Abstract
The Oban Basement Massif of southeastern Nigeria is composed of metamorphosed rocks including phyllites, schists, gneisses and amphibolites cut by pegmatitic dykes of varying length and thickness, which intruded the metamorphic rocks. Preliminary geochemical study and analysis of these pegmatites from western Oban Massif at Uyanga, Akwa Ibami, Iwuru I, Iwuru II and Igbofia showed that the pegmatites are highly albitized. This is inconsistent with earlier postulations that the pegmatites in this part of Nigeria are barren. Indices of fractionation such as Ba/Rb, K/Rb, Na/K, K/Cs, K/Ba reveal that the pegmatites are mineralized and different discrimination plots show that they are enriched in Li, Be, Sn, Ba, Ta, Ni, Cs, Sn and Zn. Rare metal indicative elements such as Ta, Nb, Rb, Cs, and Sn are enriched in the pegmatites, confirming that the pegmatites are mineralized.
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Baumgartner R., Romer R.L., Moritz R., Sallet R., and Chiaradia M. (2006) Columbite-tantalite bearing granitic pegmatites from the Serido Belt, North-Eastern Brazil: Genetic constraints from U-Pb dating and Pb isotopes [J]. Can. Mineralogist. 44, 69–86.
Bea F., Fershtater G., and Corretge L.G. (1992) The geochemistry of phosphorous in granite rocks and effect of aluminium [J]. Lithos. 29, 43–56.
Beus A.A. (1966) Distribution of tantalum and niobium in muscovites from granite pegmatites [J]. Geokhimiya. 10, 1216–1220.
Cerny P. (1982) Petrogenesis of granitic pegmatites. In Short Course on Granitic Pegmatites Science and Industry (ed. Cerny P.) [M]. pp.405–461. Mineralogical Association of Canada, University of Manitoba Winnipeg Canada.
Cerny P. (1989) Characteristics of pegmatites deposits of tantalum. In Lanthanides, Tantalum and Niobium (eds. Moller P., Cerny P., and Saupe ) [M]. pp.195–239. Springer Berlin, Germany.
De-kun A. (1965) Mineral Resources in Africa [M]. Elsevier, Amsterdam.
Ekwueme B.N. (1985) Petrology, geochemistry and Rb-Sr geochronology of metamorphosed rocks of Uwet area, SE Nigeria [D]. pp.176. Ph.D. Thesis. Univ. Nigeria Nsukka.
Ekwueme B.N. (1987) Structural orientations and Precambrian deformational episodes of Uwet area, Oban Massif, SE Nigeria [J]. Precam. Res. 34, 269–289.
Ekwueme B.N. (2003) The Precambrian Geology and Evolution of the SE Nigeria Basement Complex [M]. pp.217. University of Calabar Press, Calabar, Nigeria.
Ekwueme B.N. and Caen-Vachette M. (1992) Kibaran charnockites from the Oban Massif in the Pan African Belt of Nigeria [J]. IGCP Newsletter/bw. 4, 67–71.
Ekwueme B.N. and Kroner A. (1998) Single Zircon evaporation ages from Oban Massif, SE Nigeria [J]. J. Afr. Earth Sc. 26, 195–205.
Ekwueme B.N. and Matheis G. (1995) Geochemistry and economic values of pegmatites in the Precambrian basement of SE Nigeria. In Magmatism in Relation to Diverse Tectonic Setting (eds. Srivastava R.K. and Chandra R.) [M]. pp.375–392. Oxford. Pub., New Delhi.
Ekwueme B.N. and Onyeagocha A.C. (1985a) Metamorphic isograds of Uwet area, southeastern Nigeria [J]. Journ. Afr. Earth Sci. 3, 443–454.
Ekwueme B.N. and Onyeagocha A.C. (1986) Geochemistry of metasedimentary rocks of Uwet area of Oban Massif, Southeastern Nigeria [J]. Geol. Rundsch. 75, 411–420.
Ekwueme B.N. and Schlag C. (1989) Composition of monazites in pegmatites and related rocks of Oban Massif, SE Nigeria: Implications of Economic mineral exploration [J]. I.G.C.P. Newsletter/Bull. 2, 15–20.
Ekwueme B.N., Caen-Vachette M., and Onyeagocha (1991) Isotopic ages from Oban Massif and Southeast Lokoja: Implications for the crustal evolution of the Nigerian Basement Complex [J]. Journ. Afr. Earth. Sci. 12, 489–503.
