Radiometric Mapping of Song Area and Environs, Hawal Basement Complex, Northeast Nigeria

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Author(s) Nsikak E Bassey | Usman Kaigama | Ajibola Oluwasegun
Pages 692-699
Volume 2
Issue 9
Date September, 2013
Keywords Radiometric mapping, Precambrian basement, Song
Abstract

A ground radiometric mapping of Song area and environs in Nigeria’s northeast basement complex was done as part of on-going geo-exploration work of the area. The area lies between longitude 12035'- 12040', and latitude 9045'-9052'. It covers about 113.4 km2. Mapping was done following a regular grid with a size of 1minute (1.8 km), and a total of 35 stations were occupied. Station identification was done with aid of a GPS. Lithological data where exposed were recorded alongside radiometric data. The latter were recorded using the Gamma scout® tuned to Geiger counter mode. Gamma radiations were recorded over interval of three minutes and averaged out to give the counts per minute (cpm). The averaged data were contoured using computer software Surfer 8. Three rock groups were observed in the area namely: granitoids (granites, pegmatites and aplites), metamorphic rocks (gneisses and migmatite) and basalts. Isoradiometric anomalies reflect the general distribution of these rock groups. Significantly the anomalies align in three major directions namely N-S, NE-SW, and NW-SE.E-W anomalies are few. These are consistent with published structural data, alignment of geomorphic bodies and fluvial channels over the area. By implication the emplacement of lithologic bodies follows the structural grain in the Precambrian basement complex. The survey has enabled mapping of lithologies where outcrops are absent.

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