Implications of tectonic anomalies from potential field data in some parts of Southeast Nigeria

Abstract

Tectonic structures controlling mineralization in some parts of Southeast Nigeria were evaluated using airborne potential field data. High and low frequency filters and depth determination tools were adopted to evaluate short and long wavelength anomalies, resolve the spatial spreading of igneous intrusions, depths to geologic sources and basin topography. The high frequency results exhibited high concentration of short wavelength anomalies in the Obudu Plateau and Ikom-Mamfe Rift. The underlying main tectonics of the area elucidated by the low frequency results caused the widespread occurrences of short wavelength geologic structures that are revealed by the high frequency maps. The study area is characterized by comparatively thin (~13.0 to <3000 m) sedimentation. The observed thin thickness is as a result of the massive Precambrian basement outcrops in some locations in the Obudu Plateau and the proliferation of igneous intrusions within this part of the Lower Benue Trough. The 2-D models showed the undulating nature of the underlying basin topography, the location of intrusions, domal structures and related normal faults. The locations and neighbourhood of intrusions and/or short wavelength structures are viable sites for lead-zinc-barite, brine and metallogenic minerals.

Depth Estimation of Sedimentary Sections and Basement Rocks in the Bornu Basin, Northeast Nigeria Using High-Resolution Airborne Magnetic Data

“…These igneous invasions were detected by SPI and St-ED (Figure 4), as well as analytic signal and upward continuation enhancements (Figure 8). Geologic structures caused by intrusions in such regions are the potential pathway for hydrothermal fluid migration and mineralization in rift environments [18,34,64,[77][78][79] like the Bornu Basin. However, Figure 8b revealed E-W anticlinal structures (red-pink colour) adjoined by a trough-like structure (lemon green-blue colour) located at the southern and northern parts of the study area, respectively.…”

Direct Detection of Groundwater Accumulation Zones in Saprock Aquifers in Tectono-Thermal Environments

“…Post-Santonian tectonic disturbances resulted in younger granitic rocks such as syenites, diorites, trachytes, and basalts being emplaced in Cretaceous sediments, thereby distorting their physical, lithological, mechanical, chemical and structural states [43][44][45][46][47][48]. The sources of these magmatic activities have been traced to low-grade tectonic activities originating from the Cameroun Volcanic Line [49] and post-Santonian tectonic disturbances [50][51][52]. However, recent studies have shown that these disturbances did not reach parts of the Calabar Flank because the Guinea Ridge blocked their southward continuity [53][54][55].…”

Utilisation of new media in communicating insecurity in Southeast Nigeria

“…Southeast residents are always looking out for information that will enable them averts danger owing to the incessant security issues in almost all the parts of the region (Ekwok et al, 2022). In this situation the media have an important role to play towards helping southeastern residents in accessing information about insecurity (Ogbuanya et al, 2021).…”