Artículos de revistas
Syngenetic And Diagenetic Features Of Evaporite-lutite Successions Of The Ipubi Formation, Araripe Basin, Santana Do Cariri, Ne Brazil
Registro en:
Journal Of South American Earth Sciences. Pergamon-elsevier Science Ltd , v. 72, p. 315 - 327, 2016.
0895-9811
WOS:000389556100022
10.1016/j.jsames.2016.10.001
Autor
do Nascimento
Daniel Rodrigues
Jr.; da Silva Filho
Wellington Ferreira; Freire
Jose Gervasio
Jr.; dos Santos
Felipe Holanda
Institución
Resumen
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) 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 fades analysis, petrography, and mineralogical/chemical analyses of evaporites and shales. The results show that the contact relationship between evaporites and manly 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. (C) 2016 Elsevier Ltd. All rights reserved. 72 315 327 Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)