Department of Geological Sciences http://repository.unizik.edu.ng/handle/123456789/85 2026-04-04T04:22:00Z 2026-04-04T04:22:00Z *Onuigbo, Evangeline ,N. Okoro, Anthony U Obiadi, Ignatus, I. Akpunonu, Eliseus O Okeke, Harold C. Maduewesi, Victor U. http://repository.unizik.edu.ng/handle/123456789/1153 2025-07-21T10:59:06Z 2016-01-01T00:00:00Z

Title: Tide-generated Sedimentary Structures, Lithofacies and Particle Size Distribution: Proxies to the depositional setting of the Ajali Sandstone in the Anambra Basin, Southeastern Nigeria. Authors: *Onuigbo, Evangeline ,N.; Okoro, Anthony U; Obiadi, Ignatus, I.; Akpunonu, Eliseus O; Okeke, Harold C.; Maduewesi, Victor U. Abstract: Herringbone cross stratification, mud draped foresets, reactivation surfaces, tidal bundles, flaser beddings, ripple and horizontal laminations were identified on the Ajali Sandstone studied. The biogenic structures occur as dominantly vertical to sub-vertical and u -tubed burrows of the Skolithos ichnofacies commonly Skolithos verticalis and Ophiomorpha nodosa. Occasional Thalassinoides and Teichichnus isp burrows of the Cruziana Ichnofacies also occur. Three lithofacies were identified and these include; the medium to coarse grained cross bedded sandstone lithofacies, Fine grained cross bedded sandstone lithofacies and the mudstone lithofacies. The paleocurrent pattern from cross bed azimuths shows a bimodal – bipolar pattern indicative of tidal process. The grain size frequency histograms indicate both unimodal and bimodal asymmetrical patterns with shifting modes. The cumulative frequency curves suggest traction, saltation and suspension as the mechanisms of the sediment transport. The bivariate plots of the discriminant functions (Y1, Y2 and Y3) for the sands suggest deposition in a shallow agitated marine environment. Intertidal to subtidal shallow marine depositional setting is proposed for the Ajali Sandstone. Description: Scholary work

2016-01-01T00:00:00Z Oghuma, A .A Obiadi, I. I Obiadi, C. M http://repository.unizik.edu.ng/handle/123456789/1151 2025-07-21T10:47:28Z 2015-01-01T00:00:00Z

Title: 2-D Spectral Analysis of Aeromagnetic Anomalies over Parts of Monguno and Environs, Northeastern Nigeria Authors: Oghuma, A .A; Obiadi, I. I; Obiadi, C. M Abstract: 2-D Spectral Analysis of aeromagnetic anomalies over parts of Monguno and environs, northeastern Nigeria was carried out to determine the depth to basement, establish the basement topography and determine the temperature at depths in the area. Data enhancement was carried out to delineate residual features and the more intense anomalies relative to the strong regional gradients. Typical techniques applied were computations of reduction to pole, trend surface analysis, and a number of filtering processes. Results of the 2-D spectral analysis of the aeromagnetic data revealed a two depth source model. The depth to the deeper magnetic source bodies ranges from 1.22 to 3.14 km, with an average depth of 2.341 km. This layer may be attributed to magnetic rocks of the basement, lateral variations in basement susceptibilities and intra- basement features like faults and fractures. The shallower magnetic sources range in depth from 0.12 to 0.93 km, with an average depth of 0.572 km and could be attributed to near surface magnetic sources, which are magnetic rocks that intruded into the sedimentary formations. Based on the computed average sediment thickness obtained in this study together with the temperature at depths in the area, some parts of the study area have been demarcated for detail hydrocarbon exploration in-line with the renewed interest in hydrocarbon exploration in the basin Description: Scholarly work

2015-01-01T00:00:00Z Okolo ·, C. M. · · Akudinobi, B. E. B. Obiadi, I. I. http://repository.unizik.edu.ng/handle/123456789/1115 2025-07-16T10:55:27Z 2020-01-01T00:00:00Z

