Applied Geophysics http://irepo.futminna.edu.ng:8080/jspui/handle/123456789/64 2026-04-29T22:13:43Z 2026-04-29T22:13:43Z Olorogun, D. Adedokun, I. O. Lawrence, J. O. Udensi, E. E. http://irepo.futminna.edu.ng:8080/jspui/handle/123456789/30584 2026-04-23T17:23:53Z 2026-02-17T00:00:00Z

Title: Aeromagnetic Investigation of the Subsurface Structures in Parts of Bayelsa State, Nigeria Authors: Olorogun, D.; Adedokun, I. O.; Lawrence, J. O.; Udensi, E. E. Abstract: The aeromagnetic study presented here covers 4° to 5° N latitude and 5.30° to 6.30° E longitude in the Niger Delta region. The Reduced to Equator (RTE) magnetic map offers a spatial visualization of magnetic field variations, with high-intensity magnetic intensities in the east-central and south-western sectors suggesting the presence of magnetite-rich mafic or ultramafic rocks, while low-intensity zones in the west-central region likely indicate non-magnetic sedimentary layers or deep basement rocks. This differentiation aids in interpreting subsurface lithology’s and geological boundaries. Depth estimation techniques, including Euler DE convolution, with depth ranging from 1000 m to 7500 m, Source Parameter Imaging (SPI), and Spectral Analysis, in the study further elucidate the structural and stratigraphic framework. SPI reveals source depths exceeding 3.0 km, suggesting significant sedimentary cover crucial for hydrocarbon generation. Spectral analysis indicates magnetic basement depths ranging from 2.9 km to over 5.3 km, particularly in central and south-eastern sectors, highlighting potential hydrocarbon-rich sedimentary basins. The First Vertical Derivative (FVD) map shows passage of the Charcot paleo-fracture zone through the area. However, there are no outstanding minor fault to indicate that the paleo fracture is still active. These datasets enhance the geological understanding of the region, identify structurally controlled basins, and delineate favourable zones for hydrocarbon exploration and development in the Niger Delta.

2026-02-17T00:00:00Z Muhammad, A. Umar, S. Suleiman, I. K. Bashir, M. Ibrahim, A. A. Arewukewuyo, A. Lawrence, J. O. Shehu, J. Tyabo, A. M. http://irepo.futminna.edu.ng:8080/jspui/handle/123456789/30579 2026-04-22T22:52:39Z 2022-12-30T00:00:00Z

Title: GEOELECTRICAL INVESTIGATION FOR LEACHATE PLUME MIGRATION ON MAITUMBI DUMP SITE, MINNA, NIGER STATE, NIGERIA Authors Authors: Muhammad, A.; Umar, S.; Suleiman, I. K.; Bashir, M.; Ibrahim, A. A.; Arewukewuyo, A.; Lawrence, J. O.; Shehu, J.; Tyabo, A. M. Abstract: Leachate contamination due to poor solid waste management causes serious negative effects on the environment and human health. In this work, resistivity method was employed at an old dumpsite in Maitumbi, Minna, Niger State, Nigeria to study the ingress of leachate contamination into groundwater. The study area is mostly characterized by three (3) layered geologic sections, which include topsoil, weathered basement and Fresh basement. The Results indicate the ingress of leachate into the subsurface up to the depth of about 13 m. It was observed that the subsurface is contaminated by leachate migration. At the surface of the dump site, the resistivity value ranges from 20 Ωm to 40 Ωm as compared to that of the control site which ranges from 380 Ωm to 820 Ωm at the same depth. This indicates that the topsoil has been contaminated by leachate from the dump site. At 10 m depth, the resistivity value ranges from 20 Ωm to 60 Ωm at the dumpsite and that of the control site ranges from 260 Ωm to 580 Ωm. The low resistivity at this depth on the dumpsite compared to the control site further indicates the presence of leachate. At the depth of 13 m, the resistivity value at the dump site ranges from 100 Ωm to 850 Ωm and that of the control site ranges from 200 Ωm to 850Ωm. The similarity in resistivity value at this depth is indicative that the migration of leachate ends at the depth of 13 m. However, considering the weathered/fractured layer thickness map, the aquiferis observed to be promising at the depth of 20 m. This suggests that the groundwater is currently not affected by the leachate contamination. Nonetheless, the continuous migration of the leachate at the current rate of 1.63m/year, is estimated to result in the eventual contamination of the groundwater in 12.3 years. Keywords: Leachate contaminant, resistivity, landfill, aquifer, solid waste.

