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Characterization of lithological zones of the Isanlu sheet 225, North Central Nigeria, using aerogeophysical datasets

Akinsunmade Akinniyi, Nguyen Dinh Chau, Wojas Anna, Tomecka-Suchoń Sylwia

Acta Geophysica

2020

Vol. 68, no. 3

651--665

Gridded aeromagnetic and aeroradiometric datasets of Isanlu sheet 225 were processed and interpreted in order to map the geological structures and characteristic lithology, as well as potential mineral ore zones in the area. Recorded aeromagnetic data were reduced to the magnetic equator before fltering operations which enhanced the magnetic anomalies. Analytic signal map was created, and subsequently a model was generated along a selected profle for better interpretation of the subsurface materials. On the aeroradiometric data were performed both enhancement and statistical operations. The lithological zones were identifed. They are metasedimentary rocks, migmatites and igneous rocks occupying varying proportions within the entire area. Some potential radioactive or precious metal ore zones were also localized. A major structure interpreted in the study area trends in the SE–NW direction. Other surface structures were also delineated and general orientation was evaluated. This information may serve as a valuable database for further prospective research and mineral exploration in the region.