Geochemical Features And Rare - Metal (Ta-Nb) Potentials Of Precambrian Pegmatites Of Sepeteri Area, South Western Nigeria

Okunlola, OA; Akintola, AI

doi:10.4314/ijs.v9i2.32250

Cited by 8 publications

(15 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The deposits are paragenetically associated with three stages of Contemp.Trends.Geosci.,7(2),2018,166-187 DOI: 10.2478/ctg-2018. Triangular Ti-Sn-(Nb+Ta) plots for some pegmatite deposits in southwestern Nigeria (a) Ago Iwoye , (b) Awo , (c) Igbeti (Okunlola and Oyedokun, 2009), (d) Ijero (Akinola, 2014), (e) Komu , (f) Oke-Asa (Okunlola and Akinola, 2010), (g) Oro (Oyebamiji, 2014), and (h) Sepeteri (Okunlola and Akintola, 2007). The peak of the contours indicates the relationship between Ti-Sn-Nb+Ta which occur within the samples analyzed in each deposit.…”

Section: Resultsmentioning

confidence: 99%

“…The Sepeteri pegmatite mainly strikes in the NNE-SSW direction with an average dip of Contemp.Trends.Geosci.,7(2),2018,166-187 DOI: 10.2478/ctg-2018 60 0 E intruding into older lithology of amphibole schist. The mineral assemblages of the amphibole schist include quartz, plagioclase, microcline, biotite and hornblende with a minor amount of zircon, apatite and sphene (Okunlola and Akintola, 2007). The coarse pegmatite appears as inequigranular veins and mineralogically consist of graphic quartz, microline, albite, muscovite and lesser amount of biotite.…”

Section: Sepeteri Depositmentioning

confidence: 99%

“…The rare-metal pegmatites of the southwestern Nigeria are mostly known to host minerals such as columbite, tantalite, tin, niobium, beryl and gemstones. Several authors (Okunlola and Akintola, 2007;Okunlola and Oyedokun, 2009;Okunlola and Akinola, 2010) have worked on the whole-rock geochemistry of drill core samples, muscovite extracts, alluvial soils around the emplacement (Oyebamiji, 2014) and lepidolite samples (Akinola, 2014). The results are summarized in (Table 1).…”

Section: Geochemistrymentioning

confidence: 99%

“…Total alkali versus silica diagram for all analysed whole rock samples from southwestern Nigeria. Ago Iwoye , Apomu , Awo , Igbeti (Okunlola and Oyedokun, 2009), Ijero (Akinola, 2014), Komu , Oke-Asa (Okunlola and Akinola, 2010), Oro (Oyebamiji, 2014), and Sepeteri (Okunlola and Akintola, 2007). Contemp.Trends.Geosci.,7(2),2018,166-187 DOI: 10.2478/ctg-2018 Fig .4.…”

Section: Geochemistrymentioning

confidence: 99%

“…It indicates a granitic trend typically of strong differentiated granites with Rb enrichment, lesser Ba enrichment and low Sr contents for the whole rock analysis of samples. Ago Iwoye , Awo , Igbeti (Okunlola and Oyedokun, 2009), Ijero (Akinola, 2014), Komu , Oke-Asa (Okunlola and Akinola, 2010), Oro (Oyebamiji, 2014), and Sepeteri (Okunlola and Akintola, 2007). .Trends.Geosci.,7(2),2018,166-187 DOI: 10.2478/ctg-2018.…”

Section: Tectonic Settingmentioning

confidence: 99%

See 4 more Smart Citations

Petrogenetic and Compositional Features of Rare Metal Pan-African Post-Collisional Pegmatites of Southwestern Nigeria; A Status Review

Oyebamiji¹,

Adewumi²,

Zafar³

et al. 2018

Contemporary Trends in Geoscience

View full text Add to dashboard Cite

This research reviews the geology, petrogenesis, compositional trends and geochronology of the rare-metal pegmatite of southwestern Nigeria. The source of these pegmatites is still presently debated which have been explained as either product of highly fractionated molten material or anatexis of the local crust. However, published works of past authors have been compiled to give a detailed understanding of the formation of the mineral deposits. The basement complex of southwestern Nigeria comprises of Precambrian rocks of amphibolite, the hornblende gneiss and the granite gneisses which were formed as a result of the opening and closing of the ensialic basin with significant, extensive subduction during the Pan-African orogeny. The pegmatites in this region have shown internal zoning and a high degree of evolution from the border zone to the core zone during the crystallization and solidification of the felsic granite to pegmatite melt. The rare-metal pegmatites have distinct chemical compositions and mineralogy, containing quartz, biotite, muscovite, microcline, garnet with localized tourmaline, tantalite and columbite. These pegmatites vary significantly by their bulk-rock and mineral chemistry which indicates a more peraluminous attribute and enrichments of lithophile elements of Rb, Cs, Ta and Ba. Previous K/Ar isotopic ages (502.8±13.0 Ma and 514.5±13.2 Ma) suggest that the pegmatites are related to the post-collisional phase of intensive metasomatism. Adopted from previous studies, a five-stage conceptual model of evolution which is widely accepted have been proposed for the origin of the pegmatites.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Sepeteri Depositmentioning

confidence: 99%

Section: Geochemistrymentioning

confidence: 99%

Section: Geochemistrymentioning

confidence: 99%

Section: Tectonic Settingmentioning

confidence: 99%

See 3 more Smart Citations

Petrogenetic and Compositional Features of Rare Metal Pan-African Post-Collisional Pegmatites of Southwestern Nigeria; A Status Review

