Elsevier International Publishing

 Journal

 Aeromagnetic Mapping Of Basement Structures And Mineralization Characterization Of Ilesa Schist Belt, Southwestern Nigeria

 Akinlalu, A.A., Adelusi, A.O., Olayanju, G.M., Adiat, K.A.N., Omosuyi, G.O., Anifowose, A.Y.B. And Akeredolu, B.E.

 2018

This paper analysed aeromagnetic data over the southern Ilesa schist belt of Nigeria with a view to assessing the sub surface structural settings that might favour mineralisation in the study area. Enhancement of the total magnetic intensity map was carried out to improve the anomaly characteristic of source bodies through upward continuation and reduction to the equator (RTE) of the magnetic ?eld intensity. Estimation of depth to the deep, intermediate and near surface structures was based on the Spectral analysis and Euler deconvolution of the aeromagnetic data. Extracted magnetic anomalies from the RTE map range in amplitude from 115 to 134 nT, with the high magnetic intensities occurring over amphibolite, schist, porphyritic granite, gneiss and undifferentiated Migmatite, while low magnetic intensities were observed over quartzite and the undifferentiated schist. The Euler deconvolution solutions revealed that the area is mainly affected by sill/dyke and horizontal cylinder/pipe geologic model with estimated depth to the magnetic source ranging from 73 me345 m. The depth estimated from the spectral analysis was in the range of 100 me300 m for the intermediate and shallow sources; this compares reasonably well with the results from the Euler deconvolution. The orientations of lineaments extracted from the total horizontal derivative, source edge detection and Euler deconvolution suggest predominantly NE-SW trending structures, characteristic of primary geologic events in the area, while few E-W trending lineaments are imprints of secondary structural alteration in magnetic fabrics in this direction. Thus, the delineated structures are believed to be the hosts to the mineralised targets as observed from small scale mining activities in the area. 

 Global Journal Of Geological Sciences

 Journal

 An Integrated Exploration Technique For Groundwater On A Part Of The Basement Complex Of Southwestern Nigeria.

 Yenne, E.Y., Anifowose, A.Y.B. And Yohanna, M. O.

 2018

Akure is underlain by the basement complex rocks of southwestern Nigeria. It is faced with difficulty in the search for groundwater due to lateral discontinuity of basement lithologies. This study therefore delineates possible groundwater potential zones through the integration of remote sensing and electrical resistivity data. Landsat TM data was digitally processed and used to produce lineament, lineament density and intersection maps while hydrogeological parameters were obtained from electrical resistivity method and used in the production of overburden/fractured map. Weighted overlay method was utilized in ArcGIS in order to integrate the two maps so as to produce groundwater potential map of the study area. The groundwater potential map showed four major areas of groundwater potentials viz; very low, low, high and very high groundwater potential areas. An average of 0.9445litres of groundwater is discharge per second in the area i.e., approximately 3, 400litres per hour of groundwater is disharge in th area. However, a critical analysis of borehole yields show that boreholes with the poorest yields pump at a rate of between 0.2 to 0.5 l/s which is higly inadequate while very good boreholes pump at the rate of 1.14 to 2.16 l/s . Infact, most areas with good yields are cited in the southwestern portions of the study area.

Global Journal of Geological Sciences, Vol. 16, pp. 45-61

 

 De Gruyter Publishers

 Journal

 Hydrogeochemical Characterization And Vulnerability Assessment Of Shallow Groundwater In Basement Complex Area, Southwest Nigeria.

 A.J. Adewumi, A.Y.B. Anifowose, F.O. Olabode And T.A. Laniyan

 2018

Thirty-five (35) groundwater samples from Owo area were analyzed for physicochemical parameters. Results show that the mean value of pH is 6.32, TDS is 208.92 mg/l, temperature is 28.77o C, EC is 545.16 ?s/cm; TH is 111.09 mg/l, SO4 is 71.73 mg/l, Cl is 0.07 mg/l, HCO3 is 14.09 mg/l, Na is 25.06 mg/l, Ca is 37.07 mg/l, K is 24.36mg/l and Mg is 4.41 mg/l. The results were compared to the WHO and NDSQW standards. All parameters were within the permissible limit except EC in well OW6 and K is above the stipulated standards in 69% of the total samples. The high concentration of K is linked to the use of NPK fertilizer in the area for agricultural purposes. The groundwater belongs to Ca-Na-K-SO4 and Na-Ca-SO 4 water type respectively. The ionic concentration in the groundwater is due to the dissolution of the rock that makes up the aquifer. Plagioclase and silicate-bearing rocks are the sources of major ions in the water. SAR, PI, RSBC and KR reveals that groundwater in the area is good for irrigation purpose. DRASTIC model further revealed that groundwater in the area is less vulnerable to contamination under the current environmental conditions. 

