Dr. John S Kayode | Universiti Sains Malaysia (original) (raw)
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Papers by Dr. John S Kayode
Regional and local geological mapping play an important role in the understanding of fractured ro... more Regional and local geological mapping play an important role in the understanding of fractured rock system. These techniques were applied in this study as well as in a comparison with active geophysical methods that respond to the physical properties of objects and materials below the earth surface, (i.e., electrical resistivity and ground penetrating radar; GPR, among others). The two geophysical methods were conducted within the tunnel outcrop. In addition, satellite imagery obtained from Google Earth was used to determine the main lineament pattern present in the area. The geological mapping that consists of the fracture system (i.e., discontinuity) mapping was used to compile the catalog of the fractured system. The electrical resistivity method that was applied alongside the tunnel was compared with the results from the ground penetrating radar method. This study, with the application of regional geological mapping using satellite imagery, was able to give a valuable comparison with in-situ geological mapping. The discontinuity data were plotted in the DIPS software to obtain the lineaments’ orientations in rose diagrams. Low resistivity values were compared with ground penetration radar results and with the lineament pattern. The existence of water-bearing structures within the fractures system inside the rock mass affects the low resistivity values, at the same time as the directions of fractures furthermore match that of the ground penetration radar results. The high resistivity values, as interpreted from the electrical resistivity data, are an indication of a lesser amount of water-bearing structures and therefore a smaller amount of damaged units. The ground penetration radar method produces similar results with the lowest amplitude radar reflections from the water free region, and stronger reflections recorded in the area saturated with water. All the parameters used in this study contribute to a Tunnel Stability Rating System (TSRS) that is in development. The Tunnel Stability Rating System could be a useful method of determining the stability of tunnels, particularly tunnels without rock exposure (e.g. that is covered by shotcrete). The overall goal is to make the evaluation process of rock tunnels able to use an alternative assessment when electrical resistivity and ground penetration radar data are accessible.
Valuable and precious subsurface minerals have been continuously mined illegally in the region of... more Valuable and precious subsurface minerals have been continuously mined illegally in the region of Omu-Aran area in parts of the Nigerian South-western Precambrian Basement Complex. An aeromagnetic data obtained from the Nigerian Geological Survey Agency was analysed to delineate various subsurface geological structures in this area. The subsurface characteristics enrichment of the data was carried out using Fast Fourier Transforms, and the Euler Deconvolution methods that helped in the establishment of the different subsurface magnetic anomalies basement structures emplaced in this part of the Nigerian South-western Precambrian Basement Complex. The study aimed at mapping the main rock types found in the undifferentiated schist that includes some gneiss, schist, quartzite and quartz schist and granite-gneiss in the basement rocks of the area. It also includes delineating, as well as estimating the depths to, the magnetic source of the Ore bodies. Regional- residual separation was applied to the total aeromagnetic data to produce a total magnetic intensity map with the application of Oasis Montaj (2014 software version). Depths to the shallow magnetic anomalies source rock bodies were estimated together with various structural indices that varied between about 0.5SI and 3.0SI at the greatest depth to the shallow anomaly of about 1100m, with the aim of determining the greatest depths approximation for all the subsurface geological structural features in the area.
The integration of Aeromagnetic data and remotely sensed imagery with the intents of mapping the ... more The integration of Aeromagnetic data and remotely sensed imagery with the intents of mapping the subsurface geological structures in part of the South-western basement complex of Nigeria was developed using the PCI Geomatica Software. 2013. The data obtained from the Nigerian Geological Survey Agency; was corrected using Regional Residual Separation of the Total Magnetic field anomalies enhanced, and International Geomagnetic Reference Field removed. The principal objective of this study is, therefore, to introduce a rapid and efficient method of subsurface structural depth estimate and structural index evaluation through the incorporation of the Euler Deconvolution technique into PCI Geomatica 2013 to prospect for subsurface geological structures. The shape and depth of burial helped to define these structures from the regional aeromagnetic map. The method enabled various structural indices to be automatically delineated for an index of between 0.5 SI and 3.0 SI at a maximum depth of 1.1 km that clearly showed the best depths estimate for all the structural indices. The results delineate two major magnetic belts in the area; the first belt shows an elongated ridge-like structure trending mostly along the NorthNortheast-SouthSouthwest and the other anomalies trends primarily in the Northeast, Northwest, Northeast-Southwest parts of the study area that could be attributed to basement complex granitic intrusions from the tectonic history of the area. The majority of the second structures showed various linear structures different from the first structure. Basically, a significant offset was delineated at the core segment of the study area, suggesting a major subsurface geological feature that controls mineralisation in this area.
