Crustal models of the geothermal areas of southern Tuscany (Italy)

Gianelli, Giovanni; Manzella, Adele; Puxeddu, Mariano

doi:10.1016/s0040-1951(97)00101-7

Cited by 96 publications

(63 citation statements)

References 43 publications

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“…However, the strength of the refection signal varies considerably along the profiles with local ambiguities and offsets (Riedel et al 2015). Similar phenomena have been observed in other seismic profiles which resolve the K horizon where "multiple reflections and complex appearance due to interconnecting reflections, refractions, and diffraction" have been reported (Gianelli et al 1997). …”

Section: K Horizonsupporting

confidence: 71%

“…They are non-uniformly distributed and emplaced at various depths, leading to rather large differences in surface heat flow (100-1000 mW/ m 2 ; Bellani et al 2004) in this inner Northern Apennine area. A correlation between the depth of this heat source and a high-amplitude seismic reflector (called K horizon) has been described, among others, by Bellani et al (2004), Cameli et al (1993Cameli et al ( , 1998, Gianelli et al (1997), Liotta and Ranalli (1999), and Vanorio et al (2004). As stated by Liotta and Ranalli (1999), "this horizon ranges in depth between 3 and 12 km, and can be followed almost continuously from the Tyrrhenian coast to the central part of the Apennines'".…”

Section: Crustal Heat Sourcementioning

confidence: 82%

“…Young (Pliocene to Quaternary) granite plutons have been identified as the primary heat source in the southern Tuscan geothermal areas including Larderello-Travale and Monte Amiata (Brogi 2008b;Frondini et al 2009;Gianelli et al 1997Gianelli et al , 1988. These acidic intrusive bodies belong to the Tuscan Magmatic Province (Innocenti et al 1992) and can be linked to the extensional tectonic setting in the region (Brogi 2008b).…”

Section: Crustal Heat Sourcementioning

confidence: 99%

“…As stated by Liotta and Ranalli (1999), "this horizon ranges in depth between 3 and 12 km, and can be followed almost continuously from the Tyrrhenian coast to the central part of the Apennines'". The shallowest areas are in the Larderello-Travale and Monte Amiata geothermal areas (Cameli et al 1993;Gianelli et al 1997).…”

Section: Crustal Heat Sourcementioning

confidence: 99%

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Influence of depth, temperature, and structure of a crustal heat source on the geothermal reservoirs of Tuscany: numerical modelling and sensitivity study

et al. 2016

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© 2016, Ebigbo et al.Granitoid intrusions are the primary heat source of many deep geothermal reservoirs in Tuscany. The depth and shape of these plutons, characterised in this study by a prominent seismic reflector (the K horizon), may vary significantly within the spatial scale of interest. In an exploration field, simulations reveal the mechanisms by which such a heat source influences temperature distribution. A simple analysis quantifies the sensitivity of potentially measurable indicators (i.e. vertical temperature profiles and surface heat flow) to variations in depth, temperature, and shape of the heat source within given ranges of uncertainty

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Section: K Horizonsupporting

confidence: 71%

Section: Crustal Heat Sourcementioning

confidence: 82%

Section: Crustal Heat Sourcementioning

confidence: 99%

Section: Crustal Heat Sourcementioning

confidence: 99%

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Influence of depth, temperature, and structure of a crustal heat source on the geothermal reservoirs of Tuscany: numerical modelling and sensitivity study

et al. 2016

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“…Li, Livorno; Si, Siena; Gr, Grosseto. Extent of buried intrusions after Boccaletti et al [1997] and Gianelli et al [1997]. (b) Schematic section summarizing the tectonic unit stack and relationships in southern Tuscany.…”

