Geophysical and geological investigation of the spatial and subsurface extent of the Segwagwa and Masoke igneous ring complexes in southeast Botswana: Geotectonic implications

Matende, Kitso N.; Ranganai, Rubeni T.; Mickus, Kevin L.; Lelièvre, Peter G.; Mapeo, Read Brown Mthanganyika; Ramotoroko, Calistus

doi:10.1016/j.jafrearsci.2022.104766

Cited by 3 publications

(1 citation statement)

References 39 publications

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“…For analysis of correlation and links between diverse geologic and geophysical variables, matched feature points and continued fields represented on the maps should maintain similar regional appearance as well as relative spatial relationships with other processes, e.g., variation in topography or geoid and regional distribution of the geologic units. Analysis of correlation between geophysical and geological variables has extensive uses in integrated geophysical and seismic analysis [1], hydrological and engineering geological studies [2][3][4], geophysical anomalies [5], mineral exploration [6], or landslide hazard risk assessment in the areas with complex geology [7,8].…”

Section: Introduction 1backgroundmentioning

confidence: 99%

Coherence of Bangui Magnetic Anomaly with Topographic and Gravity Contrasts across Central African Republic

Lemenkova

Debeir

2023

Minerals

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The interactions between the geophysical processes and geodynamics of the lithosphere play a crucial role in the geologic structure of the Earth’s crust. The Bangui magnetic anomaly is a notable feature in the lithospheric structure of the Central African Republic (CAR) resulting from a complex tectonic evolution. This study reports on the coherence in the geophysical data and magnetic anomaly field analysed from a series of maps. The data used here include raster grids on free-air altimetric gravity, magnetic EMAG2 maps, geoid EGM2008 model and topographic SRTM/ETOPO1 relief. The data were processed to analyse the correspondence between the geophysical and geologic setting in the CAR region. Histogram equalization of the topographic grids was implemented by partition of the raster grids into equal-area patches of data ranged by the segments with relative highs and lows of the relief. The original data were compared with the equalized, normalized and quadratic models. The scripts used for cartographic data processing are presented and commented. The consistency and equalization of topography, gravity and geoid data were based using GMT modules ‘grdfft’ and ‘grdhisteq’ modules. Using GMT scripts for mapping the geophysical and gravity data over CAR shows an advanced approach to multi-source data visualization to reveal the relationships in the geophysical and topographic processes in central Africa. The results highlighted the correlation between the distribution of rocks with high magnetism in the central part of the Bangui anomaly, and distribution of granites, greenstone belts, and metamorphosed basalts as rock exposure. The correspondence between the negative Bouguer anomaly (<−80 mGal), low geoid values (<−12 m) and the extent of the magnetic anomaly with extreme negative values ranging from −1000 to −200 nT is identified. The integration of the multi-source data provides new insights into the analysis of crustal thicknesses and the average density of the Earth in CAR, as well as the magnitude of the magnetic fields with notable deviations caused by the magnetic flux density in the Bangui area related to the distribution of mineral resources in CAR.

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Section: Introduction 1backgroundmentioning

confidence: 99%

Coherence of Bangui Magnetic Anomaly with Topographic and Gravity Contrasts across Central African Republic

Lemenkova

Debeir

2023

Minerals

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Geology from aeromagnetic data

Betts,

Moore,

Aitken

et al. 2024

Earth-Science Reviews

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Geothermal Resource Mapping in Northern Botswana Inferred from Three-Dimensional Magnetotelluric Inversion

Ramotoroko,

Thiede,

Junge

et al. 2023

Applied Sciences

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A set of magnetotelluric (MT) data collected from 28 stations at the Kasane Hot Spring in northern Botswana was used to derive a 3-D model of the electrical resistivity distribution around deep geologic structures that we associated with geothermal resources. The dimensionality analysis results revealed that 3-D modeling should be used to determine the electrical structure. The resistivity models revealed a conductive layer with an average thickness of 200 m, representing the overlying sediments of the Proterozoic volcanic rocks. The thick high-resistivity zone (>100 Ωm) below the conductive layer can be associated with Mesoproterozoic bedrock. The MT measurements in this area show a tube-shaped conductive anomaly that could serve as a fluid pathway feeding the hot spring. A fracture-controlled meteoric fluid circulation presumably determines the existence of the Kasane Hot Spring system.

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Geophysical and geological investigation of the spatial and subsurface extent of the Segwagwa and Masoke igneous ring complexes in southeast Botswana: Geotectonic implications

Cited by 3 publications

References 39 publications

Coherence of Bangui Magnetic Anomaly with Topographic and Gravity Contrasts across Central African Republic

Coherence of Bangui Magnetic Anomaly with Topographic and Gravity Contrasts across Central African Republic

Geology from aeromagnetic data

Geothermal Resource Mapping in Northern Botswana Inferred from Three-Dimensional Magnetotelluric Inversion

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