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The whole series of sediments from Cambrian to Quaternary is present in Sardinia. Two main magmatic cycles. Hercynian and Alpine, and four orogeneses, Caledonian sardic phase, Caledonian proper, Hercynian and Alpine, are recognized.

Hercynian magmatism emplaced large masses of granites and played an outstanding minerogenetic role in Sardinia, but was not the only cause of ore deposition, as was thought by some previous authors.

Very important lead-zinc deposits, both stratiform and of vein-type, are known in Sardinia. Far less important are stratiform and vein-type barite deposits. Fluorite occurs only as veins.

According to the most recent, even if provisional, ideas, lead-zinc stratiform deposits may be classified in three categories, namely: A) Definitely or probably epigenetic; B) Syngenetic: C) Of complex genesis.

Category A includes: (1) ore deposits related and (2) unrelated to Hercynian intrusives.

Category Β includes: (1) Cambrian and (2) Gothlandian deposits.

Category C. has only one representative and. in this three different minerogenetic factors appear to have acted successively.

Evidences for this classification are: (11 large- and small-scale space relations; (2) a limited number of age determinations based on lead isotopes, and (3) sulfur isotope ratios.

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