Application of High-Precision Filters on Airborne Magnetic Data: A Case Study of the Ogoja Region, Southeast Nigeria

Abstract

Aeromagnetic data from the Ogoja region, Southeast Nigeria, were enhanced using high-precision methods including the tilt angle of total horizontal gradient (TAHG), the softsign function (SF), and the improved logistic function (IL) with the aim of creating a new structural map. This new map can help improve the understanding of the trend, spatial distribution, and pattern of the lineaments. The TAHG, SF, and IL methods generated geologic structures with correlating trends, distributions, and patterns. However, the SF and IL techniques mapped the borders of geologic structures more precisely. The lineaments extracted from the SF and IL maps were reduced to equator (RTE) magnetic data, and a GIS was used to create structural maps with NE–SW, NW–SE, NNE–SSW, and NNW–SSE orientations. Furthermore, the depths (0–2100 m) of these geologic structures were estimated using the tilt depth technique (TDT). The high lineament density and thin sedimentation observed in the study area were triggered by the widespread Santonian igneous intrusions associated with the Abakaliki Anticlinorium. The techniques applied in our study can be employed in areas with the same conditions around the world for the precise delineation of geologic structures from magnetic and gravity data.

Utilizing remote sensing and aerogeophysical data for spatial decision support system for optimal gold mineralization site identification in North-Central Nigeria

“…Extracting lineaments was preceded by employing various enhancement techniques to process the datasets. These techniques included the utilization of Total Horizontal Gradient (THG) as depicted by Pham et al [74] and Ekwok [75] Tilt Derivative (TDR) as described by Ejepu et al [76], El Galladi et al [77], the First Vertical Derivative (FVD) as implemented by Haruna et al [78], and the application of Centre for Exploration Targeting (CET) grid analysis detailed in Holden et al [79]. These enhancement techniques were systematically applied to the residual reduced-to-the-equator (RTE) grids.…”

An integrated geophysical approach for gold from Wayand‐Nilambur granulite terrain, Kerala (India)

“…The potential field data plays a significant role in mineral exploration, because of their capability of revealing subsurface structures, that is, fracture, shear zones and fault zones. Specifically, the magnetic method has a wide range of applications in visualizing economic sources, their spatial distribution, including the depth, physical and geometric properties and recognition of related geologic structures (Abdelrahman et al, 2003; Adewumi & Salako, 2018; Ai et al, 2023; Balkaya & Kaftan, 2021; Biswas & Acharya, 2016; Biswas & Rao, 2021; Ekwok & Eldosouky, 2023; Essa & Diab, 2022; Gokula & Sastry, 2022; Lehmann et al, 2015; Mandal et al, 2020; Mehanee, 2022; Mehanee et al, 2021; Ramesh et al, 2020; Sharma, 1987). Magnetic studies can map the changes in the amount of magnetic minerals as well as associated rock types.…”

Inversion of Geomagnetic Anomalies Caused by Ore Masses Using Hunger Games Search Algorithm

“…Geomagnetic method is an effective tool in investigating magnetized geologic sources (Boukerbout et al., 2018; Ekinci, Büyüksaraç, et al., 2020; Ekinci & Yiğitbaş, 2012; Ekvok et al., 2022; Essa, Munschy, et al., 2022; Kaftan, 2017; Oruç, 2011; Pham et al., 2022; Xu et al., 2011). Additionally, it is frequently applied in economic resource explorations due to the adequate magnetization contrast between surrounding rocks and ore/mineral deposits (Bencharef et al., 2022; Biswas, 2018; Eldosouky et al., 2021; Hinze et al., 2013; Kharbish et al., 2022; Spector & Lawler, 1995).…”