2015-03-132015-03-132014-03FARIA, Débora Almeida et al. Geology, Geochemistry, and Geochronology (U-Pb) of the Rio Fortuna Gneiss - Serra do Baú Intrusive Suite - Paraguá Terrane - SW Amazonian Craton. Brazilian Journal of Geology, São Paulo, v. 44, n. 1, p. 139-154, mar. 2014. Disponível em: <http://ppegeo.igc.usp.br/pdf/bjg/v44n1/a11v44n1.pdf>. Acesso em: 10 mar. 2015. <http://dx.doi.org/10.5327/Z2317-4889201400010011>.2317-4889https://repositorio.ufpa.br/handle/2011/6422The Rio Fortuna Gneiss crops out in the ¬Serra Santa Barbara, near the Fortuna military headquarters, on the Brazil-Bolivia border. These orthogneisses are located in a portion of the Paraguá terrain affected by the Sunsás Orogeny (1.0-0.9 Ga.). They are classified as monzo to granodiorite orthogneisses and underwent at least three episodes of deformation. The U-Pb zircon age of 1,711 ± 13 Ma obtained by laser ablation MC-ICP-MS is interpreted as the crystallization age of this orthogneiss. Geochemically, these rocks form a sequence comprising acidic subalkaline magmatism, calc-alkalic-type high-K, and metaluminous to peraluminous.engAcesso AbertoGeoquímicaGeologia estruturalGeocronologia U-PbRio Fortuna GnaisseCráton AmazônicoTerreno ParaguáMato Grosso - EstadoAmazônia brasileiraArtigo de Periódico