Graphic correlation and paleoenvironmental investigation of the upper Eocene–lower Oligocene sediments in the Dahomey Basin, southwestern Nigeria: insights from palynomorphs.
This study presents the results of a comprehensive qualitative and quantitative palynological analysis of four shallow boreholes (Epe-1, Olokonla-1, Ikoyi-1 and Badore-1) in the lower Eocene–upper Oligocene periods of the Dahomey Basin, southwestern Nigeria. The lithostratigraphic analysis revealed...
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| Format: | Article |
| Language: | English |
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W. Szafer Institute of Botany, Polish Academy of Sciences
2022-12-01
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| Series: | Acta Palaeobotanica |
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| Online Access: | https://acpa.botany.pl/Graphic-correlation-and-paleoenvironmental-investigation-of-the-upper-Eocene-lower,153526,0,2.html |
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| author | Moshood Adegboyega Olayiwola Ernest Uzodimma Durugbo Olugbenga Temitope Fajemila |
| author_facet | Moshood Adegboyega Olayiwola Ernest Uzodimma Durugbo Olugbenga Temitope Fajemila |
| author_sort | Moshood Adegboyega Olayiwola |
| collection | DOAJ |
| description | This study presents the results of a comprehensive qualitative and quantitative palynological analysis
of four shallow boreholes (Epe-1, Olokonla-1, Ikoyi-1 and Badore-1) in the lower Eocene–upper Oligocene periods of
the Dahomey Basin, southwestern Nigeria. The lithostratigraphic analysis revealed three lithologies (sandy-shales,
shaly-sands and sandstones). Two most important palynological zones, the Verrucatosporites usmensis , as well as
the Magnastriatites howardi Pan-tropical zones, are delineated. First Appearance Datum (FAD) of Achomosphaera
alcicornu marked the late Eocene–early Oligocene boundaries (E/O) within the four boreholes, while FAD of Adnatosphaeridium
multispinosum defined the late Eocene–early Oligocene boundary (E/O) in Ikoy-1. Two informal
palynological assemblage zones were revealed in the four boreholes. Common occurrences of palms, mangrove,
fresh water and brackish water pollen, and pteridophyte spores with spots records of marine elements and algae
species during marine invasion suggested fluctuation from fluvio-deltaic/nearshore to marginal marine paleoenvironments.
Graphic correlation discloses that for every meter of sedimentary rock accretion within Epe-1, equally
amounted to merely 0.31 m, 0.56 m, as well as 0.47 m of sediments, which were put down in Olokonla-1, Ikoyi-1,
as well as Badore-1, respectively. These comparative rates of sedimentary rock accretion show with the purpose of
either there is fewer attrition occurrence and/or extra accommodation gap within Epe-1 than Olokonla-1, Ikoyi-1,
as well as Badore-1. The assessment of the slopes, intercept and correlation equations through graphic correlation
procedures enable the identification of four biostratigraphic events in Epe-1, Olokonla-1, Ikoyi-1, as well as
Badore-1. The findings in this investigation are necessary for depositional succession and paleoenvironmental
understandings, as well as basin investigation, and above all, to show a relationship of broadly separated boreholes. |
| first_indexed | 2024-04-11T01:19:28Z |
| format | Article |
| id | doaj.art-5ec22b7dc4544dea8aa60413d5d60f2a |
| institution | Directory Open Access Journal |
| issn | 2082-0259 |
| language | English |
| last_indexed | 2024-04-11T01:19:28Z |
| publishDate | 2022-12-01 |
| publisher | W. Szafer Institute of Botany, Polish Academy of Sciences |
| record_format | Article |
| series | Acta Palaeobotanica |
