Aeromagnetic Mapping and Radioelement Influence on Mineralogical Composition of Mesothermal Gold Deposit in Part of Ilesha Schist Belt, Southwestern Nigeria

Olomo, Kazeem Oladimeji; Bayode, S.; Alagbe, O. A.; Olayanju, G M; Olaleye, Oluwatoyin Khadijat

doi:10.1080/20909977.2022.2057147

Cited by 5 publications

(2 citation statements)

References 32 publications

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“…Upward continuation (UC) is an enhancement technique that attenuates the magnetic anomalies of shallow structures with respect to long wavelength anomalies and enhances the anomalies of large features (Olomo et al, 2022;Ganiyu et al, 2013). It has application in reducing the effect of small scale features closer to the surface and reduction of topographic effects.…”

Section: Upward Continuation (Uc)mentioning

confidence: 99%

Evaluation of Upward Continuation and Reduction Toevaluation of Upward Continuation and Reduction to Magnetic Equator on Airborne Magnetic Data Magnetic Equator on Airborne Magnetic Data

Oladejo,

Ogunkoya

2023

FJS

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This research work is aimed at interpreting the airborne magnetic data of the study area for mapping the basement geologic structures using magnetic image enhancement filters. It focus on performing filtering techniques to expose and identify the magnetic properties of the basement structures at various continuation distances. The procedure applied to Total Magnetic Intensity (TMI) data of the study area using Oasis MontanjTM software were Reduction to Magnetic Equator (RTME) to remove the inclination effect as well as positioning the peak of the anomalies over their sources so as to improve the orientation of the magnetic sources, separation of regional and residual magnetic anomalies. These was followed by application of upward continuation at 500 m, 1000 m, 2000 m and 3000 m height. The results of the RTME shows the amplitude of the magnetic anomalies ranging from -37.577 nT to 27.398 nT. High magnetic anomaly is dominated in the northwest, southeast through southern part of the study location. Furthermore the results of the Upward Continuation (UC) revealed a wider wavenumber anomalies as well as height above the near surface. Hence the results of this research has displayed an enhanced geological magnetic structures located in the study area and also shows an improved quality of magnetic anomalies as the continuation distances increases.

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Section: Upward Continuation (Uc)mentioning

confidence: 99%

Evaluation of Upward Continuation and Reduction Toevaluation of Upward Continuation and Reduction to Magnetic Equator on Airborne Magnetic Data Magnetic Equator on Airborne Magnetic Data

Oladejo,

Ogunkoya

2023

FJS

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“…However, the radiometric approach offers the most detailed on the discovery and identification of alteration minerals that are indicators for mapping hydrothermal alteration zones (Maden & Akaryali, 2015;Eleraki et al, 2017). This is because direct identification of potassium enriched zones through potassic alteration, genetically linked to gold mineralization can be easily delineated through the distribution of radioelements like Potassium (K), Thorium (Th) and Uranium (U) (Graham & Bonham-Carter, 1993;Grasty & Shives, 1997;Wilford et al, 1997;Ford et al, 2000;Abd El Nabi, 2013;Eleraki et al, 2017;Sanusi & Amigun, 2020;Olomo et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Radiometric Mapping for The Identification of Hydrothermally Altered Zones Related to Gold Mineralization in Ife–Ilesa Schist Belt, Southwestern Nigeria

Akinlalu

2023

Idn. J. Earth Sci.

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This study presents the interpretation of airborne gamma ray spectrometric data to delineate hydrothermally altered zones related to gold mineralization in the Ife–Ilesa Schist belt. K/eTh, Kd and F–Maps highlighting Potassic alterations related to gold mineralization were processed on the Oasis Montaj software and subsequently integrated using fuzzy logic modeling to produce the hydrothermal alteration map of the study area. The C–A fractal analysis was applied to the final hydrothermal map and was able to classify the study area into background, very low, low, moderate, high and very high alteration. These classes reflect the pervasive hydrothermal alteration style of the study area. The hydrothermally altered areas are evident on granitoids and areas proximal to it indicating that granitoids are proxies of heat source. Occurrence of active mining sites in the area agrees with the generated hydrothermal alteration map of the study area with 81% agreement. It therefore shows that radiometric method is a veritable method in mapping hydrothermal alteration areas. The use of radiometric method only cannot reliably map areas of gold mineralization as mineralization can be associated with several other processes. Hence, other methods involving geochemical and magnetic methods including GIS tools can be employed for further prospecting.

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Geophysical characterisation of subsurface structures related to gold mineralisation in the Mpambaa area, SE of Iramba–Sekenke Greenstone Belt, Tanzania

Laizer,

Mulibo

2024

Med. Geosc. Rev.

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Aeromagnetic Mapping and Radioelement Influence on Mineralogical Composition of Mesothermal Gold Deposit in Part of Ilesha Schist Belt, Southwestern Nigeria

Cited by 5 publications

References 32 publications

Evaluation of Upward Continuation and Reduction Toevaluation of Upward Continuation and Reduction to Magnetic Equator on Airborne Magnetic Data Magnetic Equator on Airborne Magnetic Data

Evaluation of Upward Continuation and Reduction Toevaluation of Upward Continuation and Reduction to Magnetic Equator on Airborne Magnetic Data Magnetic Equator on Airborne Magnetic Data

Radiometric Mapping for The Identification of Hydrothermally Altered Zones Related to Gold Mineralization in Ife–Ilesa Schist Belt, Southwestern Nigeria

Geophysical characterisation of subsurface structures related to gold mineralisation in the Mpambaa area, SE of Iramba–Sekenke Greenstone Belt, Tanzania

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