Cretaceous foraminiferal biostratigraphy and palaeoecology of Ikomo-1 well, Calabar flank, southeastern Nigeria

Adegbie, AT; Bassey, CE

doi:10.4314/jmg.v43i1.18862

Cited by 1 publication

(3 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2 and 3). The origin of the Calabar Flank is closely linked with the separation of the African plate from the South American plate ( Figure 3A and the formation of the Gulf of Guinea during the Mesozoic era (Petters, 1982;Adegbie and Bassey, 2007). The geologic history of the sedimentary basins of Southern Nigeria are marked by three tectonic phases (Murat,1972).…”

Section: Geological Settingmentioning

confidence: 96%

“…The geologic history of the sedimentary basins of Southern Nigeria are marked by three tectonic phases (Murat,1972). During tectonic activity, the axis of the main basins was displaced resulting in the formation of three successive basins, one of which is present in Calabar Flank (Adegbie and Bassey, 2007). Predominant tectonic structures of the Calabar Flank ( Figure 3B and C) comprise a NW-SW trending horst structure (Ituk High) and a graben, the Ikang Trough (Nyong and Ramanathan, 1985;Petters and Reijers, 1987).…”

Section: Geological Settingmentioning

confidence: 99%

“…The Calabar Flank has been extensively studied from a geological perspective (e.g. Reyment, 1965;Murat, 1972;Adeleye and Fayose, 1978;Petters, 1979Petters, , 1980Petters and Ekweozor, 1982;Akpan, 1985;Nyong and Ramanathan, 1985;Braide, 1987;Nyong, 1993, 1994;Adegbie and Bassey, 2007;Ekpo et al, 2012Ekpo et al, , 2013Boboye and Okon 2014;Ukpong and Ekhalialu, 2018;Itam et al, 2019). Early Investigations of its biostratigraphy have been documented by Reyment (1965), Dessauvagie (1965) and Nyong and Ramanathan (1985).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Foraminiferal Study of Nkporo Shale Exposures, Calabar Flank (Se Nigeria): Age and Depositional Environment

Itam

Emeka

2019

J. Sed. Env.

View full text Add to dashboard Cite

Foraminiferal analysis of the sedimentary deposits of Nkporo shale exposed at PAMOL along Calabar/Odukpani Road, in the Calabar Flank, Southeastern Nigeria, was investigated in order to determine its geological age and paleoenvironmental conditions. The lithology is predominantly composed by shale with traces of siltstone and sandstone. Shale is generally light to dark grey, occasionally light brown, sub-fissile to fissile, moderately hard, carbonaceous, and slightly ferruginous. Results of foraminiferal analysis showed that the samples consist predominantly of arenaceous/agglutinated benthic foraminifera. Calcareous planktic foraminifera are absence and calcareous benthic taxa are almost absence of calcareous. The occurrence of the following foraminifera taxa Ammobaculite sp., Haplophragmoides sahariense, Haplophragmoides talokaense, Trochammina sp., Trochammina dustuna, Ammobaculites amabensis and Bolivina sp. suggest that sediments in the study area were deposited during the Maastrichtian age. The paleo-depositional-environment should occur in transitional marine settings, probably a marsh/lagoon. In the study area, calm hydrodynamic conditions prevailed. They favored the accumulation of fine-grained sediment and organic matter which gave rise to oxygen scarcity. The environment would be stressful for benthic foraminifera not only because of oxygen scarcity but also due to the variability of water salinity (hypo to hypersaline). ESTUDO DE FORAMINÍFEROS DOS FOLHELHOS DE NKORHO, CALABAR FLANK (SE DA NIGERIA): IDADE E AMBIENTE DEPOSICIONAL ResumoA análise de foraminíferos dos depósitos sedimentares do folhelho Nkporo expostos em PAMOL ao longo da estrada de Calabar/Odukpani, em Calabar Flank, sudeste da Nigéria, foi estudada tendo em vista determinar sua idade relativa e condições paleoambientais. A litologia é predominantemente composta por folhelho com camadas de siltito e arenito. O folhelho é, em geral, cinza claro a escuro, ocasionalmente marrom claro, sub-físsil a físsil, moderadamente consolidado, carbonáceo e levemente ferruginoso. Os resultados da análise dos foraminíferos mostraram que as amostras estudadas contêm predominantemente foraminíferos bentónicos arenáceos/aglutinantes. Não foram encontrados foraminíferos planctónicos, estando também quase ausentes táxons bentónicos com carapaça constituída por carbonato de cálcio. A ocorrência dos seguintes taxa Ammobaculites sp., Haplophragmoides sahariense, Haplophragmoides talokaense, Trochammina sp., Trochammina dustuna, Ammobaculites amabensis e Bolivina sp. sugerem que os sedimentos na área de estudo foram depositados durante o Maastrichtiano (Cretaceo superior). A sedimentação deverá ter ocorrido em ambiente marinho de transição, provavelmente em pântanos/lagoas. Na área de estudo, prevaleceram condições hidrodinâmicas calmas que favoreceram o acúmulo de sedimentos finos e matéria orgânica, que originou a escassez de oxigênio. O ambiente seria estressante para os foraminíferos bentónicos, não só devido à escassez de oxigênio, mas também devido à variabilidade da salinidade da água (hipo a hipersalina). Palavras-chave: Bioestratigrafia. Foraminíferos Bentônicos. Aglutinantes. Maastrichtiano. Cretáceo. Ambiente marinho de transição.

show abstract

Section: Geological Settingmentioning

confidence: 96%

Section: Geological Settingmentioning

confidence: 99%