Journal article

The Cenozoic igneous activity of Sardinia

Lustrino M, Morra V, Melluso L, Brotzu P, D'Amelio F, Fedele L, Franciosi L, Lonis R, Liebercknecht A ...see all

Periodico di Mineralogia, vol. 73, issue SPEC. ISSUE 1 (2004) pp. 105-134

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Abstract

During the Cenozoic, the island of Sardinia was the location of two different magmatic episodes: 1) a Oligocene to Miocene (hereafter OM) cycle approximately 32-15 Ma and 2) a Pliocene to Quaternary (hereafter PQ) cycle approximately 5-0.1 Ma). These two volcanic cycles differ in many aspects: 1) geographic occurrence the OM rocks occur almost exclusively in a graben structure called the Fossa Sarda (Sardinian Trough) that cuts the entire island from north to south, whereas the PQ rocks are scattered throughout the island; 2) petrography (the OM rocks are mostly porphyritic, whereas the PQ rocks are mostly aphyric); 3) geochemical affinity (the OM rocks are mostly subalkaline with a tholeiitic to calcalkaline character, whereas the PQ rocks are mostly sodic alkaline with fewer tholeiitic types); 4) major element compositions the OM rocks are mostly dacites to rhyolites with fewer basaltic andesites, andesites and rare basalts while the PQ rocks are mostly hawaiites, mugearites and basaltic andesites, with both SiO (sub 2) -oversaturated and SiO (sub 2) -undersaturated evolved types (rhyolites and phonolites); moreover, for a given SiO (sub 2) , OM rocks have higher CaO, lower TiO (sub 2) and lower Na (sub 2) O compared to the PQ rocks; 5) trace element abundance and ratios (the OM rocks have lower HFSE and REE contents and higher La/Nb and Zr/Nb ratios compared to the PQ samples); 6) Sr isotopic composition (the OM rocks have (super 87) Sr/ (super 86) Sr generally >0.7047, whereas the PQ rocks have (super 87) Sr/ (super 86) Sr generally

Author-supplied keywords

  • Alpine orogenesis
  • EMI
  • EMU
  • Geochemistry
  • Geodynamics
  • HIMU
  • Mediterranean Sea
  • Petrology
  • Sardinia

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  • PUI: 369164811
  • SGR: 33645409551
  • ISBN: 0369-8963
  • SCOPUS: 2-s2.0-33645409551
  • ISSN: 03698963

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