Geothermal gradient and heat flow in the radicofani region (East of Monte Amiata, Italy)

Burgassi, P.D.; Cerón, Patricia; Ferrara, G.; Sestini, G.; Toro, B.

doi:10.1016/0375-6505(70)90042-8

Cited by 11 publications

(2 citation statements)

References 3 publications

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“…The area (about 50 km south of Siena) is affected by an anomalous geothermal gradient (ranging from 300 up to 400 °C/km; e.g. Burgassi et al 1970;Calamai et al 1970) and high heat fluxes (up to 600 mW/m 2 ; Baldi et al 1995), being these features intimately linked to the presence of the Quaternary Mt. Amiata volcano-plutonic system (Gianelli et al 1988).…”

Section: The Mt Amiata Geothermal Field and Mining Districtmentioning

confidence: 99%

The acidic waters in Italy: a brief overview

Magi¹,

Cabassi

Capecchiacci

et al. 2018

AS-ITJGW

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The present study is aimed at providing a brief overview of the Italian acidic waters based on literature and unpublished data. Acidic waters in Italy, as elsewhere, are relatively common and associated with extremely variable geological settings. Owing to their peculiar features, these waters may seriously affect the environment and the ecosystems. Along the Apennine belt, the western and inner sectors of the Italian peninsula record an anomalous geothermal gradient, mostly overlapping with the Neogene-to-present magmatism, that explains the presence of a huge amount of CO2(H2S)-rich gas and thermal water discharges, geothermal fields (e.g. Larderello and Mt. Amiata) and ore deposits (e.g. Fe- and polymetallic sulfides, e.g. Elba Island and Colline Metallifere). Acidic waters (pH ≤5) from volcanic and geothermal areas show outlet temperatures and Total Dissolved Solids (TDS) from 10 to 96°C and <1 to ≈30 g/L, respectively, with a chemical composition usually belonging to the Ca-SO4, NH4-SO4 or Na-Cl facies. Frequently, they are related to bubbling and boiling pools due to the interaction between deepsourced gases and shallow aquifers or meteoric waters. Concentrations of heavy metals and metalloids are in most cases high. Extremely high contents of metals are also recorded for those acidic waters that characterize the main Italian mining districts, mostly located in Sardinia (not included in the present study), Tuscany and NW Alps, where they are related to Acid Mine Drainage l.s. or Acid Rock Drainage. The pH values are as low as 2.08, with variable TDS concentrations. Compositionally, they are Na-SO4, Ca(Mg)-SO4, and/or Mg(Ca)-SO4 waters, prevalently due to oxidative processes affecting polymetallic sulfides.

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Section: The Mt Amiata Geothermal Field and Mining Districtmentioning

confidence: 99%

The acidic waters in Italy: a brief overview

Magi¹,

Cabassi

Capecchiacci

et al. 2018

AS-ITJGW

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“…In some areas, particularly in those where magmatic bodies are at relatively shallow depth, the heat flow may reach a value which is 10-20 times its average value (Burgassi et al 1970;Hayakawa 1970;Dawson & Dickinson 1970).…”

Section: Introductionmentioning

confidence: 99%

Energy in the 1980s - Geothermal power

Leardini¹,

Falcon²

1974

Phil. Trans. R. Soc. Lond. A

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This paper deals mainly with the development of utilization of endogenous fluids in the world and particularly in Italy, together with a forecast of the potential increase in geothermal production. At the end of 1972 the installed capacity of the world’s geothermoelectric plants was approxim ately 1000 M W , of which 390.6 M W are installed in Italy. In the same year the electric energy generated by Italian power stations was 2582.4 GW h. In some countries, geothermoelectric energy costs ranged from 1.4 to 2.5 U.S. mills/M J (5 to 9 mills/kW h) as com pared with 1.66-3.9 U.S. mills/M J (6-14 mills/ kW h) for alternative sources. T he total geothermal capacity in the world is expected to double and perhaps to triple in the 1980s, as new installations are being constructed or planned in several therm al areas. The utilization of geothermal fluids for evaporating low-boiling liquids (freon, isobutane, etc.) or for driving a gravim etric loop, offers attractive possibilities of using therm al waters also for the generation of electricity. In many countries, low enthalpy fluids are used directly for other purposes (domestic and greenhouse heating, refrigeration and air-conditioning, production of fresh water, drying seaweeds and diatomites, etc.). The cost of geothermal heat thus employed is 0.7-1.2 $/GJ as com pared with about 2.6 $/GJ if fossil fuels are used. Due to this attractive cost, in the next few years there should be a rem arkable development in this type of utilization of low enthalpy fluids.

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Geophysics in geothermal prospecting

Duprat

1985

Int. J. Energy Res.

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Geophysical prospecting of high temperature geothermal reservoirs aims at identifying either fluid trapping structures or anomalies related to the properties of the hydrothermal fluid and rock to fluid interactions. Two types of reservoir environments can be characterized: (i) sedimentary reservoirs when a carbonate reservoir is generally capped by a dominantly argillaceous, hydraulically impervious and thermally insulating cover, and (ii) volcanic and volcano‐sedimentary reservoirs associated with hydrothermally altered areas. Based on the aforementioned exploration goals and reservoir settings, a wide spectrum of geophysical methods can be applied whose selection is largely commanded by local geological conditions and expected reservoir morphology. Major geophysical techniques are reviewed and their potential, as to geothermal reservoir prospecting issues, discussed.

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Geothermal gradient and heat flow in the radicofani region (East of Monte Amiata, Italy)

Cited by 11 publications

References 3 publications

The acidic waters in Italy: a brief overview

The acidic waters in Italy: a brief overview

Energy in the 1980s - Geothermal power

Geophysics in geothermal prospecting

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