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Alpine tectonothermal evolution of the Tuscan metamorphic complex in the Larderello geothermal field (Northern Apennines, Italy)

Giovanni Musumeci, Luca Bocini and Renzo Corsi
Alpine tectonothermal evolution of the Tuscan metamorphic complex in the Larderello geothermal field (Northern Apennines, Italy)
Journal of the Geological Society of London (July 2002) 159, Part 4: 443-456

Abstract

On the internal (Tyrrhenian) side of the northern Apennines, high heat flow and geothermal gradient in the Larderello geothermal field are evidence of a large-scale thermal anomaly, related to the emplacement of a large batholith of Pliocene age extending from the upper to middle crust. These intrusions relate to the Miocene to Recent northern Apennines magmatism, which developed as a result of crustal extension and upwelling of the asthenosphere at the base of the thinned crust. In the subsurface of the Larderello geothermal field, medium- and high-grade metamorphic rocks (Tuscan Metamorphic Complex) cored in several geothermal wells, have previously been considered to be Variscan basement. New structural and petrographic data on these metamorphic rocks indicate an Alpine tectonometamorphic history and provide evidence that medium- to high-grade mineral assemblages are related to Pliocene thermal metamorphism centred on intrusions at shallow depth. These data allow a new interpretation of the Tuscan Metamorphic Complex as a tectonic wedge of the Late Palaeozoic-Triassic units, and in particular highlight the considerable extent of Pliocene thermal metamorphism and hydrothermal circulation as a result of convective cooling of intrusions.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 159, Part 4
Title: Alpine tectonothermal evolution of the Tuscan metamorphic complex in the Larderello geothermal field (Northern Apennines, Italy)
Affiliation: Universita di Pisa, Dipartimento di Scienze della Terra, Pisa, Italy
Pages: 443-456
Published: 200207
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 33
Accession Number: 2002-054639
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., 4 tables, sketch maps
N42°00'00" - N45°00'00", E10°00'00" - E12°00'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200218
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