U-Pb zircon ages for post-Variscan volcanism in the Ligurian Alps (Northern Italy) (Articolo in rivista)

Type
Label
  • U-Pb zircon ages for post-Variscan volcanism in the Ligurian Alps (Northern Italy) (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1144/0016-76492008-027 (literal)
Alternative label
  • Dallagiovanna G.; Gaggero L.; Maino M.; Seno S.; Tiepolo M. (2009)
    U-Pb zircon ages for post-Variscan volcanism in the Ligurian Alps (Northern Italy)
    in Journal of the Geological Society (Lond.); Geological society, London (Regno Unito)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Dallagiovanna G.; Gaggero L.; Maino M.; Seno S.; Tiepolo M. (literal)
Pagina inizio
  • 101 (literal)
Pagina fine
  • 114 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 166 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Department of Earth Sciences, University of Pavia, Via Ferrata 1, 27100 Pavia, Italy Department for the Study of the Territory and its Resources, University of Genoa, Corso Europa 26, 16132 Genova, Italy Institute of Geosciences and Georesources, CNR Pavia, Via Ferrata 1, 27100 Pavia, Italy (literal)
Titolo
  • U-Pb zircon ages for post-Variscan volcanism in the Ligurian Alps (Northern Italy) (literal)
Abstract
  • Ages of Permian volcanic rocks front the Ligurian Brianconnais domain (Western Italian Alps) have been determined by laser ablation inductively Coupled plasma mass spectrometry U-Pb dating of zircon. Three major volcanic units yielded zircons that were dated: calc-alkaline rhyolites (285.6 +/- 2.6 Ma), andesites (with inherited cores yielded ages c. 476 Ma and older) and voluminous rhyodacites-rhyolites (272.7 +/- 2.2 Ma). Following all amagmatic, sediment-starved time gap of c. 14 Ma, alkaline volcanic activity is recorded, at the top of the sequence, by K-alkaline rhyolites dated at 258.5 +/- 2.8 Ma. The Ligurian segment of the Southern Variscan belt records transtensional and then extensional tectonics associated with the volcanic activity The switch from calc-alkaline to alkaline activity corresponds to the transition from a post-orogenic to all anorogenic setting in the Southern Variscides: it may represent progressive and increasing delamination of the continental lithosphere, accompanied by partial inching of the lithospheric mantle. (literal)
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