Petrology and geochemistry of granitic intrusive rocks from the western part of the Oban Massif, southeastern Nigeria

Rahman, Ahmadur; Ekwere, S. J.; Azmatullah, M.; Ukpong, E.E.

doi:10.1016/0899-5362(88)90061-9

Cited by 33 publications

(22 citation statements)

References 14 publications

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“…5a-i). Computations and plots of the same variables proposed by Frost et al (2001) using the data on granitic rocks from the other parts of the Precambrian basement complex of Nigeria obtained from published work (Egbuniwe et al, 1985;Onyeagocha, 1986;Olarewaju, 1987;Rahman et al, 1988) show that the rocks are also generally magnesian. Unlike the rocks in this study, they are mostly alkali-calcic and metaluminous; it is only the granitoids in the work of Rahman et.…”

Section: Resultsmentioning

confidence: 95%

Petrology and geochemical characteristics of Precambrian granitic basement complex rocks in the southernmost part of North-Central Nigeria

Obiora

Ukaegbu

2009

Chin. J. Geochem.

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The Precambrian basement complex in the southernmost part of North-Central Nigeria is underlain by migmatitic banded gneisses, granitic intrusions and dykes of dolerite, rhyolite porphyry and pegmatite. The rocks are generally felsic, containing modal and normative hypersthene, as well as normative corundum. The basement complex has experienced high-grade regional metamorphism as indicated by the presence of hypersthene and plagioclase of andesine composition. Anatectic melting is suggested by the occurrence of ptygmatic folds, folded gneissose foliation, numerous quartzo-feldspathic veins and lenses of dark-colured, micaceous schistose rocks. Geochemically, the rocks have magnesian, calc-alkalic and strongly peraluminous characteristics. Their overall characteristics suggest derivation from progressive (fractional) partial melting of pelitic rocks during high-grade regional metamorphism, possibly associated with intense hydrothermal activities. The magnesian characteristics reflect close affinity to relatively hydrous, oxidizing melts and source regions in settings broadly related to subduction.

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Section: Resultsmentioning

confidence: 95%

Petrology and geochemical characteristics of Precambrian granitic basement complex rocks in the southernmost part of North-Central Nigeria

Obiora

Ukaegbu

2009

Chin. J. Geochem.

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“…Ekwueme (2003) stated that the dominant intrusive rocks in the western part are granodiorites and pegmatites. These intrusive granodiorites themselves enclose mappable bodies of pegmatite and have been shown to be calc-alkaline (Ekwueme and Onyeagocha, 1985b;Rahaman et al, 1988). Ekwueme (1987) stated that the schists and gneisses of the study area range in age from 527 to 680 Ma whereas the banded amphibolites yielded a whole-rock Rb-Sr isochron age of 784±13 Ma.…”

Section: Geologic Settingmentioning

confidence: 97%

“…It has not been as extensively studied as other parts of the Precambrian Basement. Geological workers such as Orajaka (1973), Olade (1980), Ekwueme and Onyeagocha (1985a, b), Ekwueme and Caen-Vachette (1992), Ekwueme and Kroner (1998), Rahaman et al (1981Rahaman et al ( , 1988, Ekwueme et al (1988Ekwueme et al ( , 1991 have studied different aspects of the geology of Oban. Most of these studies were field oriented with bulk-rock chemical analyses of some rock samples.…”

Section: Introductionmentioning

confidence: 98%

Mineralization of pegmatites in parts of the Oban Massif, Southeastern Nigeria: A preliminary analysis

Ero

Ekwueme

2009

Chin. J. Geochem.

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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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“…The area falls under the Basement Complex area of Oyo state within the southwestern part of the reactivated basement complex of Nigeria and is underlain by the crystalline basement complex which wholly belong to the Pre-Cambrian -Cambrian potentials positively (Rahman et al, 1988). The local lithological units identified in the study area comprise of Pegmatite, Quartz Vein and undifferentiated Gneiss complex probably mainly schist.…”

Section: Geology and Hydrogeology Of The Studied Areamentioning

confidence: 99%

Hydro geophysical Investigation for groundwater development at Gbongudu Area, Akobo Ojurin, Ibadan, Southwestern Nigeria

Layade¹,

Adegoke²,

Oladewa³

2017

Journal of Applied Sciences and Environmental Management

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This paper presents the geophysical investigation for groundwater at Gbongudu area, Akobo Ojurin, Ibadan, Southwestern Nigeria. The area is underlain by the crystalline basement complex rocks and accessibility to potable water especially in the dry period of the year has been a major challenge. The Vertical Electrical Sounding using the Schlumberger configuration was employed. Twelve (12) vertical electrical sounding points were established in order to delineate the geo-electric layers in the area as well as evaluate the groundwater potential. The results are presented as profiles, geologic sections, curves, and maps. The VES results revealed a maximum of five geo-electric layers, viz: topsoil/lateritic sand, shale/clay, weathered layer, fractured basement and fresh basement respectively. Geo-electric sounding results were critically analyzed and interpreted. The yields of wells dug in most of these locations may be insufficient, even for domestic use because of its relatively small thicknesses. However, at a depth of 9.1 m a fracture zone occurs in VES 6 with resistivity value of 17.8 Ωm suggesting the presence of groundwater. Groundwater potential in this area is low on the average with VES 6 and VES 7 considered to be the main aquifer units suitable for groundwater exploration. © JASEM https://dx.doi.org/10.4314/jasem.v21i3.14

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Petrology and geochemistry of granitic intrusive rocks from the western part of the Oban Massif, southeastern Nigeria

Cited by 33 publications

References 14 publications

Petrology and geochemical characteristics of Precambrian granitic basement complex rocks in the southernmost part of North-Central Nigeria

Petrology and geochemical characteristics of Precambrian granitic basement complex rocks in the southernmost part of North-Central Nigeria

Mineralization of pegmatites in parts of the Oban Massif, Southeastern Nigeria: A preliminary analysis

Hydro geophysical Investigation for groundwater development at Gbongudu Area, Akobo Ojurin, Ibadan, Southwestern Nigeria

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