Surface-subsurface structural architecture and groundwater flowof the Equi Terme hydrothermal area, northern Tuscany Italy

Molli, Giancarlo; Doveri, Marco; Manzella, Adele; Bonini, Livio; Botti, Flavia; Menichini, Matia; Montanari, Domenico; Trumpy, Eugenio; Ungari, Alino; Vaselli, L.

doi:10.3301/ijg.2014.25

Cited by 21 publications

(18 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mesozoic carbonate rocks are the main target for the exploration and exploitation of low-to-medium enthalpy geothermal systems in Italy (e.g. 7,8,[86][87][88][89].…”

Section: Resultsmentioning

confidence: 99%

Crustal structure of Sicily from modelling of gravity and magnetic anomalies

Milano

Kelemework

Manna

et al. 2020

Sci Rep

View full text Add to dashboard Cite

We aim at modeling the main crustal and thermal interfaces of Sicily (Italy), a key area for understanding the geological complexity at the collisional boundary between the African and European plates. To this end, we analyze the gravity and magnetic fields, integrated with information from well logs, geology, heat flow, and seismic data. In order to make the most accurate description of the crustal structure of the area, we modeled with different methodologies the carbonate and crystalline top surfaces, as well as the Moho and the Curie isotherm surface. The reconstruction of the carbonate platform is achieved using a nonlinear 3D method constrained by the available seismic and borehole data. The crystalline top, the Curie, and the Moho are instead estimated by spectral analysis of both gravity and magnetic data. The results show a complex carbonate basement and a deep crystalline crust in central Sicily, with a prominent uplift beneath the Hyblean Plateau. Maps of the Moho and the Curie isotherm surface define a variable thermal and structural setting of Sicily, with very thin crust in the southern and eastern sectors, where high heat flow is found, and deep and cold crust below the Caltanissetta Basin.

show abstract

“…Mesozoic carbonate rocks are the main target for the exploration and exploitation of low-to-medium enthalpy geothermal systems in Italy (e.g. 7,8,[86][87][88][89].…”

Section: Resultsmentioning

confidence: 99%

Crustal structure of Sicily from modelling of gravity and magnetic anomalies

Milano

Kelemework

Manna

et al. 2020

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The hydrogeological setting of the northern Apennines is dominated by medium-low to low permeability units (clay or marly geological formations), which in many cases are considered as to be aquitard or aquicludes [43][44][45]. The exceptions are the main aquifers of the region, which are hosted within the metamorphic dolostones and limestones of the Apuan Alps ("Grezzoni" and "Carrara Marbles" Fms.).…”

Section: Climatic Geological and Hydrogeological Setting Of The Studmentioning

confidence: 99%

“…The latter are drained by more than 80 springs with flow rates ranging from 10 to 1600 L/s on average [12,46]. Other remarkable aquifer systems include gypsum rock masses in the Emilian Apennines [47] and the limestone and cherty limestone of the Tuscan Nappe [45]. In any case, such aquifers are uncommon, because most of the springs are fed by shallow and unconfined aquifers hosted within highly tectonized and fractured flysch rock masses and sandstones [48,49], especially if affected by deep gravitational mass movements [50].…”

Section: Climatic Geological and Hydrogeological Setting Of The Studmentioning

confidence: 99%

“…During the recession period, flow-rates are fed only by the groundwater, as infiltration does not occur within the unsaturated zone, being that evapotranspiration processes are active (Figure 3b). Lastly, there are a few rare examples of deep, highly mineralized springs and thermal springs in the area, which are located in zones characterized by peculiar geological structures such as tectonic windows and regional thrusts [45,52].…”

Section: Climatic Geological and Hydrogeological Setting Of The Studmentioning

confidence: 99%

See 1 more Smart Citation

Estimating the Isotopic Altitude Gradient for Hydrogeological Studies in Mountainous Areas: Are the Low-Yield Springs Suitable? Insights from the Northern Apennines of Italy

