2018-12-052018-12-052018-09-24ARAÚJO FILHO, Roberto Costa. O Grupo Águas Claras da Serra dos Carajás, Paleoproterozoico do Cráton Amazônico : fácies, litoestratigrafia e sequências deposicionais. 2018. 82 f. Dissertação (Mestrado) - Universidade Federal do Pará, Instituto de Geociências, Belém, 2018. Programa de Pós-Graduação em Geologia e Geoquímica. Disponível em: <http://repositorio.ufpa.br/jspui/handle/2011/10448>. Acesso em:.https://repositorio.ufpa.br/handle/2011/10448The Águas Claras succession constitutes a siliciclastic unit with 800 m thick approximately which occurs in the Carajás Basin, Northern Brazil. The evaluation of FD06 drill core of Serra dos Carajás revealed a complex stacking for this sucession, compound by four units denominated here of A, B, C and D formations. The facies analysis allowed the identification of nine lithofacies grouped in three facies associations (FA), representative of braided fluvial, marine and deltaic depositional systems. FA1 - braided river plain - consists of conglomerates with massive bedding and incipient cross stratification, as well as fine to coarse-grained sandstone with massive bedding, cross lamination, tabular and trough cross stratifications organized in metric fining upward cycles. FA2 - foreshore/shoreface - comprises deposits constituted by fine to medium-grained sandstone with low angle cross lamination, planeparallel lamination and massive bedding. FA3 - delta front - includes fine to medium-grained sandstone with sigmoidal cross bedding, cross lamination and massive bedding organized in cycles with coarsening upward tendency. The Formation A constitutes a braided fluvial AF1 deposits interbedded with coarse tuff levels that indicate subaerial volcanic events adjacent to fluvial system during lowstand systems tract. The Formation B is composed exclusively by braided fluvial AF1 deposits developed in lowstand systems tract. The Formation C comprises coastal deposits and marine environments of the AF2 foreshore/shoreface accumulated during transgressive systems tract. This unit also includes host strata of primary manganese mineralization. The Formation D is composed predominantly by braided AF1 fluvial deposits and subordinately by deltaic AF3 packages, developed in lowstand systems tract. The sandstones of these formations were classified as quartz-arenites partially altered by hydrothermalism, indicated mainly by recurrent chloritization throughout the sucession. The stratigraphic stacking of the unit suggests a sedimentation with progradational-retrogradationalprogradational tendency. This sedimentation is likely related to events of thermal (initial) and flexural subsidence, responsible for to generate the accommodation space and to develop the depositional systems. The formations of the Águas Claras Group are inserted in three third order depositional sequences, composed by different systems tracts that reflect Águas Claras sea level fluctuations during of Paleoproterozoic of the Carajás Basin.Acesso AbertoGeologia estratigráfica - Pré-cambrianoSerra dos Carajás - PAFácies (Geologia)Sedimentação e depósitosDissertaçãoCNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIA::ESTRATIGRAFIACNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIA::SEDIMENTOLOGIAANÁLISE DE BACIAS SEDIMENTARESGEOLOGIA