Apennine Pyroclastic Deposits

The geochemical composition of the volcanics at most localities in the internal zones of Abruzzi and Lazio is characterised by strongly fractionated REE patterns, with significant negative Eu anomalies. Incompatible element patterns are fractionated and contain negative spikes of Ba and 

HFSE (Bosi and Locardi 1992). These characteristics are common to both the IAP and Roman Province, and do not allow the exclusion of a provenance from Roman volcanoes for the most fine-grained deposits. 

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Ultrapotassic rocks from Tuscany have a lamproitic composition (see Appendix for nomenclature of potassic rocks). Older lamproites (14 Ma) occur at Sisco, Corsica. Kamafugitic rocks make up a few monogenetic centres in the internal zones of northern-central Apennines (Umbria, Latium, Abruzzi), and have been found at Vulsini and as ejected blocks in pyroclastic deposits at Colli Albani (Federico et al. 1994). Roman-type potassic and ultrapotassic rocks (KS and HKS) form the bulk of magma-... 

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