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IJSTR >> Volume 4 - Issue 4, April 2015 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Field Features And Mode Of Emplacement Of Pegmatites Of Keffi Area, North Central Nigeria

[Full Text]



Tanko, I.Y., Adam, M., Dambring, P.D



Keywords: Pegmatites, emplacement, petrogenesis, characterisation and classification



Abstract: The Keffi area of North Central Nigeria hosts numerous pegmatite bodies which are related to the surrounding granitic intrusions islocated about 45 km east of the Federal Capital Territory, Abuja Nigeria. Petrological investigation of the pegmatites and surrounding host rocks aimed at characterising and understanding field relations and mode of emplacement of the rocks with a view to assess their mineralisation potentials were carried out. From the field observations the pegmatites were characterised into: (1) Pelitic schist-amphibolite hosted pegmatites and (2) Granitoids (orthogneisses) hosted pegmatites, and the granites into (1) the Bakin Ayini (biotite) granites, (2) the Angwan Madugu (biotite-muscovite) granites and (3) the Sabongida (biotite-muscovite) granites. It is clear that those discordantly emplaced in pelitic schists varied in shape and size with length and width ranging from (400-2000m) and (2-20m) respectively, some are huge, isolated, sill-like and flat-lying, whilst those hosted in orthogneisses are narrow, ranging in length (40-1000m) and width (1-4m), crosscutting and vertically oriented along shear zones, which suggest passive emplacement



[1] Adekeye, J. I. D. and Akintola, O. F. (2007), “Geochemical Features of Rare Metal Pegmatites in Nasarawa Area, Central Nigeria”, Journal of Mining and Geology, Vol. 43, No. 1, pp. 15-21.

[2] Ajibade, A. C., Woakes, M. and Rahaman, M. A. (1989), “Proterozoic Crustal Development in the Pan-African Regime of Nigeria”, In C. A. Kogbe (Eds.),Geol. Nigeria, 2nd Revised Eds., Elizabethan Publ., Lagos, pp. 57- 69.

[3] Akintola, O. F., and Adekeye, J. I. D. (2008b), “Mineralisation Potentials of Pegmatites in the Nasarawa Area of Central Nigeria”, Earth Sci.Res. J., Vol.12, No. 2, pp. 213-234.

[4] Almeida, A. (2007), Ore Specialisation of Peraluminous Two-Mica Granites of Cabeceiras de Basto Complex (Northern Portugal), Granitic Pegmatites, the State of the Art-International Symposium, Field Trip Guide Book, Memorias, No. 9, pp. 33-38.

[5] Baker, D. R. (1998), “The Escape of Pegmatite Dikes from Granitic Plutons: Constraints fromNew Models of Viscosity and Dike Propagation”, Can. Mineral, Vol. 36, pp. 255-263.

[6] Black, R. (1980), “Precambrian of West Africa”, Episodes, No. 4, pp. 3-8

[7] Burke, K. C. and Dewey, J. F. (1972), “Orogeny in Africa.” In: Dessauvagie, T.F.J. and Whiteman, A. J. (Eds.), African Geology, University ofIbadan Press, Ibadan, pp. 583 - 608.

[8] Caby, R., Brand, J. M. L and Black, R. (1981) “Pan-Afrcan Ocean Closure and Continental Collision in the Hoggar Iforas Segment, Central Sahara”, inPrecambrian Tectonics”, edited by a Kroner, Elsevier Amsterdam, pp 407-434.

[9] Cerny, P. (1982a), Petrogenesis of Granitic Pegmatites, In Mineralogical Association of Canada, Short Course Handbook, No. 8, GraniticPegmatites in Science and Industry, pp. 405- 461.

[10] Cerny, P. (1991a), “Rare-Element Granitc Pegmatites, Part I: Anatomy and Internal Evolution of Pegmatite Deposits”, Geoscience Can., Vol. 18, pp. 49-67.

[11] Cerny, P., and Meintzer, R. E. (1988), “Fertile Granites in the Archaean and Proterozoic Fields of. Rare-Element Pegmatites, Crustal Environment, Geochemistry a Petrogenetic Relationships”, In Geology of Granite-Related Mineral Deposits (R.P. Taylor & D. F. Strong, Eds.), Can. Inst. Mining Metall. Special, Vol. 39, pp. 170-207

[12] Crouse, R. A., Cerny, P., Trueman, D. L., and Burt, R. O. (1984), “The Tanco Pegmatite, Southeastern Manitoba”, In CIM Special, Vol. 29, The Geology of Industrial Minerals in Canada, pp. 169-176.

