Different Localities of Potassium-Rich Silica-Undersaturated Igneous Rocks and Their Silica-Rich Variants - Origin of Potassium-rich Silica-deficient Igneous Rocks - page 160

(a)

Tuscan Province

Vulsini

Corsica

Rome
Ernici

Pletre Nere
Roccamonfina
Naples
Vesuvius

Campi Flegrei

300

Sardinia

Tyrrhenian Sea

Aeollan Islands

Ustica

Etna

Slcily

Iblei

(b)

4.4 0

Florence

Pisa

Siena

San
Vincenzo

M.Amiata

Radicofani
S.Venanzo

Rocca
Strada

Pescara

M.Cimini

M.VULSINI

Cupaello

Vico

4.2 0

Rome

M.Sabatini

Ernici

ALBAN
HILLS

Roccamonfina

Somma-
Vesuvius

Naples

Pontine Is.

Ischia

Phlegrean
Fields

4.0 0

0

0 0 2 0

2W

Fig. 4.20 a Location of different Italian volcanic complexes (solid triangles) known for K-rich-
SiO 2 undersaturated rocks (after Beccaluva et al. 1991). b Distribution of volcanic complexes at
San Venanzo,Vico, Cupaello, M-Amiata, Ernici, Phegrean Fields and other regions of central Italy