Capo Ferrato

Sardinia (5.3 to 0.1) Capo Ferrato (—5), Montiferro (4-2), Orosei-Dorgali (4-2), Monte Ar-ci (3.7-2.3), Logudoro (3-0.1) - Stratovolcanoes, basaltic plateaux and monogenetic centres composed of subalkaline and Na-alkaline rocks, sometimes with a K-affinity. 

The alkaline mafic volcanics are less enriched in silica and more enriched in incompatible trace elements than oversaturated tholeiitic rocks with similar MgO contents. REE show smooth and fractionated patterns (Fig. 9.7). Mantle normalised incompatible element patterns of mafic rocks generally display a small upward convexity with moderate enrichments in Ta and Nb. The large majority of the mafic volcanic rocks exhibit positive spikes of Ba and Pb, which are small or absent in the southern outcrops of Capo Ferrato, Guspini and Rio Girone (Fig. 9.7). Silicic volcanics exhibit a large range of incompatible element concentrations. Sr- and Nd-isotopic... 

Volcanic centre Monte Arci Capo Ferrato Rio Girone Logudoro Montiferro Orosei-Dorgali ... 

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