Compositional variations of Plio-Quaternary volcanism in Italy : Deep vs . shallow mantle processes

Major and incompatible trace element abundances and ratios show variable values, which allow several compositionally distinct magmatic provinces to be distinguished. These are separated by deep faults and are characterised by distinct lithospheric mechanical characteristics, e.g., Moho depth and lid thickness. Radiogenic isotope compositions (Sr, Nd, Pb) of mafi c rocks show continuous variations connecting three distinct mantle reservoirs: HIMU-FOZO, EM2 and a high-87Sr/86Sr low-206Pb/204Pb mantle reservoir. The latter is typical of the Italian region and is called ITEM (Italian Enriched Mantle).

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