Gold potential of the Pan African Trans-Sahara belt and prospect for further exploration

Fagbohun, Babatunde Joseph; Omitogun, A A; Bamisaiye, Oluseyi Adunola; Ayoola, Femi J.

doi:10.1016/j.oregeorev.2019.103260

Cited by 9 publications

(6 citation statements)

References 83 publications

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“…That said, our results provide the best compilation of intermediate magnitude focal mechanism solution extending inland away from the passive margins. This caveat noted, we argue for our preferred solution based on the good correspondence with the observed faults in the regions (Caby & Bruguier, 2018;Fagbohun et al, 2020). Also, the self-consistency within the different clusters of seismicity reinforces the plausibility of our preferred solutions.…”

Section: Current Limitations and Future Worksupporting

confidence: 61%

“…Several other rift segments and their brittle structures run through the platform beneath the Taoudeni Basin, the Trans-Saharan Mobile Belt, and the Western edge of the Sahara Metacraton (Figure 1b) (Albert-Villanueva et al, 2016;Begg et al, 2009;Caby et al, 1981). The Trans-Saharan Mobile Belt hosts earthquakes that are located along Precambrian shear zones, active during the Mesozoic strike-slip system in the region (Figure 1b) (Black et al, 1994;Caby & Bruguier, 2018;Fagbohun et al, 2020;J. Fairhead, 2023).…”

Section: Geologic Setting Of Earthquakes In West Africamentioning

confidence: 99%

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The Intraplate Stress Field of West Africa

Legre,

Qin,

Kolawole

et al. 2023

Preprint

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West Africa continues to host a growing number of low and intermediate-magnitude earth- quakes (M2-5) along its passive margins, and its continental interior. Earthquake activity in these regions raises the need to comprehend the causes and the tectonic controls of the seismicity. Unfortunately, such studies are rare. Here, we apply single-station inversion techniques to constrain fourteen focal mechanisms, computed after compiling a set of high- quality waveforms. We describe the connection between seismicity, the contemporary stress field, anthropogenic activity, and Holocene fault scarps in the region. Our results indicate transpressive stresses acting on the inherited brittle structures in the passive margins. We also observe a compressive regime in the intracontinental failed rifts. We attribute the seismicity to the reactivation of ‘weak’ faults in the Neoproterozoic and Mesozoic failed rifts, the passive transform structures, and the intracratonic Precambrian brittle shear zones.

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Section: Current Limitations and Future Worksupporting

confidence: 61%

Section: Geologic Setting Of Earthquakes In West Africamentioning

confidence: 99%

The Intraplate Stress Field of West Africa

Legre,

Qin,

Kolawole

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Several other rift segments and their brittle structures run through the platform beneath the Taoudeni Basin (TB1) , the Trans‐Saharan Mobile Belt (TSMB) , and the Western edge of the Sahara metacraton (SMC) (Figure 1b) (Albert‐Villanueva et al., 2016; Begg et al., 2009; Caby et al., 1981). The TSMB hosts earthquakes that are located along Precambrian shear zones, active during the Mesozoic strike‐slip system in the region (Figure 1b) (Black et al., 1994; Caby & Bruguier, 2018; Fagbohun et al., 2020; J. Fairhead, 2023).…”

Section: Geologic Setting Of Earthquakes In West Africamentioning

confidence: 99%

The Intraplate Stress Field of West Africa

Legre,

Qin,

Kolawole

et al. 2024

Geophysical Research Letters

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West Africa continues to host a growing number of low and intermediate‐magnitude earthquakes (M2‐5) along its passive margins, and its continental interior. Earthquake activity in these regions raises the need to comprehend the causes and the tectonic controls of the seismicity. Unfortunately, such studies are rare. Here, we apply single‐station inversion techniques to constrain fourteen focal mechanisms, computed after compiling a set of high‐quality waveforms. We describe the connection between seismicity, the contemporary stress field, anthropogenic activity and Holocene fault scarps in the region. Our results indicate transpressive stresses acting on the inherited brittle structures in the passive margins. We also observe a compressive regime in the intracontinental failed rifts. We attribute the seismicity to the reactivation of “weak” faults in the Neoproterozoic and Mesozoic failed rifts, the passive transform structures, and the intracratonic Precambrian brittle shear zones.

