TITLE:
Applying Source Parameter Imaging (SPI) to Aeromagnetic Data to Estimate Depth to Magnetic Sources in the Mamfe Sedimentary Basin
AUTHORS:
Eric N. Ndikum, Charles T. Tabod
KEYWORDS:
Mamfe Basin, Aeromagnetic Data, Source Parameter Imaging (SPI), Depth to Magnetic Sources
JOURNAL NAME:
International Journal of Geosciences,
Vol.15 No.1,
January
26,
2024
ABSTRACT: Aeromagnetic data over the Mamfe Basin have been
processed. A regional magnetic gridded dataset was obtained from the Total
Magnetic Intensity (TMI) data grid using a 3 × 3 convolution (Hanning) filter
to remove regional trends. Major similarities in magnetic field orientation and
intensities were observed at identical locations on both the regional and TMI
data grids. From the regional and TMI gridded datasets, the residual dataset
was generated which represents the very shallow geological features of the
basin. Processing this residual data grid using the Source Parameter Imaging
(SPI) for magnetic depth suggests that the estimated depths to magnetic sources in the basin range from
about 271 m to 3552 m. The highest depths are located in two main locations
somewhere around the central portion of the study area which correspond to the
area with positive magnetic susceptibilities, as well as the areas extending
outwards across the eastern boundary of the study area. Shallow magnetic depths
are prominent towards the NW portion of the basin and also correspond to areas
of negative magnetic susceptibilities. The basin generally exhibits a variation
in depth of magnetic sources with high, average and shallow depths. The
presence of intrusive igneous rocks was also observed in this basin. This
characteristic is a pointer to the existence of geologic resources of interest
for exploration in the basin.