The potassic-granites of the Igbeti area: further evidence of the polycyclic evolution of the Pan-African belt in southwestern Nigeria

Rahaman, M.A.; Emofurieta, W.O.; Caen-Vachette, M.

doi:10.1016/0301-9268(83)90059-1

Cited by 67 publications

(38 citation statements)

References 6 publications

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“…[7,[10][11][12][13]. Several orthogneisses of Paleoproterozoic age have been documented from some parts of southwestern Nigeria including Ibadan granitic gneiss-Rb/Sr isochron age of 2206 ± 70 Ma [4], Ile-Ife grey gneiss-U-Pb age of 2.3 Ga [9], Igbeti augen gneiss-Rb/Sr isochron age of 1.9 Ga [14], Kabba granodioritic gneiss-U-Pb age of 2103 ± 8 Ma [2].…”

Section: Introductionmentioning

confidence: 99%

U-Pb Geochronology of the Jebba Granitic Gneiss and Its Implications for the Paleoproterozoic Evolution of Jebba Area, Southwestern Nigeria

Okonkwo¹,

Ganev²

2012

IJG

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Jebba area southwestern Nigeria forms part of the Nigerian basement complex which lies in the Neoproterozoic PanAfrican mobile belt. It is underlain by several lithological units among which is a polydeformed granitic gneiss. This rock has been dated by LA-ICP-MS yielding a concordant U-Pb zircon age of 2207 ± 20 Ma indicating the crystallization age of the granite protolith. This early Rhyacian age and its affinity with within-plate granites indicates emplacement during crustal extension and rifting preceding the main phase of the Eburnean orogeny. The strong, early, shear fabric, S 1 , in the rock is interpreted to be also of Paleoproterozoic age i.e. imprinted during the Eburnean orogeny. The Jebba granitic gneiss is thus correlatable with the widely abundant Paleoproterozoic granitic magmatism now represented by many orthogneisses and documented in other parts of southwestern Nigeria, the West African craton, the Borborema Province, the Gurupi Belt, Sao Luis craton and Sao Francisco craton in Brazil.

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Section: Introductionmentioning

confidence: 99%

U-Pb Geochronology of the Jebba Granitic Gneiss and Its Implications for the Paleoproterozoic Evolution of Jebba Area, Southwestern Nigeria

Okonkwo¹,

Ganev²

2012

IJG

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“…They include migmatites, orthogneisses, paragneisses as well as metabasic rocks which have attained amphibolites facies metamorphic conditions and in a few places the granulite facies conditions. Geochronological data from gneisses in southwestern Nigeria include late Archean and Paleoproterozoic ages (Oversby, 1975;Pidgeon et al, 1976;Rahaman et al, 1983;Caen-Vachette and Umeji, 1987;Rahaman, 1988;Annor 1995;Okonkwo and Ganev 2012).…”

Section: Geological Settingmentioning

confidence: 99%

“…1a, Caby, 1989;Ferre et al, 2002) that contains rocks that have yielded Archaean, Proterozoic and Early Palaeozoic ages (Oversby, 1977;van Breemen et al, 1977;Rahaman et al, 1983;Fitches et al, 1985;Ekwueme, 2005;Dada, 1998). The tectonic units of the Nigerian shield form the link between the northwestern Africa Neoproterozoic Pan-African orogenic belt with the South American Neoproterozoic Braziliano Borborema Province.…”

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confidence: 97%

Geochemistry and geochronology of orthogneisses in Bode Saadu area, southwestern Nigeria and their implications for the Palaeoproterozoic evolution of the area

Okonkwo

Ganev

2015

Journal of African Earth Sciences

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“…The mobile belt is sandwiched between the West African Craton in the west and the Gabon-Congo Craton to the east. This belt experienced polytectonic and polymetamorphic activities (Rahaman et al, 1983;Olade and Elueze, 1979;Ajibade 1988;Nzenti et al, 1988;Ekwueme, 1987). The area consists of high-grade metamorphic rocks (upper amphibolite to granulite facies), such as charnockitic gneiss and migmatites (garnet-biotite gneiss and hornblende-biotite gneiss), and quartzites (Ekwueme, 1994;Ukwang, 1998;Ukaegbu, 2003;Ukwang et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Trace element geochemistry and tectonic characterization of the granulite facies rocks from Southwest Obudu Plateau, southeastern Nigeria

Ukwang

Ekwueme

2009

Chin. J. Geochem.

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The trace elements characteristics of the migmatitic gneisses (biotite-garnet-and hornblende-biotite), granulite facies rocks (charnockitic gneisses) and meta-peridotite in the area of Southwest Obudu Plateau indicate that the area exhibits a high degree of geochemical variability. Compatible trace elements (Ni and Cr) are comparatively high in the granulite facies rocks and meta-peridotite. Ni ranges from 28×10 -6 to 266×10 -6 whilst Cr ranges from 62×10 -6 to 481×10 -6 for the granulite facies rocks (charnockitic gneisses), and for the meta-peridotite Ni varies between 2045×10 -6 and 2060×10 -6 . Incompatible trace elements show a higher variability in these rocks. The rocks in the area of Southwest Obudu Plateau generally are characterized by the high concentrations of Ba, Ce, Sr, Rb, Ga, Ni, Cr, Co, Zr, Pr and moderate concentrations of Cu, Sm and Th. The available data show that the charnockitic gneisses are of lower crustal origin. The enrichment of the meta-peridotite in compatible trace elements suggests the primitive mantle would be the source region, with slight contamination during ascent. These diverse origins collaborate the tectonic setting of the area as shown by discrimination diagrams. The diverse tectonic settings range from arc to collisional. Alkaline to sub-alkaline magmatism in the area was probably contemporaneous with the tectonic events that occurred in the area during the Proterozoic.

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The potassic-granites of the Igbeti area: further evidence of the polycyclic evolution of the Pan-African belt in southwestern Nigeria

Cited by 67 publications

References 6 publications

U-Pb Geochronology of the Jebba Granitic Gneiss and Its Implications for the Paleoproterozoic Evolution of Jebba Area, Southwestern Nigeria

U-Pb Geochronology of the Jebba Granitic Gneiss and Its Implications for the Paleoproterozoic Evolution of Jebba Area, Southwestern Nigeria

Geochemistry and geochronology of orthogneisses in Bode Saadu area, southwestern Nigeria and their implications for the Palaeoproterozoic evolution of the area

Trace element geochemistry and tectonic characterization of the granulite facies rocks from Southwest Obudu Plateau, southeastern Nigeria

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