OCCURRENCE OF A RADIOACTIVE GRANITE COMPLEX IN IDOGUN/IDOANI DISTRICT, ONDO STATE, NIGERIA: A HDR GEOTHERMAL ENERGY RESOURCE POTENTIAL

BY

ADEGBUYI, O. (MNMGS)

Department of Geological Sciences, College of Natural and Applied Sciences,

Achievers University, Owo, Ondo State, Nigeria

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ABSTRACT

The occurrence of a radioactive Pan-African Older Granite Complex in Idogun/Idoani District of Ondo State, Nigeria is hereby reported. The granitoid mass is porphyritic and light coloured. It was discovered during a random radiometric ground survey of this metasedimentary region, whereby a high range of gamma counts readings of 1650-1740 cps using a Geiger Muller Counter was obtained. Consequently, twenty-five samples of the rock were collected as a follow-up at different locations on the complex for radiochemical analysis using Atomic Absorption Spectrometry (AAS) method. The ranges of concentrations obtained in the analysed samples (65.11 – 68.25ppm U and 9.95 – 33.00ppm Th) are considerably high and quite comparable with the range of average values (4.90 – 10.00ppm U and 24.82 – 50.00ppm Th) obtained for known “hot” granitoids already being exploited for HDR geothermal power production in developed nations. Moreover, such high rock radioactivity in granitoids will impact very hazardous health effects due to radiation on man and animals consuming farm products and polluted groundwater from the immediate environment.

 

KEYWORDS: Pan-African, granite, radiochemical, geothermal, groundwater.