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Modelling the thermal perturbation of the continental crust after intraplating of thick granitoid sheets: a comparison with the crustal sections in Calabria (Italy)

A. CAGGIANELLI^*,* and G. PROSSER

^* Dipartimento Geomineralogico, Università di Bari, via Orabona 4, Bari 70125 Italy
Dipartimento di Scienze Geologiche, Università della Basilicata, Potenza 85100 Italy

^* Author for correspondence: caggianelli{at}geomin.uniba.it

Thick granitoid sheets represent a considerable percentage of Palaeozoic crustal sections exposed in Calabria. High thermal gradients are recorded in upper and lower crustal regional metamorphic rocks lying at the roof and base of the granitoids. Ages of peak metamorphism and emplacement of granitoids are mostly overlapping, suggesting a connection between magma intrusion and low-pressure metamorphism. To analyse this relationship, thermal perturbation following granitoid emplacement has been modelled. The simulation indicates that, in the upper crust, the thermal perturbation is short-lived. In contrast, in the lower crust temperatures greater than 700 °C are maintained for 12 Ma, explaining granulite formation, anatexis and the following nearly isobaric cooling. An even longer perturbation can be achieved introducing the effect of mantle lithosphere thinning into the model.

Key Words: Hercynian Orogeny • continental crust • thermal metamorphism • numerical models • Calabria Italy

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