[13] Dada, S. S. (2006), “Proterozoic Evolution of Nigeria”, In: The Basement Complex of Nigeria and its Mineral Resources (Oshin O. ed.), A Symposium organized to mark the 60th birthday of Prof. M. A. O. Rahaman, held at the Conference Centre, Obafemi Awolowo University, Ile – Ife, Nigeria, May 6th 2006, pp. 29-44.

[14] Garba, I. (2003), “Geochemical discrimination of Newly Discovered Rare Metal Bearing and Barren Pegmatites in the Pan Afican 600 ± 150 Ma Basement of Northern Nigeria”, Applied Earth Science Transaction Institute of Mining and Metallurgy, No. 13, Vol. 112, pp. 287-292.

[15] Ginsburg, A. I., Timofeyev, I. N. and Feldman, L. G. (1979), Principles of Geologyof the Granitic Pegmatites, Nedra, Moscow, Russia, 296pp.

[16] Jacobson, R. and Webb, J. S. (1946), “The Pegmatite of Central Nigeria”,Geological Survey of NigeriaBulletin, Vol. 17, 61pp.

[17] Jones, H. A. and Hockey, R. D. (1964), “The Geology of Part of South Western Nigeria”,Geol.Surv.Nigeria Bull.No. 31, 101pp.

[18] Kinnaird, J. A. (1984),“Contrasting Styles of Sn-Nb-Ta-Zn Mineralisation in Nigeria”, J. Afr. Ear. Sci., Vol. 2, No. 2, pp. 81-90.

[19] Kuster, D. (1990), “Rare-Metal Pegmatites of Wamba,Central Nigeria-their Formation in Relationship to Late Pan-African Granites”, Mineral Deposita, Vol. 25, pp. 25-33.

[20] London, D., (1990), “Internal Differentiation of Rare-Element Pegmatites, ASynthesis of Recent Research”, In Stein, H. J. and Hannah, J. L. (Eds.), Ore-Bearing Granite Systems, Petrogenesis and Mineralising Processses, Geol. Soc. Am. Special Paper, Vol. 246, pp. 35-50.

[21] London, D. (2005), “Granitic Pegmatites, An Assessment of Current Concepts and Directions for The Future”, Lithos, Vol. 8, pp. 281-303.

[22] McCurry, P. (1976), “The Geology of the Precambrian to Lower Paleozoic Rocks of Northern Nigeria- A Review”, Geology of Nig, Elizabethan Publ. Co., Lagos, pp.15-40.

[23] Morgan VI, G. B., London, D., (1987), “Alteration of Amphibolitic Wall rocks Aroundthe Tanco Rare-Element Pegmatite”, Bernic Lake Manitoba, Am. Mineral., Vol. 72, pp. 1097-1121.

[24] Norton, J. J. and Redden J.A., (1990) Relations of zoned pegmatites to other pegmatites, granites and metamorphic rocks in the Southjern Bacl Hills, South Dakota: American Mineralogist, Vol. 75 pp. 531-655.

[25] Raeburn, C. (1924), “The Tinfields of Nasarawa and Ilorin Provinces”, Geological Survey of Nigeria, Bull. 5, pp1-64.

[26] Rahaman, M. A. (1976), “Review of Basement Geology of Southern Nigeria, InKogbe”, C. A.(Eds.), Geol. Nigeria Elizabethan, Lagos, Nigeria, pp. 41-58.

[27] Rahaman, M. A. (1988), “Recent Advances in the Study of the BasementComplex of Nigeria”, Precambrian Geol. Nigeria, Geol. Surv. Nig. Pub., pp. 324-327.

[28] Simandl. G. J. (2002), “The Chemical Characteristics and Development PotentialOf Magnesite Deposits in British Columbia, Canada”, In Scott, P. W. and Bristow, C.M., Eds., Industrial Minerals and Extractive Industry Geology, Geological Society, London, pp. 169-178.

[29] Truswell, J. F. and Cope, R. N. (1963), “The Geology of Parts of Niger and Zaria Provinces, Northern Nigeria”, Geological Survey of Nigeria, Bull., Vol. 29, 54pp.

[30] Varlamoff, N., (1972) Central and West African Rare-metal Granitic Pegmatites, Related Aplites, Quartz Veins and Mineral Deposits. Mineralium Deposita vol. 7, pp. 202-216

[31] Wright, J. B. (1976), “Fracture Systems in Nigeria and Initiation of Fracture Zonesin the SouthAtlantic”, Tectonophysics, Vol. 34, pp. 743-747.