Section: Geological Outline Of the Northern Apennine Chain In Southermentioning

confidence: 99%

Magma emplacement in a thrust ramp anticline: The Gavorrano Granite (northern Apennines, Italy)

et al. 2005

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[1] Magma emplacement in the upper crust is often associated with crustal extension, whereby space for intrusions is made by dilation along transtensive and strike-slip faults. The lenticular shape of several intrusions indicates that a further mechanism for magma intrusion is laccolith emplacement with roof uplift of the overburden. Additionally, melts exploit rheological discontinuities (e.g., sedimentary layering) during their ascent. We present an emplacement model for intrusion of the shallow level Gavorrano Granite (northern Apennine, Italy), which is located at the core of an open anticline. The shape of the intrusion and structural features of the host rocks are indicative of a synkinematic emplacement in a growing thrust anticline. Space was provided by the opening of dilatation zones at the core of anticline as a consequence of different amounts of translation between hanging wall and footwall units which were separated by evaporitic rocks. These evaporitic units acted as major décollement layers. Analog models provide results in good agreement with the structural setting of the anticline and emphasize the possibility that melts filled the dilatation zone, with the décollement layers further facilitating intrusion.

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UPb and ⁴⁰Ar³⁹Ar geochronology of Palaeozoic units in the northern Apennines: determining protolith age and alpine evolution using the Calamita Schist and Ortano Porphyroid

et al. 2010

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In the northern Apennines, the Palaeozoic basement involved in the Late Oligocene-Middle Miocene nappe stack contains metamorphic units for which hypothetical ages have been assigned on the basis of lithological correlations with the Palaeozoic formations of the Variscan chain in Sardinia. This uncertainty concerning the age poses limitations to reconstructing the Palaeozoic stratigraphy, defining the Alpine and preAlpine histories and correlations with other domains of the Variscan chain. We present the UÀPb age of detrital zircon and the 40 ArÀ 39 Ar age of metamorphic muscovite for the Calamita Schist and Ortano Porphyroid, two metamorphic units of undetermined Palaeozoic age cropping out in the eastern Elba Island. The radioisotopic data allows us to: (i) define the Early Carboniferous and Middle Ordovician ages for the Calamita Schist and Ortano Porphyroid, respectively, as well as their derivation (flysch deposit and magmatic rocks); (ii) pose some constraints concerning their alpine tectonic and metamorphic histories. These new data generate a more precise reconstruction of the Palaeozoic sequence in the northern Apennines, and they document that the Palaeozoic basement involved in the alpine deformation underwent internal stacking with an inversion of the original sequence.

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Crustal models of the geothermal areas of southern Tuscany (Italy)

Cited by 96 publications

References 43 publications

Influence of depth, temperature, and structure of a crustal heat source on the geothermal reservoirs of Tuscany: numerical modelling and sensitivity study

Influence of depth, temperature, and structure of a crustal heat source on the geothermal reservoirs of Tuscany: numerical modelling and sensitivity study

Magma emplacement in a thrust ramp anticline: The Gavorrano Granite (northern Apennines, Italy)

UPb and ⁴⁰Ar³⁹Ar geochronology of Palaeozoic units in the northern Apennines: determining protolith age and alpine evolution using the Calamita Schist and Ortano Porphyroid

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Crustal models of the geothermal areas of southern Tuscany (Italy)

Cited by 96 publications

References 43 publications

Influence of depth, temperature, and structure of a crustal heat source on the geothermal reservoirs of Tuscany: numerical modelling and sensitivity study

Influence of depth, temperature, and structure of a crustal heat source on the geothermal reservoirs of Tuscany: numerical modelling and sensitivity study

Magma emplacement in a thrust ramp anticline: The Gavorrano Granite (northern Apennines, Italy)

UPb and 40Ar39Ar geochronology of Palaeozoic units in the northern Apennines: determining protolith age and alpine evolution using the Calamita Schist and Ortano Porphyroid

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Resources

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UPb and ⁴⁰Ar³⁹Ar geochronology of Palaeozoic units in the northern Apennines: determining protolith age and alpine evolution using the Calamita Schist and Ortano Porphyroid