothermal fields

“…The stratigraphic sequence in the Larderello and Mt. Amiata geothermal fields are characteristic of Central-Southern Tuscany (Atkinson et al, 1977). Starting with the deepest terrains known in this area, we have: an upper terrigenous complex (Tuscan series), with at its base, a shaly formation (Scaglia), overlain by Nummulite-bearing calcarenites and, in some places, sandstones (Macigno) (Eocene-Oligocene); d) a mainly shaly flysch facies complex, contammg marly and arenaceous formation ("Alberese-Pietra-forte" group) (Cretaceous-Eocene); e) a mainly clay complex of the Lower-Middle Pliocene, lying unconformably over all the lower complexes.…”