Record of warm temperate pollen from the Palaeogene–Neogene lignite of southeast Nigeria: Consequences of regional palaeoclimatic changes or tectonics?

Umeji, Obianuju P.; Nwajide, C.S.

doi:10.1016/j.quaint.2013.07.005

Cited by 7 publications

(3 citation statements)

References 20 publications

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“…The environmentally significant palynomorphs encountered in the examined samples include Proxapertites, Spinizonocolpites, Mauritiidites, Laevigatosporites, Verrucatosporites usmensis, and Polypodeaceoisporites. Proxapertites, Spinizonocolpites, Mauritiidites, and Longapertites are pollen of palmae inhabiting similar environment as mangrove swamp of the humid tropics [32][33][34][35][36][37][38] .…”

Section: Discussionmentioning

confidence: 99%

Palynological Age Control and Paleoenvironments of the Paleogene Strata in Eastern Dahomey Basin, Southwestern Nigeria

Bolaji

Ndukwe

Oyebamiji

et al. 2020

Sci Rep

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paleogene deposits are extensively exposed in the eastern Dahomey (Benin) sedimentary Basin in southwestern nigeria. outcrop logging and sampling of lithological sections were systematically carried out at the ibese Quarry, in order to re-establish the age of sediments and reconstruct their depositional environment using samples rich in organic-walled microfossils. two formations were recognized; the Ewekoro and Akinbo Formations. Two main lithological units were identified; limestones and carbonaceous shales. Minor lithologies include ferrugineous sandstones and glauconite. Results from the palynological examination show that terrestrial palynomorphs (spores and pollen) dominate over the marine dinoflagellates cyst species in the samples recovered from the Ewekoro Formation, while samples from the Akinbo formation recorded high abundance with less diversity of the marine dinoflagellates cysts over the terrestrial sporomorph. Age determination/correlation was achieved based on selected stratigraphic index taxa recovered. the samples from ewekoro formation were dated as late early paleocene to early Middle paleocene, based on the presence of the following pollen keytaxa: Proxapertites operculatus, Retidiporites magdalenensis, Spinizonocolpites baculatus, Mauritidiites crassiexinus, Scabratriporites simpliformis, and Echitriporites trianguliformis. the samples from the Akinbo formation were assigned late Middle paleocene to late paleocene, based on the presence of the following pollen key-taxa: Proxapertites operculatus/cursus, Grimsdalea polygonalis, Retibrevitricolpites triangulatus, Psilatricolporites operculatus, Retistephanocolpites williamsi, Bombacidites sp., Apectodinium homomorphum, and Apectodinium quinquelatum. The environmentally significant palynomorph species indicated differences in paleodepositional environments, ranging from shallow marine in the ewekoro formation at the base, up the stratigraphic sequence, to marginal marine (estuarine) depositional environment in the overlying Akinbo formation. The Dahomey Basin is one of the numerous marginal basins formed along the coast of Africa and Brazil following the opening of the South Atlantic. It is an extensive coastal basin located on the margin of the Gulf of Guinea (Fig. 1). The basin is regarded as one of the active basins among the Nigerian sedimentary basins since its subaerial parts are eroding while deposition is taking place in its distal submarine parts. The Dahomey Basin is a combination of the inland/coastal/offshore basin 1 , that stretches from southeastern Ghana through Togo and Republic of Benin to the southwestern part of Nigeria. It was described by 1 as miogeosyncline, a basin in which volcanism has not been associated with sedimentation. The Eastern Dahomey Basin (the Nigerian sector) comprises of the border flanked by the Benin Republic and Nigeria, and the Benin Hinge line 1 , and consists of approximately 3 km thick Cretaceous to Recent sediments 2. The basin was further classified into three viz: pre-lower Cretaceous folded, Cr...

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Section: Discussionmentioning

confidence: 99%

Palynological Age Control and Paleoenvironments of the Paleogene Strata in Eastern Dahomey Basin, Southwestern Nigeria

Bolaji

Ndukwe

Oyebamiji

et al. 2020

Sci Rep

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“…Laevigatosporites discordatus, Zonocostites ramonae and Acrostichum aureum. These are sporomorphs of brackish water swamp species which suggests deposition in a shallow marine/near shore brackish water estuarine setting as seen in Table II [36], [38] and [19]. The presence of Laevigatosporites discordatus and Verrucatosporites usmensis, together with the co-occurrence of the monocolpate pollen; Proxapertites operculatus and Mauritidities crassiexinous and minor influx of the dinoflagellates species from the Ameki samples suggest strong indication of deposition in a marginal marine or near shore, brackish waterestuarine environment in the upper deltaic setting.…”

Section: B Paleoenvironment Of Depositionmentioning

confidence: 99%

“…The presence of Laevigatosporites discordatus and Verrucatosporites usmensis, together with the co-occurrence of the monocolpate pollen; Proxapertites operculatus and Mauritidities crassiexinous and minor influx of the dinoflagellates species from the Ameki samples suggest strong indication of deposition in a marginal marine or near shore, brackish waterestuarine environment in the upper deltaic setting. Laevigatosporites discordatus and Verrucatosporites usmensis are fern spores of swampy fresh water [28], [36], [38], [15] and [10]. However, there is a mixed amount of freshwater species in different proportions with nearshore brackish water forms in Ogwashi-Asaba Formation.…”

Section: B Paleoenvironment Of Depositionmentioning

confidence: 99%

Palynostratigraphy and Palaeoenvironmental Interpretation of Outcrop Formations in Parts of Ini-Akwa Ibom State, Southeastern Niger Delta Basin, Nigeria

