Abstract
This study aims to thoroughly examine the distribution, concentration, and occurrence of a broad selection of REEs and major elements in coal samples from Samaleswari coal block, IB valley, Odisha, India using advanced geochemical tools. A total of 85 coal samples from four boreholes were characterized using proximate analysis and calorific value measurements. The corresponding ash samples were examined using X-ray Diffraction (XRD), X-ray Fluorescence (XRF), Electron Probe Microanalyzer (EPMA), and Inductively Coupled Plasma Mass Spectrometry (ICP-MS).The coal ash samples were delineated to be rich in SiO2 (42–65%) along with a lower proportion of Al2O3 (24–41%), Fe2O3 (5–6%), and TiO2 (1–2%). The average concentration of REEs in the four boreholes was found to be 510 ppm, with the distribution pattern being Ce > La > Nd > Y > Pr > Sc > Sm > Gd > Dy > Er > Yb > Eu > Ho > Tb > Tm > Lu. The concentration of critical REEs varied in the range of 100–300 ppm, and outlook coefficient (Coutl) ranged from 0.7 to 1.0, demonstrating our coal seams' suitability as a promising source of REEs. A higher concentration of REEs in BH1 was correlated with a relatively higher proportion of apatite. The increment in REE concentration with depth was speculated to be due to their close association with hematite, especially in BH1 and BH2. A strong positive correlation of all the REEs with clay minerals and specifically TiO2 reinstates their abundance in fine-grained clastic sedimentary rocks which are not significantly affected by weathering. Point analysis using EPMA and Scanning Electron Microscope–Energy Dispersive Analysis X-ray (SEM–EDAX) confirmed the co-existence of La, Ce, Pr, and Nd in the Fe-containing aluminosilicate matrix. In addition, the major oxide ratio and their plot entail terrestrial depositional environment in the basin during coal formation and deposited in semi-arid climatic conditions.
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Acknowledgements
The authors would like to extend their gratitude to Director, CSIR-NML for allowing them to carry out and publish this work. We would like to thank CMPDIL (Coal India Ltd.) for the coal samples.
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This study was funded by National Metallurgical Laboratory.
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1. SK: Conceptualization, Data curation, Formal analysis, Writing – original draft 2. TR: Review & editing, Formal analysis 3. SC: Writing – original draft, review & editing, Formal analysis, Interpretation 4. AK: Manuscript writing, review & editing in the original draft, illustrations, Interpretation 4. MA: Formal analysis, Review & edit the original draft 5. AM: Review & edit the original draft, Formal analysis 6. RK: Review & edit the original draft, Formal analysis 7. SC: Project administration, Investigation, Supervision. Conceptualization.
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Kumari, S., Roy, T., Chakladar, S. et al. Distribution, mode of occurrence, and significance of rare-earth elements in coal from Samaleswari open cast coal blocks, Odisha, India with their provenance and paleodepositional environment. Environ Earth Sci 82, 130 (2023). https://doi.org/10.1007/s12665-023-10777-7
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DOI: https://doi.org/10.1007/s12665-023-10777-7