A new geophysical contribution to the study of the campidano geothermal area (Sardinia, Italy)

Balia, Roberto; Ciminale, Marcello; Loddo, M.; Patella, D.; Pecorini, G.; Tramacere, A.

doi:10.1016/0375-6505(91)90012-k

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…The Bouguer map is dominated by a negative anomaly, extending approximately NW-SE from Oristano to Decimomannu (nearby Uta in Fig. 1), that was correlated with magnetometric data, and may be related to the Tertiary filling of the Campidano, made up of Miocene-Pliocene sediments Balia et al 1984Balia et al , 1991. Gravity highs correspond predominantly to outcrops of the Paleozoic crystalline basement and to the Tertiary andesitic rocks.…”

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confidence: 61%

“…Detailed geothermal investigations in the Campidano were carried out in the 1980s, in the framework of projects funded by the European Community and the Italian National Research Council (e.g. Bertorino et al 1982a, b;Pala et al 1982;Caboi et al 1983;Balia et al 1984Balia et al , 1991D'Amore et al 1987). In the Campidano Graben, the main thermal manifestations occur at Santa Maria Is Acquas Sardara (60 °C, Balia et al 1985), S'Acquacotta Villasor (46 °C, Bertorino et al 1982a), Su Campu Monastir (43 °C, Frau 1994 and Sa Guardia Uta (34 °C, Bertorino et al 1982a), which locations can be seen in Fig.…”

Section: Thermal Manifestationsmentioning

confidence: 99%

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Characterization of low-enthalpy geothermal resources and evaluation of potential contaminants

Frau

Cidu

Ghiglieri

et al. 2020

Rend. Fis. Acc. Lincei

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confidence: 61%

Section: Thermal Manifestationsmentioning

confidence: 99%

Characterization of low-enthalpy geothermal resources and evaluation of potential contaminants

Frau

Cidu

Ghiglieri

et al. 2020

Rend. Fis. Acc. Lincei

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“…8 Conceptual model of present groundwater circulation in the Campidano Graben. The geological cross-section is modified after Balia et al (1991). (1) Palaeozoic granitic rocks; (2) Palaeozoic schists; (3) Oligo-Miocene volcanics; (4) Miocene marine sediments; (5) Pliocene continental deposits.…”

Section: Discussionmentioning

confidence: 99%

Fluid Geochemistry as Indicator of Tectonically-Related, Deep Water Circulations in the Sardinian Rift-Campidano Graben (Italy): New Insights from Environmental Isotopes

et al. 2008

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The EC funded Geochemical Seismic Zonation program (EEC GSZ Project 1996-1998 chose Sardinia as a low-seismicity site, in which the relationships between fluid geochemistry and seismo-tectonics had to be investigated and results compared with outcomes from other selected high-seismicity sites. A first article, examining the role of fault segmentation and seismic quiescence on the geochemical composition of groundwaters and gases, has already been presented (Angelone et al. 2005). This article deals with environmental isotopes which, together with selected hydrochemical data, give hints on tectonically-related fluid circulations. Four water-dominated hydrothermal systems were considered, all located along regional fault systems and discharging groundwaters belonging to the Na-HCO 3 and Na-Cl facies. In the considered systems, groundwater circulation takes place, principally, in the Palaeozoic Crystalline Basement (PCB), with the exception of the Logudoro system, where hydrological circuits develop in the Mesozoic Carbonate Platform (MCP). The high CO 2 contents, the non-attainment of fluid-rock equilibrium and the large lithological variability prevent the construction of a unique hydrogeological-geochemical conceptual model. In this case, stable isotopes provide a useful tool to describe the origin of fluids and their subterranean movements. Stable isotopes of water, integrated with hydrochemical data, indicate that fluids are derived from three main end members. The dominant component is a relatively recent local meteoric water; the second one is marine water; and the third one is a fossil freshwater, depleted in heavy isotopes with respect to modern rains. The latter end member entered the aquifer system in the past, when climatic conditions were greatly different from today. At least two circulation systems can be recognised, namely a shallow cold system and a deep hydrothermal system, as well as two distinct hydrological processes: (1) gravity-controlled descent of cold water towards greater depths and (2) convection linked to a thermal gradient, causing deep fluids to rise up from the hydrothermal reservoir towards the surface. The highly variable d 13 C TDIC values suggest the presence of two distinct CO 2 sources, namely, a biogenic one and a thermogenic one. The relation between the isotopic compositions of CO 2 and He indicates an increased mantle signature in uprising CO 2 -rich fluids.