Tazioli

Cervi²,

Doveri

et al. 2019

Water

View full text Add to dashboard Cite

Several prior studies investigated the use of stable isotopes of water in hydrogeological applications, most on a local scale and often involving the isotopic gradient (evaluated by exploiting the so-called altitude effect), calculated on the basis of rainwater isotopes. A few times, this gradient has been obtained using the stable isotopic contents of low-yield springs in a limited time series. Despite the fact that this method has been recognized by the hydrogeological community, marked differences have been observed with respect to the mean stable isotopes content of groundwater and rainwater. The present investigation compares the stable isotopic signatures of 23 low-yield springs discharging along two transects from the Tyrrhenian sea to the Po Plain of Italy, evaluates the different isotopic gradients and assesses their distribution in relation to some climatic and topographic conditions. Stable isotopes of water show that groundwater in the study area is recharged by precipitation and that the precipitation regime in the eastern portion of the study area is strongly controlled by a shadow effect caused by the Alps chain on the air masses from central Europe. Stable isotopes (in particular the δ18O and deuterium excess (d-excess) contents together with the obtained isotopic gradients) allow us to identify in the study area an opposite oriented orographic effect and a different provenance of the air masses. When the windward slope is located on the Tyrrhenian side, the precipitation shows a predominant oceanic origin; when the windward slope moves to the Adriatic side, the precipitation is characterized by a continental origin. The main results of this study confirm the usefulness of low-yield springs and the need for a highly detailed survey-scale hydrological investigation in the mountainous context.

show abstract

“…Mineral water springs are typically located in tectonically active areasandare frequently associated with fracture zones [1]. Well known examples are recorded in Turkey [2,3], Iran [1,4], Serbia [5,6], Tunisia [7,8], Mexico [9,10], China [11,12], Korea [13][14][15], Portugal [16,17], Spain [18], Italy [19], France [20,21], Egypt [22,23] and Russia [24,25] amongst other places.…”

Section: Introductionmentioning

confidence: 99%

Geothermometry and Isotope Geochemistry of CO2-Rich Thermal Waters in Choygan, East Tuva, Russia

Shestakova

Гусева

Kopylova

et al. 2018

Water

View full text Add to dashboard Cite

The Choygan area of southern Siberia, Russia hosts a variety of CO 2-rich thermal mineral and other waters emerging from springs at temperatures between 7 • C and 39 • C. Chemical analyses of the spring waters (n = 33) were carried out to characterise the waters and determine their origin. A continuum of compositions was observed between relatively lower temperature (7 • C) HCO 3-Ca-Na dominated waters with relatively low amount of total dissolved solids (TDS) and high Eh, and higher temperature (39 • C) HCO 3-Na-Ca dominated waters with higher TDS and lower Eh-this reflects largely conservative mixing of these components between near surface low temperature, oxidising groundwaters and higher temperature, more reducing thermal waters derived from a deeper geothermal reservoir. Stable isotopic data are consistent with all the water ultimately being derived from meteoric water that has undergone varying degrees of isotopic fractionation following evaporation. The inferred δ 18 O and δ 2 H isotopic composition of the unfractionationed meteoric waters is lighter than that expected that of mean annual local precipitation, which together with a strong negative correlation between δ 18 O and the elevation of the sampled discharging springs, suggests recharge at higher elevations (1600 m to 3000 m; average 2600 m). Reservoir temperature, calculated using geothermometers and an analysis of saturation indices of plausible reservoir minerals, ranged from 70 • C to 100 • C at an inferred depth of 2 to 3 km. Not all chemical components were found to follow conservative mixing behaviour. In particular, (i) the CO 2 contents of the waters were highly variable, suggesting either varying degrees of degassing and/or near discharge admixture with air, and (ii) SO 4 concentrations in the lower temperature thermal CO 2-rich waters were highly variable, suggesting a role of near surface oxidation processes, for example of pyrite, in modifying the concentration of redox sensitive components. Limited δ 13 C data are consistent with the CO 2 predominately being derived from dissolution of metamorphic/igneous carbonate minerals in the reservoir. Based on geological conditions, isotope and chemical data, a conceptual circulation model of the Choygan hydrothermal system is proposed.

show abstract

Surface-subsurface structural architecture and groundwater flowof the Equi Terme hydrothermal area, northern Tuscany Italy

Cited by 21 publications

References 50 publications

Crustal structure of Sicily from modelling of gravity and magnetic anomalies

Crustal structure of Sicily from modelling of gravity and magnetic anomalies

Estimating the Isotopic Altitude Gradient for Hydrogeological Studies in Mountainous Areas: Are the Low-Yield Springs Suitable? Insights from the Northern Apennines of Italy

Geothermometry and Isotope Geochemistry of CO2-Rich Thermal Waters in Choygan, East Tuva, Russia

Contact Info

Product

Resources

About