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2.5D Modelling of Aeromagnetic Data and their Mining Implications over the Ngaoundere Area (Adamawa Province, Cameroon)

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International Journal of Geosciences 2019年第2期10卷 173-192页

作者： Meying Arsène Gouet Daniel Hervé Ndougsa Mbarga Theophile ndam njikam mouhamed Owono Amougou Olivier Ulrich Igor School of Geology and Mining Engineering University of Ngaoundere Meiganga Cameroon Department of Petroleum Mining & Groundwater Resources Exploration Faculty of Mines and Petroleum Industries University of Maroua Maroua Cameroun Department of Physics Advanced Teacher’s Training College University of Yaoundé I Yaoundé Cameroon Postgraduate School of Science Technologies & Geosciences University of Yaoundé I Yaoundé Cameroon

This study is based on the analysis and interpretation of aeromagnetic data using version 8.4 of the Geosoft Oasis Montaj Software, to map the subsurface or deep geological structures that affected the geological formations of the Ngaoundere area. The use of the standard aeromagnetic methods made it possible to draw up the maps of the residual magnetic field reduced to the equator (RTE), the horizontal gradient (HG), the analytical signal (AS) and that of the Euler solutions (ED) to find the main magnetic facies corresponding to these structures. The geological formations of the studied area thus appear to be intensely fractured by a NE-SW (N45°E) and ENE-WSW (N70°E) main orientation fault system, the depth of which has been estimated by combining the three-analytical methods HG, AS and ED. Advanced magmatic map analysis revealed dikes associated with vertical faults in the studied area. The development of an interpretative geological map taking into account the basic geology, the deep faults, the identified dikes and the mineralization index made it possible to extract a correlation between geological structures and mineralization of the studied area. The 2.5D modelling of two magnetic profiles plotted on the reduced residual map at the equator was performed to approximate the geometry and depth of the dikes sector, which are potential sources of mineralization here.

关键词： Aeromagnetic Data Analytical Methods Faults Mineralization 2.5D Modelling

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Study of the Geothermal Potential of the Locality of Kaladi and Its Surroundings (Adamawa-Cameroon) from the Frequency Processing of Magnetic Data

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International Journal of Geosciences 2022年第11期13卷 1024-1039页

作者： ndam njikam Mohamed Moustapha Meying Arsène Zanga Amougou Alain Abdou Raouf Nkemndem Agendia Demianus School of Geology and Mining Engineering University of Ngaoundere Ngaoundere Cameroon Department of Physics Faculty of Sciences University of Douala Douala Cameroon Research Center for Deep Ocean Science and Underwater Engineering School of Resources and Geosciences China University of Mining and Technology (CUMT) Xuzhou China Department of Geography University of Buea Buea Cameroon

The aim of this study is to estimate the variations in curie point depth, geothermal gradient and heat flux from the frequency analysis of magnetic data in order to evaluate the geothermal potential of the Kaladi locality and its surroundings. For this purpose, the magnetic field map was first reduced to equator (RTE). The centroid method was used to divide the RTE grid into a set of 40 blocks. The spectral analysis applied to each block allowed determining the depth to top (Zt), center (Z0) and bottom (Zb also called curie point depth or CPD) of the magnetic sources. Knowing the different CPD, the geothermal gradient associated with each block was calculated. The heat flow was then calculated from the geothermal gradient associated with the anomaly block considered. From the set of values obtained for each block, maps of geothermal gradient and heat flow variations were established. Analysis of these maps shows that the sectors that could be favourable for geothermal exploration are the north of Kaladi and the Goro-Bembara corridor, because they show variations in the geothermal gradient and heat flow between 0.4 and 0.8℃/m and between 1.2 and 2 mW/m2 respectively. In addition, the superposition of the different hot springs highlighted in previous studies with areas of high geothermal gradient and heat flow values supports this analysis. The proposed models can be used as background documents for any geothermal exploration project in the study area.

关键词： Spectral Analysis Curie Point Depth Heat Flow Geothermal Gradient

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Aeromagnetic Imagery as a Tool to Help Identify the Structures Controlling the Emplacement of the Kenieba Kimberlite Pipes (Western Mali, West African Craton)

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Open Journal of Geology 2023年第11期13卷 1177-1194页

作者： Baco Traore Gbele Ouattara Marc Ephrem Allialy Ousmane Wane Mohamed Moustapha ndam njikam Adama Youssouf Kone Souleymane Sangare Civil Engineering Geosciences and Geographic Sciences Laboratory Yamoussoukro C&#244te d’Ivoire Bamako Mali UFR-STRM University of Cocody Abidjan C&#244te d’Ivoire Laboratory of Mineralogy and Petrology Faculty of Sciences and Techniques University of Sciences Techniques and Technologies of Bamako Bamako Mali School of Geology and Mining Engineering University of Ngaoundere Ngaoundere Cameroon Faculty of Sciences and Technics (FST) University of Sciences Technics and Technologies of Bamako (USTTB) Bamako Mali

A kimberlite field, represented by fertile and sterile kimberlite pipes (chimneys) is located in the region of Kenieba (West Mali, Kédougou-Kenieba inlier, West African Craton). Thirty pipes and kimberlite dykes have been identified in the birimian formations, composed mainly of metasediments and granitoids, covered by sedimentary formations (sandstones and conglomerates) of Neoproterozoic age. All these formations are injected with dykes and doleritic sills of Jurassic age. The study of kimberlite pipes is still stammering in Mali, and thus no previous study has allowed to characterize the structures controlling their implementation. The reinterpretation of aeromagnetic data validated by field work indicates that the major structures of the Kenieba region are oriented NNE-SSW, NE-SW, E-W and NW-SE. These structures (faults and kimberlite pipes) are often associated with dolerite dykes, which would imply an injection of dolerite magma into the other formations. The location of the known kimberlite pipes makes it possible to say that the direction NW-SE is the most favorable for the exploration of kimberlites in the region of Kenieba.

关键词： Kimberlite Pipes Doleritic Dykes Fractures Aeromagnetism Kenieba Mali

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