Zircon megacrysts from basalts of the Venetian Volcanic Province (NE Italy): U-Pb ages, oxygen isotopes and REE data (Articolo in rivista)

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  • Zircon megacrysts from basalts of the Venetian Volcanic Province (NE Italy): U-Pb ages, oxygen isotopes and REE data (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.lithos.2006.06.007 (literal)
Alternative label
  • Visona D; Caironi V; Carraro A; Dallai L; Fioretti AM; Fanning M (2007)
    Zircon megacrysts from basalts of the Venetian Volcanic Province (NE Italy): U-Pb ages, oxygen isotopes and REE data
    in Lithos (Oslo. Print); Elsevier B.V., Amsterdam (Belgio)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Visona D; Caironi V; Carraro A; Dallai L; Fioretti AM; Fanning M (literal)
Pagina inizio
  • 168 (literal)
Pagina fine
  • 180 (literal)
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  • 94 (literal)
Rivista
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  • 12 (literal)
Note
  • S (literal)
  • Google Scholar (literal)
  • ISI Web of Science (WOS) (literal)
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  • a Dipartimento di Mineralogia e Petrologia, Università di Padova, Corso Garibaldi 37, 35137 Padova, Italy b Dipartimento di Scienze della Terra, Università di Milano, Via Botticelli 23, 20133 Milano, Italy c CNR, Istituto di Geoscienze e Georisorse, Via Moruzzi 1, 56127 Pisa, Italy d CNR, Istituto di Geoscienze e Georisorse, Corso Garibaldi 37, 35137 Padova, Italy e Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia (literal)
Titolo
  • Zircon megacrysts from basalts of the Venetian Volcanic Province (NE Italy): U-Pb ages, oxygen isotopes and REE data (literal)
Abstract
  • Mafic alkaline lavas from the Venetian Volcanic Province (NE Italy) contain orange-brown zircon megacrysts up to 15 mm long, subhedral to subrounded and showing equant morphology, with width-to-length ratios of 1:2-1:2.5. U-Pb ages of zircon (51.1 +/- 1.5 to 30.5 +/- 0.51 Ma) fit the stratigraphic age of the host lava (Middle Eocene and Oligocene) and their oxygen isotope composition (delta O-18 =5.31-5.51 parts per thousand) is similar to that of zircon formed in the upper mantle. Cathodoluminescence images and crystal chemical features, e.g. depletion of incompatible elements such as REE, Y, U and Th at constant Hf content, indicate that centre-to-edge zircon zoning is not consistent with evolution of the melt by fractional crystallization. All the above features, together with the fact that zircon and host basalts are coeval, indicate that the studied Zr megacrysts crystallised from a primitive alkaline mafic magma, which later evolved to the less alkaline host magma. (literal)
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