Petrochemical and Petrogenetic characteristics of precambrian amphibolites of the Alawa district, northwest Nigeria

Elueze, Anthony Azubuike

doi:10.1016/0009-2541(85)90033-6

Cited by 9 publications

(9 citation statements)

References 17 publications

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“…The Fe 2 O 3 -N a O + K 2 O -MgO ternary plot (Figure 8) of Irvine and Barager (1971) showed the tholeiitic affinity of the magmatic precursor of the amphibolites. The tholeiitic affinity of the amphibolites is equally supported by the trend observed on the Ga vs Y bivariate plot (Figure 9), as majority of the samples plot around the 1.0 ratio (Elueze, 1985;Honkamo, 1987).…”

Section: Resultssupporting

confidence: 58%

“…The petrochemical affinity of the amphibolites: SiO 2 (>47.2%), Al 2 O 3 (>15.10%), and K 2 O (>0.73%) compare favourably with that of the Burum amphibolite (Elueze and Okunlola, 2003) and Daldrian metabasalts (Graham, 1976 (Elueze, 1985) 4: Tegina amphibolite ( Elueze, 1985) 5: Burum amphibolite ( Elueze and Okunlola, 2003) 6: Lema-Ndeji amphibolite ( Okunlola et al, 2007) (Pearce et al, 1979;Pearce, 1980). WPG, within plate granitoids or lava; MORB, mid-ocean ridge basalts; IAT, island arc tholeites…”

Section: Resultsmentioning

confidence: 99%

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Nature and Origin of the Amphibolites in the Precambrian Basement Complex of Iseyin and Ilesha Schist Belts, Southwestern Nigeria

Bolarinwa¹,

Adeleye²

2015

JGG

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Petrographic and geochemical studies of amphibolites from Wonu-Apomu area in Iseyin-Oyan schist belt and Ife-Ilesa area in Ilesha schist belt, southwestern Nigeria, were carried out with a view to unravel their nature and petrogenesis. The amphibolites in Wonu-Apomu are associated with quartzite, quartz schist, talc-schist, granite and pegmatites, while those of Ife-Ilesha area are associated with anthophyllite schist, talc tremolite and talc chlorite schists.Chemical data of the amphibolites showed high Al 2 O 3 (>14%), Fe 2 O 3 (>12.40%), CaO (>8.10), Na 2 O (>3.10%) and K 2 O (>5.0%) contents. Trace element data showed that the amphibolites are enriched in Ba (>137ppm), Sr (>122ppm), Rb (>33ppm), Zr (55pm) and Y (>37ppm), but impoverished in Cr (<62ppm), Ni (<57ppm) and Zn (<83ppm). Petrogenetic indices and discriminant plots of Na 2 O + K 2 O vs SiO 2 , Ga vs Y, Zr/Y vs Zr, Cr vs Ni, Fe 2 O 3 -Na 2 O + K 2 O -MgO, indicated tholeiitic basalt affinity of the amphibolites and emplacements of the precursor basaltic rocks within continental crust.Most of these investigations on the amphibolites occurrences within the Precambrian basement complex of southwestern Nigeria tend to emphasize their field relations, petrological descriptions, mineralogical attributes and chemical compositions. Various efforts to unravel the petrogenetic affinity have been dogged with controversy. Therefore, this present investigation largely seeks to generate chemical data to unravel the nature and origin of the amphibolites around Wonu-Apomu in the Iseyin-Oyan schist belt and those of Ilesa in the Ife-Ilesa schist belt, southwestern Nigeria.

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Section: Resultssupporting

confidence: 58%

Section: Resultsmentioning

confidence: 99%

Nature and Origin of the Amphibolites in the Precambrian Basement Complex of Iseyin and Ilesha Schist Belts, Southwestern Nigeria

Bolarinwa¹,

Adeleye²

2015

JGG

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“…The SiO 2 content ranges from 45.02 to 52.07%, which is comparable to those of Alawa massive amphibolites (Elueze, 1985), Holleindalen greenstone (Elliot & Cowan, 1966) and the Achaean metabasalt of superior province, Canada (Glikson, 1977). Average Al 2 O 3 value of 10.53% is lower than those of Tegina amphibolites (Elueze 1981), Alawa amphibolites and Egbe massive amphibolite (Elueze, 1985), but comparable to that of the Archean metabasalt of Superior province Canada (Glikson, 1977) (Table 3).…”

Section: Major Elementsmentioning

confidence: 72%

“…Average Al 2 O 3 value of 10.53% is lower than those of Tegina amphibolites (Elueze 1981), Alawa amphibolites and Egbe massive amphibolite (Elueze, 1985), but comparable to that of the Archean metabasalt of Superior province Canada (Glikson, 1977) (Table 3). The mean composition of MgO (8.30%) for the Ifewara amphibolites is comparable to the Tegina Amphibolite, and Egbe and Ilesha massive amphibolites (Elueze, 1981) (Table 3).…”

