International Geoinformatics Research And Development Journal, Vol. 5, Issue 4

 Journal

 Application Of GIS In The Mapping Of Petrochemical–Induced Groundwater Contamination From Underground Fuel Storage Tank Leakages In Ile-Ife, Southwestern Nigeria

 Adeoti O. F. , Akinluyi F.O., Isimekhai K.A., Anifowose A.Y.B. And Komolafe A. A.

 2014

Petrochemical-induced groundwater contamination was investigated using an integrated GIS and physico-chemical properties of sampled hand-dug wells close to fuel stations in Ile-Ife, Southwestern Nigeria. This was with a view to evaluating the influence of hydrocarbon spills on groundwater resources within the vicinity of the supposedly leaking underground fuel tanks. Topographic map and IKONOS image of the study area were acquired. Samples from forty-two (42) fuel stations and thirty (30) hand-dug water wells were analyzed for organic compounds such as benzene, ethylbenzene, toluene, xylene, and 1,2,4 trimethylbenzene using gas chromatography and mass spectrometry. Geographic Information System (GIS) tools were employed to examine the spatial relationships between the contaminants and to characterize their levels within the study area. Spatial analysis operations such as spatial interpolation, raster based reclassification, buffering and map overlay were employed. The results obtained were compared with World Health Organization (WHO) standards. Results indicate the presence of benzene in all the water wells with concentrations ranging from 0.004 to 0.09 mg/l; pH, ethylbenzene, toluene, xylene and trimethylbenzene have their highest values at 7.5, 0.074mg/l, 0.031 mg/l, 0.048 mg/l and 0.062 mg/l respectively, while the electrical conductivity varies between 64 and 1538 µS/cm. Contaminations from these petrochemical components were evident throughout the study area; of most significance is the increasing concentration level of benzene and electrical conductivity which exceeded the WHO standard. Obafemi Awolowo University (OAU) Campus, though not host to many fuel stations, appeared to contain moderately high levels of the organic compounds, which can be attributed to the improper disposal of chemicals used in laboratory experiments, and leakages from underground fuel storage tank in the Power House. The study concluded that most of the hand-dug wells close to fuel stations in Ile-Ife, Southwestern Nigeria are contaminated.

 

 Federal University Of Technology, Akure

 Conference

 Geological And Geotechnical Investigations Of Failed Portions Along Ikere/Igbara Odo Road, Southwestern Nigeria.

 Aluko, A.B. And Anifowose, A.Y.B.

 2014

Geological and Geotechnical Investigations of Failed portions along Ikere/Igbara Odo Road, Southwestern Nigeria. In: S.A. Opeloye, A.Y.B. Anifowose, G.M. Olayanju, A. Oluleye, F.O. Akinluyi and R.B. Adesina (Eds.),  Proceedings of the First Annual Conference on Earth and Mineral Sciences, Federal University of Technology, Akure, 29th June-2nd July, 2015, 41-45.

 

 Nil

 Journal

 Investigations Into The Tectonic Faults On Magadi Geothermal Field Using Ground And Aeromagnetic Data

 ANIFOWOSE Adeleye Yekini Biodun

 2013

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 International Journal Of Geophysics, Hindawi

 Journal

 Integrated Remote Sensing And Geophysical Investigations Of The Geodynamic Activities At Lake Magadi, Southern Kenyan Rift

 Komolafe, A.A., Kuria, Z., Woldai, T., Noomen, M. And Anifowose, A.Y.B.

 2012

The tectonic lineaments and thermal structure of Lake Magadi, southern Kenyan rift system, were investigated using ASTER data and geophysical methods. Five N-S faults close to known hot springs were identified for geoelectric ground investigation. Aeromagnetic data were employed to further probe faults at greater depths and determine the Curie-point depth. Results indicate a funnel-shaped fluid-filled (mostly saline hydrothermal) zone with relatively low resistivity values of less than 1 Ω -m, separated by resistive structures to the west and east, to a depth of 75m along the resistivity profiles. There was evidence of saline hydrothermal fluid flow toward the surface through the fault splays. The observed faults extend from the surface to a depth of 7.5 km and are probably the ones that bound the graben laterally. They serve as major conduits for the upward heat flux in the study area. The aeromagnetics spectral analysis also revealed heat source emplacement at a depth of about 12 km. The relative shallowness implies a high geothermal gradient evidenced in the surface manifestations of hot springs along the lake margins. Correlation of the heat source with the hypocenters showed that the seismogenetic zone exists directly above the magmatic intrusion, forming the commencement of geodynamic activities.

 

 Comunicações Geológicas

 Journal

 Emplacement Tectonics Of Idanre Batholith, West Africa.

 Anifowose, A.Y.B. And Kolawole, F.

 2012

Evaluation of the length and orientation of the lineaments within Idanre area indicated that the dominant trend is ENE-WSW (80°– 90°) – oblique to the long-axis of the batholith; while another is at NNWSSE (170°-180°) and NNE-SSW (0°-10°) - parallel to the long-axis of the batholith. The ENE-WSW fractures represent those that developed due to shrinkage within the cooling batholith as the magma rose, while the other group (NNW-SSE and NNE-SSW) represents zones of weaknesses within the country rock at the time of intrusion of the magma. The results showed high density fracturing on the batholith, which is possibly related not only to its depth of emplacement but also to shrinkage effects due to compressive forces acting on the intrusive body at the time of its ascent. Also, the parallelism of some of the fractures with the long-axis of the batholith seems to indicate the influence of pre-existing zones of weaknesses in determining the tectonic grains of the batholith. The intrusion is fault-bounded and its fractures are very deep and they cut the batholith into massive, steep sided and dome-shaped inselbergs. They are conduits through which ore-bearing fluids can be channeled to the surface. It can therefore be concluded that a need for detailed exploration particularly along the fractures is necessary.

