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Rapid exhumation of young granites in an extensional domain: the example of the Giglio Island pluton (Tuscany)

Published online by Cambridge University Press:  03 August 2023

Chinedu Uduma Ibe*
Affiliation:
Department of Earth and Geo-environmental Sciences, University of Bari Aldo Moro, Bari, Italy
Antonio Langone
Affiliation:
Department of Earth and Environmental Sciences, University of Pavia, Pavia, Italy
Finlay M. Stuart
Affiliation:
Isotope Geosciences, Scottish Universities Environmental Research Centre, East Kilbride, UK
Andrea Brogi
Affiliation:
Department of Earth and Geo-environmental Sciences, University of Bari Aldo Moro, Bari, Italy CNR-IGG, Institute of Geosciences and Earth Resources, Pisa, Italy
Alfredo Caggianelli
Affiliation:
Department of Earth and Geo-environmental Sciences, University of Bari Aldo Moro, Bari, Italy
Domenico Liotta
Affiliation:
Department of Earth and Geo-environmental Sciences, University of Bari Aldo Moro, Bari, Italy CNR-IGG, Institute of Geosciences and Earth Resources, Pisa, Italy
Fabrizio Tursi
Affiliation:
Department of Earth Sciences, University of Turin, Torino, Italy
*
Corresponding author: Chinedu Uduma Ibe; Email: chinedu.ibe@uniba.it

Abstract

The presence of recently intruded granites at Earth’s surface suggests that their exhumation may have occurred rapidly. The Neogene granites of the Tuscan Magmatic Province (Italy) were emplaced during a period of extensional tectonics and are ideal for determining and quantifying the exhumation process. The peraluminous monzogranite of Giglio Island in the northern Tyrrhenian Sea is characterized by the presence of roof pendants, xenoliths and miarolitic cavities. The petrologic study of metamorphic xenoliths and new zircon U–Pb ages show that the granite was emplaced at 6.4–10 km depth at 5.7 ± 0.4 Ma. Exhumation, constrained by apatite (U–Th)/He ages, was essentially complete in 0.9 Myr at a minimum rate of 6 mm/year. This requires rapid tectonic unroofing, isostatic rebound and thermal softening activity, weakening the upper crust and favouring exhumation at a previously undocumented rate.

Type
Rapid Communication
Copyright
© The Author(s), 2023. Published by Cambridge University Press

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