This paper presents a geophysical surveying for groundwater identification in a resistive crystal... more This paper presents a geophysical surveying for groundwater identification in a resistive crystalline basement hard rock in Isuada area, Southwestern Nigeria. Very low frequency (VLF) electromagnetic and electrical resistivity geophysical techniques combined with well log were used to characterize the concealed near surface conductive structures suitable for groundwater accumulation. Prior to this work; little was known about the groundwater potential of this area. Qualitative and semi-quantitative interpretations of the data collected along eight traverses at 20 m spacing discovered conductive zones suspected to be fractures, faults, and cracks which were further mapped using Vertical Electrical Sounding (VES) technique. Forty VES stations were utilized using Schlumberger configurations with AB/2 varying from 1 to 100 m. Four layers i.e. the top soil, the weathered layer, the partially weathered/fractured basement and the fresh basement were delineated from the interpreted resistivity curves. The weathered layers constitute the major aquifer unit in the area and are characterized by moderately low resistivity values which ranged between about 52 Ωm and 270 Ωm while the thickness varied from 1 to 35 m. The depth to the basement and the permeable nature of the weathered layer obtained from both the borehole and the hand-dug wells was used to categorize the groundwater potential of the study area into high, medium and low ratings. The groundwater potential map revealed that about 45% of the study area falls within the low groundwater potential rating while about 10% constitutes the medium groundwater potential and the remaining 45% constitutes high groundwater potential. The low resistivity, thick overburden, and fractured bedrock constitute the aquifer units and the series of basement depressions identified from the geoelectric sections as potential conductive zones appropriate for groundwater development.
Valuable and precious subsurface minerals has been continuously mined illegally in the region of ... more Valuable and precious subsurface minerals has been continuously mined illegally in the region of Omu-Aran area in parts of the Nigerian Southwestern Precambrian Basement Complex. An aeromagnetic data obtained from the Nigerian Geological Survey Agency was analyzed to delineate various subsurface geological structures in this area. The subsurface characteristics enrichment of the data was carried out using Fast Fourier Transforms, and the Euler Deconvolution methods that helped in the establishment of the different subsurface magnetic anomalies basement structures emplacement in this part of the Nigerian Southwestern Precambrian Basement Complex. The study aimed at mapping the main rock types found in the undifferentiated schist that includes some gneiss, schist, quartzite and quartz schist and granite-gneiss in the basement rocks of the area. Besides, it also includes delineating as well as estimating the depths to the magnetic source of the ore bodies. Regional-residual separation was applied to the total aeromagnetic data to produce a total magnetic intensity map with the application of Oasis Montaj 2014 software version. Depths to the shallow magnetic anomalies source rock bodies were estimated together with various structural indices that varied between about 0.5SI and 3.0SI at the greatest depth to the shallow anomaly of about1100m, with the aim of undoubtedly present the greatest depths approximation for all the subsurface geological structural features in the area.
Regional and local geological mapping play a very decisive role in the understanding of fractured... more Regional and local geological mapping play a very decisive role in the understanding of fractured rock system. These techniques were applied in this study as well as comparison with active geophysical methods that respond to the physical properties of objects and materials below the earth surface, (i.e., electrical resistivity and ground penetration radar; GPR, among others). The two geophysical methods applied, were conducted within the tunnel outcrop. In the meantime, satellite imagery obtained from Google Earth was used to determine the main lineaments pattern present in the area. The geological mapping that consists of the fractures system (i.e., discontinuity) mapping was used to compile the reading of the fractured system. The electrical resistivity method that was applied alongside the tunnel was compared with the results from the ground penetration radar method. This study, with the application of regional geological mapping using satellite imagery, was able to give a treasured comparison with an in-situ geological mapping. The discontinuity data were plotted in the DIPS software to obtain the orientations in the rose diagrams. Low resistivity values were compared with ground penetration radar results and double check with lineament pattern. The existence of water-bearing structures within the fractures system inside the rock mass influences the low resistivity values recorded, at the same time as the directions of fractures furthermore match that of the ground penetration radar results. The high quality of rock mass signaling high resistivity values as interpreted from the electrical resistivity data is an indication of a lesser amount of water-bearing structures and therefore a smaller amount of defective units. Ground penetration radar method present identical results with the lowest refection of radar wave at the dried up region. In the meantime, a heavy reflection of radar wave was recorded at the area saturated with water. All the parameters used in this study contributing to Tunnel Stability Rating System (TSRS) that is the course of development. Tunnel Stability Rating System could be a useful method of determining the stability of tunnel particularly tunnel without rock exposure that are covered by shotcrete. The final target is to make the process of evaluation for rock tunnel to suit easily and alternative assessment when electrical resistivity and ground penetration radar data are accessible.