Owoeye

Bassey

Harry

et al. 2022

EJGEO

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The palynological study of the outcrop Formations in parts of Ini Local Government Area of Akwa Ibom State, Southeastern Niger Delta Basin, Nigeria has contributed to unraveling the palynostratigraphy and paleoenvironments of the outcrops through the use of diagnostic palynomorphs. The section is made up of carbonaceous shales, sandstones, mudstones and claystones. The conventional maceration technique for recovering acid-insoluble organic-walled microfossils from sediments was used to prepare twenty outcrop samples for palynological studies. The samples produced poor to fair diversity assemblages of palynomorphs. A total of 176 palynomorphs species were recorded, with 48% pollen grains, 33% spores, 12% dinoflagellate cysts, 5% fungal spores, and 2% microforam test wall linings. Based on stratigraphically selected index taxa recovered,age determination and correlation wereestablished. The samples from Imo Formation were assigned Late Paleocene-Eocene based on Psilatricolporites Crassus, Retitricolporites irregularies, Psilatricolporites sp. and Leiotriletes adriennis with the presence of Paleocene dinoflagellate cysts such as Lejeunacysta beninensis and Selenopemphix nephroides. Ameki samples were dated Early-Middle Eocene based on Proxapertites operculatus, Retistephanocolpites williamsi, Mauritidites crassiexinius, Monocolpites marginatus and Longapertites marginatus. Ogwashi-Asaba shale samples were assigned Late Eocene-Early Oligocene due to the abundant presence of Verrucatosporites usmensis, Laevigatosporites discordatus and Retitricolporites irregularis while Eze-Aku samples were tentatively assigned Paleocene because of the presence of two pollen index fossils Proxapertites operculatus and Pachydermites diederixi. Inferred depositional conditions suggest that Imo Formation was deposited in a shallow marine or near shore brackish water estuarine environment. The Ameki Formation was accumulated in a marginal marine or near shore, brackish water-estuarine environment in the upper deltaic setting. The Ogwashi-Asaba Formation was deposited in a progradational shoreline moving between the brackish water and fresh water deltaic plain. The Eze-Aku Formation was deposited in an upper foreshore fresh water environment. The palynological study of the samples are Paleogene Formations while the paleoenvironment is in a costal deltaic to shallow-marine environment and are appropriate for hydrocarbon accumulations and exploration.

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Multi‐Parameter Investigation of Cretaceous to Palaeocene Sedimentary Sequences in the Anambra and Niger Delta Basins, Nigeria: Organic Matter Characterisation, Palynofacies and Implications for Palaeoclimate and Sea‐Level Changes

Omietimi,

Lenhardt,

Yang

et al. 2024

Geological Journal

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The Anambra Basin of Nigeria, part of the larger West and Central African Rift System (WCARS) across Africa, contains primarily Cretaceous to Palaeocene shallow to marginal marine and freshwater sedimentary deposits. The organic‐rich deposits of the Cretaceous Nkporo and Mamu formations within the Anambra Basin and the Palaeocene Imo Formation of the Niger Delta Basin constitute important conventional source rocks. Despite its economic significance, research on organic matter characterisation, palynofacies, sea‐level fluctuations, palaeoclimate, hydrogeography, basin restriction, palaeobathymetry and the factors controlling organic matter preservation remains largely undocumented. The here presented new inorganic and organic geochemical and organic petrography data of the Cretaceous to Palaeocene deposits serve to refine the regional interpretation at a basinal scale and within the supra‐regional context of the WCARS. Geochemical palaeotemperature proxies suggest a warm and humid tropical palaeoclimate during the Late Cretaceous within the study area. Furthermore, the measured TOC values indicate poor to very good organic content. Palynofacies analysis revealed high abundances of opaque and translucent phytoclasts and low amounts of palynomorphs with negligible amorphous organic matter (AOM) in the studied mudrocks. Two palynofacies groups suggest shallow‐marine conditions in a proximal shelf setting and a heterolithic oxic basin. The palynofacies of the upper Imo Formation reveal higher percentages of dinoflagellate cysts during the early highstand phase, with equidimensional, opaque phytoclasts representing the maximum flooding phase, accompanied by warmer conditions. Additionally, abundant terrestrial phytoclasts, Deltoidospora spp., Classopollis spp. and geochemical indicators collectively indicate warm tropical climatic conditions consistent with geochemical interpretations. The palaeobathymetry reconstructions suggest a shallow seaway during the Upper Cretaceous in the Anambra Basin.

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Record of warm temperate pollen from the Palaeogene–Neogene lignite of southeast Nigeria: Consequences of regional palaeoclimatic changes or tectonics?

Cited by 7 publications

References 20 publications

Palynological Age Control and Paleoenvironments of the Paleogene Strata in Eastern Dahomey Basin, Southwestern Nigeria

Palynological Age Control and Paleoenvironments of the Paleogene Strata in Eastern Dahomey Basin, Southwestern Nigeria

Palynostratigraphy and Palaeoenvironmental Interpretation of Outcrop Formations in Parts of Ini-Akwa Ibom State, Southeastern Niger Delta Basin, Nigeria

Multi‐Parameter Investigation of Cretaceous to Palaeocene Sedimentary Sequences in the Anambra and Niger Delta Basins, Nigeria: Organic Matter Characterisation, Palynofacies and Implications for Palaeoclimate and Sea‐Level Changes

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