| spelling | doaj.art-5ec22b7dc4544dea8aa60413d5d60f2a2023-01-03T11:32:18ZengW. Szafer Institute of Botany, Polish Academy of SciencesActa Palaeobotanica2082-02592022-12-0162216218110.35535/acpa-2022-0011153526Graphic correlation and paleoenvironmental investigation of the upper Eocene–lower Oligocene sediments in the Dahomey Basin, southwestern Nigeria: insights from palynomorphs.Moshood Adegboyega Olayiwola0Ernest Uzodimma Durugbo1Olugbenga Temitope Fajemila2Natural History Museum, Obafemi Awolowo University, Ile-Ife, NigeriaDepartment of Biological Sciences, Redeemer’s University, P.M.B. 230, Ede, NigeriaDepartment of Geological Sciences, Osun State University, Osogbo, NigeriaThis study presents the results of a comprehensive qualitative and quantitative palynological analysis of four shallow boreholes (Epe-1, Olokonla-1, Ikoyi-1 and Badore-1) in the lower Eocene–upper Oligocene periods of the Dahomey Basin, southwestern Nigeria. The lithostratigraphic analysis revealed three lithologies (sandy-shales, shaly-sands and sandstones). Two most important palynological zones, the Verrucatosporites usmensis , as well as the Magnastriatites howardi Pan-tropical zones, are delineated. First Appearance Datum (FAD) of Achomosphaera alcicornu marked the late Eocene–early Oligocene boundaries (E/O) within the four boreholes, while FAD of Adnatosphaeridium multispinosum defined the late Eocene–early Oligocene boundary (E/O) in Ikoy-1. Two informal palynological assemblage zones were revealed in the four boreholes. Common occurrences of palms, mangrove, fresh water and brackish water pollen, and pteridophyte spores with spots records of marine elements and algae species during marine invasion suggested fluctuation from fluvio-deltaic/nearshore to marginal marine paleoenvironments. Graphic correlation discloses that for every meter of sedimentary rock accretion within Epe-1, equally amounted to merely 0.31 m, 0.56 m, as well as 0.47 m of sediments, which were put down in Olokonla-1, Ikoyi-1, as well as Badore-1, respectively. These comparative rates of sedimentary rock accretion show with the purpose of either there is fewer attrition occurrence and/or extra accommodation gap within Epe-1 than Olokonla-1, Ikoyi-1, as well as Badore-1. The assessment of the slopes, intercept and correlation equations through graphic correlation procedures enable the identification of four biostratigraphic events in Epe-1, Olokonla-1, Ikoyi-1, as well as Badore-1. The findings in this investigation are necessary for depositional succession and paleoenvironmental understandings, as well as basin investigation, and above all, to show a relationship of broadly separated boreholes.https://acpa.botany.pl/Graphic-correlation-and-paleoenvironmental-investigation-of-the-upper-Eocene-lower,153526,0,2.htmlpalynologystratigraphygraphic correlationdepositional environmenteocene–oligocene boundarydahomeybasin |
| spellingShingle | Moshood Adegboyega Olayiwola Ernest Uzodimma Durugbo Olugbenga Temitope Fajemila Graphic correlation and paleoenvironmental investigation of the upper Eocene–lower Oligocene sediments in the Dahomey Basin, southwestern Nigeria: insights from palynomorphs. Acta Palaeobotanica palynology stratigraphy graphic correlation depositional environment eocene–oligocene boundary dahomey basin |
| title | Graphic correlation and paleoenvironmental investigation of the upper Eocene–lower Oligocene sediments in the Dahomey Basin, southwestern Nigeria: insights from palynomorphs. |
| title_full | Graphic correlation and paleoenvironmental investigation of the upper Eocene–lower Oligocene sediments in the Dahomey Basin, southwestern Nigeria: insights from palynomorphs. |
| title_fullStr | Graphic correlation and paleoenvironmental investigation of the upper Eocene–lower Oligocene sediments in the Dahomey Basin, southwestern Nigeria: insights from palynomorphs. |
| title_full_unstemmed | Graphic correlation and paleoenvironmental investigation of the upper Eocene–lower Oligocene sediments in the Dahomey Basin, southwestern Nigeria: insights from palynomorphs. |
| title_short | Graphic correlation and paleoenvironmental investigation of the upper Eocene–lower Oligocene sediments in the Dahomey Basin, southwestern Nigeria: insights from palynomorphs. |
| title_sort | graphic correlation and paleoenvironmental investigation of the upper eocene lower oligocene sediments in the dahomey basin southwestern nigeria insights from palynomorphs |
| topic | palynology stratigraphy graphic correlation depositional environment eocene–oligocene boundary dahomey basin |
| url | https://acpa.botany.pl/Graphic-correlation-and-paleoenvironmental-investigation-of-the-upper-Eocene-lower,153526,0,2.html |
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