The pegmatites in southern Akwanga occur within the reactivated belt of the basement complex of Nigeria. The pegmatites consist of dominantly albite–muscovite pegmatites (rare-metal), southern parts of the map areas and biotite-microcline pegmatites (barren) central parts of the map. The pegmatites intruded gneiss-migmatitic complex consist of metasedimentry rocks; granitic gneisses and biotite gneisses and rarely meta-igneous, amphibolites. The rare metal pegmatites are composed of quartz, albite and muscovites and tourmaline. Garnets, ilmenites and minor tin–columbite–tantalite mineralization constitute accessory minerals in contrast to the biotite-microcline pegmatites. The host rocks are composed of quartz, plagioclase (An5–21; albites–oligoclase), microcline and muscovite. Minor constituents include biotites, cordierites and hornblendes. Ilmenite occurs as opaques. The pegmatites and their host rocks are corundum and hypersthene normative, highly peraluminous, exhibiting similar geochemical signatures; however, the rare metal pegmatites are more fractionated than the host rocks and the biotite-microcline pegmatites. The rare metal pegmatites are relatively enriched in Rb, Li, Cs, B, Be, Nb and Ta, low in K/Rb and Al/Ga ratios than the biotite–microcline–pegmatites and their host rocks. The pegmatites are products of crustal anatexis of sedimentary origin. This indicates that the rare metal pegmatites are source rock controlled (product of post-collision activities) rather than fractional crystallization.
Rare metal pegmatites occur in Southern Akwanga, north central Nigeria
Highly peraluminous and LCT pegmatites
Sn–Nb–Ta mineralization potentials in the pegmatite
They are related to the migmatitic-gneiss complex by anatexis
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Abdelfadil K M, Asimow P D, Azer M K and Gahlan H A 2016 Genesis and petrology of Late Neoproterozoic pegmatites and aplites associated with the Taba metamorphic complex in southern Sinai, Egypt; Geochem. Acta 14(3) 219–233.
Adekeye J I D and Akintola O F 2007 Geochemical features of rare metal pegmatites in Nasarawa area, central Nigeria; J. Min. Geol. 43(1) 15–21.
Akintola O F and Adekeye J I D 2008 Mineralization potentials of pegmatites in the Nasarawa area of central Nigeria; Earth Sci. Res. J. 12(2) 213–234.
Akintola A I, Ikhane P R, Okunlola O A, Akintola G O and Oyebolu O O 2012 Compositional features of Precambrian pegmatites of Ago-Iwoye area, southwestern, Nigeria; J. Ecol. Nat. Environ. 4(3) 71–87.
Akoh J U, Ogunleye P O and Aliyu A I 2015 Geochemical evolution of micas and Sn-, Nb-, Ta- mineralization associated with the rare metal pegmatite in Angwan Doka, central Nigeria; J. Afr. Earth Sci. 97 167–174.
Anderson J L and Cullers R L 1990 Middle to upper crustal plutonic construction of a magmatic arc: An example from the Whipple Mountains metamorphic core complex; In: The nature and origin of Cordilleran Magmatism; Geol. Soc. Am. Memoir 174 47–69.
Arthaud M H, Caby R, Fuck R A, Dantas E L and Parente C V 2008 Geology of the northern Borborema Province, NE Brazil, and its correlation with Nigeria, NW Africa; In: West Gondwana: Pre-Cenozoic correlations across the South Atlantic Region (eds) Pankhurst R J, Trouw R A J, Brito Neves B B and De Wit M J, Geol. Soc. London, Spec. Publ. 294 49–67.
Barbarin B 1990 Granitoids: Main petrogenetic classifications in relation to origin and tectonic setting; Geol. J. 25 227–238.
Burke K C and Dewey J F 1972 Orogeny in Africa; In: African geology (eds) Dessauvagie T F J and Whiteman A J, University of Ibadan Press, Ibadan, pp. 583–608.
Black R, Caby R, Moussine-Pouchkine A, Bertrand J M, Fabre J and Lesquer A 1979 Evidence for the Late Precambrian plate tectonics in West Africa; Nature 278 223–227.
Black R and Liegeois J P 1993 Cratons mobile belts, alkaline rocks and continental lithospheric mantle: The Pan-African testimony; J. Geol. Soc. London 150 89–98.
Caby R, Bertrand J M L and Black R 1981 Pan-African ocean closure and continental collision in the Hoggar-Iforas segment, central Sahara (ed.) Kroner A, Elsevier, Amsterdam, pp. 407–434.
Casting C, Feybesse J L, Thieblemont D, Triboulet C and Chevremont P 1994 Palaeogeographical reconstructions of the Pan-African/Brasiliano orogeny: Closure of an oceanic domain or intracontinental convergence between major blocks? Precamb. Res. 69 327–344.