Water Resources
The hydrogeophysical and hydrochemical analysis of the shallow wells around Ire-Akari area Orita-... more The hydrogeophysical and hydrochemical analysis of the shallow wells around Ire-Akari area Orita-Obele Akure, Ondo state was carried out to understand the geologic layer constituting the aquifer, its suitability or otherwise as source of potable / drinking water and the tendency of the overburden to naturally protect the aquifer. The result of the hydrochemical analysis showed that most of the physio-chemical and microbial parameters are found within the WHO permissible limit. Also, the overburden serves as the protective capacity to prevent surface infiltration/leachate effect particularly at depth greater than 10 m. Therefore, wells of appreciable depth (> 10 m), well ringed, and covered could serve as source of drinking water with minor treatment.
Regional and local geological mapping play an important role in the understanding of fractured ro... more Regional and local geological mapping play an important role in the understanding of fractured rock system. These techniques were applied in this study as well as in a comparison with active geophysical methods that respond to the physical properties of objects and materials below the earth surface, (i.e., electrical resistivity and ground penetrating radar; GPR, among others). The two geophysical methods were conducted within the tunnel outcrop. In addition, satellite imagery obtained from Google Earth was used to determine the main lineament pattern present in the area. The geological mapping that consists of the fracture system (i.e., discontinuity) mapping was used to compile the catalog of the fractured system. The electrical resistivity method that was applied alongside the tunnel was compared with the results from the ground penetrating radar method. This study, with the application of regional geological mapping using satellite imagery, was able to give a valuable comparison with in-situ geological mapping. The discontinuity data were plotted in the DIPS software to obtain the lineaments’ orientations in rose diagrams. Low resistivity values were compared with ground penetration radar results and with the lineament pattern. The existence of water-bearing structures within the fractures system inside the rock mass affects the low resistivity values, at the same time as the directions of fractures furthermore match that of the ground penetration radar results. The high resistivity values, as interpreted from the electrical resistivity data, are an indication of a lesser amount of water-bearing structures and therefore a smaller amount of damaged units. The ground penetration radar method produces similar results with the lowest amplitude radar reflections from the water free region, and stronger reflections recorded in the area saturated with water. All the parameters used in this study contribute to a Tunnel Stability Rating System (TSRS) that is in development. The Tunnel Stability Rating System could be a useful method of determining the stability of tunnels, particularly tunnels without rock exposure (e.g. that is covered by shotcrete). The overall goal is to make the evaluation process of rock tunnels able to use an alternative assessment when electrical resistivity and ground penetration radar data are accessible.
Valuable and precious subsurface minerals have been continuously mined illegally in the region of... more Valuable and precious subsurface minerals have been continuously mined illegally in the region of Omu-Aran area in parts of the Nigerian South-western Precambrian Basement Complex. An aeromagnetic data obtained from the Nigerian Geological Survey Agency was analysed to delineate various subsurface geological structures in this area. The subsurface characteristics enrichment of the data was carried out using Fast Fourier Transforms, and the Euler Deconvolution methods that helped in the establishment of the different subsurface magnetic anomalies basement structures emplaced in this part of the Nigerian South-western Precambrian Basement Complex. The study aimed at mapping the main rock types found in the undifferentiated schist that includes some gneiss, schist, quartzite and quartz schist and granite-gneiss in the basement rocks of the area. It also includes delineating, as well as estimating the depths to, the magnetic source of the Ore bodies. Regional- residual separation was applied to the total aeromagnetic data to produce a total magnetic intensity map with the application of Oasis Montaj (2014 software version). Depths to the shallow magnetic anomalies source rock bodies were estimated together with various structural indices that varied between about 0.5SI and 3.0SI at the greatest depth to the shallow anomaly of about 1100m, with the aim of determining the greatest depths approximation for all the subsurface geological structural features in the area.
The integration of Aeromagnetic data and remotely sensed imagery with the intents of mapping the ... more The integration of Aeromagnetic data and remotely sensed imagery with the intents of mapping the subsurface geological structures in part of the South-western basement complex of Nigeria was developed using the PCI Geomatica Software. 2013. The data obtained from the Nigerian Geological Survey Agency; was corrected using Regional Residual Separation of the Total Magnetic field anomalies enhanced, and International Geomagnetic Reference Field removed. The principal objective of this study is, therefore, to introduce a rapid and efficient method of subsurface structural depth estimate and structural index evaluation through the incorporation of the Euler Deconvolution technique into PCI Geomatica 2013 to prospect for subsurface geological structures. The shape and depth of burial helped to define these structures from the regional aeromagnetic map. The method enabled various structural indices to be automatically delineated for an index of between 0.5 SI and 3.0 SI at a maximum depth of 1.1 km that clearly showed the best depths estimate for all the structural indices. The results delineate two major magnetic belts in the area; the first belt shows an elongated ridge-like structure trending mostly along the NorthNortheast-SouthSouthwest and the other anomalies trends primarily in the Northeast, Northwest, Northeast-Southwest parts of the study area that could be attributed to basement complex granitic intrusions from the tectonic history of the area. The majority of the second structures showed various linear structures different from the first structure. Basically, a significant offset was delineated at the core segment of the study area, suggesting a major subsurface geological feature that controls mineralisation in this area.
