2019-08-302019-08-302009-12FREITAS, Cícero Henrique Mendonça. Estudo dos fluidos hidrotermais responsáveis pela escapolização de granitóides de Serra Dourada, região de Carajás. Orientador: Raimundo Netuno Nobre Villas. 2009. 45 f. Trabalho de Curso (Bacharelado em Geologia) – Faculdade de Geologia, Instituto de Geociências, Universidade Federal do Pará, Belém, 2009. Disponível em: http://bdm.ufpa.br/jspui/handle/prefix/1843. Acesso em:.http://bdm.ufpa.br/jspui/handle/prefix/1843The research area is located in Serra Dourada, to east of the Sossego Cu-Au deposit, Carajás Mineral Province. The scapolitization is a kind of common sodic metasomatism in the rocks that compose this area, having manifested as in the rocky mass as in veinlets. The methodical procedures had involved field campaign, selected samples, smoothly blades confections, petrographic analysis of the altered rocks, fluid inclusions (FI) mapping contained in quartz crystals and microthermometric analysis. Two-phase and three-phase FI were recognized, these last one with saturation tentatively identified as halite. The fill degree had a variation from 0,7 to 0,9, while fluids density was from 0,87 to 1,20 g/cm3 band, with the highest values corresponding the three-phase FI. The hydrothermal fluids responsible for the scapolitization had a great amount of silica (denounced for the quartz formation), sodium, calcium and chlorine, all these as essencial components, beyond aluminum, in the scapolite generation. Because the aluminum-silicate stability to require NaCl high activity, is very probably that it precipitated of bigger salinity fluids (42-45% eq. weigth of NaCl) and temperature (>350°C) represented for three-phase FI. The two-phase FI has disclosed moderate salinity (generally, 20-25% eq. weigth of NaCl) and homogenization temperature (generally, 200-300°C) indicating, initially, that could have had dilution to the measure that hydrothermal system cooled. It was not observed, however, gradual reduction of the salinity with temperature fall. Otherwise, was evidenced existence of a gap between 42% and 24% in eq. weight of NaCl, what weaken hypothesis of a possible dilution and fortifies the idea of an independent fluid, even if they have the same composition. The source of fluids is an opened subject.Acesso AbertoEscapolitizaçãoInclusões fluidasSerra Dourada ( Carajás )Depósito cuproauríferoCNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIATrabalho de Curso - Graduação - Monografia