Palynostratigraphy and paleoenvironmental reconstitution of the Paleocene-Eocene N’kapa Formation: Ngata and Moulongo series (Douala sub-basin, Cameroon)

Mbesse, Cécile Olive; Bessong, Moïse; Takem, John Eyong; Taku, Junior Agbor; Ngos, Simon; Gerrienne, Philippe; Abolo, Alexis Nyangono; Digbehi, Zéli Bruno; Ntamak-Nida, Marie Joseph; Roche, Émile

doi:10.1016/j.geobios.2021.08.001

Cited by 4 publications

(7 citation statements)

References 24 publications

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“…Consequently, based on paleo-environmental markers such as Cyathidites, Concentricytes sp., microforaminiferal test lining, Echitriporites trianguliforms, Monocolpites marginatus, Spinizonocolpites sp., and Longapertites sp., a conceptual diagram showing the dominant environment of deposition in the study area is provided in Figure 15a. Cyathidites and Concentricytes sp., recovered at OB and IJ suggests an open freshwater environment of deposition, while fungal spores at the same location favors deposition under swampy conditions 41,73 . Deposition under nearshore environment is indicated by the presence of microforaminiferal test lining 48 and Echitriporites trianguliforms at ER, while marginal marine condition under the in uence of rivers is indicated by Monocolpites marginatus 45 also at ER (Figure 14).…”

Section: Interpretation Of Age and Paleoenvironment From Palynomorphs...mentioning

confidence: 98%

“…Acrostichum aureum are principal ferns currently growing within mangrove vegetation and are adapted to coastal areas associated with mangrove vegetation, areas inundated with saline waters, open salt marshes, coastal swamps, and areas along estuarine rivers 71 . Laevigatosporites on the other hand are monolete pteridophyte spores of ferns found in humid climate 72,73 . Therefore, the prevalent vegetation type in the Late Cretaceous of the study area was tropical mangrove.…”

Section: Interpretation Of Age and Paleoenvironment From Palynomorphs...mentioning

confidence: 99%

“…Echitriporites trianguliforms are proteaceae i.e., family of shrubs and trees, while Concentricytes sp. are indicative of dominant uvial system or shallow environment proximal to shorelines 41,73 . Palynomorphs such as Spinizonocolpites sp.…”

Section: Interpretation Of Age and Paleoenvironment From Palynomorphs...mentioning

confidence: 99%

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Paleoenvironment and paleoclimate of the Late Cretaceous Ise Formation, Eastern Dahomey Basin.

Oshomoji¹,

Ndukwe

Omosanya³

et al. 2022

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The paleoenvironment and paleoclimate of the Ise Formation remain poorly understood, despite its importance for the Late Cretaceous paleoenvironment and geology of the Dahomey Basin and Africa in general. This is due to the paucity of outcrops and drilled samples of the formation. This study investigates the paleoenvironmental and paleoclimatic setting of the Ise Formation through sedimentological and palynological analyses of fifty sediment samples. The sediments were recovered from four exposed sections of the formation, three of which are recently exposed, in the Eastern Dahomey Basin, SW Nigeria. The examined sediments are largely coarse-grained, poorly sorted, gravelly-sand to sandy-gravels, and are dominated by spores and pollens. The Laevigatosporites sp. and the Sapotaceae sp. are the most abundant spores and pollens in the sediments while minor occurrences of Monocolpites sp., Cyathidites minor, Retitricolporites sp., and Spinizonocolpites sp. were recovered. Concentricytes sp. was the only algae recovered, while microforaminiferal wall lining was the only foraminifera recovered. Textural properties of the sediments indicate textural immaturity and proximity to the source area. The occurrence of Monocolite sp., Foveotriletes margaritae, Echitriporites trianguliforms, Cyathidites, and Longapertites sp. indicate a Maastrichtian to Early Paleocene age for the Ise Formation. The vegetation cover was mainly mangrove with palms, shrubs, and forests, while the environment of deposition was swamp to marginal nearshore. A dominant mild to warm tropical climate during the deposition of the formation was inferred based on the recovery of Retitricolporites sp., Monocolpites marginatus, Sapotaceae sp., and Spinozonocolpites sp. from the samples. These conclusions support the hypothesis of a regional shallow environment setting during the Maastrichtian and a warm regional climate in Africa during the Early Paleocene.

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Section: Interpretation Of Age and Paleoenvironment From Palynomorphs...mentioning

confidence: 98%

Section: Interpretation Of Age and Paleoenvironment From Palynomorphs...mentioning

confidence: 99%

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Paleoenvironment and paleoclimate of the Late Cretaceous Ise Formation, Eastern Dahomey Basin.

Oshomoji¹,

Ndukwe

Omosanya³

et al. 2022

Preprint

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“…It displays some local differences in the lithological aspect, the similar structural and stratigraphic characteristics, with tectonic evolution which is subdivided into three classical stages commonly associated with the evolution of the passive margin, namely: the pre‐rift stage, the syn‐rift stage and the post‐rift stage (Brownfield & Charpentier, 2006; Nguéné et al, 1992; Reyre, 1984). Only the syn‐rift and post‐rift stages have been mentioned in the Cameroonian epicontinental basin with sedimentary succession which has been dated from the Lower Cretaceous to the present (Manga, 2008; Mbesse et al, 2021; Mfayakouo et al, 2021; Nguéné et al, 1992; Reyre, 1984). The sedimentary succession of the syn‐rift stage (Lower to mid‐Cretaceous) in the Douala Basin as well as in the West African margin basin has attracted the attention of the petroleum companies because of the presence of source rock and other elements of the petroleum system as reservoir and seal (Brownfield & Charpentier, 2006; Ntamak‐Nida et al, 2008; Pauken, 1992; Yugyè et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Only the syn-rift and post-rift stages have been mentioned in the Cameroonian epicontinental basin with sedimentary succession which has been dated from the Lower Cretaceous to the present (Manga, 2008;Mbesse et al, 2021;Mfayakouo et al, 2021;Nguéné et al, 1992;Reyre, 1984). The sedimentary succession of the syn-rift stage (Lower to mid-Cretaceous) in the Douala Basin as well as in the West African margin basin has attracted the attention of the petroleum companies because of the presence of source rock and other elements of the petroleum system as reservoir and seal (Brownfield & Charpentier, 2006;Ntamak-Nida et al, 2008;Pauken, 1992;Yugyè et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Palaeoenvironment of the Albian‐Cenomanian Mundeck Formation in the Douala Basin (SW, Cameroon): Evidence from facies analysis and geochemistry

