Magmatism and fenitization in the Cretaceous potassium-alkaline-carbonatitic complex of Ipanema So Paulo State, Brazil (Articolo in rivista)

Type
Label
  • Magmatism and fenitization in the Cretaceous potassium-alkaline-carbonatitic complex of Ipanema So Paulo State, Brazil (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1007/s00710-011-0168-4 (literal)
Alternative label
  • Guarino, Vincenza; Azzone, Rogerio Guitarrari; Brotzu, Pietro; Gomes, Celso de Barros; Melluso, Leone; Morbidelli, Lucio; Ruberti, Excelso; Gaeta Tassinari, Colombo Celso; Brilli, Mauro (2012)
    Magmatism and fenitization in the Cretaceous potassium-alkaline-carbonatitic complex of Ipanema So Paulo State, Brazil
    in Mineralogy and petrology
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Guarino, Vincenza; Azzone, Rogerio Guitarrari; Brotzu, Pietro; Gomes, Celso de Barros; Melluso, Leone; Morbidelli, Lucio; Ruberti, Excelso; Gaeta Tassinari, Colombo Celso; Brilli, Mauro (literal)
Pagina inizio
  • 43 (literal)
Pagina fine
  • 61 (literal)
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  • 104 (literal)
Rivista
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  • 19 (literal)
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  • 1-2 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • University of Naples Federico II; Universidade de Sao Paulo; Sapienza University Rome; Consiglio Nazionale delle Ricerche (CNR) (literal)
Titolo
  • Magmatism and fenitization in the Cretaceous potassium-alkaline-carbonatitic complex of Ipanema So Paulo State, Brazil (literal)
Abstract
  • The Ipanema alkaline-carbonatitic complex is part of the Meso-Cenozoic alkaline magmatism located within the southeastern part of the Brazilian Platform. Drill-core and field sampling have indicated the occurrence of glimmerites, with subordinate shonkinites (mela-syenites), clinopyroxene-bearing glimmerites, diorites and syenites. The glimmerites are cross-cut by lamprophyric dykes and calciocarbonatites. Fenitization has deeply affected the country rocks, originating dioritic and syenitic rocks. The Ipanema rocks show a distinct potassic affinity. The initial Sr-Nd- isotopic composition of the Ipanema rocks (Sr-87/Sr-86 = 0.70661-0.70754 and Nd-143/Nd-144 = 0.51169-0.51181) is similar to that of tholeiitic and potassium-rich-alkaline rocks of the Eastern Paraguay. Stable isotope data for the Ipanema calciocarbonatite suggest interaction with fluids at temperatures typical of hydrothermal stages, as hypothesized for other carbonatite complexes from southeastern Brazil. The chemical differences between the lamprophyre, glimmerites, carbonatites, apatitites and magnetitites, and the absence of marked REE enrichment in the evolved lithologies, all indicate that fractional crystallization and accumulus of liquidus phases in a magma reservoir, likely coupled with liquid immiscibility processes, may have played an important role in the genesis of the Ipanema rocks. (literal)
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