This paper presents a geophysical surveying for groundwater identification in a resistive crystal... more This paper presents a geophysical surveying for groundwater identification in a resistive crystalline basement hard rock in Isuada area, Southwestern Nigeria. Very low frequency (VLF) electromagnetic and electrical resistivity geophysical techniques combined with well log were used to characterize the concealed near surface conductive structures suitable for groundwater accumulation. Prior to this work; little was known about the groundwater potential of this area. Qualitative and semi-quantitative interpretations of the data collected along eight traverses at 20 m spacing discovered conductive zones suspected to be fractures, faults, and cracks which were further mapped using Vertical Electrical Sounding (VES) technique. Forty VES stations were utilized using Schlumberger configurations with AB/2 varying from 1 to 100 m. Four layers i.e. the top soil, the weathered layer, the partially weathered/fractured basement and the fresh basement were delineated from the interpreted resistivity curves. The weathered layers constitute the major aquifer unit in the area and are characterized by moderately low resistivity values which ranged between about 52 Ωm and 270 Ωm while the thickness varied from 1 to 35 m. The depth to the basement and the permeable nature of the weathered layer obtained from both the borehole and the hand-dug wells was used to categorize the groundwater potential of the study area into high, medium and low ratings. The groundwater potential map revealed that about 45% of the study area falls within the low groundwater potential rating while about 10% constitutes the medium groundwater potential and the remaining 45% constitutes high groundwater potential. The low resistivity, thick overburden, and fractured bedrock constitute the aquifer units and the series of basement depressions identified from the geoelectric sections as potential conductive zones appropriate for groundwater development.
Valuable and precious subsurface minerals has been continuously mined illegally in the region of ... more Valuable and precious subsurface minerals has been continuously mined illegally in the region of Omu-Aran area in parts of the Nigerian Southwestern Precambrian Basement Complex. An aeromagnetic data obtained from the Nigerian Geological Survey Agency was analyzed to delineate various subsurface geological structures in this area. The subsurface characteristics enrichment of the data was carried out using Fast Fourier Transforms, and the Euler Deconvolution methods that helped in the establishment of the different subsurface magnetic anomalies basement structures emplacement in this part of the Nigerian Southwestern Precambrian Basement Complex. The study aimed at mapping the main rock types found in the undifferentiated schist that includes some gneiss, schist, quartzite and quartz schist and granite-gneiss in the basement rocks of the area. Besides, it also includes delineating as well as estimating the depths to the magnetic source of the ore bodies. Regional-residual separation was applied to the total aeromagnetic data to produce a total magnetic intensity map with the application of Oasis Montaj 2014 software version. Depths to the shallow magnetic anomalies source rock bodies were estimated together with various structural indices that varied between about 0.5SI and 3.0SI at the greatest depth to the shallow anomaly of about1100m, with the aim of undoubtedly present the greatest depths approximation for all the subsurface geological structural features in the area.
Regional and local geological mapping play a very decisive role in the understanding of fractured... more Regional and local geological mapping play a very decisive role in the understanding of fractured rock system. These techniques were applied in this study as well as comparison with active geophysical methods that respond to the physical properties of objects and materials below the earth surface, (i.e., electrical resistivity and ground penetration radar; GPR, among others). The two geophysical methods applied, were conducted within the tunnel outcrop. In the meantime, satellite imagery obtained from Google Earth was used to determine the main lineaments pattern present in the area. The geological mapping that consists of the fractures system (i.e., discontinuity) mapping was used to compile the reading of the fractured system. The electrical resistivity method that was applied alongside the tunnel was compared with the results from the ground penetration radar method. This study, with the application of regional geological mapping using satellite imagery, was able to give a treasured comparison with an in-situ geological mapping. The discontinuity data were plotted in the DIPS software to obtain the orientations in the rose diagrams. Low resistivity values were compared with ground penetration radar results and double check with lineament pattern. The existence of water-bearing structures within the fractures system inside the rock mass influences the low resistivity values recorded, at the same time as the directions of fractures furthermore match that of the ground penetration radar results. The high quality of rock mass signaling high resistivity values as interpreted from the electrical resistivity data is an indication of a lesser amount of water-bearing structures and therefore a smaller amount of defective units. Ground penetration radar method present identical results with the lowest refection of radar wave at the dried up region. In the meantime, a heavy reflection of radar wave was recorded at the area saturated with water. All the parameters used in this study contributing to Tunnel Stability Rating System (TSRS) that is the course of development. Tunnel Stability Rating System could be a useful method of determining the stability of tunnel particularly tunnel without rock exposure that are covered by shotcrete. The final target is to make the process of evaluation for rock tunnel to suit easily and alternative assessment when electrical resistivity and ground penetration radar data are accessible.
