Regional Distribution of Magma Types

Therefore, their composition gives the maximum information on the composition of mantle sources beneath the Italian region. 

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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Peccerillo A, Turco E (2004) Petrological and geochemical variations of Plio-Quatemary volcanism in the Tyrrhenian Sea area regional distribution of magma types, petrogenesis and geodynamic implications. Per Mineral 73 231-251... 

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