2019-11-072019-11-072013SANTOS, Regiane Roberta Trindade. Geologia, petrografia e microscopia eletrônica de varredura, do granodiorito grotão, Terreno Granito-Greenstone de Rio Maria, Sudeste do Estado do Pará. Orientador: Claudio Nery Lamarão. 2013. 73 f. Trabalho de Curso (Bacharelado em Geologia) - Faculdade de Geologia, Instituto de Geociências, Universidade Federal do Pará, Belém, 2013. Disponível em: https://bdm.ufpa.br/jspui/handle/prefix/2439. Acesso em:.https://bdm.ufpa.br/jspui/handle/prefix/2439The Grotão granodiorite is situated southeast of Xinguara or northwest of Rio Maria, southeastern Pará state. It is represented by biotite granodiorite of Archean age. The geological mapping allowed better define the spatial distribution of this unit, which outcrops as rounded blocks and flooring, sometimes cut by mafic dykes in the NS direction. As a result, the geological map of the area of occurrence of the granodiorite Grotão was redefined. Macroscopically these rocks are isotropic, have medium granulation, and light gray color. The modal data when plotted in the QAP diagram, plots exclusively on the field of granodioritic rocks. The essential mineralogy of these rocks is dominantly composed of plagioclase, quartz and feldspar, with biotite as the main ferromagnesian mineral. The average content of mafic minerals is 4.5%, these rocks are classified as leucocratic. SEM-EDS analyses of zircons and biotite in the Grotão granodiorite showed significant differences when compared with zircons and biotites of the Rio Maria Granodiorite, allowing to suggests that they are two distinct geological units.Acesso AbertoMicroscopia Eletrônica de VarreduraGranodiorito ArqueanosTerreno Granito - Greenstone de Rio MariaPetrografiaCNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIATrabalho de Curso - Graduação - Monografia