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“…The study area is parts of the Precambrian Basement Complex of Southwester Nigeria -a prolongation of the reactivated Pan-African mobile belt, which lies east of the West African Craton and northwest of the Congo-Gabon Craton [20,21,22,23,24], Figure 1a. The Southwestern Basement Complex of Nigeria comprises three major rock suites, namely the Migmatite-Gneiss Complex, the Schist belt, and the Older Granitoid.…”

Section: Location and Geological Setting Of The Study Areamentioning

confidence: 99%

“…The Southwestern Basement Complex of Nigeria comprises three major rock suites, namely the Migmatite-Gneiss Complex, the Schist belt, and the Older Granitoid. The Migmatite-Gneiss Complex rocks range in age from Neoproterozoic to Paleoproterozoic and Archean [20,21,22]; the Neoproterozoic Schist Belts, consisting of low-grade, younger metasedimentary, and metavolcanic rocks with ages ranging between 690 and 489 Ma [21,24,25], and the Pan-African Older Granites, which intruded the two earlier lithologies, have ages ranging between 650 and 580 Ma [25,26,27,28].…”

Section: Location and Geological Setting Of The Study Areamentioning

confidence: 99%

Geohydraulic characteristics and groundwater vulnerability assessment of tropically weathered and fractured gneissic aquifers using combined georesistivity and geostatistical methods

Akingboye

2022

J. Nig. Soc. Phys. Sci.

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Sustainable groundwater yield in aquifers depends on the protective capacity of the subsurface lithologies and conduit systems. Electrical resistivity tomography (ERT) and its Schlumberger vertical electrical sounding (VES) technique were employed to assess the groundwater yield of aquifer units and their vulnerability to contaminants in Araromi (Akungba-Akoko), southwestern Nigeria. Geohydraulic parameters: aquifer resistivity (\rho0), hydraulic conductivity (K), transmissivity (T), permeability (\Psi), hydraulic resistance (KR), and longitudinal conductance (S) were also evaluated. In addition, regression analysis was utilized to establish the empirical relationships between the K and other geohydraulic parameters, with their percentage contributions to posing vulnerability risk. The georesistivity results revealed four distinct layers: topsoil, weathered layer, partially weathered/fractured bedrock unit, and fresh bedrock. The K model regression-assisted analysis showed that the \rho, T, \Psi, and S contributed about 97.8%, 14%, 99.9%, and 11.5%, respectively, to the estimated aquifers’ K values for the study area. Except for T and S, the regression results had moderate to strong positive correlations with K; hence, this illuminates the essentiality of K in assessing groundwater potential and vulnerability. The aquifer units have low to moderate groundwater yield based on T values (1.67-17.57 m/day) caused by the generally thin overburden (<4 m). However, the deep-weathered and fractured aquifer units with depths ranging from 39-55 m could supply high groundwater yield for sustainable abstraction. The estimated S values (0.0226-0.1926 mhos) for aquifer protective capacity ratings rated the aquifer units in the area as poor to weak. Based on the estimated low logarithm of KR (log KR) values of 0.79-2.25 years, these aquifers have extremely high to moderate aquifer vulnerability index. As a result, prospective wells/boreholes in the study area and settings with similar geohydraulic and vulnerability characteristics should be developed adequately to prevent the infiltration of surface contaminants for potable groundwater abstraction.

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Gold potential of the Pan African Trans-Sahara belt and prospect for further exploration

Cited by 9 publications

References 83 publications

The Intraplate Stress Field of West Africa

The Intraplate Stress Field of West Africa

The Intraplate Stress Field of West Africa

Geohydraulic characteristics and groundwater vulnerability assessment of tropically weathered and fractured gneissic aquifers using combined georesistivity and geostatistical methods

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