Geochemistry, mineralogy and thermal analyses of Cretaceous coals from the Benue Trough basin Nigeria: Reconnaissance assessments
Selected coal samples from the Benue Trough Basin (Nigeria) were analysed by X-ray photoelectron spectroscopy (XPS), X-ray fluorescence (XRF), laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS), Fourier transform-infrared spectroscopy (FT-IR), and all the techniques used. The mai...
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my.utm.978532022-11-07T09:58:11Z http://eprints.utm.my/id/eprint/97853/ Geochemistry, mineralogy and thermal analyses of Cretaceous coals from the Benue Trough basin Nigeria: Reconnaissance assessments Akinyemi, Segun A. Nyakuma, Bemgba B. Adebayo, Olajide F. Kayode, Ayobami T. Jauro, Aliyu OlaOlorun, Olusola A. Aturamu, Adeyinka O. Madukwe, Henry Y. Adegoke, Adebanji K. Tuan Abdullah, Tuan Amran Gitari, Wilson M. Mudzielwana, Rabelani Rabha, Shahadev Saikia, Binoy K. Hower, James C. TP Chemical technology Selected coal samples from the Benue Trough Basin (Nigeria) were analysed by X-ray photoelectron spectroscopy (XPS), X-ray fluorescence (XRF), laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS), Fourier transform-infrared spectroscopy (FT-IR), and all the techniques used. The main minerals detected are clays (e.g., kaolinite and illite), quartz, feldspar, hematite and magnetite with traces of calcite, siderite, dolomite, orthoclase and graphite. The authigenic and detrital origins of the clay minerals detected were confirmed by FT-IR analysis. The XPS spectra identified elements similar to the mineral phases observed in the XRD spectra. The contents of Al2O3, CaO, Fe2O3, K2O, Na2O and P2O5 were below the values reported for US and Chinese coals. The elemental indexes (e.g. Al2O3/TiO2, Co/Th vs. La/Sc, Cr/Th vs. Sc/Th) showed that the influence of intermediate-mafic materials derived from source-region sediments is negligible. The Ni/Co ratio showed that the coal forming marsh experienced comparatively mild redox conditions. The ratios of V/(V + Ni), Co/Ni, and Mo/Ni revealed marginal or non-existent marine effects. Trace metals ratios such as V/Ni, Sr/Ba, Rb/Sr, Sr/Cu and V/Zn showed evidence of a large degree of freshwater environment mainly in a humid climate. Maceral composition reflects fluctuations of dry and wet conditions in the forest swamp in a humid environment with an entry of marginal marine system and good plant tissue preservation. The rare earth elements (REE) in the coal samples studied are characterized by light-REE enrichment. Thermal decomposition resulted in the range of residual mass (RM = 33.67%–61.28%) and mass losses (ML = 38.72% - 66.33%), which attributed to the drying, devolatilization, and coke formation. Thermal reactivity followed the sample order A-5 > A-1 > A-6, which indicates A-5 is more thermally reactive. The results indicate that the coal samples could be exploited for electric power generation. Elsevier Ltd 2021 Article PeerReviewed Akinyemi, Segun A. and Nyakuma, Bemgba B. and Adebayo, Olajide F. and Kayode, Ayobami T. and Jauro, Aliyu and OlaOlorun, Olusola A. and Aturamu, Adeyinka O. and Madukwe, Henry Y. and Adegoke, Adebanji K. and Tuan Abdullah, Tuan Amran and Gitari, Wilson M. and Mudzielwana, Rabelani and Rabha, Shahadev and Saikia, Binoy K. and Hower, James C. (2021) Geochemistry, mineralogy and thermal analyses of Cretaceous coals from the Benue Trough basin Nigeria: Reconnaissance assessments. Journal of African Earth Sciences, 178 (NA). pp. 1-12. ISSN 1464-343X http://dx.doi.org/10.1016/j.jafrearsci.2021.104167 DOI : 10.1016/j.jafrearsci.2021.104167 |
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TP Chemical technology Akinyemi, Segun A. Nyakuma, Bemgba B. Adebayo, Olajide F. Kayode, Ayobami T. Jauro, Aliyu OlaOlorun, Olusola A. Aturamu, Adeyinka O. Madukwe, Henry Y. Adegoke, Adebanji K. Tuan Abdullah, Tuan Amran Gitari, Wilson M. Mudzielwana, Rabelani Rabha, Shahadev Saikia, Binoy K. Hower, James C. Geochemistry, mineralogy and thermal analyses of Cretaceous coals from the Benue Trough basin Nigeria: Reconnaissance assessments |
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Selected coal samples from the Benue Trough Basin (Nigeria) were analysed by X-ray photoelectron spectroscopy (XPS), X-ray fluorescence (XRF), laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS), Fourier transform-infrared spectroscopy (FT-IR), and all the techniques used. The main minerals detected are clays (e.g., kaolinite and illite), quartz, feldspar, hematite and magnetite with traces of calcite, siderite, dolomite, orthoclase and graphite. The authigenic and detrital origins of the clay minerals detected were confirmed by FT-IR analysis. The XPS spectra identified elements similar to the mineral phases observed in the XRD spectra. The contents of Al2O3, CaO, Fe2O3, K2O, Na2O and P2O5 were below the values reported for US and Chinese coals. The elemental indexes (e.g. Al2O3/TiO2, Co/Th vs. La/Sc, Cr/Th vs. Sc/Th) showed that the influence of intermediate-mafic materials derived from source-region sediments is negligible. The Ni/Co ratio showed that the coal forming marsh experienced comparatively mild redox conditions. The ratios of V/(V + Ni), Co/Ni, and Mo/Ni revealed marginal or non-existent marine effects. Trace metals ratios such as V/Ni, Sr/Ba, Rb/Sr, Sr/Cu and V/Zn showed evidence of a large degree of freshwater environment mainly in a humid climate. Maceral composition reflects fluctuations of dry and wet conditions in the forest swamp in a humid environment with an entry of marginal marine system and good plant tissue preservation. The rare earth elements (REE) in the coal samples studied are characterized by light-REE enrichment. Thermal decomposition resulted in the range of residual mass (RM = 33.67%–61.28%) and mass losses (ML = 38.72% - 66.33%), which attributed to the drying, devolatilization, and coke formation. Thermal reactivity followed the sample order A-5 > A-1 > A-6, which indicates A-5 is more thermally reactive. The results indicate that the coal samples could be exploited for electric power generation. |
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Article |
author |
Akinyemi, Segun A. Nyakuma, Bemgba B. Adebayo, Olajide F. Kayode, Ayobami T. Jauro, Aliyu OlaOlorun, Olusola A. Aturamu, Adeyinka O. Madukwe, Henry Y. Adegoke, Adebanji K. Tuan Abdullah, Tuan Amran Gitari, Wilson M. Mudzielwana, Rabelani Rabha, Shahadev Saikia, Binoy K. Hower, James C. |
author_facet |
Akinyemi, Segun A. Nyakuma, Bemgba B. Adebayo, Olajide F. Kayode, