Rare Earth Elements Assessment in the Granitoids of Part of Southwestern Nigeria

Omotunde, Victoria B.; Olatunji, Akinade S.; Abdus-Salam, Maryam

doi:10.24018/ejgeo.2020.1.5.79

Cited by 3 publications

References 15 publications

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Assessment of Rare Earth elements in Asejire Lake, Nigeria

Adeboye,

Omotoso,

Afolabi

et al. 2024

Preprint

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This study evaluated the distribution of rare earth elements (REEs) in the Asejire Reservoir, Southwest Nigeria, a region lacking comprehensive REE assessment despite the growing concern over REE contamination due to industrial and technological advancements. Using inductively coupled plasma-mass spectrometry (ICP-MS), we analyzed 12 water samples to determine their REE concentrations. The total REE (∑REE) concentrations ranged from 10.35 to 13.44 µg/L. Cerium (Ce/Ce*), Europium (Eu/Eu*) and Gadolinium (Gd/Gd*) anomalies were 0.19–0.24, 0.18–0.24 and 0.94–1.23, respectively, indicating strong negative anomalies for Ce/Ce* and Eu/Eu*, while Gd/Gd* showed a slight positive anomaly. These results suggest that the water in the study area is relatively pristine with respect to REEs. The enrichment factor (EF) analysis showed slight enrichment/contamination (1 ≤ EF < 2) for light REEs (LREEs) and middle REEs (MREEs), while heavy REEs (HREEs) mostly showed no enrichment (EF < 1). Notably, most samples had Lanthanum (La) and Cerium (Ce) concentrations above the indicative admissible drinking water concentration (iAC = 2.0 µg/L), implying potential adverse effects from ingestion. Principal component analysis (PCA) revealed that 71.2% of the variability is accounted for by the first two principal components (PC): PC1 (61.22%) is attributed to natural inputs of REEs, while PC2 (10.51%) suggests some anthropogenic input. In conclusion, this study reveals that the Asejire Reservoir is slightly impacted by anthropogenic influences and local authorities should implement appropriate measures to prevent further deterioration.

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Assessment of Rare Earth elements in Asejire Lake, Nigeria

Adeboye,

Omotoso,

Afolabi

et al. 2024

Preprint

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Rare Earth Element Geochemistry and Abundances in Syenites and Charnockitic Rocks of Selected Locations within Southwestern Nigeria

Okunlola

Ajibola

Olisa

2022

Materials and Geoenvironment

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Rare earth elements (REE) are critical metals widely used in modern technology. There is an increased demand for these elements which has necessitated additional exploration. The REE geochemistry of syenites and charnockitic rocks from selected locations within southwestern Nigeria were studied to determine their concentrations, distribution patterns, and mineralisation potential to deduce if they can be economically exploited. Mineralogical studies were carried out using scanning electron microscopy (SEM). Ten rock samples including five syenites and five charnockites were analysed for their elemental composition using inductively coupled plasma – mass spectrometry (ICP-MS). The REE-bearing minerals identified from the SEM analysis include apatite and monazite. The fractionation ratio (La/Yb)N ranged from 29.36 to 48.75 for the syenites and from 24.43 to 48.29 for the charnockites, indicating magmatic differentiation. Total REE (∑REE) in the syenites (342–675 ppm) and charnockites (220–802 ppm) suggests that they are enriched with respect to REE but the REE concentration in the rocks of the study area had very low ∑REE compared to the REE contents of the rocks where they have been mined and may therefore not be economically viable.

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Geology and Rare Earth Element Geochemistry of Magnesian Granitoids Within Proterozoic Schist Belt of Southwest Nigeria

Okunola

Olatunji

Afolabi

2023

Materials and Geoenvironment

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The increased global demand for and price of rare earth elements (REEs) has led to intensive search for them in rocks of the upper continental crust all over the world. This study is aimed at characterising the granitoids at Okeho within Southwestern Nigeria using geochemical data and assessing their potential for REE enrichment. Ten representative rock samples of the Proterozoic intrusives, syenite and granodiorite, were studied for their mineralogical and elemental compositions. Elemental concentrations were analysed using Inductively Coupled Plasma Mass Spectrometry (ICP-MS). Average major oxide concentrations revealed SiO2 (57.53 wt. %), Al2O3 (13.25 wt. %), CaO (5.05 wt. %), and MgO (5.59 wt. %) for the syenite and SiO2 (62.39 wt. %), Al2O3 (14.98 wt. %), CaO (3.67 wt. %), and MgO (3.25 wt. %) for the granodiorite. Total Alkali–Silica (TAS), Aluminum Saturation Index (ASI), and La/10-Y/15-Nb/8 plots discriminated the granitoids as metaluminous monzonite-syenite and peraluminous diorite-granodiorite. Average total REE concentrations in the syenite (625.06 ppm) and porphyritic-granodiorite (364.51 ppm) were above values reported for the granites in some mines in Jiangxi Province, Southern China.

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Rare Earth Elements Assessment in the Granitoids of Part of Southwestern Nigeria

Cited by 3 publications

References 15 publications

Assessment of Rare Earth elements in Asejire Lake, Nigeria

Assessment of Rare Earth elements in Asejire Lake, Nigeria

Rare Earth Element Geochemistry and Abundances in Syenites and Charnockitic Rocks of Selected Locations within Southwestern Nigeria

Geology and Rare Earth Element Geochemistry of Magnesian Granitoids Within Proterozoic Schist Belt of Southwest Nigeria

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