Petrography and Structural Characterization of rocks around Ragga part of Kura sheet 189 SW North-Central Nigeria

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Article 17 (Nov 2016).pdf (1.57 MB)

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2016-11-17

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Department of Geology and Mining, Nasarawa State University, Keffi

Abstract

The result of the mapping shows that the study area is underlain by the Basement Complex rocks comprising of gneisses, amphibolite, pegmatite and basalt. These host rocks are intruded by pegmatitic, quartz or quartzo-feldspathic veins. Petrographic studies show that the gneisses contain mainly quartz, plagioclase feldspar, muscovite and hornblende. The main minerals in the basalts are phenocrysts of pyroxene, plagioclase, magnetite and groundmass of clinopyroxene. The pegmatite mostly trends in a NE-SW and is mainly made up of quartz, plagioclase and muscovite. Petrographic studies showed that the granite gneiss contains mainly quartz, plagioclase feldspar, muscovite, hornblende and chlorite while the biotite gneiss revealed quartz, plagioclase feldspar, biotite, muscovite, microcline and hornblende. Meanwhile the pegmatites contain mainly quartz, plagioclase, microcline and muscovite with little or no trace of mineralization. The noticeable structures within the rocks in the area include foliation (NE-SWVS), fractures and faults (NE-SW, E-W, NNW-SSE), veins in pegmatite (NE-SW), lineation (NWSE), joints folds and minor faults (N-W, NNE-SSW) that show cataclasis. These structural patterns could be useful in zone of mineralization, mineral concentration and control.

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Mineralization, petrography, structural characterization, plane and cross polarized light

Citation

Adefolalu, A.D. (2002). Climate in Africa Atlases; Atlas of Nigeria. Les Editions J.A. Aux Edition du jaguar 57 bis, rue d'Auteuil- 75016 Paris-Francis. Aga, T. Atane, G., and Baba, J. (2012). The Geology and Geotourism Potential of the Mayes Water Fall, North Central Nigeria. Global Advanced Research Journal of Geology and Mining Research Vol. 1 (1), pp. 007-013. Annor, A. E., Olasehinde P. I., and Pal, P. C. (1990). Basement fracture patterns in the control of water channels - An example from central Nigeria. J. Min. Geol., 26(1): 5-12. Annor, A.E. and Freeth, S.J. (1 985). Thermotectonic evolution of the Basement Complex around Okene, Nigeria with special reference to deformation mechanism, Precambrian Research, 28, pp. 269-281. Federal Surveys Nigeria (1967). Topographical map of Kurra S.W. (Sheet 189SW) on a scale of 1:50,000. Jatau S.B.OIoniniyi, L.T. and Tanko Y. 1.(2012). Rock analysis investigation at Ragga and Environs part of Kura sheet 189SW North- Central Nigeria. Book of proceeding of Kwara AGM/Conference. Nigerian Society of Mining Engineers (NSME) PP70-76

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https://keffi.nsuk.edu.ng/handle/20.500.14448/5665

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