Title: Evaluation of water resources of some satellite towns in the central part of Anambra State, SE, Nigeria Authors: Okolo ·, C. M. · ·; Akudinobi, B. E. B.; Obiadi, I. I. Abstract: Water, an integral part of human life should regularly be assessed to ensure the desired quantity and quality. No aspect of the living organism and industrialisation can be sustained without water. The satellite towns of Ebenebe, Ugbene, Urum, Isuaniocha and Mgbakwu are located very close to Awka the capital of Anambra State, SE, Nigeria. This study is geared toward assessing the suitability of the water sources in these towns for domestic, agricultural and industrial uses. Fifteen water samples were collected from both surface water and groundwater sources. The samples were subjected to chemical and microbial analyses. The result of chemical analysis indicates that the water sources are slightly acidic. The major ions are within the WHO desirable limit. There is, however, enrichment of heavy metals such as mercury, chromium, cadmium, and iron. These heavy metals have serious negative health implications. The biological analysis result indicates the presence of the coliform group of bacteria and the presence of fecal coliform. These denote the presence of biological pollution. The WQI values depict water that ranged from unsuitable to excellent. Also, the Heavy Metal Pollution Index indicates water that range from very poor to very good. The results obtained show that some of the water sources are polluted. Also, the %Na status is from good to excellent and SAR suggests water that is excellent for agriculture. Calcium and sulphate are the dominant ions. The major water types are Ca2+–Mg2+–Cl−–SO42− and Ca2+–Mg2+–HCO3− suggesting water that has undergone mixing. In 93.3% of the samples, the alkaline earths exceed the alkalis while strong acids exceed weak acids in 73.3% of the samples. The chloro-alkaline indices were positive indicating reverseion exchange. Hence, the dominant hydrochemical process is reverse ion exchange. Description: Scholar work

2020-01-01T00:00:00Z EZIM, EMMANUEL O. OBIADI, IZUCHUKWU I AKAEGBOBI, MIKE I. http://repository.unizik.edu.ng/handle/123456789/1114 2025-07-11T14:18:09Z 2017-01-01T00:00:00Z

Title: THE USE OF STATISTICAL GRAIN-SIZE METHOD IN ANALYSING BOREHOLE AND EVALUATING AQUIFER PARAMETERS. A CASE STUDY OF AJALI SANDSTONE FORMATION, SOUTHEASTERN NIGERIA Authors: EZIM, EMMANUEL O.; OBIADI, IZUCHUKWU I; AKAEGBOBI, MIKE I. Abstract: Several challenges abound with the accurate estimation of aquifer parameters in Groundwater resource development. This paper describes the investigation on the aquifer (mainly Ajali Sandstone Formation) parameters in Nsukka area. The Ajali Sandstone Formation is among the principal sources of groundwater in the area. The investigated area lies within Longitudes 7o 2213011E and 7o 5813011E, and Latitude 6o 7313011N and 7o 0010011N, covering an area of about 482 square kilometres. Sixty (60) cuttings from nine (9) boreholes drilled in the area were analysed texturally using statistical grain size method. Results show that the highly permeable members of Ajali Sandstone are devoid of surface waters and are seen to be friable, medium-grained, poorly sorted, and highly cross-bedded. Recharge is mainly through rainfall. The distribution of major geological units, well log data, static water level data, and surface features were found to have influenced groundwater occurrence and flow pattern in the study area. The lithological logs showed sandy aquifers separated by clayey aquitards, while stratigraphic analyses of well lithological logs revealed the presence of at least four layers of contrasting hydraulic conductivity, making the aquiferous Ajali Sandstone homogenous and anisotropic. Values of permeability (k) from 0.00753 to 0.01512 cm2, hydraulic conductivity (K) from 8.2886 to 16.6444 m/s, transmissivity (T) between 455.87 and 1002.48m2s-1 and specific yield from 2.35 to 4.76m3 were found to be consistently high, thus suggesting thick and prolific aquiferous zones. Description: Scholarly work

2017-01-01T00:00:00Z