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A faixa de dobramentos neoproterozoica Sergipana ocorre no limite nordeste do Craton do Sao Francisco. Este trabalho apresenta dados estratigraficos e sedimentologicos sobre diamictitos e carbonatos, metassedimentos do Dominio Vaza-Barris, Faixa Sergipana. As rochas metassedimentares da porcao centro-sul da Faixa Sergipana (dominio Vaza-Barris) sao subdividas nos Grupos Miaba (Formacoes Itabaiana, Jacarecica e Jacoca) e Vaza-Barris (Formacoes Capitao-Palestina, Olhos d’Agua e Frei Paulo-Ribeiropolis). Na regiao de Pinhao-Pedra Mole (SE), mapeada em detalhe, ocorrem boas exposicoes das Formacoes Capitao-Palestina e Olhos d’Agua, ao longo do flanco normal do anticlinorio de Pinhao. Metadiamictito, metagrauvaca, metarenito arcosiano macico e metapelito laminado formam a associacao de facies da Fm. Capitao-Palestina, representando sedimentacao marinha gravitacional, com fluxos de detritos. Metacalcarenito com estratificacao cruzada/truncada de baixo ângulo (hummocky) e metacalcilutito formam a associacao de facies da Fm. Olhos d’Agua, representando sedimentacao carbonatica de retrabalhamento, com facies de tempestitos. O Grupo Vaza-Barris constitui-se numa sequencia deposicional tipo 1, depositada discordantemente sobre o Grupo Miaba, apresentando os tres tratos de sistemas principais: (1) trato de mar baixo - constituido por fluxos de detrito/lama em sistema deposicional marinho profundo; (2) trato transgressivo - rampa carbonatica retrogradante; (3) trato de mar alto – depositos silicilasticos progradacionais de sistema deposicional marinho raso. Palavras-chave: Estratigrafia de sequencias, Faixa Sergipana, Neoproterozoico, tratos e sistemas deposicionais, fluxos gravitacionais. ABSTRACT STRATIGRAPHY AND SEDIMENTARY EVOLUTION OF NEOPROTEROZOIC DIAMICTITES AND CARBONATES IN THE VAZA BARRIS DOMAIN, SERGIPANA FOLD BELT, NORTHEASTERN BRAZIL. The Neoproterozoic Sergipano Fold Belt occurs on the northeastern margin of the Sao Francisco Craton. This study presents stratigraphic and sedimentologic data about the metasedimentary framework of the Vaza-Barris Domain, Sergipano Fold Belt. The metasedimentary rocks of this belt in central-southern portion occur into Vaza-Barris Domain and are subdivided into the following groups: Miaba (Itabaiana, Jacarecica and Jacoca formations) and Vaza-Barris (Capitao-Palestina, Olhos d’Agua e Frei Paulo-Ribeiropolis formations). In the Pinhao-Pedra Mole (Sergipe) region, mapped in detail, there are good exposures of Capitao-Palestina and Olhos d’Agua formations on the normal limb of Pinhao anticlinorium. Massive metadiamictites, massive metagraywackes and arkosean meta-arenites, laminated metapelites and metarhythmites form the facies association of the Capitao-Palestina Formation, representing mainly a gravitational marine sedimentation with debris flows. Metacalcarenites with low-angle cross/truncated bedding, metacalcilutites with plannar lamination and massive metacalcarenite form the facies association of the Olhos d’Agua Formation, representing a reworked carbonatic sedimentation with tempestite facies. The Vaza Barris Group is a type 1 depositional sequence, unconformably resting upon the Miaba Group, with the three main system tracts: (1) low sea-level tract – with debris / mud flows in a deep marine environment; (2) transgressive tract – retrograding carbonatic ramp; (3) high sea-level tract – prograding siliciclastics in a shallow marine environment. Keywords: Sequence stratigraphy, Sergipano Fold Belt, Neoproterozoic, depositional tracts and systems, gravitational flows.

geonomos

ESTRATIGRAFIA E EVOLUÇÃO SEDIMENTAR DE DIAMICTITOS E CARBONATOS NEOPROTEROZÓICOS NO DOMÍNIO VAZA-BARRIS, FAIXA DE DOBRAMENTOS SERGIPANA, NORDESTE DO BRASIL.