Abstract
The Pontine archipelago consists of several volcanic islands and islets sited at the eastern end of the 41° Parallel line. Ages of exposed products range from about 4.1 Ma to less than 130 ka, and decrease eastward. Calcalkaline rhyolites, peralkaline rhyolites, and trachytes occur in the western islands of Ponza, La Botte, Palmarola and Zannone, where mafic-intermediate calcalkaline to potassic 4.0-3.9 Ma old volcanism has been recently discovered below sea level. A suite of basalt-trachybasalt to phonolite rocks makes up the eastern islands of Ventotene and Santo Stefano. Trachytes and peralkaline rhyolites derived from moderately potassic mafic parents by fractional crystallisation plus crustal assimilation. Calcalkaline rhyolites were formed either by crustal melting or by AFC, starting from mafic-intermediate calcalkaline parents. Basalts and trachybasalts from Ventotene have variable isotopic signatures, which reflect open-system intra-crustal evolution processes and/or source heterogeneity. The mafic rocks from Ventotene have geochemical and isotopic signatures that resemble the moderately potassic rocks from Ernici-Roccamonfina, suggesting similar type of mantle metasomatism and geodynamic significance. The Pontine volcanoes represent the northern termination of a Plio-Pleistocene volcanic alignment that extends from Anchise and the western Aeolian seamounts in the Southern Tyrrhenian Sea to offshore Central Italy. These represent remnant arcs that were constructed across the Tyrrhenian Sea during the eastward migration of the Ionian subduction system.
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Peccerillo, A. (2017). The Pontine Islands. In: Cenozoic Volcanism in the Tyrrhenian Sea Region. Advances in Volcanology. Springer, Cham. https://doi.org/10.1007/978-3-319-42491-0_6
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