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Provedor de dados:  Anais da ABC (AABC)
País:  Brazil
Título:  Stratigraphic Relations of the Ipubi Formation: Siliciclastic-Evaporitic Succession of the Araripe Basin
Autores:  FABIN,CARLOS E.
CORREIA FILHO,OSVALDO J.
ALENCAR,MÁRCIO L.
BARBOSA,JOSÉ A.
MIRANDA,TIAGO S. DE
NEUMANN,VIRGÍNIO H.
GOMES,IGOR F.
SANTANA,FELIPE R. DE
Data:  2018-08-01
Ano:  2018
Palavras-chave:  Araripe Basin
Evaporite succession
Interior basins
Ipubi Formation
Sequence stratigraphy
Resumo:  ABSTRACT The Ipubi Formation represents the Aptian-Albian siliciclastic-evaporitic succession of Araripe Basin, NE Brazil. This succession comprises siliciclastic rocks (bituminous shales and claystones) and evaporites (gypsum and secondary anhydrite) and represents part of the lacustrine-shallow marine post-rift phase I. This study used sequence stratigraphy concepts to define the relations between changes in the relative lake level and the formation of Ipubi deposits. Results show that the organic-rich shales of the Ipubi Formation formed during a transgressive pulse that covered large areas of the proximal domains. These deposits overlie a regional unconformity that marks the end of the deposition of the underlying Crato Formation. A High Stand stage that followed the transgression influenced the formation of evaporitic deposits. Climate conditions played a major role in influencing the triggering and stopping of evaporite deposition. Thus, a new relative lake level fall event caused the exposure of the Ipubi Formation deposits, and created another regional subaerial unconformity accompanied by widespread karstification of evaporite beds. A posterior transgression caused the deposition of siliciclastic rocks of the Romualdo Formation over the Ipubi Formation strata, and also promoted a new event of karstification of the Ipubi upper evaporite beds.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502049
Editor:  Academia Brasileira de Ciências
Relação:  10.1590/0001-3765201820170526
Formato:  text/html
Fonte:  Anais da Academia Brasileira de Ciências v.90 n.2 suppl.1 2018
Direitos:  info:eu-repo/semantics/openAccess
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