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Geochronological study of zircons from continental crust rocks in the Frido Unit (southern Apennines)

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Abstract

Zircon crystals have been separated from gneisses and metagranitoids of the Pollino area (southern Apennines) in order to unravel the origin of these crustal slices within the ophiolite-bearing Frido Unit. The morphology of the zircon has been investigated by SEM, and the internal structure was revealed by cathodoluminescence. Data obtained by U/Pb dating have been used to deduce the age and significance of the different crystallization stages of zircon, connected to the evolutionary stages of the continental crust (Late Paleozoic–Early Mesozoic). Zircons in gneisses are characterized by inherited cores of magmatic origin, bordered by metamorphic rims. Inherited zircons generally show Paleoproterozoic to Ordovician ages, indicating the provenance of the sedimentary protolith from different sources. The exclusive presence of Late Neoproterozoic zircon cores in leucocratic gneisses may suggest a different magmatic source possibly connected to Pan-African events. Late Carboniferous–Early Permian ages are found mainly in zircon rims of metamorphic origin. These are similar to the emplacement ages of protolith of the metagranites in the middle crust portion. Late Carboniferous–Early Permian metamorphism and magmatism testify the extensional collapse of the Hercynian belt, recorded in European, particularly, in the Corsica–Sardinia block and in Calabria. Late Permian–Triassic ages have been detected in zircon rims from gneisses and metagranitoids. These younger ages appear related to deformation and emplacement of albite–quartz veins in both lithologies, and are related to an extensional episode predating the Middle Triassic to Middle Jurassic rifting in the Tethyan domain, followed by Middle to Late Jurassic spreading.

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Acknowledgments

The authors benefited from finance support by University of Basilicata research funds. Careful reviews by Michele Marroni and by anonymous referee are kindly acknowledged.

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  1. Department of Sciences, University of Basilicata, Viale dell’Ateneo Lucano 10, 85100, Potenza, Italy

    Salvatore Laurita, Giacomo Prosser, Giovanna Rizzo & Alessandro Laurita

  2. CNR-IGG, UOS di Pavia, Pavia, Italy

    Antonio Langone & Massimo Tiepolo

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  1. Salvatore Laurita
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Laurita, S., Prosser, G., Rizzo, G. et al. Geochronological study of zircons from continental crust rocks in the Frido Unit (southern Apennines). Int J Earth Sci (Geol Rundsch) 104, 179–203 (2015). https://doi.org/10.1007/s00531-014-1077-7

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