Campania Province

The Campania Province, Pontine Islands and Mount Vulture... 

Fig. 6.2. K20/Na20 vs. AQ diagram for the volcanic rocks from Campania Province, Pontine Islands and Mount Vulture. For definition of AQ, see Chap. 1.

The volcanic centers of the Campania Province developed inside Quaternary extensional basins along the Tyrrhenian Sea border at the intersection between NE-SW and NW-SE fault systems. The Pontine Islands form a row of volcanoes with a W-E trend, offshore the Campania Province, and along the so-called 41st Parallel Tectonic Line (Serri 1990 Bruno et al. 2000). Vulture is located at the eastern border of the Apennine compression front, in an extensional tectonic setting affecting the border of the Apulia foreland. 

The thickness of the lithosphere along the Pontine-Campania-Vulture transect increases from about 50 km along the Tyrrhenian Sea border to more than 110 km in the Apulia foreland (Calcagnile and Panza 1981). The depth of the Moho increases from about 20-25 km offshore the Tyrrhenian Sea coast to 40 km beneath the internal zones of the Apennines, to decrease to about 30 km beneath the Apulia foreland (e.g. Locardi and Nicolich 1988 Piromallo and Morelli 2003). In contrast with other zones of the Apennine chain, the sector running from the Campania Province to... 

The volcanoes in the Campania Province, Pontine Islands and Vulture are composed of a wide variety of magma types. Silica undersaturated ultrapo-tassic volcanism is restricted to Somma-Vesuvio, whereas mildly undersaturated to oversaturated potassic rocks occur at Campi Flegrei, Ischia, Procida and Ventotene. In the latter two islands, low potassium compositions close to calc-alkaline basalts are found among lavas and lithic ejecta. Pliocene calc-alkaline rocks are found as rhyolites at Ponza and as basalts and basaltic andesites beneath the Campanian Plain. At Vulture, volcanism is highly enriched in both Na and K, a composition that is distinct from any other volcano in the Italian peninsula. 

Table 6.2. Selected compositions for rocks from the Campania Province, Pontine Islands and Mount Vulture. Numbers in parentheses refer to compositions determined on distinct, though compositionally similar samples from the same locality as those analysed for the other elements. Source of data 1) Albini et al. (1980) 2) Metrich (1985) 3) De Fino et al. (1986) 4) Joron et al. (1987) 5) Poli et al. (1987) 6) Vezzoli (1988a) 7) Civetta et al. (1991c) 8) Belkin et al. (1993) 9) D Antonio et al. (1996) 10) Ayuso et al. (1998) 11) D Antonio et al. (1999a) 12) D Antonio et al. (1999b) 13) Conte and Dolfi (2002) 14) Pappalardo et al. (2002) 15) Cadoux et al. (2005) 16) De Astis et al. (2005).

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