 Springer

 Journal

 Hydrogeologic Characterization Of Owo And Its Environs Using Remote Sensing And GIS.

 Adewumi, A.J. And Anifowose, Y.B.

 2017

Hydrogeologic characterization of Owo and its environs using Remote Sensing and GIS. Applied Water Science, DOI 10.1007/s13201-017-0611-8.

 

 African Geophysical Society

 Technical Papers

 Spatio-temporal Characterization Of Colored Dissolved Organic Matter (CDOM) In The Gulf Of Guinea, Southwestern Nigeria – An Index For Assessing Marine Ecosystem Quality.

 Akinluyi, F. O., Akinyede, J. O. And Anifowose, A.Y.B.

 2017

The Gulf of Guinea (GoG) is bordered inland by the coastal shoreline of the Atlantic Ocean, extending from Guinea Bissau in West Africa to the coast of Angola in southern Africa. The effect of the Guinea current is evident in the inland push centered on the coastal area of South Western Nigeria. The effect of the geomorphologic processes and anthropogenic activities on this portion of the GoG is particularly remarkable because of effluent from creeks and flood waters and discharges of waste products. The productivity of the central Gulf of Guinea (GoG) is said to largely depend on nutrient input from land drainage, river floods and turbulent diffusion. Studies have also shown that seasonal upwelling occurs in the central GoG. These characteristic features create opportunity for this study in view of the potential implications on the shallow marine ecosystem in the region. Coloured Dissolved Organic Matter (CDOM) concentrations can  be  quite variable in coastal  systems, since  variations  in freshwater  inputs,  estuarine  mixing processes, photochemical  reactions,  and  in-situ  production all change  the  amount present  over a variety of spatial and temporal  scales. This study was carried out using SeaWiFS (Sea‐viewing Wide Field‐of‐view Sensor) monthly dataset, and geographic information systems.

 

 Global Journal Series

 Journal

 A Preliminary Assessment For Groundwater In A Part Of North Central Nigeria Using Landsat ETM+

 Anifowose, A.Y.B. And Aladejana, O.O.

 2016

Global Journal of Geological Sciences, 14, pp. 1-12.

 

 Springer International Publishing, Switzerland

 Journal

 GIS-based Estimation Of Soil Erosion Rates And Identification Of Critical Areas In Anambra Sub-basin, Nigeria.

 Fagbohun, B.J., Anifowose, A.Y.B., Odeyemi, C., Aladejana, O.O. And Aladeboyeje, A.I.

 2016

GIS-based Estimation of Soil Erosion Rates and Identification of critical areas in Anambra sub-basin, Nigeria. Model. Earth Syst. Environ. 2: 159.

 

 Springer

 Journal

 Testing The Ability Of An Empirical Hydrological Model To Verify A Knowledge-Based Groundwater Potential Zone Mapping Methodology.

 Aladejana, O. O., Anifowose, A.Y.B. And Fagbohun, B. J.

 2016

Testing the Ability of an Empirical Hydrological Model to Verify a Knowledge-Based Groundwater Potential Zone Mapping Methodology. Model. Earth Syst. Environ. 2: 174. doi: 10.1007/s40808-016-0234-3. Accepted 26 September, 2016. Published Online, 05 October, 2016 

 

 IOSR Journal Of Environmental Science, Toxicology And Food Technology

 Journal

 An Assessment Of The Relationship Between Lineaments And Groundwater Productivity In A Part Of The Basement Complex, Southwestern Nigeria.

 E.Y. Yenne, A.Y.B. Anifowose, H.U. Dibal And R.N. Nimchak

 2015

The study area is a basement complex environment with its associated difficulties in groundwater supply as a result of lateral discontinuity in basement lithologies. This study assessed and established therelationships that exist between lineaments and borehole yields. Five Hundred and thirteen (513) lineaments were extracted and analyzed from remote sensing data obtained from global land cover facilities of which several lineament maps were generated using ArcGIS® software. Twenty seven (27) yield data were interpreted, correlated and evaluated with the produced lineaments. Results indicated three (3) categories of yields exist in the study area: low yields (<0.2 l/s), moderate yields (0.5 -1.0 l/s) and high yields (>1.0 l/s). Thus, the high yielding boreholes are found at the center of the study area where lineament density is high. Further analyses carried out show that the productivity of a borehole is strongly affected by its closeness to an extensional lineament but insignificantly influenced by its closeness to a lineament intersection points in the area. The study also indicated that the presence of thick overburden to bedrock is also a key factor in controlling groundwater productivity.

 

 Global Journal Of Geological Sciences

 Journal

 Deformation And Lineament Studies Of Rocks In Omifunfun Area, Southwestern Nigeria: Remote Sensing And Petrographic Observations.

 Anifowose, A.Y.B. And Adetunji, A.

 2015