Černý P and Meintzer R E 1988 Fertile granites in the Archean and Proterozoic fields of rare element pegmatites: Crustal environment, geochemistry and petrogenetic relationships; In: Recent advances in the geology of granite-related mineral deposits; Can. Institute of Mining and Metallurgy, Spec. Publ. 39 170–206.
Cerný P 1989 Contrasting geochemistry of two pegmatite fields in Manitoba: Products of juvenile Aphebian crust and polycyclic Archean evolution; Precamb. Res. 45 215–234.
Černý P, London D and Novak M 2012 Granitic pegmatites as reflections of their sources; Elements 8 257–261.
Chappell B W and White A J R 1974 Two contrasting granite types; Pacific Geol. 8 173–174.
Chappell B W and White A J R 2001 Two contrasting granite types: 25 years later; Austr. J. Earth Sci. 48 489–499.
Chukwu A and Obiora S C 2014 Whole-rock geochemistry of basic and intermediate intrusive rocks in the Ishiagu area: Further evidence of anorogenic setting of the Lower Benue rift, southeastern Nigeria; Turk. J. Earth Sci. 23 427–443.
Chukwu A and Obiora S C 2018 Geochemical constraints on the petrogenesis of the pyroclastic rocks in Abakaliki basin (Lower Benue Rift), southeastern Nigeria; J. Afr. Earth Sci. 141 207–220.
Christiansen E H, Stuckless J S, Funkhouser-Marolf M J and Howell K H 1993 Petrogenesis of rare metal granites from depleted sources: An example from the Cenozoic of western Utah; In: Recent Advances in the Geology of granite-related mineral deposits; pp. 307–321.
Collins W J, Beams S D, White A J R and Chappell B W 1982 Nature and origin of A-type granites with particular reference to Southeastern Australia; Contrib. Mineral. Petrol. 80 189–200.
Dada S S and Respaut J P 1989 The quartz fayalite monzonite (bauchite) of Bauchi, new evidence of a syntectonic Pan-African magmatism in northern Nigeria; Comptes Rendus Academie Science de Paris 309 887–892.
De la Roche H, Leterrier J, Grandclaude P and Marchal M 1980 A classification of volcanic and plutonic rocks using R1–R2 diagrams and major-element analyses: Its relation with current nomenclature; Chem. Geol. 29 183–210.
Ekwueme B N and Matheis G 1995 Geochemistry and economic value of pegmatites in the Precambrian basement of southeast Nigeria; In: Magmatism in relation to diverse tectonic settings (eds) Srivastava R K and Chandra R, New Delhi, Oxford & IBH Publishing Co., pp. 375–392.
El Bouseily A M and El Sokkary A A 1975 The relationship between Rb–Ba and Sr in granitic rocks; Chem. Geol. 16 207–219.
Frost B R, Barnes C G, Collins W J, Arculus R J, Ellis D J and Frost C D 2001 A geochemical classification for granitic rocks; J. Petrol. 42 2033–2048.
Garba I 2002 Late Pan-African tectonics and origin of gold mineralisation and rare-metal pegmatites in the Kushaka Schist Belt, northwestern Nigeria; J. Min. Geol. 38(1) 1–12.
Garba I 2003 Geochemical discrimination of newly discovered rare-metal bearing and barren pegmatites in the Pan-African (600±150) basement of northern Nigeria; Appl. Earth Sci. (Trans. Institut. Mining Metalur., Sect. B) 112 287–292.
Gardien V, Thompson A B, Grujie D and Ulmer P 1995 Experimental melting of biotite + plagioclase + quartz ± muscovite assembleges and implications for crustal melting; J. Geophys. Res.-Solid Earth 100 15,581–15,591.
Goodenough K M, Lusty P A J, Roberts N M W, Key R M and Garba A 2014 Post-collisional Pan-African granitoids and rare metal pegmatites in western Nigeria: Age, petrogenesis, and the ‘pegmatite conundrum’. Lithos 200–201 22–34.
Grant N K 1970 Geochronology of Precambrian basement rocks from Ibadan, southwestern Nigeria; Earth Planet. Sci. Lett. 10 29–38.
Harris N B W, Pearce J A and Tindle A G 1986 Geochemical characteristics of collision-zone magmatism; Geol. Soc. London, Spec. Publ. 90 67–81.
Ibe C U and Obiora S C 2019 Geochemical characterization of granitoids in Katchuan Irruan area: Further evidence for peraluminous and shoshonitic compositions and post-collisional setting of granitic rocks in the Precambrian Basement Complex of Nigeria; Acta Geochim., https://doi.org/10.1007/s11631-019-00318-0.