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“…Based on the many field surveys in Italian geothermal areas using d'c' and MT methods (Patella et al1979(Patella et al ,1980Patella 1982;Monaco et a|.1986;Balia et al' 1988Balia et al' ' 1990Balia et al' . 1991Patella et al l99I;Coppola et al 1993), we think it relevant to the discussion of the MT dispersion features to study the 2D single-sided section of a complete geothermal system shown in Fig.…”

Section: The Geothermal System Modelmentioning

confidence: 99%

The magnetotelluric response over 2D media with resistivity frequency dispersion¹

Mauriello

Patella

Siniscalchi³

1996

Geophysical Prospecting

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We investigate the magnetotelluric response of two-dimensional bodies, characterized by the presence of low-frequency dispersion phenomena of the electrical parameters. The Cole-Cole dispersion model is assumed to represent the frequency dependence of the 'impedivity' complex function, defined as the inverse of Stoyer's 'admittivity' complex parameter. To simulate real geological situations, we consider three structural models, representing a sedimentary basin, a geothermal system and a magma chamber, assumed to be partially or totally dispersive. From a detailed study of the frequency and space behaviours of the magnetotelluric parameters, taking known non-dispersive results as reference, we outline the main peculiarities of the local distortion effects, caused b-v the presence of dispersion in the target media. Finally, we discuss the interpretative errors which can be made by neglecting the dispersion phenomena. The apparent dispersion function, which was defined in a previous paper to describe similar effects in the one-dimensional case, is again used as a reliable indicator of location, shape and spatial extent of the dispersive bodies. The general result of this study is a marked improvement in the resolution por'ver of the magnetotelluric method. lntroduction A great variety of laboratory and field experiments, carried out in different physical and geological conditions, have clearly revealed that the electrical properties ofrocks very often depend, to a greater or lesser extent, on the time and frequencl, behaviour of the exciting (natural or artificial) electromagnetic (EM) fields. Resistivity, which is the chief parameter in most conventional EM prospecting methods, and, for the purpose of this article, variable-frequency input fields, are both usually included in the categor-v of dispersion phenomena.

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A new geophysical contribution to the study of the campidano geothermal area (Sardinia, Italy)

Cited by 6 publications

References 8 publications

Characterization of low-enthalpy geothermal resources and evaluation of potential contaminants

Characterization of low-enthalpy geothermal resources and evaluation of potential contaminants

Fluid Geochemistry as Indicator of Tectonically-Related, Deep Water Circulations in the Sardinian Rift-Campidano Graben (Italy): New Insights from Environmental Isotopes

The magnetotelluric response over 2D media with resistivity frequency dispersion¹

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A new geophysical contribution to the study of the campidano geothermal area (Sardinia, Italy)

Cited by 6 publications

References 8 publications

Characterization of low-enthalpy geothermal resources and evaluation of potential contaminants

Characterization of low-enthalpy geothermal resources and evaluation of potential contaminants

Fluid Geochemistry as Indicator of Tectonically-Related, Deep Water Circulations in the Sardinian Rift-Campidano Graben (Italy): New Insights from Environmental Isotopes

The magnetotelluric response over 2D media with resistivity frequency dispersion1

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The magnetotelluric response over 2D media with resistivity frequency dispersion¹