TITLE:
Geological Structural Mapping Using Aeromagnetic Geophysical Data: A Case of Winneba and Its Environs, Central Region, Ghana
AUTHORS:
Daniel Oduro Boatey Nuamah
KEYWORDS:
Geological Structure, Depth Measurements, CET Grid Analyses, Source Parameter Imaging
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.14 No.8,
July
31,
2026
ABSTRACT: The aeromagnetic geophysical survey method has been applied to the Winneba area, south-eastern Ghana, to map geological structures, lithological contacts and measure the thickness of the overburden materials for mineral exploration purpose. The Centre for Exploration Targeting (CET) Grid Analysis was applied with the edge detection filters to map lineament positions while the Source Parameter Imaging (SPI) technique was used to measure spatial depths to the crystalline basement rocks at various locations to estimate overburden material thickness. The processed magnetic field intensity anomalies categorized the geology of the study area into metamorphosed sedimentary, volcaniclastic and volcanic rocks. Mapped geological contacts separating the different rock types were interpreted as boundaries of interest for mineralization. The delineated geological structures were major and minor dykes associated with volcanic intrusives. Estimated depths to the underlying hard rocks showed variations in material thickness over the study area. Deeper depth areas greater than 300 m occur to the southeast while shallower depth areas less than 150 m, were positioned along surficial mapped dykes. An intermediate depths range of 150 m-to 300 m were measured at several locations across the study area. The highest estimated depth is 753 m, located southeast, closer to the shoreline. The variations in depth measurements indicated the overburden material is thicker to the southeast compared to other parts of the study area. The mapped litho-contacts and intrusive dyke locations are proposed zones for possible mineral accumulation, hence, further exploration activities should target these areas.