Dispersal Patterns of the Late Cretaceous to Early-Tertiary Sediments in the Southern Anambra Basin, Southeastern Nigeria

Onyekuru, Samuel Okechukwu; Iwuagwu, Chukwuma Julian; Nwankwor, G. I.; Onu, Nathaniel N.; Ukaonu, Cyril E.

doi:10.4236/ijg.2013.43054

Cited by 5 publications

(6 citation statements)

References 7 publications

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“…The Anambra Basin is a structural depression located southwest of the Benue Trough and the immediate precursor to the Niger Delta. The basin is exposed over a roughly triangular territory, estimated at some 95,000 km 2 [1] and separated from the Dahomey Basin by a Basement high-the Okitipupa Ridge and the Abakiliki Anticlinorium to the west and east, respectively. Its demarcation from the Bida Basin to the northwest is less clear and arbitrarily placed.…”

Section: Introductionmentioning

confidence: 99%

“…Its demarcation from the Bida Basin to the northwest is less clear and arbitrarily placed. The northeastern and southern boundaries of the basin bordering some parts of Benue Trough and the Niger Delta are still not very clear due to stacking of the basins [2]. There had, however, been strong tendencies in the past to merge the Anambra Basin with the Niger Delta Basin as one extensive coastal basin, or simply to consider one an extension of the other [3] [4].…”

Section: Introductionmentioning

confidence: 99%

“…The difficulties associated with the demarcation of Anambra Basin's geographic boundaries from other adjoining Nigerian coastal basins have been linked to the inability of researchers to clearly define the dispersal patterns of the Anambra basin's sedimentary fills [2]. It had been established that the basin consists of post-Santonian sediments, although adjudged to be thinly draped by pre-Santonian sediments [1] and capped by the Danian Sediments.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of the Upper Cretaceous Sediments in the Ikpankwu-Ihube Axis, Okigwe, Southeastern Nigeria

Onyekuru¹,

Iwuagwu²,

Okenyi³

et al. 2019

IJG

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Detailed characterization of the outcropping sediments in the Ikpankwu and Ihube axis was undertaken to validate lithostratigraphic boundaries and nomenclatures which had stirred up debates amongst scholars in recent times. Stochastic method established dominant facies associations and preferred stacking patterns, which were used to interpret environments of deposition (EODs), while foraminiferal and palynological analyses fingerprinted both paleo depths and age of the sediments. The results established the dominance of similar lithofacies at the basal parts of both sections indicating mappable geological units and members of the same lithostratigraphic unit. The basal lithofacies are succeeded up section, however, by different lithological units in both the KM 75 and Ikpankwu sections. Interpretations of EODs using lithofacies successions predicted fluvial to tidally-influenced shallow marine deposits, which are environments in close affinity with each other. Interpretations using abundance and diversity of micro fauna supported non-marine (coastal-deltaic) to middle neritic paleo-water depths also, typical of marginal to shallow marine EODs. Recovered foraminiferal assemblages in the shale samples from the upper parts of both sections, however, depicted deposits of Nsukka Formation despite variations observed in lithofacies assemblages because the identified Haplophragmoides species that populate the upper units had been used to define the Late Maastrichtian-Paleocene age. Sediments at the basal parts with mappable lithological units at both sections were rather populated by species that connote the Campanian-Maastrichtian age when the Mamu Formation sediments were deposited. Palynomorphs recovered from both the basal and upper sections also suggested Campanian-Maastrichtian and Late Maastrichtian-Paleocene age, indicative of Mamu and Nsukka Formation sediments, respectively.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of the Upper Cretaceous Sediments in the Ikpankwu-Ihube Axis, Okigwe, Southeastern Nigeria

Onyekuru¹,

Iwuagwu²,

Okenyi³

et al. 2019

IJG

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“…The geologic histories of both the Afikpo and Anambra Basins are thus related. Andlike the Anambra Basin the dispersal patterns, provenance and geographic extent of theAfikpo Basin have not been clearly ascertained (Onyekuru et al, 2013). Therefore, astudy synthesizing data accruing from lithofacies, sedimentary structures and petrologyand paleocurrent trend to infer the paleoenvironment, source model and paleogeographyof the lithostratigraphic units in the basin would aid in delineating spatial faciesrelationships and possible lithostratigraphic units" boundaries, thus enhancingcorrelation.…”

Section: Introductionmentioning

confidence: 99%

Paleoenvironment and Provenance Studies of Ajali Sandstone in Igbere Area, Afikpo Basin, Nigeria

Onyekuru¹,

Okoro²,

Opara³

et al. 2017

THE IJES

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“…Resistivity generally increases as porosity decreases and vice versa. Several authors have therefore delineated shallow aquifers and estimated aquifer hydraulic parameters using surface geophysical methods in different parts of the world [2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Delineation of Shallow Aquifers of Umuahia and Environs, Imo River Basin, Nigeria, Using Geo-Sounding Data

Ugada¹,

Opara²,

Emberga³

et al. 2013

JWARP

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This work was undertaken to study the hydrogeophysical characteristics of Umuahia and environs, Imo River Basin using geophysical data. Thirty (30) vertical electrical sounding data with a maximum electrode spacing of (AB/2) of 500 meters were acquired using the Schlumberger electrode configuration. The VES data were interpreted using the conventional partial curve matching technique to obtain initial model parameters, which were used as input for computer iterative modelling using the OFFIX software. The study revealed three (3) to six (6) geo-electric layers with underlying shale beds. Aquifer apparent resistivity in the study area ranges from about 50 to 850 Ωm with the aquifer depth varying between 0.53 -82.67 m. Similarly, the aquifer thickness in the study area ranges from 0.8 -110 m, with very low thicknesses around Ajata Ibeku. These shallow aquifers with very small thicknesses in the western areas around Ajata Ibeku are believed to be perched or fractured shale units with very low or no yield. Finally, transverse resistances in the study area range from 200 -3400 Ωm 2 with low values in the western part. Information extracted from iso-resistivity models, geoelectric cross sections, litho logs and electric logs revealed a sandy clay lithology at very shallow depths with a thick layer of shale/clay extending to over 300 m within the western part. These shallow aquiferous units are however perched, partially saturated and may not have sufficient yield. Finally, this study has helped to delineate the aquifers of the study into two distinct zones, thus revealing a groundwater divide.

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Dispersal Patterns of the Late Cretaceous to Early-Tertiary Sediments in the Southern Anambra Basin, Southeastern Nigeria

Cited by 5 publications

References 7 publications

Characterization of the Upper Cretaceous Sediments in the Ikpankwu-Ihube Axis, Okigwe, Southeastern Nigeria

Characterization of the Upper Cretaceous Sediments in the Ikpankwu-Ihube Axis, Okigwe, Southeastern Nigeria

Paleoenvironment and Provenance Studies of Ajali Sandstone in Igbere Area, Afikpo Basin, Nigeria

Delineation of Shallow Aquifers of Umuahia and Environs, Imo River Basin, Nigeria, Using Geo-Sounding Data

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