Water Resources
The hydrogeophysical and hydrochemical analysis of the shallow wells around Ire-Akari area Orita-... more The hydrogeophysical and hydrochemical analysis of the shallow wells around Ire-Akari area Orita-Obele Akure, Ondo state was carried out to understand the geologic layer constituting the aquifer, its suitability or otherwise as source of potable / drinking water and the tendency of the overburden to naturally protect the aquifer. The result of the hydrochemical analysis showed that most of the physio-chemical and microbial parameters are found within the WHO permissible limit. Also, the overburden serves as the protective capacity to prevent surface infiltration/leachate effect particularly at depth greater than 10 m. Therefore, wells of appreciable depth (> 10 m), well ringed, and covered could serve as source of drinking water with minor treatment.
The study of the subsurface structural patterns technique was carried out to locate, classify and... more The study of the subsurface structural patterns technique was carried out to locate, classify and outline the magnetic anomaly source rocks underlain the Omu-Aran Schist belt zone together with the determination of the depth of these various source rocks within the study area. The processes were carried out through series of E-W and N-S geomagnetic cross-sections across the 58.70 by 56.8 km spreading across the study area, in part of the Nigerian South-western Precambrian Basement Complex. The primary objective of this studies is to use an uncomplicated technique to locate these magnetic anomalies that support mineralisation potential in the area. The subsurface geological structural patterns of this area was adequately mapped using the Oasis Montaj 2014 source parameter imaging function integrated with Surfer 10 and euldph-x Algorithm that automatically computes the depths to the various magnetic anomaly sources using the aeromagnetic data acquired from the Nigerian Geological Survey Agency. These anomaly sources as delineated, consist of arrays of north-north-east and south-south-west trending the underneath structures that control the surface geologic characteristics which determined the mineral prospective in parts of the north-east zone, the north-west and the south-western zones in the study area with very low and high values of the total magnetic intensity. Various geological source models that include; the rock contacts; dykes; sills; cylinders, pipes, and spheres of the magnetic anomalies were delineated. The large dome-shaped structure that overlain a buried block of inferred meta-sedimentary rocks in this area suggests that subsurface mineral distributions in the Omu-Aran Schist belt subsurface Crusts may perhaps be influenced by its location in the highly mineralised Nigerian South-western Basement Complex together with the rich mafic and ultramafic granitic-migmatite Basement Terrain that simultaneously underlain the area.
The paper focused on the use of MATLAB with the application of Standard Laplace Rayleigh Distribu... more The paper focused on the use of MATLAB with the application of Standard Laplace Rayleigh Distribution to established the distribution of the subsurface magnetic anomalies pattern in the study area which bordered the lower Niger Basin in the northern part, the Egbe-Isanlu Schist belt zone in the east and the Ilesha Schist belt zone in the southern part. The research work synthesises the up-to-date knowledge of the Nigerian Precambrian Basement Complex to define the subsurface components of Omu-Aran Schist Belt zone. The importance of this work is the definition of the subsurface geological structures located in the area. The MATLAB was developed to compute the position, depths, nature and shapes of the causative magnetic anomaly sources in this area. The determination of the structural indices in the Omu-Aran Schist Belt zone was applied to delineate magnetic anomaly source geometries in the area. The various subsurface geological anomaly sources obtained are; the vertical and horizontal pipe shapes, rock contacts; dykes; sills; vertical and horizontal cylindrical shapes, and spheres. This approach to analyse the aeromagnetic data as interpreted in this area support the previous study on the mineralisation in Omu-Aran Schist belt zone as been structurally controlled.
This study of the Pattern Recognition Technique was carried out to locate, identify and delineate... more This study of the Pattern Recognition Technique was carried out to locate, identify and delineate the subsurface magnetic anomaly source rocks in the Omu-Aran Schist belt zone together with the determination of the depth of various subsurface magnetic anomaly source rocks within this area. The processes were carried out through series of horizontal and vertical geomagnetic cross-sections across the 58.70 by 56.8km areas of the Omu-Aran Schist belt zone, in the South-western Precambrian Basement Complex of Nigeria. The principal objective is to use an uncomplicated pattern recognition technique to locate these magnetic anomalies that support mineralisation potential in the study area. The subsurface structural pattern of this area was adequately mapped using the Oasis Montaj 2014 source parameter imaging function integrated with other geophysical methods that automatically calculates depths to the various magnetic anomaly from the gridded aeromagnetic data obtained from the Nigerian Geological Survey Agency. These anomaly sources as delineated, comprising arrays of north-north-east and south-south-west trending subsurface structures that influence the geologic features controlling the mineral potential in the north-east, north-west and south-western zones in the study area with very low and high values of the magnetic intensity. Various geological source models such as; rock contacts; dykes; sills; cylinders, pipes, and spheres of the magnetic anomaly delineated in the area. The broader dome-shaped structure that overlain a buried block of inferred meta-sedimentary rocks in this area suggests that subsurface mineralize distribution in the Omu-Aran Schist subsurface crusts may perhaps be influenced by its location in the highly mineralized Nigerian South-western Basement Complex coupled with the rich mafic and ultramafic granitic-migmatite basement terrain Ore rock bodies.
