Procida and Vivara

The most mafic lithologies are encountered among lithic ejecta (Fig. 6.16). 

Major elements show a vertical trend for potassium in the mafic rocks (Fig. 6.16c). These have moderate enrichments in incompatible elements, which are lower than in other Campanian volcanoes ferromagnesian trace element contents are high in the mafic rocks (Ni up to 230 ppm, Cr up to 600 ppm). REE are fractionated, with small or no Eu anomalies (Fig. 6.17a). Incompatible element patterns of mafic rocks are fractionated and contain small negative anomalies of HFSE and positive spikes of Pb (Fig. 6.17b). Sr and Nd isotopic ratios respectively display lower and higher 

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Fig. 6.14. Sketch map of Ischia, Procida and Vivara islands. Simplified after Gil-lot etal. (1982).

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