 

 Global Journal Of Geological Sciences

 Journal

 A Study Of Basement Fracture Pattern Around Akoko Area Of Southwestern Nigeria For Groundwater Potential Using High-resolution Satellite Imagery And Electrical Resistivity.

 Adesida, A., Anifowose, A.Y.B. And Ojo, J. S.

 2012

to updated soon

 

 Hydrology For Disaster Management Special Publication Of The Nigerian Association Of Hydrological Sciences, 2012

 Conferenceproceeding

 Tectono-Hydrological Study Of Akure Metropolis, Southwestern Nigeria

 A.Y.B. Anifowose And F. Kolawole

 2012

An integrated approach was applied in studying the tectonics and their hydrological implications in Akure metropolis, using remote sensing, structures and secondary geophysical information. Structural geological information was extracted from Landsat ETM+ imagery covering Akure area. Since the study area is densely built-up, a systematic approach was employed in delineating the fractures which are characteristic of the underlying Basement Complex geology. Based on the fact that drainage system on such terrain is structurally controlled, the lineament trends on the few rock outcrops observable on satellite imagery were correlated with the trends of rivers draining the area. Results highlight specific fracture pattern that is most probable for hydrogeological exploration. The influence of tectonism in defining the basement aquifers underlying the study area as well as their implications for hydrological hazards were also underscored.The methodology adopted in this study may be used for hydrogeological exploration in urban areas underlain by Basement rocks in view of the challenge encountered in lineament detection in built-up areas.

 

 Nil

 Journal

 Engineering Geological Assessment Of Some Lateritic Soils In Ibadan, South-Western Nigeria Using Bivariate And Regression Analyse

 Owoseni, J. O., Adeyemi, G. O., Asiwaju-Bello, Y. A., And Anifowose, A.Y.B.

 2012

Bivariate correlation and regression techniques were employed to evaluate the relationship between pairs of geotechnical variables for residual lateritic soils derived from three genetic crystalline rocks in Ibadan metropolis, south-western Nigeria. The significance of mean group differences (parent-rock and level of compactive effort) at 5% level of significance was determined using paired t-test analysis. This is with a view to ascertaining the influence of the pedogenic factor of parent rock, percentage fines, and energy of compaction on engineering index properties of the lateritic soils. The clay-size contents had positive correlations with both Optimum Moisture Content (OMC) and plasticity index, and a negative correlation with the Maximum Dry Density (MDD). The MDD and OMC had significant negative and positive correlations respectively with the amount of fines. The amount of fines and Unconfined Compressive Strength (UCS) had significant negative and positive correlations respectively with the California Bearing Ratio (CBR). The study shows significant parent-rock group differences in most engineering properties. The bandedgneiss-derived soils were found to be better engineering soils than the migmatite-gneiss- and quartzite/quartz- schist-derived soils. The modified AASHTO level of compactive effort which produced better compacted soils than the West African level is recommended for the soils. 

 Ethiopian Journal Of Environmental Studies And Management, Vol. 4, No 3, Pp. 1-6.

 Journal

 Talus Caves: Geotourist Attractions Formed By Spheroidal And Exfoliation Weathering On Akure-Ado Inselbergs, Southwestern Nigeria.

 KOLAWOLE, F. And ANIFOWOSE, A.Y.B.

 2011

Spheroidal weathering of granites in Akure-Ado axis have resulted in the formation of talus caves as well as smooth rock boulders which are dramatically arranged, thereby giving the formation an overall aesthetic value to the observer. Unique talus boulders exist in Akure inselbergs, southern margin of the Ikere-Ado batholith. This paper looks at the uniqueness of these formations as well as their economic potentials for leisure and recreation purposes. Much attention has been given to Olumo Rock in Abeokuta, Riyom Rock and the Shere Hills both in Jos Plateau. With the clamour for developing other sources of revenue beside oil, the Akure-Ado inselbergs require attention toward proper development and packaging as potential tourist sites with the aim of enlarging the nation’s reserve of tourism products as they will draw local as well as international tourist traffic.

 

 Indian Journal Of Science And Technology

 Journal

 Remote Sensing Analysis Of A Dextral Discontinuity Along Ifewara-Zungeru Area, Nigeria, West Africa.

 Kolawole, F. And Anifowose, A.Y.B.

 2011

The Ifewara-Zungeru megastructure is an over 550 - km long NNE-SSW trending fault stretching from the south just east of Ijebu Ode, through Ifewara and Okemesi to the southwestern edge of the River Niger around Lafiagi. It reappears beneath the sediments of the Nupe Basin and extends northeastwards for over 300 km, through Zungeru to Kalangai. Detailed remote-sensing mapping of the lateral extent of this suspected shear zone using satellite imagery field mapping ground-truthing survey was carried out. Structural analysis of the fault system was done across the entire area that was traversed.The results obtained from this investigation revealed that satellite imagery study of a segment of the megastructure shows a ductile dextral fault zone with a drag towards the NNW direction in Zungeru area. Highlevel folding of meta-sediments exist within the area with directions almost perpendicular to the general NNE-SSWtrend of the host rocks. This faulting caused a measure of morphostructural reorientation of the mylonites and enclosing schistose rocks.