Oyebamiji¹,

Adewumi²,

Zafar³

et al. 2018

Contemporary Trends in Geoscience

View full text Add to dashboard Cite

show abstract

Geochemistry and mineral chemistry of quartz mica schists within Iseyin-Oyan Schist Belt, Southwestern Nigeria

Abdus-Salam¹

2020

IJST

View full text Add to dashboard Cite

Background/Objectives: The Iseyin-Oyan schist belt is made up metasedimentary rocks, gneisses, granites and pegmatite intrusions. The study was aimed at identifying the schist within this belt and assess their metamorphism, geochemical characteristics and tectonic origin. Methods: Detailed geologic field mapping was undertaken where rocks were located, studied in-situ and identified. Samples of the schist were prepared for petrographic studies. Mineralogical contents were determined using X-Ray Diffraction technique. Polished sections were studied for mineral chemistry using Scanning Electron Microscope-Energy Dispersive Spectroscopy. Rock samples were analysed using X-Ray Fluorescence Spectroscopy and Inductively Coupled Plasma Emission Spectrometry. Geochemical data were elucidated using diverse geochemical discrimination diagrams. Findings: The schists are quartz mica schists and occur in close association with amphibolites, intrusive granitoids and pegmatites. The Mineral assemblage indicates upper (at the western part) to lower (at the central part) amphibolite facies grade metamorphism in the area. Pyrope-almandine garnets occur in quartz mica schist at the western parts reinforcing higher pressure-temperature metamorphic conditions. The concentration (in %) of SiO2 ranged from 56.4-71.6; Al2O3, 13.7-21.1; Fe2O3, 2-8; MgO, 0.7-2.4; and K2O, 2.1-5.5 supporting the evidence for differential degrees of metamorphism. Large iron lithophile and high field strength elements are similar to the average upper continental crust. Pronounced negative Europium anomaly pointed to the major roles played by feldspars during the geological processes. Plagioclase ranged from albite-oligoclase and oligoclase- andesine. The precursors of the quartz mica schist are possibly arkosic and greywacke sands deposited within the active continental margins. Evidence of uplift and overturning suggested for the differential metamorphism may be due to these events usually associated with active continental margins. Applications: This study has identified the once named undifferentiated schist in the study area to be quartz mica schist with details in their grades of metamorphism elucidated. Keywords: Quartz mica schist; geochemistry; mineral chemistry; Iseyin-Oyan schist belt; precambrian basement complex

show abstract

Geochemistry, classification characteristics and mineralization potential of Pegmatites from Oke Ode, Kwara-State, Northeastern, Nigeria: implications for provenance and weathering history

Mafimisebi¹

2023

Preprint

View full text Add to dashboard Cite

Geochemical analysis of eight (8) representative pegmatite samples reveals high silica (SiO2) 56-62.05 wt % and alumina (Al2O3) 6.80-8.39 wt % contents. The alumina (Al2O3) is greater than the alkali Na2O + K2O +CaO in all the rock samples by values ranging between 0.79 and 1.25wt % implying that the rocks are peraluminous. MgO (0.00-0.00wt%), CaO (1.65-1.86wt %) and Fe2O3 (2.89-3.86 wt %) have low contents. Paleo-weathering plot reveals a moderate humid climatic condition and the mean values of CIA (45.15), CIW (81.00), PIA (11.32) and indicates low to high chemical weathering in the source area. Rocks that are characterized by low Mg, Ca, and Fe as well as low ratio of Na2O/K2O are termed “fertile” and peraluminous. A plot of Al2O3/ (CaO + Na2O + K2O) versus Al2O3/Na2O + K2O shows and confirms the peraluminous character of the pegmatite from Oke-Ode. Rocks that are fertile and peraluminous are rich in albite (NaAlSi3O8), potassium feldspar (KAlSi3O8) and quartz (SiO2). The abundance of feldspar and mica are geochemical indicators for Sn-Ta mineralization. The plotting of samples in both the tholeiitic and calc-alkaline fields shows that the magma from which the pegmatite was formed was not totally restricted in occurrence only to subduction-related environment but also from the oceanic crust of calc-alkaline environments. The trace elements such as of As, Mo, Rb and Zn with an average of 5.33ppm, 28.00ppm, 145.22ppm, and 24.89ppm, respectively shows that they are above the abundance level in common rocks. This indicates that the As, Mo, Rb, and Zn are abundant in all the samples of the study area.

show abstract

Geochemical Features And Rare - Metal (Ta-Nb) Potentials Of Precambrian Pegmatites Of Sepeteri Area, South Western Nigeria

Cited by 8 publications

References 0 publications

Petrogenetic and Compositional Features of Rare Metal Pan-African Post-Collisional Pegmatites of Southwestern Nigeria; A Status Review

Petrogenetic and Compositional Features of Rare Metal Pan-African Post-Collisional Pegmatites of Southwestern Nigeria; A Status Review

Geochemistry and mineral chemistry of quartz mica schists within Iseyin-Oyan Schist Belt, Southwestern Nigeria

Geochemistry, classification characteristics and mineralization potential of Pegmatites from Oke Ode, Kwara-State, Northeastern, Nigeria: implications for provenance and weathering history

Contact Info

Product

Resources

About