et al. 2023

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The Lower Cretaceous syn‐rift deposits of the Douala Basin (Mundeck Formation), located in the equatorial West African margin were investigated in order to determine the palaeoenvironment and organic matter source, redox conditions, palaeoclimate, and tectonic settings, based on facies, organic and inorganic geochemical analyses. The sediments consist of pebble, coarse, medium‐ to fine‐grained sandstone, siltstone, and grey to black fossiliferous shales. The shales are characterized by an average total organic carbon (TOC) of 1.02%, fair to poor source generative potential with present‐day hydrogen index values, which range from 31 to 350 mg HC/g TOC suggesting that the shale contains Type III kerogens with mainly gas generative potential. The organic particles are dominated by phytoclasts (40% on average) and non‐fluorescent amorphous organic matter (34% on average). The palynomorphs represent about 26% on average with a large amount of pollen grain and a minor amount of dinoflagellate cysts and microforaminifera test linings. The inferred depositional environment of the studied sediments is an alluvial fan to fluvio‐lacustrine with shallow marine incursion. This depositional environment received the contribution of aquatic algae and microorganisms with a large amount of terrestrial organic matter, evidenced by the presence of some dinoflagellate cysts and microforaminifera test linings, and relatively higher amounts of SiO2, Al2O3, and phytoclasts. The presence of trace elements such as Ba, Sr, V, Ni, Co and Cr in the analysed samples and their ratio, suggest suboxic to anoxic conditions of deposition with low salinity. The warm to cold and dry climatic conditions prevailed during the deposition of the Mundeck deposits and sediments from active continental margin setting during the lower Cretaceous periods in the Douala Basin as confirmed by inorganic geochemical data. This study sheds light on the early stage of the evolution of the Douala Basin which could be integrated into the context of a mid‐Jurassic to lower Cretaceous regional evolution of the opening of a passive margin. This evolution is characterized by an alluvial fan, fluviatile, lacustrine, lagoon and marine depositional system. This depositional system is recognized as part of the petroleum system recognized within the syn‐rift deposits in the others basins along the West African margin, where giant hydrocarbons have been discovered.

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High-resolution sequence stratigraphy from well-log patterns and base-level variations of the Paleocene - Early Eocene N’kapa Formation, Douala onshore Basin (SW Cameroon)

Lebogo

Bisso

Essi

et al. 2023

Preprint

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The present study aims to establish the stratigraphic architecture in order to understand the depositional history during the Paleocene- Early Eocene interval in the Douala Onshore Basin. The sequence stratigraphic analysis from gamma-ray logs and well cuttings was used to define stratigraphic surfaces and systems tracts based on the depositional sequence model. The results obtained show that the Paleocene-Early Eocene interval could be subdivided into three lithostratigraphic units (Unit 1, Unit 2, and Unit 3) of Middle Paleocene - Late Paleocene, Late Paleocene - Early Eocene, and Early Eocene age respectively. The sequence stratigraphic interpretation revealed three major stratigraphic surfaces : the sequence boundary (SB1) of the Middle Paleocene top, the transgressive surface (TS2) of the Late Paleocene, and the maximum flooding surface (MFS2) of the Early Eocene. The first highstand systems tracts (HST1) of the Middle Paleocene, the lowstand systems tract (LST2) of the Late Paleocene, the transgressive systems tract (TST2) of the Late Paleocene to Early Eocene, and the second highstand systems tracts (HST2) of the Early Eocene are the depositional sequences observed. The Paleocene-Eocene interval is therefore globally prograding, interrupted by a short transgressive episode of Late Paleocene to Early-Eocene age. Three cycles of base-level have been identified: the first cycle of base-level fall dated Middle Paleocene, the second cycle of rapid base-level rise which occurred between Late Paleocene to Early Eocene, and the third cycle of base-level fall dated Early Eocene. This observation confirms that the main factor which influenced the depositional history of Paleocene- Early Eocene succession in the Douala Onshore Basin was the eustatic sea-level changes due to the Cenozoic post-rift subsidence of the West African margin.

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Palynostratigraphy and paleoenvironmental reconstitution of the Paleocene-Eocene N’kapa Formation: Ngata and Moulongo series (Douala sub-basin, Cameroon)

Cited by 4 publications

References 24 publications

Paleoenvironment and paleoclimate of the Late Cretaceous Ise Formation, Eastern Dahomey Basin.

Paleoenvironment and paleoclimate of the Late Cretaceous Ise Formation, Eastern Dahomey Basin.

Palaeoenvironment of the Albian‐Cenomanian Mundeck Formation in the Douala Basin (SW, Cameroon): Evidence from facies analysis and geochemistry

High-resolution sequence stratigraphy from well-log patterns and base-level variations of the Paleocene - Early Eocene N’kapa Formation, Douala onshore Basin (SW Cameroon)

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