Reconnaissance soil-gas radon survey over the faulted crystalline area of Ile-Ife, Nigeria |
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Authors: | T Ajayi A Adepelumi |
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Institution: | Department of Geology, Obafemi Awolowo University, Ile-Ife, Nigéria, Departamento de Geofísica, Observatório Nacional, Rua Gal José Cristino 77, CEP 20921-400, S?o Cristóv?o, Rio de Janeiro, Brazil,
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Abstract: | Tropical rain forest areas are well known for problems with geological mapping because of the dense vegetation and thick overburden. The application of soil-gas radon measurements was carried out over known and suspected fault zones in the basement terrains of Ile-Ife, southwestern Nigeria. Radon concentration in the area ranged from 25.6 to 6,227.8 pCi/l, with distinct contrasts and overlap in concentrations among soil groups derived from various rock types. Radon concentrations in the soil exhibit a strong dependence on the local geology and reflect the bedrock geochemistry. Relatively high radon soil-gas concentrations of between 4,000 and 6,227.8 pCi/l were found directly on the axis of the known and suspected strike slip faults. The use of the radon-222 technique confirms its application as a useful tool in geological and structural mapping in basement terrains largely covered by relatively thick overburdens. |
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