2022-12-30T00:00:00Z Salako, K. A. Adetona, A. A. Rafiu, A. A. Augie, A. I. Jimoh, M. O. Alkali, A. Muriana, R. A. Lawrence, J. O. http://irepo.futminna.edu.ng:8080/jspui/handle/123456789/30571 2026-04-22T19:52:21Z 2024-07-30T00:00:00Z

Title: Integrated geophysical Investigation for gold mineralization potential over southern parts of Kebbi state and its Environs, northwestern Nigeria Authors: Salako, K. A.; Adetona, A. A.; Rafiu, A. A.; Augie, A. I.; Jimoh, M. O.; Alkali, A.; Muriana, R. A.; Lawrence, J. O. Abstract: The potential zones of gold mineralization were identified in this study using aeromagnetic and aero-radiometric methods. The Nigerian Geological Survey Agency (NGSA) provided half-degree airborne magnetic and radiometric datasets covering the southern part of Kebbi State. Magnetic data were subjected to first vertical derivative (1VD), total gradient amplitude (TGA), total horizontal derivative (THD), source edge detection (SED), center for exploration targeting (CET), Euler deconvolution (ED) and source parameter imaging (SPI) to identify favourable structures to gold mineralization. Aero-radiometric data delineation of the region of hydrothermal alteration zones through the K/eTh ratio, K_deviation, F_parameters, and Ternary image analyses were successful. The results of the magnetic data techniques revealed the regions of major structures/or lineaments with gold mineralization attributes, trending in the NE to SW directions and the SE to NE parts of the study area. The depth to the structures of the magnetic source hosting gold mineralization was less than 5 m using algorithm ED and SPI techniques. Normalized radiometric data showed the area of anomalously high and moderate hydrothermal altered zones. The region's designation as a gold field is supported by major fault lines observed on the 1VD, a sequence of bristle fractures from the CET analysis, and high values of K_deviation and F_parameter, all of which are were visible on the Ternary images. The integrated results revealed zones of major structures and hydrothermal regions of gold fields at Agwara, Western Magama, Rijau, Fakai, Bukkuyum, and Borgu in the SE of the study area.

2024-07-30T00:00:00Z Alkali, A. Alhassan, U. D. Akpan, O. U. Lawrence, Jane O. Udensi, E. E. http://irepo.futminna.edu.ng:8080/jspui/handle/123456789/30569 2026-04-22T18:50:56Z 2026-02-06T00:00:00Z

Title: Integrated Aeromagnetic and Seismological Analysis of Intraplate Earth Tremors (2016-2018) in North –Central Nigeria Authors: Alkali, A.; Alhassan, U. D.; Akpan, O. U.; Lawrence, Jane O.; Udensi, E. E. Abstract: The primary aim of this study is to use High-resolution aeromagnetic and seismological data from parts of North Central Nigeria to pinpoint the causes of the earth tremors that occurred in 2016 and 2018 in the region. Techniques such as upward continuation, First Vertical Derivative (FVD), and Center for Exploration Targeting (CET) grid analyses were employed to interpret the aeromagnetic data, while the earthquake parameters derived from the seismological data were analyzed to investigate the earthquake magnitude and location of earthquake epicentre using SEISAN. Upward continuation at 5 km depth revealed the presence of deep-seated faults. Similarly, a prominent discontinuity was identified using the First Vertical Derivative (FVD) method which traverses the study area, is suspected to represent the same paleostructure (Romanche). The Center for Exploration Targeting (CET) analysis identified four major structural trends: NE-SW, NW-SE, E-W, and NNE-SSW. The epicentres of the earth tremors at Jema’a (2016) and Municipal area council (2018) were observed to coincide with the emerging fault lines labelled (F4 and F8) in the study area. The findings indicate that the paleostructures coincide with the earthquake epicentres, suggesting a tectonic origin.

2026-02-06T00:00:00Z