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Sequence stratigraphy and controls on sedimentation of the Upper Cretaceous in the Afikpo Sub-basin, southeastern Nigeria

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Abstract

Outcrop-based sequence stratigraphic analysis and palynological biofacies were used to define depositional sequences and their bounding surfaces, and build a sequence stratigraphic model for the Upper Cretaceous succession of the Afikpo Sub-basin. Four unconformity-bounded third-order depositional sequences were identified. Sequence 1 comprises the Nkporo Formation and is subdivided into lowstand system tract (LST) representing an incised valley fill and transgressive systems tract (TST) consisting of estuarine and marine shales and mudstones. The base of the sequence is an angular unconformity correlated to the 77.5 Ma sequence boundary (SB) and the maximum flooding surface (MFS) is dated at 76 Ma. Sequence 2 is diachronous and straddles the lithostratigraphic boundary of the Nkporo and Mamu formations. The upper SB is dated at 71 Ma while associated MFS is dated at 73.5 Ma. Sequence 3 consists of the upper Mamu Formation and the Ajali Formation. The upper SB of sequence 3 is at 68 Ma while the MFS is dated at 69.8 Ma. Sequence 4 is the topmost depositional sequence belonging to the Nsukka Formation. The upper SB is placed at 66.5 Ma. The MFS within this sequence is dated at 67.8 Ma. The sequences encompass from tidally influenced bay head delta and central estuarine environments to coastal and shallow marine shelf environments. Stratigraphic architecture and facies types show that sequence development was controlled to a great extent by eustatic sea level variations though differential subsidence rates encouraged differential rates of sediment supply and rates of sea level change along different segments of the shoreline.

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Authors and Affiliations

  1. Department of Geological Sciences, Nnamdi Azikiwe University, Awka, Nigeria

    Anthony Uwaoma Okoro

  2. Department of Geology, Ebonyi State University, Abakaliki, Nigeria

    Ezekiel Obinna Igwe

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  1. Anthony Uwaoma Okoro
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  2. Ezekiel Obinna Igwe
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Correspondence to Ezekiel Obinna Igwe.

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Okoro, A.U., Igwe, E.O. Sequence stratigraphy and controls on sedimentation of the Upper Cretaceous in the Afikpo Sub-basin, southeastern Nigeria. Arab J Geosci 11, 125 (2018). https://doi.org/10.1007/s12517-018-3468-8

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