Accès ouvert

High-resolution Biostratigraphy, Depositional History and Palaeoenvironment Based on Foraminifera and Calcareous Nannoplankton, Northwest Niger Delta

Article scientifique 2022 Anglais

Résumé

Abstract An integrated Micropalaeontological analysis approach was employed based on ditch cuttings samples northwest of the Niger Delta. Lithofacies description showed the entire sediment successions consisted of alternating shale and sand lithology. A moderate to the rich recovery of about seventy-one foraminifera and forty calcareous nannofossil species were recovered, having the presence of Miocene foraminifera (Orbulina universa, Globigerinoides bulloideus, Globorotalia obesa, Globorotalia mayeriandGloborotalia continuosa) and nannofossil (Sphenolithus moriformis, Catinaster coalithus, Discoaster berggreniiandDiscoaster kugleri). Three foraminifera planktonic zones were proposed for this study and were correlated to other worldwide zones;Globerigenoides bulloideus,Globeriginoides obliquus obliquusandGloberigenoides primordiusspanning the Neogene (N) 6 to N17 zone. Two calcareous nannoplankton zones were proposed, which are;Helicosphaera intermediaandSphenolithus moriformisspanning the Neogene Nannofossil (NN) 3 to NN11 zone. Three third-order sea-level rises and falls occurred during the Early to Late Miocene within the Niger Delta, with a corresponding paleo-waterdepth from transitional to outer neritic. TheChiloguembelina-3 Shale (16.0 Ma),DodoShale (11.6 Ma) and theUvigerina-8 Shale (9.2 Ma), were associated with transgression. The 15.5 Ma SB of Depositional Sequence 1(Early Miocene), 10.5 Ma SB of Depositional Sequence 2(Middle Miocene) and 8.5 Ma SB of Depositional Sequence 3(Late Miocene) due to progradation. The paleosalintiy based on shell type morphology assemblages suggests a transition from the brackish marginal marine environment to open neritic conditions. The study interval is said to have penetrated sediments of the parallic Early to Late Miocene Agbada formation.

Citer ce document

Joshua, A., Obiosio, E., Ibrahim, H., Nwaejije, E., Israel, T., Amobi, F., Power, U., Olowu, L. (2022). High-resolution Biostratigraphy, Depositional History and Palaeoenvironment Based on Foraminifera and Calcareous Nannoplankton, Northwest Niger Delta. https://doi.org/10.21203/rs.3.rs-1982058/v1

Accès au document

Voir sur le dépôt source

Ce document est hébergé sur son dépôt institutionnel d'origine.

Auteur(s)

Avong S. Joshua Enam O. Obiosio Hamidu Ibrahim Emmanuel C. Nwaejije Timothy Israel Francis J. Amobi Ubit E. Power Love Olowu

Statistiques

Consultations : 1

Téléchargements : 0