Integration Of Qualitative And Quantitative Analysis For Mineral Resources Mapping In Omu-Aran Schist Belt Zone, Nigeria
| dc.contributor.author | John, Stephen Kayode | |
| dc.date.accessioned | 2018-01-10T06:54:21Z | |
| dc.date.available | 2018-01-10T06:54:21Z | |
| dc.date.issued | 2017-08 | |
| dc.description.abstract | 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 manetic 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. | en_US |
| dc.identifier.uri | http://hdl.handle.net/123456789/5354 | |
| dc.language.iso | en | en_US |
| dc.publisher | Universiti Sains Malaysia | en_US |
| dc.subject | Qualitatively analyse the airborne | en_US |
| dc.subject | data to map the subsurface geological | en_US |
| dc.title | Integration Of Qualitative And Quantitative Analysis For Mineral Resources Mapping In Omu-Aran Schist Belt Zone, Nigeria | en_US |
| dc.type | Thesis | en_US |
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