Water leakage from distribution buried pipes is one of extreme threats to water resources control... more Water leakage from distribution buried pipes is one of extreme threats to water resources controlling. It represents severe negative impacts on the environment. Hence, it is highly needed to find out leakage sites to solve such environmental and development problem. The pipe under consideration is made from iron with a diameter of 250 mm. Hence, magnetic method can be used to delineate the location of the pipe. TDEM method is hence used to conjunction magnetic gradiometer method to find out the position along the buried iron pipe. Magnetic gradiometer conducted at three long profiles parallel to the pipe. TDEM, on the other hand, is carried out at four profiles across the pipe. The result of gradiometer clearly mapped the extension of the pipe. In addition, certain negative anomaly is observed starting at the leakage position. TDEM which was conducted using single loop array of side-length of 10m, delineate two low resistivity anomalies. The first one is located near the end of the pipe, whereas the other is located at the leakage position. The first anomaly extends to deeper depths (possibly greater than 30m) and can be interpreted as possible accumulation of hot water.
Regional and local geological mapping play a very decisive role in the understanding of fractured... more Regional and local geological mapping play a very decisive role in the understanding of fractured rock system. These techniques were applied in this study as well as comparison with active geophysical methods that respond to the physical properties of objects and materials below the earth surface, (i.e., electrical resistivity and ground penetration radar; GPR, among others). The two geophysical methods applied, were conducted within the tunnel outcrop. In the meantime, satellite imagery obtained from Google Earth was used to determine the main lineaments pattern present in the area. The geological mapping that consists of the fractures system (i.e., discontinuity) mapping was used to compile the reading of the fractured system. The electrical resistivity method that was applied alongside the tunnel was compared with the results from the ground penetration radar method. This study, with the application of regional geological mapping using satellite imagery, was able to give a treasured comparison with an in-situ geological mapping. The discontinuity data were plotted in the DIPS software to obtain the lineaments’ orientations in the rose diagrams. Low resistivity values were compared with ground penetration radar results and double check with lineament pattern. The existence of water-bearing structures within the fractures system inside the rock mass influences the low resistivity values recorded, at the same time as the directions of fractures furthermore match that of the ground penetration radar results. The high quality of rock mass signalling high resistivity values as interpreted from the electrical resistivity data is an indication of a lesser amount of water-bearing structures and therefore a smaller amount of defective units. Ground penetration radar method presents identical results with the lowest reflection of radar wave at the dried up region. In the meantime, a heavy reflection of radar wave was recorded at the area saturated with water. All the parameters used in this study contributing to Tunnel Stability Rating System (TSRS) that is the course of development. Tunnel Stability Rating System could be a useful method of determining the stability of tunnel particularly tunnel without rock exposure that is covered by shotcrete. The final target is to make the process of evaluation for rock tunnel to suit easily and alternative assessment when electrical resistivity and ground penetration radar data are accessible.
Valuable and precious subsurface minerals that has been continuously mined illegally in the regio... more Valuable and precious subsurface minerals that has been continuously mined illegally in the region of Omu-Aran area in parts of the Nigerian South-western Precambrian Basement Complex. An aeromagnetic data obtained from the Nigerian Geological Survey Agency was analyzed to delineate various subsurface geological structures in this area. The subsurface characteristics enrichment of the data was carried out using Fast Fourier Transforms, and the Euler Deconvolution methods that helped in the establishment of the different subsurface magnetic anomalies basement structures emplacement in this part of the Nigerian South-western Precambrian Basement Complex. The study aimed at mapping the main rock types found in the undifferentiated schist that includes some gneiss, schist, quartzite and quartz schist and granite-gneiss in the basement rocks of the area. Besides, it also includes delineating as well as estimating the depths to the magnetic source of the Ore bodies. Regional- residual separation was applied to the total aeromagnetic data to produce a total magnetic intensity map with the application of Oasis Montaj 2014 software version. Depths to the shallow magnetic anomalies source rock bodies were estimated together with various structural indices that varied between about 0.5SI and 3.0SI at the greatest depth to the shallow anomaly of about1100m, with the aim of undoubtedly present the greatest depths approximation for all the subsurface geological structural features in the area.
