Geotectonic settings of miocene-quaternary volcanism in and around the eastern Tyrrhenian sea border (Italy) as deduced from major element geochemistry |
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| Authors: | P Di Girolamo |
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| Institution: | 1. Istituto di Mineralogia, Università di Napoli, Via Mezzocannone 8, 80134, Napoli, Italy
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| Abstract: | The volcanic rocks along the south-eastern and eastern Tyrrhenian border of Italy have been classified as converging plate margin magma types by using discriminant functions based on major element patterns. These rocks belong to calc-alkaline and shoshonitic associations (shoshonites, and predominant leucitic rocks) ranging in age from Upper Miocene to, mostly, Quaternary. According to the same method of classification, the remaining Italian volcanic rocks — alkali-sodic and subordinate tholeiitic basalts — around the Tyrrhenian border are found to be rocks of the tensional type of Mesozoic to prevailingly Quaternary age. The volcanic materials of the 650 km long SE and E Tyrrhenian border can be related to the convergence of the African-Adriatic and Tyrrhenian plates. |
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