Use este identificador para citar ou linkar para este item: http://repositorio.ufc.br/handle/riufc/64751
Tipo: Artigo de Periódico
Título: Syngenetic and diagenetic features of evaporite-lutite successions of the Ipubi Formation, Araripe Basin, Santana do Cariri, NE Brazil
Autor(es): Nascimento Junior, Daniel Rodrigues do
Silva Filho, Wellington Ferreira da
Freire Junior, José Gervásio
Santos, Felipe Holanda dos
Palavras-chave: Evaporites;Gypsum;Ceará State (Brazil);Araripe Basin;Ipubi Formation
Data do documento: 2016
Instituição/Editor/Publicador: Journal of South American Earth Sciences
Citação: NASCIMENTO JUNIOR, Daniel Rodrigues do et al. Syngenetic and diagenetic features of evaporite-lutite successions of the Ipubi Formation, Araripe Basin, Santana do Cariri, NE Brazil. Journal of South American Earth Sciences, [s.l.], v. 72, p. 315-327, 2016.
Abstract: The Ipubi Formation in the Araripe Basin (Northeast Brazil) has evaporite-lutite successions rich in gypsum, a mineral of great regional economic relevance, a highlighted stratigraphic mark, and also a natural boundary for underlying successions potentially analogous to “Pre-Salt” hydrocarbon reservoirs of the Brazilian coastal basins. In this study, syngenetic and diagenetic aspects of the Ipubi Formation at Santana do Cariri (Ceara State) were investigated by means of facies analysis, petrography, and miner- alogical/chemical analyses of evaporites and shales.The results show that the contact relationship between evaporites and marly shales, without signs of subaerial exposure and laterally adjacent, was associated with shallow, calm and somewhat anoxic waterbodies, locally salt-supersaturated (brines) but under seasonal variations of water levels. This scenario could have shared place with hydrothermal phenomena in a playa lake depositional system. Regarding diagenesis, although there is evidence supporting pseudomorphic replacement of gypsum by anhydrite, the burial of the Ipubi Formation would have been limited due to the frequent occurrence of gypsum without any trace of chemical replacement.
URI: http://www.repositorio.ufc.br/handle/riufc/64751
ISSN: 0895-9811
Tipo de Acesso: Acesso Aberto
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