Bauchite : a New Variety in the Quartz Monzonitic Series

Oyawoye, M. O.

doi:10.1038/205689a0

Cited by 15 publications

(3 citation statements)

References 2 publications

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“…These fayalite-bearing granitic rocks in the basement were first described by Oyawoye (1962Oyawoye ( , 1965, and dated by van Breemen et al (1977). A foliated granite from Panyam gave a zircon U-Pb of 605 ± 10 Ma, which is in agreement with a Rb-Sr whole-rock isochron age of 623 ± 23 Ma for a foliated granite; these are interpreted to be ages of emplacement.…”

Section: Punctuated Anorogenic Magmatism In Nigeriamentioning

confidence: 67%

Punctuated anorogenic magmatism

Martin

Sokolov

Magaji

2012

Lithos

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Section: Punctuated Anorogenic Magmatism In Nigeriamentioning

confidence: 67%

Punctuated anorogenic magmatism

Martin

Sokolov

Magaji

2012

Lithos

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“…The first is assortment of structurally complex and compositionally heterogenous migmatitic and gneissic units which forms the oldest, it is Archean-Paleoproterozoic in age. The second is assemblage of low-grade schistose rocks popularly referred to as schist belts of Mesoproterozoic age and finally, the granitoids of Pan-African (Neoproterozoic) age (Oyawoye 1965;Cooray, 1974;Elueze, 2000). The schist belts contain rocks of Mesoproterozoic-Neoproterozoic age that are deposited in intracratonic basins, 17 such belts occur in Nigeria (Ekwueme, 2003).…”

Section: Regional Geologymentioning

confidence: 99%

Lithological features and chemical characterization of metamorphosed carbonate rocks in Igue, Southwestern Nigeria

Akinola¹,

OlaOlorun²

2021

J. Geol. Min. Res.

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This paper investigates and reports the lithological and compositional features of Igue marble deposit in southwestern Nigeria. The deposit occurs as low-lying heterogeneous units under a humus-laden dark brown tropical soil within Igarra Schist Belt on south eastern flank of basement complex of southwestern Nigeria. The marble deposit occurs as lenses sandwiched between quartz-biotite schist, calc-silicate gneiss and polygenetic metaconglomerate intercalated with mica schist and quartzite all resting on ancient migmatite gneiss. The three colour variants of the marble which are white, grey, and foliated have average SiO 2 contents of 2.92, 1.72 and 4.04% respectively. In the same order, average CaO contents are 60.76, 59.35 and 51.7%; MgO contents are 1.62, 1.42 and 2.57% indicating the marble is calcitic in nature. The oxides P 2 O 5 , TiO 2 and MnO altogether constitute 0.09, 0.11 and 0.41% of the bulk chemistry of the white, grey, and foliated marble, respectively. Average loss on ignition (LOI) in white marble (33.46%), grey marble (36.12%) and foliated marble (33.49%) are relatively high suggesting high volatile contents. Chemical features of the marble deposit are comparable to similar rock types in Obajana and Ososo areas in Southwestern Nigeria. The marble differs significantly from Igbeti marble deposit which is dolomitic in nature. Marble deposits from different parts of Nigeria basement exhibits variable geochemical features that are influenced by their protoliths, mode of formation and associated lithologies and forms the basis for various economic uses.

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“…In Fig. 3, the diagram is shown as applied to three well-documented igneous assemblages, and it has also been tested on some other well-known suites, notably from the Scottish Hebrides (Bailey et al, 1924;Dunham, 1965;Wager et al, 1965), Nuanetsi (Cox et al, 1965), South Greenland (Upton, 1960;, Nigeria (Jacobson, MacLeod, & Black, 1958;Oyawoye, 1964;Truswell & Cope, 1963), New Zealand (Thompson, Kermode FIG. 3.-Analyses from various provinces plotted on alkalinity ratio variation diagram. Key:-X Calc-alkaline adamellite porphyrite, New South Wales (Wilkinson et al, 1964, • Peralkaline theralite-tinguaite suite, Square Top sill (Wilkinson, 1965, Table 8, analyses 1, 4, 5, 8).…”

Section: The Proposed New Parametermentioning

confidence: 99%