Deciphering the geologic memory of a Permian conglomerate of the Southern Alps by pebble P-T estimates (Articolo in rivista)

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  • Deciphering the geologic memory of a Permian conglomerate of the Southern Alps by pebble P-T estimates (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1007/s00531-007-0241-8 (literal)
Alternative label
  • Spalla M.I., Zanoni D., Gosso G., Zucali M. (2007)
    Deciphering the geologic memory of a Permian conglomerate of the Southern Alps by pebble P-T estimates
    in International journal of earth sciences (1999, Print); SPRINGER-VERLAG, WIEN (Austria)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Spalla M.I., Zanoni D., Gosso G., Zucali M. (literal)
Pagina inizio
  • 203 (literal)
Pagina fine
  • 226 (literal)
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  • 98 (literal)
Rivista
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  • DOI 10.1007/s00531-007-0241-8. (literal)
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  • 23 (literal)
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  • 2009 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Dipartimento di Scienze della Terra \"Ardito Desio\" Università degli Studi di Milano e CNR-IDPA (literal)
Titolo
  • Deciphering the geologic memory of a Permian conglomerate of the Southern Alps by pebble P-T estimates (literal)
Abstract
  • The volcano–clastic sequence of Trompia Valley, which caps the Tre Valli Bresciane Variscan basement (TVB), comprises the Dosso dei Galli Conglomerate (DGC), the oldest deposit containing up to metre-sized metamorphic pebbles. This Lower Permian formation of the Trompia Basin was fed by the erosion products of the Variscan chain. We used microstructural and mineral chemical data on metamorphic pebbles of the DGC to infer a quantitative tectono-thermal evolution of the eroded pre-Permian basement and to compare them with those of TVB and the surrounding Southalpine basement units (tectonometamorphic units = TMUs). Metapelitic and metaintrusive pebbles record a polyphase metamorphism with two metamorphic re-equilibrations: the first under epidote amphibolite facies (M1, Tmax_PTmax ) and the second under greenschist facies (M2) conditions. Rock types and metamorphic data largely match those of TVB basement unit. The structural and metamorphic records in the pebbles are pre-Permian, and the conglomerate matrix is non-metamorphic. The DGC deposition age (283 ± 1–280.5 ± 2 Ma) constrains the minimal exhumation age of its basement source. The lack of staurolite bearing assemblages in metamorphic pebbles suggests that the DGC basement source was already exhumed to shallow structural levels (greenschist facies conditions) before the thermal equilibration consequent upon continental crust thickening induced by the Variscan collision. (literal)
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