Ekwueme B.N., Caen-Vachette M., and Onyeagocha A.C. (1988) Rb-Sr geochronology of Metasedimentary schist and gneisses in the Oban Massif, Southeastern Nigeria [J]. Journ. Min. Geol. 24, 119–124.
Ekwueme B.N., Nyong E.E., and Petters S.W. (1995) Geological Excursion Guide Book [M]. pp.36. Dec-Ford Publ., Calabar Nigeria.
Ekwueme, B.N. and Onyeagocha A.C. (1985b) Petrology of intrusive rocks in Uwet area, Oban Massif, SE Nigeria [J]. J. Min. Geol. 22, 71–78.
Elueze A.A. (1982) Petrochemistry of Precambrian gneiss and migmatites in the western part of Nigeria [J]. Geoscience. 12, 301–306.
Institute of Applied Mineralogy and Geochemistry, Technical University of Munich, Germany (2005) Exploration for Tin Resources in Swaziland: Indicators for Tin Mineralization in Pegmatites [M]. Technical University of Berlin, Berlin, Germany.
Irber W. (1999) The lathanide tetrad effect and its correlation with K/Rb, Eu/Eu*, Sr/Eu, Y/Ho and Zr/Hf of evolving peraluminous granite suites [J]. Geochim. et Cosmochim. Acta. 63, 489–508.
Jacobson R. and Webb J. (1946) The pegmatites of Central Nigeria [J]. Geol. Surv. Nig. Bull. 17.
Linnen R.L. (2004) Ferrocolumbite-Mangano-Tantalite Trends in Granites and Pegmatites: Experimental and Natural Constraints (Abstr.) [Z]. Geol. Soc. Amer. Prog. (abstr.).
Matheis G. (1987) Nigerian rare metal pegmatites and their lithological framework [J]. Geol. Journ (thematic issue). 2, 271–291.
Matheis G. and Caen-Vachette M. (1983) Rb-Sr isotopic study of rare-metal bearing pegmatites in the Pan African reactivation zone of Nigeria [J]. Journ. Afr. Earth. Sci. 1, 3–40.
Mikulski Stanislavz (2002) Tectonic setting of Upper Paleozoic igneous rocks from the Radzimowice Au-Ce-As deposit in the Kaczawa mountains [J]. Rakowiecka. 4, 800–975.
Morteani A. Preinfack and Horn A.H. (2000) Classification and mineralization potential of the pegmatites of the eastern Brazillian pegmatite province [J]. Mineral Deposita. 35, 638–655.
Okunlola A.O. and Somorin E.B. (2005) Compositional features of the Precambrian pegmatites of Itakpe area, Central Nigeria [J]. Global Journ. of Geological Sciences. 4, 221–230.
Olade M.A. (1980) Precambrian metallogeny in West Africa [J]. Geol. Rdsch. 69, 411–428.
Orajaka S.O. (1973) Possible metallogeny provinces in Nigeria [J]. Econ. Geol. 68, 278–280.
Pearce J.A., Harris N.B.W., and Tindle A.G. (1984) Trace element discrimination diagrams for the tectonic interpretations of granitic rocks [J]. J. Petrol. 25, 956–983.
Raeburn C. (1927) Tinstones in Calabar District [J]. Geol. Surv. Nigeria. Bull. 11, 72–88.
Rahaman A.M.S., Ekwere S.J., Azamatullah M., and Ukpong E.E. (1988) Petrology and geochemistry of granitic intrusive rocks from the western part of Oban Massif, SE Nigeria [J]. Journ. Afr. Earth. Sc. 7, 147–159.
Rahaman M.A., Ukpong E.E., and Azamatullah M. (1981) The geology of part of the Oban Massif, SE Nigeria [J]. J. Min. Geol. 18, 60–65.
Staurov O.D., Stolyarov I.S., and Isochewa E.I. (1969) Geochemistry and origin of Verkh Iset Granitoid Massif in central Ural [J]. Geochem. Intern. 6, 1138–1148.
Von Knorring O. and Condliffe E. (1987) Mineralization pegmatites in Africa [J]. Geol. Journ (thematic issue). 22, 253–270.
Wise M.A. (1994) Trace element chemistry of lithium-rich micas from rare-element granitic pegmatites [J]. Mineralogy and Petroogy. 55, 203–215.
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Ero, K.A., Ekwueme, B.N. Mineralization of pegmatites in parts of the Oban Massif, Southeastern Nigeria: A preliminary analysis. Chin. J. Geochem. 28, 146–153 (2009). https://doi.org/10.1007/s11631-009-0146-2
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DOI: https://doi.org/10.1007/s11631-009-0146-2