We modelled thermo-rheological perturbations, related to the emplacement of a magmatic body in the upper crust. This approach was considered relevant for the areas characterized by elevated surface heat flow and chiefly for the geothermal fields. The numerical conductive thermal model applied to the Larderello geothermal area in Tuscany, allowed to constrain size, depth and timing of emplacement of the pluton. We inferred that the emplacement of a magmatic body, at a minimum depth of 3km, having a horizontal extension of 14km and a maximum thickness of 8km, can reasonably reproduce the observed regional surface heat flow anomaly of the Larderello area, when 300 (100) kyr are elapsed from the magma emplacement. Even assuming an incremental growth, the first magma injection should not be older than 1 +/- 0.3Ma.Results of the thermal model were used to set up a rheological model and to simulate the drifting of the brittle-ductile transition during the cooling of the pluton. A comparison with the K-horizon profile, a prominent seismic reflector in the Larderello area, was then performed. It was found that the K-horizon approximately corresponds with the pluton roof and with the current location of the brittle-ductile transition.
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Univ Bari, Dipartimento Sci Terra & Geoambientali, Via Orabona 4, I-70125 Bari, ItalyUniv Bari, Dipartimento Sci Terra & Geoambientali, Via Orabona 4, I-70125 Bari, Italy
Caggianelli, Alfredo
Ranalli, Giorgio
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Carleton Univ, Dept Earth Sci, Ottawa K1S 5B6, ON, CanadaUniv Bari, Dipartimento Sci Terra & Geoambientali, Via Orabona 4, I-70125 Bari, Italy
Ranalli, Giorgio
Lavecchia, Alessio
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Univ Bari, Dipartimento Sci Terra & Geoambientali, Via Orabona 4, I-70125 Bari, Italy
Dept Computat Geosci, Simula Res Lab, N-1364 Fornebu, NorwayUniv Bari, Dipartimento Sci Terra & Geoambientali, Via Orabona 4, I-70125 Bari, Italy
Lavecchia, Alessio
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Liotta, Domenico
Dini, Andrea
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Inst Geosci & Earth Resources, I-56124 Pisa, ItalyUniv Bari, Dipartimento Sci Terra & Geoambientali, Via Orabona 4, I-70125 Bari, Italy
Dini, Andrea
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