THE GEOLOGY, GEOCHEMISTRY AND GENESIS OF URANIUM MINERALIZATION AT DINYA - KOKING N.E. NIGERIA
THE GEOLOGY, GEOCHEMISTRY AND GENESIS OF URANIUM MINERALIZATION AT DINYA - KOKING N.E. NIGERIA
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Date
1992-12
Authors
NAJIME, TAVERSHIMA
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Abstract
The geology of Nigeria indicates possible areas of uranium mineralization. Radiometric anomalies have been found both within the sedimentary basins and the basement
complex. The Dinya-Koking area is one of these areas that have radiometric values above 5000 C.P.S.. The area falls
within the Proterozoic basement rocks east of the Cretaceous Benue sedimentary basin.. Emplaced within the basement rocks are rhvolitic rocks of Cenozoic age. The
rhyolite dykes lie along a North-South lineaments believed to be shear zones. The high radiometric values are found
to be closely associated with the rhyolitic bodies., Alterations of rocks occur at the contact of the basement granites and rhyolites.. The alterations indicate
secondary processes, which were due to the action of hydrothermal solution during or/and after the emplacement
of the rhyolites.
vii The action of the hydrothermal solution is concentrated along the contact and shear zones which acted as channelways along which the fluid circulated.. Intact the shear zones and fractures were also the deep seated structures through which the supercritical fluid circulated and scavaged uranium and other metals that tend to be enriched together with Uranium.. The mineralizing fluid itself was generated by the magmatic activity due to
gravitation and crystallization fractionazation- Geochemistry of the rock samples reveals a constant depletion of the rock forming oxides Cao, mgo and Na?o but. enrichment of uranium, potassium and other metals.. The enrichment and depletion trend match closely to the element correlation and element associations.. The trend of elements point to the fact that the mineralizing
fluid was rich in uranium., Cr» Ni, Cu, Zn„ Fe, mn and P.. The presence of Ni and Fe in the mineralizing solution confirms its association with the volcanic activity that led to the rhvolites emplacements, while the
association of uranium and the I. ithophil.es must, be due to leaching and concentration in the hydrothermal solutions
Description
THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL
AHMADU BEL LO UNIVERSITY, IN PARTIAL FULFILLMENT
OE THE REQUIREMENTS FOR THE DEGREE OF
MASTER OF SCIENCE (GEOLOGY)
Keywords
GEOLOGY, GEOCHEMISTRY, GENESIS, URANIUM, MINERALIZATION, DINYA - KOKING, NIGERIA