Browsing by Author "Tanko, I.Y."

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    ASSESSMENT OF GROUNDWATER POTENTIAL OF RISHA PART OF AKWANGA SHEET 209NE, NORTH CENTRAL NIGERIA
    (Department of Geology and Mining, Nasarawa State University Keffi, 2020-07-01) Tukura, Bitrus Wokhe; Jatau, B.S.; Yakubu, M.E.; Tanko, I.Y.; Kana, A.I.; Ayanninuola, O.S.
    A geological traverse was undertaken in Risha, part of Akwanga Sheet 209NE North-Central Nigeria to appraise the rock types and their structural patterns that might enhance prospect for water. Three rock types; schistose-gneiss, granite-gneiss and pegmatite, with their main structural pattern were discovered, trending mostly NW-SE. Analysis of twenty-three Vertical Electrical Resistivity Soundings (VES) carried out in the area using the Campus Ohmega digital resistivity meter showed that the field curves were of H, KH, HK, A and K types. There were majorly four to five geoelectrical layers consisting of topsoil (sand/clay) with depth range of 0.3-2.4m and resistivity value of 66-2850Ωm. The second layer is lateritic clay with depth range of 0.4-5.7m and resistivity range of 222- 3575Ωm. The third layer had a depth range of 1.2-8.6m with resistivity of 40-4591Ωm, while the fourth layer, weathered rocks or regolith, has a depth range of 3-33m and resistivity range of 49-23668Ωm. Two locations gave six lithological layers/units being partially fractured/fresh basement with resistivity values of 1028-4574Ωm and depth range of 11.4- 24m. The water potential of the area may be classified as poor, moderate, good and very good and varied from location to location. The groundwater potential area varies with high potential around Risha, Tidde and Ridam compared to Ade-Katako, Ngazzu,AngwanDorowa, Ngakide and Adande. Based on the textures, structural pattern and well measurement interpretations, the granite gneiss was observed to have more water prospectivity than the schistose gneiss.
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    Comparative Ternary Imaging of Rock and Stream sediments Investigations at Ragga and its Environs part of Kurra Sheet 189 SW North-Central Nigeria
    (Department of Geology and Mining, Nasarawa State University Keffi, 2021-02-09) Jatau, B.S.; Tukura, B.W.; Oleka, A.B.; Oloniniyi, L.T.; Tanko, I.Y.
    Twenty-nine (29) stream sediments were obtained with four (4) control point samples and sixteen (16) rock samples were collected in the field at Ragga and its Environs, North Central-Nigeria. The basement complex consists of banded gneiss, biotite gneiss (leucocratic and melanocratic), pegmatites, basalt and amphibolite and were analysed for rare and trace metals composition using XRF. The quantitative results were then used to generate the qualitative interpretation of the earlier work using ternary imaging. Ternary images were plotted for both the stream sediments and rock samples using the three grid channels from Oasis Montaj, which includes; the gold (Au), tin (Sn) and tantalum (Ta). Three apexes were used to depict compositions of gold, tin and tantalum. This allows comparison between gold (Au), tin (Sn) and tantalum (Ta) at once, every position or point on the ternary plot represents a different composition of the three elements in the study area. Ternary image for the relative abundance of gold (Au), silver (Ag) and tin (Sn) shows that tin is dominants in the sediments along the streams in the north-western part of Ungwan Maiganga, whilst silver tend to be more dominant in the sediments along the streams around Ragga Makaranta. Ternary image of the rocks samples for the relative abundance of gold (Au), tin (Sn) and tantalum (Ta) showed that the central part of the study area is relatively rich in tin. Gold is not prominent in the map and where it is seen the concentration is low (especially around Dutse Tudu). Tantalum is fairly seen in the northwestern of the area. The concentration of metals like Au, Ag, Pb, Zr, Sn and Ba are relatively low in the rock samples but higher in the stream sediments significant to warrant further investigation. The correlation of the topographic and the ternary Imaging maps shows the relative distribution of the trace elements (minerals) in the stream sediments indicating that areas with low elevation (topographic or basement lows) generally have high concentration of the rare metals, whilst areas with high elevation (topographic or basement highs) tend to have relatively low concentration of the rare elements. Mineralization in the study area tends to be concentrated in the north-western part of Ungwan Maiganga and around Ragga Makaranta that warrant further detail investigation.
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    Heavy Metal Distribution in Soil and Stream Sediment in Villages around Udegi Mbeki Mining District.
    (Department of Geology and Mining, Nasarawa State University Keffi, 2019-11-20) Tanko, I.Y.; Jatau, B.S.; Baba, Adama Oleka; Kidze, K.L.
    The Udegi Mbeki mining district a typical environment characterized by unorganized small-scale mining is a rugged terrain due to the Afu Ring complex intrusion and characterized by indiscriminate disposal of the mining waste which are likely to constitute environmental problems. This study is aimed at determining the extent of distribution and concentre ifon of some heavy metals (Pb, Zn Cu, Cd, As, Cr, Sn, Nb), pH and Electrical conduct. (EC) in soil and stream sediments of some surrounding villages (Garin ehu, . isa and Jenta). Fifteen samples (10 soil and 5 stream sediments) were o. ecte- Rested and analyzed using atomic absorption spectrophotometer (AAS). The in sice v omical results show that pH is generally acidic which range (4.5-6.7) for both so.; and or sam sediment and Electical conductivity are also low for the two-sample media c.. d ranged between (40.24-70.55) ps/cm. The results of heavy metal analysis for soil samples shows that the trend of mean concentration as: Nb (14.8693) >Sn (10.4619)>Cd (0.1873)>As (0.08019) > Cu (0.0493) >Zn (0.03284) >Pb (0.0224) >Cr (0.00559) in (mg/l). Also, Nb, Sn, Cd and As have mean concentrations higher than the local background values. Whilst for stream sediments mean trend of heavy metals indicates that: Nb (8.99970) >Sn (0.8854)> Cd (0.2656) > Zn (0.1928) > Cu (0.1518)> Cr (0.03758) > Pb (0.0224) > As (0.01566) in (mg/l). Similarly, Nb, Sn, Cd and As in stream sediment were higher than the local background concentration from upstream sediments free of mining activities in the area. These results suggest that the soil and stream sediments around Garin Shehu, Agasa and Jenta villages in Udegi Mbeki mining district are contaminated with Nb, Sn, Cd and As due to many years of random dumping of waste from the mining and processing activities in the area. Furthermore, anthropogenic sources may as well have contributed to the high concentrations.
