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Book Chapter

Post-emplacement thermo-rheological history of a granite intrusion and surrounding rocks: the Monte Capanne pluton, Elba Island, Italy

By
Alfredo Caggianelli
Alfredo Caggianelli
1
Dipartimento di Scienze della Terra e Geoambientali, Bari University, via Orabona 4, 70125 Bari, Italy
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;
Giorgio Ranalli
Giorgio Ranalli
2
Department of Earth Sciences, Carleton University, Ottawa K1S 5B6, Canada
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;
Alessio Lavecchia
Alessio Lavecchia
1
Dipartimento di Scienze della Terra e Geoambientali, Bari University, via Orabona 4, 70125 Bari, Italy
3
Department of Computational Geoscience, Simula Research Laboratory, 1364 Fornebu, Norway
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;
Domenico Liotta
Domenico Liotta
1
Dipartimento di Scienze della Terra e Geoambientali, Bari University, via Orabona 4, 70125 Bari, Italy
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;
Andrea Dini
Andrea Dini
4
Institute for Geosciences and Earth Resources, via Moruzzi 1, 56124 Pisa, Italy
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Published:
January 01, 2014

Abstract

A thermo-rheological model of the Monte Capanne pluton, Elba Island, Italy is proposed as having general relevance for the thermal and tectonic evolution of upper crustal granites and their surrounding rocks in extensional regions. The thermal evolution of the pluton and country rocks is followed for 1 myr after emplacement, which occurred at c. 6.9 Ma. The pluton completely crystallized in c. 210 kyr (±20%). The adjacent rocks reached a thermal peak of 550 °C (±10%), maintaining a temperature higher than 500 °C for c. 100 kyr.

The temperature distribution is used to construct a model for the time-dependent rheology of the pluton and surrounding rocks. A series of 2D cross-sections shows an upward migration of the regional brittle−ductile transition, and the formation of a ductile horizon above the pluton. The former is a combined effect of unroofing and middle crust heating; the latter is the result of temperature increase in rheologically weak country rocks. This ductile horizon has a potential role in the tectonic evolution of the region, since it could favour the formation of upper crustal shear zones and listric faults rooting in the transient brittle−ductile transition and playing a major role in further post-emplacement extension.

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Contents

Geological Society, London, Special Publications

Deformation Structures and Processes within the Continental Crust

S. Llana-Fúnez
S. Llana-Fúnez
Universidad de Oviedo, Spain
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A. Marcos
A. Marcos
Universidad de Oviedo, Spain
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F. Bastida
F. Bastida
Universidad de Oviedo, Spain
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Geological Society of London
Volume
394
ISBN electronic:
9781862396708
Publication date:
January 01, 2014

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