Sedimentological Characteristics and Geochemistry of Ajali Sandstone Exposed at Ofe-Jiji and Environs, Northern Anambra Basin, Nigeria

Gideon, Yomi B.; Fatoye, Felix Bamidele; Omada, Joseph I.

doi:10.19026/rjees.6.5735

Cited by 7 publications

(5 citation statements)

References 8 publications

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“…The sandstone at Auchi (Tables ' 1-2) are medium grained, moderately sorted strongly fine skewed, mesokurtic to leptokurtic. This findings agree with published data (Hoque (1977), Akpofure and Etu-Efeotor ( 2013), Gideon et al (2014), Odumoso et al (2015).…”

Section: Textural Analysissupporting

confidence: 93%

“…Previous studies have provided contradictory descriptions of the Ajali Formation sands. Whereas Hoque (1977), Akpofure and Etu-Efeotor (2013), Gideon et al (2014), Odumoso et al (2015), reported fine to coarse grained, moderately to poorly sorted, subangular to subrounded grain textures. Amajor (1987) described the Ajali sandstone as predominantly sub-rounded to wellrounded with fairly good sorting.…”

Section: Geologic Overviewmentioning

confidence: 98%

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Sedimentology and maturity of Ajali formation, Benin flank Anambra basin, Nigeria

Ilevbare¹,

Imasuen²

2020

ijs

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The Ajali Sandstone, western flank, Anambra Basin, was studied for textural characteristics and maturity of the sediments. Grain size analysis (51 samples), thin section and heavy mineral analysis (15 samples each) and XRF fusion for metallic oxides (15 samples) were analyzed. The textural parameters show that the Ajali Sandstone are medium sand, poorly to moderately sorted, coarse to strongly coarse skewed with mesokurtic to leptokurtic grains. The thin section analysis reveals grains that are sub-angular to sub-rounded (this typifies grains that have travelled fairly long distance to the deposition site), of moderate to well sorted grains, with both monocrystalline and polycrystalline quarts-grains type, with a modal composition of Q F and L . A mineralogical maturity 90.4, 2.3 2.9 index (MMI) of 17.04, SiO /Al O ratio of 180.24, and a ZTR index of 67.96% were obtained. The values for the 2 2 3 MMI and SiO /Al O indicates mineralogical matured sediments, the ZTR index shows a chemically immature 2 2 3 to sub-mature sandstone, and the modal composition values are consistent with a texturally and compositionally matured sands. The mineralogical maturity is indicative of high degree of chemical weathering of source area. Furthermore, the high quartz and silica content make the sandstone prospective for glass and glassware production. Key words: Anambra Basin, Maturity, Mineralogical maturity index, Textural characteristics, Glass

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Section: Textural Analysissupporting

confidence: 93%

Section: Geologic Overviewmentioning

confidence: 98%

Sedimentology and maturity of Ajali formation, Benin flank Anambra basin, Nigeria

Ilevbare¹,

Imasuen²

2020

ijs

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“…It took its root from Ojofu, in Dekina Local Government area in Kogi State flowing in the eastward direction with a catchment area amounting to about 1,604 km 2 most of which is covered by dense forest. Okura River joined Imabolo River in Egabada (Kogi State) and further flow southwards before joining the Ofu River and the 'three-in-one' river empties into the famous Anambra River in Anambra State (Gideon et al, 2013).…”

Section: A the Study Areamentioning

confidence: 99%

Hydrologic and morphometric analysis of Ofu River Sub-Basin using remote sensing and Geographic Information System

Alfa¹,

Ajibike²,

Adie³

et al. 2019

Nig. J. Technol. Dev.

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The morphometric characteristics of a river basin are very important factors in watershed hydrology. The morphometric analysis of the Ofu River sub-basin was carried out in this study to assess its morphologic and hydrological characteristics as well as its flood potentials based on the morphological characteristics. The study was carried out using remotely sensed spatial data analysed using Geographical Information Systems (GIS). The morphometric parameters analysed were the areal, linear, and relief aspects of the sub-basin. The results showed that Ofu river sub-basin covers a total area of 1604.56 km 2 and a perimeter of 556.98 km covering parts of Kogi and Enugu States in Nigeria. The sub-basin has 3rd order river network based on the Strahler's classification with a dendritic drainage pattern and moderate drainage texture. The values of bifurcation ratio, drainage density, circularity ratio, elongation ratio, form factor, stream frequency and drainage intensity indicate that the sub-basin is elongated and would produce a flatter peak of direct runoff for a longer duration implying that the sub-basin is morphometrically less susceptible to flood and that any flood flow that may emanate from it would be easy to manage.

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“…Nkporo Group consists of Nkporo Shale, Oweli Sandstone and Enugu Shale. It is overlain by Mamu Formation which consists of shale, coal and sandy shale while Ajali Formation which overlies Mamu Formation is a thick, friable, poorly sorted white sandstone (Gideon et al 2014;Reyment 1965).…”

Section: Study Area and Data Descriptionmentioning

confidence: 99%

GIS-based estimation of soil erosion rates and identification of critical areas in Anambra sub-basin, Nigeria

Fagbohun

Anifowose

Odeyemi

et al. 2016

Model. Earth Syst. Environ.

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Estimation of soil loss through water erosion is an essential exercise which can help decision makers and planners determine the severity of soil loss through rill and sheet erosion and also curtail the development of further gullies in an area already ravaged by gully erosion. While Universal Soil Loss Equation (USLE) is the most commonly adopted model because it provides a straight forward approach for qualitative estimation of soil loss, however its rainfall erosivity component is found incompetent in most parts of the world. To overcome this deficiency, the Revised Universal Soil Loss Equation (RUSLE) was implemented using rainfall erosivity (R) values peculiar to tropical environment of the Anambra area of Nigeria. Rainfall erosivity (R-factor), soil erodibility (K-factor), slope factor (LS-factor), and cover management (C-factor) were generated in GIS environment and then integrated based on RUSLE equation to estimate the rate of soil erosion. The study indicated that about 1804.39 km 2 (39.49 %) of the study area have slight erosion rate of 0-10 t ha-1 year-1 , while the rates of erosion in 746.60 km 2

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Sedimentological Characteristics and Geochemistry of Ajali Sandstone Exposed at Ofe-Jiji and Environs, Northern Anambra Basin, Nigeria

Cited by 7 publications

References 8 publications

Sedimentology and maturity of Ajali formation, Benin flank Anambra basin, Nigeria

Sedimentology and maturity of Ajali formation, Benin flank Anambra basin, Nigeria

Hydrologic and morphometric analysis of Ofu River Sub-Basin using remote sensing and Geographic Information System

GIS-based estimation of soil erosion rates and identification of critical areas in Anambra sub-basin, Nigeria

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