2019-10-102019-10-102013LEMOS, Diego Oliveira. Análise de fácies da Formação Barreiras, nas regiões de Apeú-Castanhal e Outeiro-Belém (PA). Orientador: Joelson Lima Soares. 2013. 86 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/2169 .Acesso em:.https://bdm.ufpa.br/jspui/handle/prefix/2169The Barreiras Formation deposits, Miocene age, have a wide distribution in the Brazilian coast. In the state of Para some of the best exposures of this unit are located in the localities of Vila de Apeú (Castanhal) and Outeiro island (Belem). In these area its was realized facies studies and the stratigraphic correlation between the Barreiras Formation outcrops allowing to understand and interpret, through different lithofacies, the likely depositional environment of the Barreiras Formation on the northeastern Pará. Ten sedimentary facies was described composed predominantly of siliciclastic rocks such as: claystone, sandstones and conglomerates. These facies were grouped into two facies associations which represent depositional environments of the fluvial channel and tidal flats. The deposits of fluvial channels have a more restricted distribution compared to the tidal flats. The tidal flats deposits are composed predominantly of clay facies. Locally these clay deposits present mud cracks and bioturbation. Sandstones with crossbedding and plane-parallel stratification are found intercalated with these clay deposits. Heterolitics layers with tidal beddings (wavy) pass vertically to paleosoil deposits that occur locally, and they are characterized by mottled appearance due to bioturbation caused by root marks and worm tubes. The fluvial channel deposits are characterized by the predominance of sandy and conglomeratic facies. Trough crossbedding sandstone lags are the most common facies. These deposits partially erode the tidal flat deposits, as evidenced by the presence of erosive truncations, fallen land blocks and conglomeratic lags at the boundary between the two facies associations. Ophiomorpha ichonofossils are abundant in fluvial channel deposits and rarer in tidal flats. This ichnofossil usually represent dwelling builds of the Callianassa decapod crustaceans in environments influenced by marine waters similar to estuaries. The deposits studied in this work represent the record of transitional environments characterized by tidal influences and continental influxes made by fluvial channels.Acesso AbertoGeologia estratigráfica (Mioceno) – ParáFácies sedimentaresFormação BarreirasMapa FaciológicoPaleoambienteCNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIA::ESTRATIGRAFIATrabalho de Curso - Graduação - Monografia