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| Paper Type | : | Research Paper |
| Title | : | Power Spectral Analysis and Edge Detection of Magnetic Data of Migori Greenstone Belt, Kenya |
| Country | : | Kenya |
| Authors | : | Odek Antony || Githiri John || K'Orowe Maurice || Ambusso Willis |
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: | 10.9790/0990-0604010110  |
Abstract: With the continuous extraction of minerals in Migori greenstone belt, exploration is currently evolving from surface based exploration to subsurface exploration. This necessitates a good understanding of the geophysical features in the subsurface which are likely to have a direct bearing on the distribution of minerals. In this study, the measured total magnetic field data was subjected to cleaning process to remove perturbations which are not of geophysical interest, and later enhanced by removing long wavelength anomalies which are as a result of regional magnetic trend. Power spectral analysis of geologically constrained magnetic intensity field data was then conducted, in order to obtain the limiting depth of the anomaly causative bodies. Edge detection techniques were then employed on the delineated magnetic field intensity anomalies trending WNW-ESE along the belt...........
Keywords- Magnetic, Anomalies, Migori Greenstone belt, Inversion, Minerals
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| Paper Type | : | Research Paper |
| Title | : | Application of Seismic Refraction Tomography in Delineating Subsurface Geology and Weathering Structures in Parts of Osubi Delta State |
| Country | : | Nigeria |
| Authors | : | Orji Omafume M || Eze Stanley |
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: | 10.9790/0990-0604011120 |
Abstract: Seismic refraction tomography have been carried out at a site located in Osubi area of Delta state,Nigeria, to establish a database on the subsurface geology and structural setting of the area for engineering purposes. A total of twenty (20) seismic refraction data using forward and reverse shooting methods of lateral distance 2m along each shot points were acquired within the study area. The results indicate the presence of three seismic refraction layers with the first layer having a velocity of 150-366m/s and thickness 1.0-3.3m, representing topsoil. The second refraction layer is composed of lateritic clay with thickness 4.5-10.5m and a velocity of 578-878m/s. The third refraction layer consists of sandy clay with a velocity of 1000-2500m/s. 2D geologic sections computed from transformed seismic velocities show that within the subsurface exists low permeable material (sandy........
Keywords: Seismic refraction, tomography, Seismic velocity, Geologic section.
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| Paper Type | : | Research Paper |
| Title | : | Compositional variation of Spinel from metamorphic rocks of Digapahandi area, Eastern Ghats Belt, India |
| Country | : | India |
| Authors | : | Sagar Misra || Neeraj Vishwakarma |
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: | 10.9790/0990-0604012127 |
Abstract: Eastern Ghats Belt is a poly-metamorphic terrain, represents high to ultra-high temperature metamorphic condition. The temperature dominant metamorphism has proved by the presence of spinel bearing mineral assemblages like, spinel + quartz, spinel + sillimanite + cordierite, sapphirine + spinel etc. Present paper focus on spinel mineral chemistry, which present as a common phase in both leptynite and khondalite rocks around Digapahandi area of Eastern Ghats Belt. Petrographic observation confirms the presence of two different types of spinel in the rock. Coarse grain anhedral spinels are common in khondalites whereas in leptynites both euhedral and anhedral small spinels are present. EPMA analysis indicates that there is a distinct compositional variation in the spinel from both the rocks, although all the spinel falls under the category of Al-rich spinel series. These evidences clearly reflect that both the rocks have suffered diverse metamorphic history.
Keywords: Spinel, leptynite, khondalite, Eastern Ghats Belt, granulite.
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