Shallow geophysical surveying can play an important role to explore relatively shallow depths tha... more Shallow geophysical surveying can play an important role to explore relatively shallow depths that can reach down to few hundreds of meters. This depth may represent the target
depth for exploring the hot spring aquifer. Sungai Klah hot spring is one of the important touristic sites in Perak. It depends mainly on the hot water that flow up to the surface. Hence, for any future development for the area the parameters of the geothermal aquifer should be identified. Also, previous investigation proposed that the geothermal aquifer possesses high enthalpy that point out that the area has high potential for an energy resource. Due to this motivation numbers of geophysical techniques were applied at Sungai Klah area. These
geophysical techniques are TDEM, seismic reflection, MASW and potential methods (gravity and geomagnetism). These techniques were applied in an integrated strategy to minimize the ambiguity of the models. The models obtained from geophysical surveys indicate that the aquifer is probably at a depth of few hundred meters. This finding agrees with the estimated temperature of the aquifer deduced for geochemical analysis. The techniques also propose an image on some of the structures that may handle the water propagation up to the surface.
Conference Paper
This paper presents research results on the impacts of subsurface water on the east coast Peninsu... more This paper presents research results on the impacts of subsurface water on the east coast Peninsular Malaysian floods, therefore complementing the existing data on the flooding events in this area. In our finding, we report on the vulnerability of the aquifer units in the flood-affected communities to floods during intense precipitations, and then proffer solutions to prevent near future occurrence. We
applied electrical resistivity tomography methods of geophysical prospecting and borehole lithologic log to study the subsurface structures prone to floods. Depth to the subsurface water bearings structures were delineated at ≥ 5m devoid of protective structures; this makes the affected area
vulnerable to flooding during intense precipitation.
Omu-Aran area is characterized by mining activities to exploit the valuable mineralization there.... more Omu-Aran area is characterized by mining activities to exploit the valuable mineralization there. These facts motivated the present work to evaluate the factors controlling the mineralization in the study area using aeromagnetic data obtained from the Nigerian Geological survey Agency. The data was processed and interpreted with the mean of delineating subsurface geological structures around Omu-Aran in Kwara State, South-western Nigeria. Data enhancement methods was performed on the aeromagnetic map using Regional Residual Separation of the total field anomalies map; horizontal gradient enhanced and International Geomagnetic Reference Field (IGRS) removed; reduced to the pole magnetic shaded relief image was carried out; Magnetic vertical gradient calculated, Magnetic horizontal gradient measured and Analytical signal map was constructed using some computer aided packages. The interpreted map enabled delineation of various subsurface geological structures such as the rock contacts, fractured and faulted areas.
The major difference between science or engineering and other types of intellectual discipline i... more The major difference between science or engineering and other types of intellectual discipline is that scientists focus on the natural world to determine the validity of their statements. In practical terms, this means that experimentation and their results must be quantitatively analysed using numbers. By comparing numbers, a scientist or an engineer can convince anyone the truth of his position. Naturally, experiments involve uncertainty and vagueness. Therefore, numbers are likely to vary when they are repeated. The differences in the results may be as a result of using different methods, materials or equipment. Fortunately, the uncertainty can be expressed numerically. Hence, the result of any experiment is given with at least two numbers: the best possible value obtained and a measure of uncertainty in the best value. Having performed this experiments, an experimentalist can, therefore, compare his results with those of others or with his previous works. How to estimate uncertainty or error either from the data itself or the knowledge of the system is the subject of experimental design and data analysis.
This compendium is written to assist students in this area of knowledge. The new approach adopted is the integration of basic concepts from mathematics, physics, and computer science. We consider this a modern method of learning suitably designed and packed by an initiative from Covenant University. The other parts of this chapter enumerate the necessary guiding principles needed to direct students to understand the intricacies required in the laboratory. Hence, the book is most useful for laboratory courses on practical physics, and it is structured into nine chapters for easy comprehension. The second chapter presents the elementary mathematics and statistics found helpful for the initial preparation for laboratory work in physics. Chapter three treats basic ideas in the design of experiment and data analysis. The ideas in chapters two and three are put into practical use in chapter four by introducing computer as a potential tool useful in the physics laboratory. Traditionally, data analysis in physics practical is carried out by the use of free-hand, calculator or four figure table. This method is ancient and highly limited in several ways. Fortunately, the use of computer has several benefits and many computer programs to ease your work by doing most of the things for you. Such a program recommended is the Microsoft Excel, which has most functions needed for statistical, scientific or engineering computations. The rest of the chapters concern several practical assignments that are to be done in the laboratory (LAB).