Section: Major Elementsmentioning

confidence: 99%

Geochemical Characteristics and Tectonic Setting of Amphibolites in Ifewara Area, Ife-Ilesha Schist Belt, Southwestern Nigeria

Bolarinwa¹,

Adepoju²

2016

ESR

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Trace and Rare Earth Elements (REEs) data are used to constrain the geochemical evolution of the amphibolites from Ifewara in the Ife-Ilesha schist belt of southwestern Nigeria. The amphibolites can be grouped into banded and sheared amphibolites. Major element data show SiO 2 (48.34%), Fe 2 O 3 (11.03-17.88%), MgO (5.76-9.90%), CaO (7.76-18.6%) and TiO 2 (0.44-1.77%) contents which are similar to amphibolites in other schist belts in Nigeria. The Al 2 O 3 (2.85-15.55%) content is varied, with the higher values suggesting alkali basalt protolith. Trace and rare earth elements composition reveal Sr (160-1077ppm), Rb (0.5-22.9ppm), Ni (4.7-10.2ppm), Co (12.2-50.9 ppm) and Cr (2-7ppm). Chondrite-normalized REE patterns show that the banded amphibolites have HREE depletion and both negative and positive Eu anomalies while the sheared variety showed slight LREE enrichment with no apparent Eu anomaly. The study amphibolites plot in the Mid Oceanic Ridge Basalts (MORB) and within plate basalt fields on the Zr/Y vs Zr discriminatory diagrams. They are further classified as volcanic arc basalt and E-type MORB on the Th-Hf/3-Ta and the Zr-Nb-Y diagrams. The amphibolites precursor is considered a tholeiitic suite that suffered crustal contamination, during emplacement in a rifted crust.

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“…More importantly, the tantalum and niobium contained in this specialty metals are used for heat and corrosion resistant steels and alloys applied in space ships and gas turbines (Okunlola, 1998;Adekoya et al, 2003;Garba, 2003;Okunlola and Ogedengbe, 2003;Akintola, 2004;Okunlola and Jimba, 2006;Okunlola and Somorin, 2005; Okunlola and Akintola, 2007;Okunlola and Akintola, 2008). classified the metallogeny of the rare metal Ta-Nb pegmatites of Nigeria, outlining 7 broad fields namely Kabba -Isanlu, ljero -Aramoko, Keffi- Elueze (1985).…”

Section: Introductionmentioning

confidence: 99%

Compositional features of precambrian pegmatites of Ago-Iwoye area South Western, Nigeria

Akintola¹,

Ikhane²,

Okunlola³

et al. 2012

J. Ecol. Nat. Environ.

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The increase in global demand for rare metal Ta-Nb deposits has caused a resurgence of interest in the search for economically viable deposits. Precambrian pegmatites occurring as near vertical dykes have been studied, with the aim of determining their compositional features and possible economic values. Four thin sections were prepared from the pegmatites of the study area for petrographic study. A total of twenty five samples comprising whole rock pegmatites and extracts of mica were analyzed for major and trace elements using inductively coupled plasma-atomic emission spectrometry analytical technique (ICP-AES). Petrographic study shows that quartz, microcline, plagioclase are the main mineral constituents under transmitted light. From the results, the whole rock pegmatite is considerably siliceous, but with noticeable depletion of silica in the mica extract. Average Fe 2 O 3 , Mgo, Mno, and TiO 2 values are low in all samples (< 2.00%). The samples are fairly enriched in Rb, Sr, Zr, but comparatively, poor in the rare metals Ta, Nb, W, Cs and Sn. Rare metal mineralization enrichment indices mainly, Ta vs Nb, Ta vs K/Cs, plots, show its depletion in rare metal mineralization, suggesting Ago-Iwoye pegmatites to be barren in rare-metal mineralization when compared with other rare-metal pegmatites across the world.

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Petrochemical and Petrogenetic characteristics of precambrian amphibolites of the Alawa district, northwest Nigeria

Cited by 9 publications

References 17 publications

Nature and Origin of the Amphibolites in the Precambrian Basement Complex of Iseyin and Ilesha Schist Belts, Southwestern Nigeria

Nature and Origin of the Amphibolites in the Precambrian Basement Complex of Iseyin and Ilesha Schist Belts, Southwestern Nigeria

Geochemical Characteristics and Tectonic Setting of Amphibolites in Ifewara Area, Ife-Ilesha Schist Belt, Southwestern Nigeria

Compositional features of precambrian pegmatites of Ago-Iwoye area South Western, Nigeria

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