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    HYDROGEOPHYSICAL APPRAISAL OF RISHA, PART OF AKWANGA SHEET 209NE, NORTH CENTRAL NIGERIA
    (Department of Geology and Mining, Nasarawa State University Keffi, 2017-11-18) Jatau, B.S.; Tanko, I.Y.; Usman, O.H.; Yakubu, M.E.; Ayanninuola, O.S.
    Ageological traverse was undertaken in Risha, part of Akwanga Sheet 209NE North-Central Nigeria to appraise the rock types and their structural patterns that might enhance prospect for water. The geological traversing revealed basically three rock types which include schistose-gneiss, granite-gneiss and pegmatite (as veins and/or dykes) with their main structural pattern trending mostly NW-SE. Twenty three (23) Vertical Electrical Resistivity Soundings (VES) were carried out in the area using the Campus 0? .vega digital resistivity meter. This is in order to study the subsurface geological layers with a view to deterrrT
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    Kwoi 2016 Multiple Tremors: An Emerging Geotourism Phenomenon
    (Department of Geology and Minning, Nasarawa State University Keffi, 2017-01-01) Goki, N.G.; Baba, Adama Oleka; Iyakwari, Shekwoyandu; Tanko, I.Y.; Kana, A.A.; Umbugadu, A.A.; Usman, Halima Osu
    For a stretch of three days, the residents of Kwoi, Central Nigeria were held hostage by what is now accepted as an earth tremor of magnitudes ranging between 2.9 and 3.1. In its initial stages, various versions of interpretations were given including religious and traditional myths. These triggered national and international attention making the area to be temporarily a tourist’s attraction of some sorts with different groups visiting and reporting different versions. The aim of this paper is to report first hand the occurrence of systematic cracks on rocks and buildings as well as the safety aspects associated with this tremor. The study confirms that this is a purely geoscientific phenomena triggered by deep seated tectonic movements manifested on the surface through short distance travel of the accompanying vibrations which lead to collapse and breakage of buildings. It is unpredictably episodic but relatively safe for tourists as an intra-cratonic tremor.
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    PETROGRAPHY, GEOCHEMISTRY AND MINERALISATION POTENTIAL OF THE PEGMATITES OF JANJALA AREA, NORTH CENTRAL NIGERIA
    (Department of Geology and Mining, Nasarawa State University Keffi, 2020-07-20) Tanko, I.Y.; Jatau, B.S.; Usman, Halima Osu
    The petrographic, geochemical and mineralogical investigations of the pegmatites of Janjala area, North Central Nigeria was carried out with the aim of understanding its mineralization potential. Petrographic studies were conducted in the petrographic laboratory of the Department of Geology and Mining Nasarawa State University Keffi, while the geochemical analysis was carried out using Inductively Coupled Plasma Mass Spectrometry (ICP-MS) techniques in the ACME laboratory limited, Vancouver Canada and NGSA laboratory Kaduna, Nigeria using XRF techniques. The seven (7) lithological units identified in the area consist of the biotite schist, muscovite schist, fine grained muscovite granite, medium grained biotite granite, medium grained granite, porphyritic granite and pegmatites. All the pegmatites are uncomformably emplaced and restricted to the biotite schist unit in the area around Janjala and Mahanga villages. Petrographic studies reveal the major mineral as quartz, K-feldspar, plagioclase, muscovite; while accessory minerals comprise of lepidolite, beryl, clevelandite, sericite, sphene, tourmaline and zircon. Major oxides and trace element contents indicate high fractionation and mineralization potential based on the variation plot of K2O vs Na2O, the relatively high values of Rb, Cs,Ta, Sn Nb, the K/Rb vs Rb and K/Rb vs Cs ratios which revealed that the pegmatites are relatively mineralized. Generally, the pegmatites in the Janjala area favourably compared well with other relatively mineralized rare-metal pegmatites of the North Central Nigeria, such as Wamba, Nasarawa and Keffi pegmatites.
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    Preliminary Studies of Structures Controlling the Flow of Brine in the Awe Brine Field
    (Department of Geology and Minning, Nasarawa State University Keffi, 2019-01-05) Usman, Halima Osu; Usman, Halima Osu; Tanko, I.Y.; Obaje, N.G.
    Studies of the Awe brine field in the middle Benue Trough have revealed interesting structural features deserving a considerable attention. Some interesting field evidence points to the probability of the occurrence of dome structures in the brine bearing sediments. This brine field is underlain by Formations of Cretaceous age (Asu River Group, Awe, Keana and Ezeaku Formations). The tectonic set up in this brine field is * dominated by the Keana anticlinorium and brine is seen to issue from flanks of the transitional beds of the Awe Formation which have been exposed by erosion.ln Old Awe town, structural features mapped revealed dips of up to 14° to 30° to the north and south. Usually, close conjugate joint systems, infilled by silica revealed the same pattern as the major fold axis, thus contribute to the flow of brine in the field.