Chicco J

Costa M

Invernizzi C

Pierantoni P P

English

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29 November 2022POLITECNICO DI TORINORepository ISTITUZIONALEQuaternary tectonics from seismic interpretation and its potential relation with deep geothermal fluids in the Marche(Central Italy) / Chicco, J; Invernizzi, C; Pierantoni, P P; Costa, M. - In: GEOPHYSICAL RESEARCH ABSTRACTS. -ISSN 1607-7962. - ELETTRONICO. - (2017). ((Intervento presentato al convegno European Geosciences Union (EGU),General Assembly 2020.OriginalQuaternary tectonics from seismic interpretation and its potential relation with deep geothermal fluids inthe Marche (Central Italy)Publisher:PublishedDOI:Terms of use:openAccessPublisher copyright(Article begins on next page)This article is made available under terms and conditions as specified in the  corresponding bibliographic description inthe repositoryAvailability:This version is available at: 11583/2915446 since: 2021-07-27T21:35:15ZCopernicusGeophysical Research AbstractsVol. 19, EGU2017-9268, 2017EGU General Assembly 2017© Author(s) 2017. CC Attribution 3.0 License.Quaternary tectonics from seismic interpretation and its potential relationwith deep geothermal fluids in the Marche (Central Italy).Jessica Chicco (1), Chiara Invernizzi (1), Pietro Paolo Pierantoni (1), and Mario Costa (2)(1) University of Camerino, School of Science and Technology, Geology, Camerino, Italy (jessica.chicco@unicam.it), (2) viaSelvelli,6 61032 Fano (Italy)Knowledge of the structural features is fundamental in evaluating geothermal exchange potential and in modellinggeothermal systems. In particular, faults and fractures play an important role for the circulation of fluids in thecrust, and structural setting can influence groundwater flow, its regime, chemistry and electrical conductivity.In this context, data coming from accurate studies of groundwater physical properties in the Marche region(Central Italy), concerning electrical conductivity above all, revealed some anomalies in several localities thatcould be ascribed to a strong structural control. Data acquisition and interpretation of some SW-NE seismicreflection profiles crossing the Apennine chain to the Adriatic sea and kindly provided by ENI S.p.A, highlightimportant deep Plio-Quaternary structures connected with minor surface ones and to hydrogeological conditions.Seismic profiles interpretation allowed to reconstruct the structural setting and to identify the recent evolutionof the Apennine Marche sector in more detail with respect to what is already known. In fact, some high anglestructures affecting the whole sedimentary sequence and routing at high depth were labelled. These are NW-SEsub-parallel transpressive structures bounded by SW and NE-dipping high-angle reverse faults reaching > 10 kmdepth (positive flower structures), and probably involving the upper crust basement. Three main alignments wereidentified from W to the coast line. In some cases, flower nucleation gives rise to the lifting and counter-clockwiserotation of the Pre-Pliocene substratum blocks, with the upwelling and outcropping of Upper Miocene (Messinian)evaporite deposits along the axial zone of the transpressive structural highs. Noting the analyses of groundwaterproperties coming from wells placed in proximity of these structures or located along the analysed seismicprofiles, anomalies in electrical conductivity are relevant. The activity of the deep rooting structures observed inthe seismic profiles and the high degree of fracturing that accompanies these complex and recent fault systemscan facilitate the exchange between deep and superficial fluids. In other cases, like in coastal structural high, itcan have a role in preventing the sea water ingression. This significant consideration can be supported also by thedirect relation of electrical conductivity with the amount of rainfall revealed from studied piezometers along thecarbonate Marche ridge. It should be explained through a specific behaviour (typical of carbonate aquifers, knownas the “piston-flow phase”) which implies an increase of groundwater mineralization as a result of transmission ofthe hydraulic pressure from the saturated zone, through fractures as important way for fluids circulation.Ultimately, we suggest that the structural control could be an important factor in influencing both the surface andthe groundwater flow behaviours, and then convective component of the heat transport in the studied area.brought to you by COREView metadata, citation and similar papers at core.ac.ukprovided by Institutional Research Information System University of Turin

Quaternary tectonics from seismic interpretation and its potential relation with deep geothermal fluids in the Marche (Central Italy)

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Quaternary tectonics from seismic interpretation and its potential relation with deep geothermal fluids in the Marche (Central Italy)

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