Petrography and Petrochemical Characteristics of Rare Metal Pegmatites around Oro, Southwestern Nigeria
DOI:
https://doi.org/10.18034/apjee.v1i1.212Keywords:
Pegmatite, Eluvial soils, Mineralization, GeochemicalAbstract
Petrographic and geochemical evaluation of pegmatite bodies occurring as discontinuous dykes have been studied in Oro area of southwestern Nigeria, with a view to determine the compositional characteristics that may be related to Ta-Nb mineralization potentials. They are found intruding semi discordantly, the older assemblages of quartz mica schist and granite gneiss.
A total of twenty-eight samples comprising whole rock pegmatites and eluvial soils were analyzed for major, trace and rare earth elements using (ICP-AES) geochemical method which show the pegmatite samples to be generally highly siliceous with SiO2 values ranging from (71.49-97.77%) with an average of 86.43% in the whole rock samples, and it also ranges from (41.88-57.99%) with an average of 48.43% in the eluvial soil samples, while Al2O3 content is as high as 25.87% in the eluvial soil samples and 6.86% in the whole rock samples depicting the complexity of the pegmatite rock.
Variation plots of K/Rb versus Rb, Ta versus Rb, Ta versus Nb, Ta versus K/Cs, Ta versus Cs+Rb and Ta versus Cs discriminant plot indicate the potentials of rare metal mineralization.
Downloads
References
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.
Akintola, A. I., Ikhane, P. R., Laniyan, T. A., Akintola, G. O., Kehinde-Phillips, O. O. (2011). Compositional trends and rare-metal (Ta-Nb) mineralization potential of Precambrian pegmatites in Komu area, Southwestern Nigeria. International Journal of Current Research Vol.4 issue 02, pp. 031-039
Akintola, A. I., Ikhane, P. R., Okunlola, O. A., Akintola, G. O., Oyebolu, O. O. (2012). Compositional features of Precambrian pegmatites of Ago-Iwoye area Southwestern, Nigeria. Journal of Ecology and the Natural Environment Vol. 4(3), pp.71-87
Beus, A. A. (1960). Geochemistry of beryllium and the Genetic Types of Beryllium Deposits. Acad. Sci. USSR, Moscow, USSR (in Russ.; Engl. Translation: Freeman & Co., San Francisco, California
Beus, A.A. (1966). Distribution of tantalum and niobium in muscovites from granitic pegmatites.Geokhimiya, Vol.10, pp. 1216-1220.
Breaks, F. W., Twindle, A. G and Smith, S. R. (1999). Rare metal mineralization associated with Berens River-Sachiago Subprovincial Boundary, Northwestern Ontario: Discovery of a new zone of complex-type, petalite sub-type of pegmatite and implications for future exploration. Ontario Geological Survey Miscellaneous paper 169,33p
Cerny, P. (1989). Characteristics of pegmatite deposits of tantalum, In Moller, P., Cerny,P., and Saupe., F., (eds) Lanthanides,Tantalum and Niobium. Society For Geology Applied To Mineral Deposits, Special Publication 7; Springer Verlag, pp.192-236.
Cerny, P. (1991a). Geochemical and petrogenetic features of mineralization in rare element granitic pegmatites in the light of current research. Applied Geochemistry; Vol.18, pp. 48-68.
Cerny, P. (1991b). Rare-element granitic pegmatites-regional to global environments and Petrogenesis. Geo-Science Canada; Vol.18, pp. 49-62.
Cerny, P. (1992). Geochemical and Structural evolution of micas in the Rozna and Dubra voda pegmatites, Czech Republic. Mineralogy And Petrology, Vol.52, pp 4-9.
Condie, K.D. (1976). Trace element geochemistry of Archean granite rocks from the Barberton Region, South Africa, AM. Mineral. Earth Planet Sc. Letter, pp. 300-400.
Ekwueme, B. N., (1985). Elementary Crystallography and Mineralogy (including Optics).
Elueze, A.A., Itiola, O.A., and Nton, M.E. (2004). Preliminary investigation on industrial properties of the Olode-Falansa pegmatite, Southwestern Nigeria. Global Jour. Geol. Sci. 2(2), 255-264
Garba, I. (2003). Geochemical discrimination of newly discovered rare metal bearing and barren Pegmatites in the Pan-African (600 + 150 Ma) basement of northern Nigeria. Applied Earth Science Transaction Institute Of Mining And Mettallurgy 13: Vol.112 pp. B287-B291.
Garrels, R.M. and Mackenzie, F.T. (1971). Evolution of Igneous and Sedimentary Rocks. W.W. Norton and Company, Inc. New York, N.Y. 394p.