Icenhower J and London D 1995 Experimental study of element partitioning among biotite, muscovite and coexisting peraluminous silicic melt at 200 MPa (H2O); Am. Mineral. 80 1229–1251.
Jacobs J and Thomas R J 2004 Himalayan-type indenter-escape tectonics model for the southern part of the late Neoproterozoic-early Palaeozoic East African-Antarctic Orogen; Geology 32 721–724.
Jacobson R and Webb J S 1946 The pegmatites of Central Nigeria; Geol. Surv. Nigeria Bull. 17 61p.
Jahns R H and Ewing R C 1976 The Harding mine, Taos County; New Mexico Geological Society, New Mexico.
John B E and Wooden J 1990 Petrology and geochemistry of the metaluminous to peraluminous Chemehuevi Mountains Plutonic suite, southern California; In: The nature and origin of Cordilleran Magmatism (ed.) Anderson J L, Geol. Soc. Am. Memoir 174 71–98.
Jones H A and Hockey R D 1964 The geology of part of southwestern Nigeria; Nigeria Geol. Surv. Bull. 31 87.
King P L, White A J R, Chappel B W and Allen C M 1997 Characterization and origin of aluminous A-type granites from the Lachlan Fold Belt, southeastern Australia; J. Petrol. 38 371–391.
Kuster D 1990 Rare-metal pegmatites of Wamba, central Nigeria – their formation in relationship to late Pan-African granites; Miner. Deposita 25 25–33.
Küster D and Harms U 1998 Post-collisional potassic granitoids from the southern and northwestern parts of the Late Neoproterozoic East African Orogen: A review; Lithos 45 177–195.
London D 2005 Granitic pegmatites: An assessment of current concepts and directions for the future; Lithos 80 281–303.
London D and Kontak D J 2012 Granitic pegmatites: Scientific wonders and economic bonanzas; Elements 8 251–261.
Maniar P D and Piccoli P M 1989 Tectonic discrimination of granitoid;. Geol. Soc. Am. Bull. 101 635–643.
Matheis G 1987 Nigerian rare-metal pegmatites and their lithological framework; In: African Geology Reviews (eds) Bowden P and Kinnaird J A, Geol. J. 22 271–291.
Matheis G and Caen-Vachette M 1983 Rb–Sr isotopic study of rare-metal bearing and barren pegmatites in the Pan-African reactivation zone of Nigeria; J. Afr. Earth Sci. 1 35–40.
Martins T, Kremer P and Vanstone P 2013 The Tanco mine: Geological setting, internal zonation and mineralogy of a world-class rare element pegmatite deposit; Geological Association of Canada-Mineralogical Association of Canada joint Annual Meeting, Manitoba Geological Survey, Open File OF2013-8, 17p.
McCurry P and Wright J B 1977 On place and time in orogenic granite plutonism; J. Geol. Soc. Am. 82(6) 1713–1716.
McDonough W F and Sun S-S 1995 The composition of the Earth; Chem. Geol. 120 223–253.
Melcher F, Graupner T, Gabler H-E, Sitnikova M, Henjes-Kunst F, Oberthur T, Gerdes A and Dewaele S 2013 Tantalum-(niobium-tin) mineralization in African pegmatites and rare metal granites: Constriants from Ta–Nb oxide mineralogy, geochemistry and U–Pb geochemistry; Ore Geol. Rev. 64 667–719.
Nehring F, Foley S and Holtta P 2010 Trace element partitioning in the granulite facies; Contrib. Mineral. Petrol. 159 493–519.
Obiora S C and Ukaegbu V U 2008 Petrology and geochemical characteristics of Precambrian granitic basement complex rocks in the southernmost part of north-central Nigeria; Chinese J. Geochem. 28 377–385.
Obiora S C 2005 Field descriptions of hard rocks with examples from the Nigerian Basement Complex; 1st edn, Snap Press (Nig.) Ltd., Enugu.
Obiora S C 2012 Chemical characterization and tectonic evolution of hornblende-biotite granitoids from the Precambrian Basement complex around Ityowanye and Katsina-Ala, southeastern Nigeria; J. Min. Geol. 48(1) 13–29.
Okonkwo C T and Folorunso I O 2013 Petrochemistry and geotectonic setting of granitic rocks in Aderan area, SW Nigeria; J. Geogr. Geol. 5(1) 30.
Okunlola O A and King P 2003 Process test work for the recovery of Ta 205 concentrates from rare meal bearing pegmatites of Nasarawa area, central Nigeria; Global J. Geol. 1(1) 10–15.
Okunlola A O and Ocan O O 2009 Rare metal (Ta–Sn–Li–Be) distribution in Precambrian pegmatite of Keffi area, Central Nigeria; Nature Sci. 7 90–99.
