GEOLOGY AND GEOCHEMISTRY OF URANIUM MINERALIZATION IN MIKA N. E. NIGERIA
GEOLOGY AND GEOCHEMISTRY OF URANIUM MINERALIZATION IN MIKA N. E. NIGERIA
| dc.contributor.author | IDRIS, ISA FUNTUA | |
| dc.date.accessioned | 2014-02-06T12:19:46Z | |
| dc.date.available | 2014-02-06T12:19:46Z | |
| dc.date.issued | 1992-09 | |
| dc.description | A thesis submitted to the Postgraduate School, Ahmadu Bello University, in partial fulfillment of the requirements for the degree of Ph. D. (Geology). Department of Geology Faculty of Science Ahmadu Bello University Zaria September, 1992 | en_US |
| dc.description.abstract | The Mika uranium mineralization is located near Zing in Taraba State, N.E. Nigeria. The host rock consists of a sheared Pan-African medium grained biotite granite which is in places intruded by rhyolites and siliceous veins. These are criss-cut by numerous joints, faults and fractures which are filled by hematized silica. The ore occurs in two parallel N-S trending shear zones with the western limb hosting a rhyolite body. Drill section reveal a subsurface extension of the above. In the upper limb mineralization consisting of meta-autinite occurs associated with the rhyolite body. In the lower ore limb pitchblende and coffinite occur along a set of two parallel shear surfaces. The pitchblende occurs massive and as veinlets in hematized rocks in association with sulphides. The ore body is marked by distinct hydrothermal alteration zones which feature serlcitization, si1icification, K-feldspathization, hematization and kaolinization. Three hundred rock samples consisting of host rocks and ores from surface and drill cores each of which was analysed for 25 elements using Neutron Activation Analysis, Natural activity counting and Radioisotope X-ray fluorescence techniques. The elements includes Si, Tl, Al, Fe, Mn, Mg, Ca, Na, K, P, Sc, V, Cr, Ni , Cu, Zn, As,Se Rb, Sr, Y, Zr, Mo, Pb and U. The resulting data were evaluated using multivariate statistical techniques including principal component analysis. U, Fe, P, Cu, Zn, Mo and Pb have higher values than the background values. These elements form distinct dispersion aureoles around the uranium occurrence which appeared to be most pronounced on the surface, perhaps owing to weathering and remobi1ization. Some elements like Na and K are depleted in the mineralized zone in relation to the intensity of hydrothermal alteration. There are two distinct element associations in the ore zone and host rocks; the Ti20-Mg0-Ca0-K20-Co-Sr -Rb-Zr and Fe203-P20s-Cu-Zn-Mo-Pb-U. The first which reflects mineralogy of the host rock forms a large cluster that includes Fe20a, PzOs, Cu, Zn, Mo, Pb and U in the altered granites and rhyolites. This is fragmented into the two associations above in the mineralized rocks. The latter group, Fe203-P205-Cu-Zn-Mo-Pb-U is a product of remobi1ization of the former and reflects the mineralogy of the ores. vii Structures played an important role in the formation of the Milka mineralization, as channel and or mechanical barrier. These structures are reactivated lineaments that are related to regional structures, which have undergone a prolonged history of geological development and several periods of activity. The bimodal magmatism of the Burashika group is postulated to be related to the uranium mineralization, from the consistent presence of rhyolite bodies to the mineralization. The role of the magmatic is most likely the source of heat and the driving force of the mineralization fluid and sometimes as well as mechanical barrier for the fluids leading to the formation of the mineralization | en_US |
| dc.identifier.uri | http://hdl.handle.net/123456789/502 | |
| dc.language.iso | en | en_US |
| dc.subject | GEOLOGY, | en_US |
| dc.subject | GEOCHEMISTRY, | en_US |
| dc.subject | MINERALIZATION, | en_US |
| dc.subject | MIKA,, | en_US |
| dc.subject | NIGERIA | en_US |
| dc.title | GEOLOGY AND GEOCHEMISTRY OF URANIUM MINERALIZATION IN MIKA N. E. NIGERIA | en_US |
| dc.type | Thesis | en_US |