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The occurrence of metavolcanic rocks within the Paleozoic basement of theAlpi Apuane metamorphic complex has been known since long time. Among them,some massive porphyritic tourmaline-bearing rocks cropping out in the southernsector of the Alpi Apuane present some distinctive and peculiar features,differing from the better known middle Ordovician metarhyolites of thePorfiroidi e scisti porfirici Fm. The porphyritic tourmaline-bearing rocksbelong to the recently proposed Fornovolasco Metarhyolite Fm. They are granularto porphyritic, with phenocrysts of quartz (often with magmatic embayment),pseudomorphosed feldspars, and mica (both biotite and muscovite), in agroundmass formed by quartz, white mica, albite, and Kfeldspar. Tourmaline(schorl-dravite in composition) is an abundant accessory mineral, in some casesforming cm-sized spots. The studied rocks plot into the rhyolite field of theTotal Alkali vs Silica classification diagram. They show a peraluminous nature,having an Alumina Saturation Index ranging from 1.3 and 3.2. Theirtrace-element signature is that typical of highly evolved orogenic magmas.Laser ablationICPMS UPb datings on zircon suggest a Permian crystallization age(weighted average ages of the four samples ranging from 292 and 271 Ma), thusrelating these rocks to a post-Variscan magmatism. This new dating representsthe very first evidence of a Permian magmatism in the pre-Triassic basement ofthe Northern Apennines. The potential relationships between Permian felsicmagmatism and the ore genesis in the Alpi Apuane metamorphic complex are alsodiscussed.

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Evidence of Permian magmatism in the Alpi Apuane metamorphic complex  (Northern Apennines, Italy): New hints for the geological evolution of the  basement of the Adria plate