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Late Miocene–Early Pliocene planktic foraminiferal biostratigraphy of deep offshore southwestern Niger Delta

Article scientifique 2021 Anglais

Résumé

Abstract The planktic foraminiferal biostratigraphy of the deep offshore southwestern Niger Delta has been studied from three wells (DPW-1, DPW-2 and DPW-3). A total of 418 ditch cutting samples (104 samples from DPW-1, 165 from DPW-2 and 149 from DPW-3) taken at 18-m intervals were subjected to standard micropaleontological processing techniques. In total, 42, 52 and 40 planktic foraminiferal species were identified from DPW-1, DPW-2 and DPW-3, respectively. The identified planktic species allow the delineation of the studied section into four biozones—Globorotalia acostaensis(N16),Globigerinoides obliquus extremus/Globorotalia merotumida(N17),Globorotalia margaritae primitiva(N18) andGloborotalia margaritae evoluta/Globigerina nepenthes(N19) zones, based on the first appearance datums (FADs), last appearance datums (LADs) of the nominate taxa and associated assemblages. The well sections dated Late Miocene to Early Pliocene based on the occurrence of certain diagnostic planktic foraminiferal datums such as FADsGloborotalia acostaensis,Globigerinoides obliquus extremus,Globorotalia merotumida/plesiotumida,Globorotalia margaritae primitivaand the LADsGlobigerina nepenthes, Globorotalia margaritae primitivaandGloborotalia margaritae evoluta. The Miocene/Pliocene boundary was placed at the FADGloborotalia margaritae primitiva.In the Niger Delta, this boundary is commonly placed at the FADsGloborotalia margaritae margaritaeandGloborotalia crassaformisprobably due to nonrecovery ofGloborotalia margaritae primitiva.However, in this studied section of the deep offshore southwestern Niger Delta, FADGloborotalia margaritae primitivaoccurs consistently in the three study wells and is therefore considered an appropriate datum for the placement of the Miocene/Pliocene boundary.

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Adebambo, B., Fadiya, S. (2021). Late Miocene–Early Pliocene planktic foraminiferal biostratigraphy of deep offshore southwestern Niger Delta. https://doi.org/10.1007/s42452-021-04316-x

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Bamidele Adeniyi Adebambo Suyi Lawrence Fadiya

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