A study using the subsurface structural patterns technique was carried out to locate, classify an... more A study using the subsurface structural patterns technique was carried out to locate, classify and outline the magnetic anomaly source rocks underlying the Omu-Aran Schist belt zone together with determination of the depth of these various source rocks within the study area for sustainability. The processes were carried out through a series of E-W and N-S geomagnetic cross-sections of 58.70 by 56.8 km spread across the study area in part of the Nigerian South-western Precambrian Basement Complex. The primary objective of this study was to use an uncomplicated technique to locate these magnetic anomalies and identify the mineralization potential in the area. The subsurface geological structural patterns in this area were adequately mapped using the Oasis Montaj 2014 source parameter imaging function integrated with Surfer 10 and euldph-x algorithms that automatically compute the depths of the various magnetic anomaly sources using aeromagnetic data acquired from the Nigerian Geological Survey Agency. These anomaly sources as delineated, consist of arrays of north-north-east and south-south-west influencing the underground structures that control the surface geologic characteristics which determine the mineral potential in parts of the north-east, the north-west and the south-western zones of the study area with very low and high values of total magnetic intensity. The large dome-shaped structure that overlies a buried block of inferred metasedimentary rocks in this area suggests that subsurface mineral distributions in this area may perhaps be influenced by its location in the highly mineralized Nigerian South-western Basement Complex together with the rich mafic and ultramafic granitic-migmatite Basement Terrain that also underlies the Omu-Aran area.
Thesis, 2017
The needed geoscientific knowledge in the Omu-Aran schist belt area is deficient as there were no... more The needed geoscientific knowledge in the Omu-Aran schist belt area is deficient as there were no sufficient previous geoscientific reports by researchers on this mineralised area. A high-resolution aeromagnetic data obtained from the Nigerian Geological Survey Agency was integrated with the remotely sensed data, analysed to delineate various subsurface geological structures controlling the emplacement of these solid minerals in the area particularly the lineaments. The study aimed at qualitatively analyse the airborne magnetic data; the Digital Elevation Model, and the Thematic LandsatTM 8 data to map the subsurface geological structural patterns of all the rock types found in the undifferentiated schist that includes some migmatite gneiss schists; quartzite and quartz schists, marble and granite-gneisses. The primary objective is to use a straightforward technique to locate these anomalies through series of East-West and North-South geomagnetic profiles distributed within the study area. The subsurface characteristics enrichment of the data was carried out using the Fast Fourier Transforms, and the Euler Deconvolution methods that helped in the establishment of the different subsurface magnetic anomalies basement structures in the study area. The results from Euler Deconvolution techniques generated the six structural indices that varied between about 0.5SI and 3.0SI, with maximum constraint depths at about 1.2 km for all the subsurface geological structural features in the area. Sources to the subsurface anomalies as delineated, consist of dominant near vertical structural arrays of north-north-east and south-south-west trending the underneath structures that control the surface geologic characteristics which could be one of the primary factors responsible for the mineralisation in parts of the north-east; the north-west, and the south-western zones of the study area as confirmed by the linearment map; the rose diagram plot, the mangetic intensity reduced to the pole map, the analytical and upward continuation map and the rock contacts and structural patterns maps. Quantitative analysis with the applications of MATLAB and Supervised Machine Learning tool was implemented to validate the results from the Euler solutions. Qualitative and quantitative analysis of some selected rocks samples from the geological fieldwork was carried out using the X-ray Fluorescence Analyser; the Scanning Electron Microscope, and the Energy Dispersive X-ray Analysis mapping of the elements present in these rocks to study in detail the degree of changes due to chemical and physical weathering as well as effects of tectonic activies on these mineralised hosting rocks. Results of the rocks samples analysis showed that Omu-aran schist belt is characterised by high siliceous with higher contents of Sillimanite, Al2(SiO5) minerals and low contents of Fe2O3, K2O and Na2O minerals proving that the parent rocks in this area could be from sedimentary source that are reach in silica (SiO2) and varied in percentage weight from 5% to 96% of SiO2. The magnetic anomalies obtained produced a strong low value of the magnetic intensity in the order of –643.4979nT, correlating with the places delineated as clay minerals deposits such as Talc and Mica minerals or carbonaceous rocks like the marble and dolomite. On the other hands, places with the migmatite granitic rocks produced strong positive magnetic intensity anomaly of about 551.2052nT. GIS geospatial technique was used to present the results as 3-D modelling maps. The structural patterns obtained along the 12 geomagnetic cross-sections profiles are evident of paragenetic sequence of these subsurface anomalies as corroborated by the rock contacts and the structural patters maps. The rocks in Omu-Aran area are interbedded with quartzite and is paragenetic with such Precambrian Basement Complex rocks as dolomitic marble, pure marble, phyllites, calc-gneiss, schist and minor intrusions, all of which have been subjected to at least two periods of folding as well as multiple fracturing and sharing as delineated in all the results of this research work.