Teshome, Fantahun Gebrie (2011) Integrated Geophysical Investigations for Gold in Dembi Dolo Zone, Western Ethiopia. Masters thesis, Addis Ababa University.
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Abstract
This manuscript presents a Masters degree thesis dealing with an integrated, IP/Resistivity and magnetic, surveys conducted as part of a systematic exploration program to map the subsurface litho-structural features favourable for gold mineralization in Gute Soyoma area, Dembi-Dolo zone, of western Ethiopia. The geophysical surveys particularly aim at mapping the subsurface signatures of rock units and structural controls responsible for the observed high gold values seen in a systematic geochemical survey over selected targets. Geologically, the study area is located in the western Ethiopia shield and covered with basement rocks hosting economic metallic mineral deposits. It consists of gneissic rocks and metasedimentary-metavolcanics assemblages (amphibolite to greenschist facies). These rock assemblages host gold and other base metal mineralizations. Qualitative interpretation of the total field magnetic data along eight profiles showed the presence of magnetic minerals and possible shear related structures, which are litho-structural indications of gold mineralization. On the other hand, appraisal of six traverse lines of IP/Resistivity data revealed that along most of the survey lines, over the regions of high gold showings, high IP amplitudes (>25mV/V), over a background of 1 – 5mV/V, were detected and very often, spatially associated to zones very high resistivity (in excess of 2000Ωm). These are interpreted to arise from sulphide minerals in silicified zones, which are closely associated to the main structural features such as shearing. The current results of the integrated methods of IP/Resistivity and magnetic have showed good correlations, reduced the ambiguity inherent of the geophysical data interpretations, and highlights the sulphide minerals are disseminated type and hosted by intuitively silicified rocks. These prominent geophysical anomalous zones attributed to the mineralized zone have been shown to be open to the eastern and southern border of the current detail area. Therefore, continuation along these directions is highly recommended.
| Item Type: | Thesis (Masters) |
|---|---|
| Subjects: | Q Science > QE Geology |
| Divisions: | Africana |
| Depositing User: | Selom Ghislain |
| Date Deposited: | 30 Oct 2018 12:45 |
| Last Modified: | 30 Oct 2018 12:45 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/7153 |
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