Abstract
The paper presents results of radiometric investigations of an area (Duku-Tarasa) near the capital city of the State of Birnin Kebbi, NW Nigeria. The area of study is about 440 m × 420 m and encloses an Escarpment Feature/Structure on a sedimentary rock generally referred to as the Gwandu Formation. The Gwandu Formation (though not described in the paper) consists of continental lacustrine sediments and is the youngest Palaeogene Formation present in the Sokoto sector of the larger Iullemmeden Basin. The study measured, along some selected profiles across this escarpment feature, radiometric signatures using a Sim-Max G411 portable field gamma-ray spectrometer (giving counts for U, Th and K relative to the background values over the area), the ground total-field magnetic data (using the proton precession magnetometer) along those profiles and collected some (5) rock samples for flame photometry and AAS analyses towards the target proposition. Activity concentration levels due to potassium (K), uranium (U) and thorium (Th) were measured in the area along the five established profiles spaced at 50 metres. The results from these measurements and analyses were displayed (in Tables/histograms and gray level maps/images of concentrations of Uranium, Thorium and Potassium prospects) and interpreted (dismissing the magnetic data as seemingly passive as no filter was applied to the mapped data).
Highlights
In Nigeria Already, the initial stage in the large scale exploration for the radio-element was launched when high sensitivity aero-radiometric surveys were carried out in 1975
Activity concentration levels due to potassium (K), uranium (U) and thorium (Th) were measured in the area along the five established profiles spaced at 50 metres
The results from these measurements and analyses were displayed and interpreted
Summary
In Nigeria Already, the initial stage in the large scale exploration for the radio-element was launched when high sensitivity aero-radiometric surveys were carried out in 1975. The work of [1] [2] [3] [4] [5] who carried out detailed Investigation of radiometric anomalies in the Sokoto Basin, Bisichi, Jingir and Kakuri areas of Sokoto, Plateau and the Kaduna States respectively, forms a very important step for a large scale exploration of uranium and allied minerals. Anomalies recorded form the survey can be investigated to determine their worth regarding their uranium (u) and allied follower-up held part of Gwandu ridge escarpment features to one of such anomalies Birnin Kebbi sheet (49), in the Sokoto basin. The investigation was carried out with the aim of ground follow-up of radiometric measurements and Assay of rocks analysis over an escarpment features Gwandu ridge to characterize the anomaly in terms of its Uranium (U) prospect. The results obtained from this study can be used to characterize the results from other anomalous areas (the Gwandu ridges) [9]
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