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Unità Tecnica per le Fonti di Enertgia Rinnovabili – ENEA
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- PublicationRestrictedHydrogeological study and numerical model of the Suio-Castelforte hydrothermal area (central Italy)(2016)
; ; ; ; ; ; ; ; ; ; ; ; ; A numerical simulation has been performed through the natural geothermal system of Suio-Castelforte (LT) in order to investigate the hydothermal area and assess its geothermal potentiality. Starting from geological and hydrogeological data a 2D conceptual model has been built. For numerical purpose, the latter idealizes and simplifies the natural system. The area has been affected by a temperature gradient, from low to medium enthalpy, related to the Quaternary volcanism. By a FEM (Finite Element Model) method, using the COMSOL MULTIPHYSICS® software, a homogeneous and isotrope media have been assumed, simulating the groundwater flow and simultaneous heat transfer. Using the porous media approach, Darcy and heat transfer laws have been applied in steady-state conditions. The results have been compared with the collected data and bibliography.104 5 - PublicationRestrictedA hydrogeological conceptual model of the Suio hydrothermal area (central Italy)(2017-03-17)
; ; ; ; ; ; ; ; ;Saroli, M.; Università degli studi di Cassino e del Lazio meridionale ;Lancia, M.; Università degli studi di Cassino e del Lazio meridionale ;Albano, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Casale, A.; Università degli studi di Cassino e del Lazio meridionale ;Giovinco, G.; Università degli studi di Cassino e del Lazio meridionale ;Petitta, M.; DST-Dipartimento di Scienze della Terra, Sapienza Università di Roma ;Zarlenga, F.; Unità Tecnica per le Fonti di Enertgia Rinnovabili – ENEA ;dell'Isola, M.; Università degli studi di Cassino e del Lazio meridionale; ; ; ; ; ; ; A hydrogeological conceptual model has been de- veloped that describes the hydrothermal system of Suio Terme (central Italy). The studied area is located along the peri- Tyrrhenian zone of the central Apennines, between the Mesozoic and Cenozoic carbonate platform sequences of the Aurunci Mountains and the volcanic sequences of the Roccamonfina. A multi-disciplinary approach was followed, using newhydrogeological surveys, the interpretation of strat- igraphic logs of boreholes and water wells, and geophysical data—seismic sections, shear-wave velocity (Vs) crustal mod- el and gravimetric model. The collected information allowed for construction of a conceptual hydrogeological model and characterization of the hydrothermal system. The Suio hydro- thermal system is strongly influenced by the Eastern Aurunci hydrostructure. Along the southeastern side, the top of the hydrostructure sinks to −1,000 m relative to sea level via a series of normal faults which give origin to the Garigliano graben. Geological and hydrogeological data strongly suggest the propagation and mixing of hot fluids, with cold waters coming from the shallow karst circuit. The aquitard distribution, the normal tectonic displacements and the frac- turing of the karst hydrostructure strongly influence the hy- drothermal basin. Carbon dioxide and other gasses play a key role in the whole circuit, facilitating the development of the hydrothermal system. The current level of knowledge sug- gests that the origin of the Suio hydrothermalism is the result of interaction between the carbonate reservoir of the Eastern Aurunci Mountains and the hot and deep crust of this peri- Tyrrhenian sector, where the Roccamonfina volcano repre- sents174 12 - PublicationRestrictedEnrichment in Heavy Metal (HM) and Rare Earth Element (REE) in Fluvial Placer Deposits: Case Study of Zambesi River (Mozambique)(2016-05-05)
; ; ; ; ; ; ; ; ;; ; Mozambique has a huge mineral potential that is largely untapped. Tantalum-niobium, other rare metals, gold and semiprecious stones are abundant. Deposits of heavy mineral sands and a wide range of industrial minerals comprise a few of the mineral wealth in Mozambique that are under development. One of the most interesting zones of Mozambique is definitely the Zambezi River, where the placers deposits are rich in HM and REE. For this reason, ENEA in 2013 has performed an extensive multidisciplinary research along the Lower Zambezi, in cooperation with the Minas Rio Bravo Company (Mozambique). The aim of the research is to verify the REE and heavy metal abundances by measuring geochemical and mineralogical characteristics of the sediments from the bottom of the Zambezi, in the area between Tete and Tambara cities. The analyses were carried out at the Department of Physics and Earth Science of Ferrara University by X-ray fluorescence analysis, X-ray diffraction analysis and pycnometer method. The result of XRD shows that the main minerals are quartz and feldspar. Unfortunately, the XRD peak of the main mineral phases covers up the others. However, chemical analyses reveal high presence of Iron and Titanium oxides and trace elements, as Cesium, Chromium and Lanthanum, suitable for industrial mining purposes. Furthermore, the data of density are comparable to the detecting phases found with XRD. The goal of the survey is to determinate the economic value of the Zambezi sediments for industrial minerals sector. Secondly, the results are important to improve the geochemical and mineralogical knowledge of this zone.437 4 - PublicationOpen AccessPreliminary fluid geochemical survey in Tete Province and prospective development of geothermics in Mozambique(2022)
; ; ; ; ; ; ; ; ;; ; ; ;An evaluation of the feasible development of geothermal energy in Mozambique is proposed based on some thermal springs geochemical characterization in the Tete region. Chemical and isotopic data suggest that the springs have a meteoric origin and do not show connection with any active magmatic system. The proposed circulation model suggests high depths infiltration of meteoric waters along faults and fractures in a system characterised by discrete permeability and reservoir temperature between 90 and 120 °C. These results, jointly with low salinity fluids and corrosive components absence suggest that the geothermal system may be conveniently exploited for direct and indirect uses.458 10