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| Paper Type | : | Research Paper |
| Title | : | Geophysical Investigation for Engineering Site Development around Galadimawa-Aleita Area, Abuja, North Central Nigeria |
| Country | : | Nigeria |
| Authors | : | Longpia, C. B., Ashano E. C., Pam B. G. |
 |
: | 10.9790/0990-0160111  |
Abstract: Fifty five (55) geo-electric resistivity soundings (VES) were carried out in profiles at interval of 250m and station interval of 200m around Galadimawa-Aleita area, Abuja in an attempt to have some detailed geotechnical information for planning purposes as regards infrastructural development which include buildings, roads, bridges and water supply through groundwater resources.The computer aided VES data interpretation enabled the determination and delineation of geo-electric layers and structures that have significance in infrastructural development and water supply.Geo-electric sections revealed 3-4 geo-electric layers/lithologic units of topsoil, laterite, weathered basement and resistive bedrock and are characterised by resistivity values of 122 to 600 ohm-m, 800 to 3385 ohm-m, < 100 to 5000 ohm-m and 120 ohm-m to infinity respectively. Variable thicknesses of 0.8 to 8m, 0.1-1m, and 4-8m were recognized for topsoil, laterite and weathered basement respectively. Depth to bedrock is variable from 0.8-24m across the area.Fractures were identified across the area with complex and major deformation around the central area, near the two abandoned quarries. These quarries were submerged by water issuing out of the sub-surface fault system which led to their abandonment by the quarry operators.The study revealed that overburden materials overlying bedrock are thin and characterized by minor and major fracturation which are significant in infrastructural development planning.
Keywords: Geophysical investigation, geotechnical planning, infrastructural development, Galadimawa-Aleita area, Abuja.
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| Paper Type | : | Research Paper |
| Title | : | Using Rational Polynomial Functions for rectification of GeoEye-1 imagery |
| Country | : | Italy |
| Authors | : | Pasquale Maglione, Claudio Parente, Andrea Vallario |
|
: | 10.9790/0990-0161217 |
Abstract: GeoEye-1 panchromatic images (geometric resolution: 0.5 m) can be rectified using Rational Polynomial Functions (RPFs) without knowledge of the full sensor information: rectification is conducted using
DEM (Digital Elevation Model) of the area as well as Ground Control Points (GCPs) of which both elevation
and X,Y position must be known. Check Points (CPs) with the same characteristics of GCPs (but not coincident
with them) are used to verify the accuracy of the product. For both GCPs and CPs coordinates can be not only
obtained with survey, but also derived from detailed maps or orthophotos (scale 1:5,000 or greater). In this
paper methods to rectify GeoEye-1 images using orthophotos (scale 1:2,000) for GCPs and CPs detection are
considered, with particular attention to achieved positional accuracy. The research is performed on GeoEye-1
panchromatic image of an area in Campania region (Italy) around the mouth of Volturno river and Domitian
coast: differences between the coordinates of GCPs (as well as of the Check Points) on the ortophotos and the
corresponding values on the rectified image are calculated and analyzed to define quality of resulting product.
The variability of results in relation to the number of GCPs is analysed, also considering possibilities to use
additional information that is usually supplied by providers with Rational Polynomial Coefficients (RPCs).
Keywords: GeoEye-1 imagery, rectification, RPFs, RPCs, GCPs, CPs.
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| Paper Type | : | Research Paper |
| Title | : | Geology and Gold Mineralization around Kutcheri, northwestern Nigeria |
| Country | : | Nigeria |
| Authors | : | Amuda, A.K., Danbatta, U.A., Najime, T. |
|
: | 10.9790/0990-0161824 |
Abstract: The study area predominantly consists of metasediments, porphyritic granites with minor amphibolite dykes, quartz vein and quartzofeldspathic intrusions. The metasediments are fractured and folded in places. The dominant fold axes and quartz vein intrusions trend NNE-SSW parallel to the regional foliation of the rocks. Artisanal mining of placer gold mineralization were documented around the banks of Rivers in northwestern part of the study area. Panning of 40kg sediments from pits in the area around Gidan Boss and Dutsen Burka yields 0.28g Au. Grain morphology shows both eluvial and alluvial deposits occur. The eluvial gold are presumed to occur within steeply dipping (70° E and above) quartz veins. Geochemical analysis of 13 quartz vein samples to characterize samples enriched with target (Au) and some pathfinder elements (Pb, Hg, Cu, Ag and Zn) above background levels were carried out. The concentration in ppm had Au (< 1-4.8) and others, Pb (<1-28), Hg (<0.5), Cu (6.2 to 61.4), Ag (<0.5) and Zn (8.8 to 39). There is no significant difference between concentration of analytes in Dutsen Burka and Gidan Boss at α = 0.05. Also, strong positive correlation between Au and Cu, Au and Pb confirms they are indicator elements for Au in the area.
Keywords: correlation, fold axes, geochemical analysis, pathfinder and target elements, placer gold.
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