Ginsburg, A. I. (1984). The geological condition of the location and the formation of granitic pegmatites: 27th IGC proceedings 15: 245-260
Ginsburg, A. I., Timofeyev, I. N., and Feldmann, L. G., (1979). Principles of geology of the granite pegmatites: Moscow, Nedra. 296p
Gordiyenko, V.V. (1971). Concentration of Li, Rb, and Cs in potash feldspar and muscovite as criteria for assessing rare metal mineralization in granite pegmatites. Int. Geology Rev. Vol.13, 134-142.
Jacobson, R.R.E. and Webbs, J.S. (1946). The Pegmatite of Central Nigeria. Geol. Surv. Nig. Bull, 17, 40-61.
Kuster, D. (1990). Rare metal pegmatites of Wamba, central Nigeria their formation in relationship to late Pan-African granites. Mineral Deposita; Vol.25, pp. 25-28.
London, D. (1986a). Formation of tourmaline-rich gem pockets in miarolitic pegmatites. Am Mineral 71: 396-405
London, D. (2005). Granitic pegmatites: An assessment of current concepts and directions for the Future LITHOS. Vol.8, pp. 281-303.
Matheis, G. (1981). Trace element pattern in lateritic soils applied to geochemical exploration. Geochm. Exploration, 15, pp. 471-480
Matheis, G. and Emofurieta, W.O. (1987). Nigerian Rare metal pegmatites and their lithological framework. J. Geol., 22, pp. 271-291.
Matheis, G., Emofurieta, W. O. and Ohweriei, S. F., (1982). Trace element distribution in tin bearing pegmatites of Southwestern Nigeria. In Metallization. Associated with Acid Magmatism. Evans. M. (ed.), Wiley London. Pp. 205-220
Moller, P and Morteani, G. (1987). Geochemical exploration guide for Tantalum pegmatites. Economic Geology, Vol.42, pp. 1885-1897.
Okunlola, O. A., and Ocan, O. O. (2002). The expected environmental impact and mitigation studies of organized mining of rare metal (Ta-Sn-Nb) pegmatites around Keffi area. North central Nigeria. J.Env. Ext. 3; 64-68
Okunlola, O.A and Oyedokun, M.O. (2009). Compositional trends and rare metal (Ta-Nb) mineralization potential of pegmatite and association lithologies of Igbeti area, Southwestern Nigeria. Jour. RMZ- Materials And Geoenvironment, Vol.56, No.1, pp. 38-53.
Okunlola, O.A. (2005). Metallogeny of Tantalite-Niobium Mineralization of Precambrian Pegmatites of Nigeria. Mineral Wealth; 104/2005, pp. 38-50.
Okunlola, O.A. and Jimba, S. (2006). Compositional trends in relation to Ta-Nb mineralization in Precambrian pegmatites of Aramoko and Ara-Ijero area, southwestern Nigeria. Journal of Mining and Geology; Vol. 42(2), pp. 113-126.
Okunlola, O.A. and King, P.A. (2003). Process test work for the recovery of Tantalite-Columbite Concentrates from rare metal pegmatites of Nasarawa area, central Nigeria. Global Jour. Geological Sci, 1 (1) pp. 85-103.
Okunlola, O.A. and Somorin, E.B. (2005). Compositional features of Precambrian pegmatites of Itakpe area, central Nigeria. Global Journal Of Geological Sciences Vol.4 (2), pp. 221-230.
Pearce, J.A. Harris, N.B.W. and Tindle, A.G. (1984). Trace element discriminant diagrams for the tectonic interpretation of granitic rocks. Jour.Petrol. Vol.25, pp. 956-983
Piper, D.Z. (1974). Rare earth elements in sedimentary cycle: A summary. Chem.Geol. Vol.14, pp. 285 304.
Rudenko S. A., Romanov V.A., Morakhovskyi V.N., Tarasov E. B., Galkin G. A., Dorokin V. K. (1975). Conditions of formation and controls of distribution of muscovite objects of the North-Baikal muscovite province, and some general problems of pegmatite consolation. In: Gordiyenko V.V. (ed.) Muscovite pegmatites of the USSR, Nauka, Leningrad, pp 174-182 (in Russia)
Staurov, O.D., Stolyarov, L.S. and Isochewa, E.I. (1969). Geochemistry and Origin of Verkh Iset Granitoid massif in central Ural. Geochem. Intern. Vol.6, pp. 1138-1146.
Taylor, S.R., Rudnick, R.L., Mc Lennan, S.C and Eriksson, K.A. (1986). Rare earth element patterns in Archean high-grade metasediments and their tectonic significance. Geochim. Cosmochim. Acta, 50, pp. 2267-2279.
--0--
Downloads
Published
Issue
Section
License
How to Cite