Okunlola O A and Oyedokun M O 2009 Compositional trends and rare metal Ta–Nb mineralization potential of pegmatite and associated lithologies of Igbeti Area, South-western Nigeria; RMZ–Materials and Geoenvironment 56(1) 38–53.
Olarewaju V 1987 Charnockite-granite association in SW Nigeria: Rapakivi granite type and charnockite plutonism in Nigeria? J. Afr. Earth Sci. 6 67–77.
Onyeagocha A C 1984 Petrology of geologic history of Akwanga area in Northern Nigeria; J. Afr. Earth Sci. 2 41–50.
Patino Douce A E and Harris N 1998 Experimental constraints on Himalayan anataxis; J. Petrol. 39 689–710.
Pearce J A 1996 Sources and setting of granitic rocks; Episodes 19 120–125.
Pearce J A, Harris N B W and Tindle A G 1984 Trace element discrimination diagrams for the tectonic interpretation of granitic rocks; J. Petrol. 25 956–983.
Pearce J A and Peate D W 1995 Tectonic implications of the composition of volcanic arc magmas; Ann. Rev. Earth Planet. Sci. 23 251–285.
Peccerillo A and Taylor S R 1976 Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area, Northern Turkey; Contrib. Mineral. Petrol. 73 69–87.
Rahaman M A and Ocan D 1978 On Relationship in the Precambrian migmatitic gneiss of Nigeria; J. Min. Geol. 15 23–32.
Rahaman A M S, Ekwere S J, Azmatullah M and Ukpong E E 1988 Petrology and geochemistry of granitic intrusive rocks from the western part of Oban Massif, Southeastern Nigeria; J. Afr. Earth Sci. 7 149–157.
Selway J B, Breaks F W and Tindle A G 2005 A review of rare-element (Li–Cs–Ta) pegmatite exploration techniques for the Superior Province, Canada, and large worldwide tantalum deposits; Explor. Min. Geol. 14(1–4) 1–30.
Shaw R A, Goodenough K M, Roberts N M W, Horstwood M S A, Chenery S R and Gunn A G 2016 Petrogenesis of rare-metal pegmatites in high-grade metamorphic terranes: A case study from the Lewisian Gneiss Complex of north-west Scotland; Precamb. Res. 281 338–362.
Stavrov O D, Stolyarov I S and Iocheva E I 1969 Geochemistry and origin of the Verkh-Iset granitoid massif in central Ural; Geochem. Int. 6 1138–1146.
Stepanov A A, Mavrogenes J, Meffre S and Davidson P 2014 The key role of mica during igneous concentration of tantalum; Contrib. Mineral. Petrol. 167 1–8.
Stilling A, Cerny P and Vanstone P J 2006 The Tanco Pegmatite at Bernic Lake, Manitoba, XVI, Zonal and bulk compositions and their petrogenetic significance; Can. Mineral. 44 599–623.
Taylor S R and McLennan S M 1985 The Continental crust: Its composition and evolution – an examination of the geochemical record preserved in sedimentary rocks; Blackwell Scientific Publishers.
Tkachev A V 2011 Evolution of metallogeny of granitic pegmatites associated with orogens throughout geologic time; In: Granite-related ore deposits (eds) Sial A N, Bettencourt J S and De Campos C D, Geol. Soc. London, Spec. Publ. 350 7–23.
Wedepohl K H 1995 The composition of the continental crust; Geochim. Cosmochim. Acta 59 1217–1232.
Wright J B 1970 Controls of mineralization in the Older and Younger Tin Fields of Nigeria; Econ. Geol. 65 945–951.
Zhu Y-F, Zeng Y and Gu L 2006 Geochemistry of the rare metal-bearing pegmatite no. 3 vein and related granites in the Keketuohai region, Altay Mountains, northwest China; J. Asian Earth Sci. 27 61–77.
The authors are very grateful to the Association of Applied Geochemists (AAG) for sponsoring the whole rock geochemical analyses (in-kind analytical support) as parts of the first authors PhD research work. Efforts of the management of Genalysis (Intertek) Laboratory Services, Australia, are highly appreciated for their prompt responses, quality and detailed laboratory analyses. We are very grateful to Prof. T C Davies for his countless assistance in obtaining the in-kind analytical support from AAG for the geochemical analyses. Efforts of the Editor, R Bhutani and other anonymous reviewers are highly appreciated for their constructive reviews.
Communicated by Rajneesh Bhutani
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Chukwu, A., Obiora, S.C. Petrogenetic characterization of pegmatites and their host rocks in southern Akwanga, North-Central Basement Complex, Nigeria. J Earth Syst Sci 130, 18 (2021). https://doi.org/10.1007/s12040-020-01498-7
- Nigerian basement complex
- southern Akwanga rare metal pegmatites
- LCT and peraluminous
- crystal fractionation