A paleogeographic model for the sandstone members of the Imo Shale, south-eastern Nigeria

Ekwenye, O.C.; Nichols, Gary; Collinson, M. E.; Nwajide, C.S.; Obi, G.C.

doi:10.1016/j.jafrearsci.2014.01.007

Cited by 22 publications

(9 citation statements)

References 30 publications

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“…The Ameki Formation is estimated to range from 1200 – 1500 m thick, and comprises mainly of sands, minor silt with thin shelly limestone and calcareous clay intercalations ( Reyment, 1965 ; Arua, 1986 ; Nwajide, 2013 ). The Nanka Formation is estimated at 305 m thickness, is mainly sands and minor calcareous clay/mud with heterolith ( Nwajide, 1980 , 2013 ; Ekwenye et al., 2014 ). The Nsugbe Formation is predominantly sands with some conglomerate bands, estimated to be about 100 m thick ( Nwajide, 2013 ).…”

Section: Geologic Settingmentioning

confidence: 99%

“…Eastern Nigerian Oban Massif is also an important source for the Cenozoic sediments of the Niger Delta Basin ( Ekwenye, 2015 ). The Ameki Group (Ameki, Nanka and Nsugbe Formations) sediments were laid down in an estuarine, tidal, barrier ridge-lagoon complex and open marine systems, after the major Paleocene marine transgression of the second depositional cycle at the site of the rift triple junction ( Short and Stauble, 1967 ; Nwajide, 2013 ; Ekwenye, 2014 ). The sediments were deposited under semi-humid to humid paleoclimatic conditions ( Ekwenye et al., 2015 ).…”

Section: Geologic Settingmentioning

confidence: 99%

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Depositional facies, sequence stratigraphy and reservoir potential of the Eocene Nanka Formation of the Ameki Group in Agu-Awka and Umunya, southeast Nigeria

Ogbe

Osokpor

2021

Heliyon

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Section: Geologic Settingmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

Depositional facies, sequence stratigraphy and reservoir potential of the Eocene Nanka Formation of the Ameki Group in Agu-Awka and Umunya, southeast Nigeria

Ogbe

Osokpor

2021

Heliyon

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“…It contains an important amount of organic matter and may be a good source for hydrocarbon within the northern part of the Niger delta. The authors [21,22] gave the age of the Imo Formation to be of Paleocene and its depositional environment to be mainly marine with littoral to neritic environments.…”

Section: Imo Shalementioning

confidence: 99%

Geology and Geochemical Assessment of Maastrichtian Coal Quality in Abocho area, Northern Anambra Basin, Nigeria

Zakari

Jatau

2021

JGEESI

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Detailed geologic mapping and geochemical analysis of coal samples around Abocho area, northern Anambra Basin, Nigeria was conducted in order to assess the quality of the coals in the area. Proximate and ultimate analyses were carried out on coal samples from the Mamu Formation to determine its chemical characteristics. Physical analysis was also carried out on the coal samples to determine the specific gravity, density and hardness. Geochemical analysis was also carried out on the associated rocks in the study area (Abocho), particularly Shales and Clays to determine their major oxides composition. The area is composed of the Maastrichtian Mamu Formation overlain by the Ajali Sandstone of the same age both dipping between 16°E and 19°E. The geologic mapping of Abocho area revealed two mappable lithologic units: The Mamu Formation and the Ajali Sandstone. The Proximate analyses indicates that the coal contains an average 7.15%, 35.53%, 36.24% of moisture content, volatile matter and fixed carbon respectively. These burns to generate 4,339 kcal/kg calorific value with 20.80% ash yield. The result of the ultimate analysis shows 57.81% organic carbon, 4.15% hydrogen, 8.41% oxygen, 1.39% nitrogen and 0.3% Sulphur. The physical analysis revealed that, the coal has an average specific gravity of 1.5g/cm, average density of 1.4g/cm3 and average hardness of 1.2. These characteristics qualify the coal to be ranked as high volatile sub-bituminous to marginal lignite. The coal is thus, suitable for combustion, gasification, electric power generation and industrial uses. Geochemical results show that the Shale contains 60% Silica (SiO2) and 26%Alumina (Al2O3) constituting 86% of bulk chemical composition. The Clay contains 70% Silica (SiO2) and 25% Alumina (Al2O3), constituting 95% of bulk chemical composition. The occurrences of CaO, NaO and K2O which are the major component of feldspar in clay suggests the clay to be of granitic origin possibly from Oban massif, east of the Anambra Basin. It also suggests low feldspar content.

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“…The Imo Formation, popularly known as the Imo Shale, is comprised of blue-grey clays and shales and black shales with bands of calcareous sandstone, marl, and limestone [74][75][76][77] . Ostracode and foraminiferal biostratigraphy, and microfauna recovered from the basal limestone unit indicate a Paleocene age for the formation [78] .…”

Section: The Imo Shalementioning

confidence: 99%

Reassessing Groundwater Potentials and Subsurface water Hydrochemistry in a Tropical Anambra Basin, Southeastern Nigeria

et al. 2020

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This review presented a detailed re-assessment of the hydrogeology and hydrochemistry of the Tropical Anambra Basin. It identified and discussed the major geological formations and their groundwater potentials. The geological examination showed that the Ajali Formation is confined in places forming an artesian condition; the potentials of this aquifer decline in the western basin due to a decrease in thickness. The sandstone associates of the Nsukka Formation are aquiferous and have produced high-pressure artesian boreholes along the Oji River. The Imo Shale is characterized by permeability stability all over much of the intermediate unit. The Bende-Ameki aquifer has a lesser amount of groundwater when equated to other formations; the geologic characteristics do not produce favorable hydrogeological conditions for groundwater occurrence. The stratigraphical and structural framework suggested the presence of an efficient throughflow in the basin. Based on physical and chemical parameters of water quality, the basin holds water of acceptable quality. While there are considerable investigations on the hydrogeology and hydrochemistry, studies are short of analysis of the hydrogeochemical evolution of groundwater, water quality index, heavy metals pollution index as well as total hazard quotient. Suitability of groundwater based on agricultural water quality indices (e.g. SAR) is also salient. Therefore, future studies should address these owing to increasing dependence on groundwater.

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A paleogeographic model for the sandstone members of the Imo Shale, south-eastern Nigeria

Cited by 22 publications

References 30 publications

Depositional facies, sequence stratigraphy and reservoir potential of the Eocene Nanka Formation of the Ameki Group in Agu-Awka and Umunya, southeast Nigeria

Depositional facies, sequence stratigraphy and reservoir potential of the Eocene Nanka Formation of the Ameki Group in Agu-Awka and Umunya, southeast Nigeria

Geology and Geochemical Assessment of Maastrichtian Coal Quality in Abocho area, Northern Anambra Basin, Nigeria

Reassessing Groundwater Potentials and Subsurface water Hydrochemistry in a Tropical Anambra Basin, Southeastern Nigeria

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