Brod, E.R. et al. 2004 - 42¦ CBG - QuÝmica mineral de perovskita da parte central da ProvÝncia Alcal

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Q UÍMICA M INERAL DE PEROVSKITA DA PARTE CENTRAL DA P ROVÍNCIA A LCALINA DE G OIÁS Emanuela Reis Brod 1,2 , José Carlos Gaspar 1,3 , Tereza Cristina Junqueira-Brod 1 , José Affonso Brod 1,3 ( 1 IG/UnB, 2 CAPES, 3 CNPq; [email protected] ) A Província Alcalina da Goiás (PAGO) resulta de intenso magmatismo, durante o Cretáceo Superior, na borda norte da Bacia do Paraná. Sua porção sul é dominada por rochas vulcânicas e piroclásticas, a porção central é caracterizada por diatremas, e na porção norte predominam complexos plutônicos. Em mafuritos, leucita mafuritos e katungitos da parte central da Província, a perovskita é um mineral acessório, formando grãos anédricos a subédricos, com cores que variam do rosa claro ao rosa avermelhado e tamanho entre 0,01 a 0,4mm. Em alguns casos ocorre como microfenocristais e como inclusões em olivina e piroxênio. Não apresenta zonação ótica e está comumente envolta em uma capa de óxido.
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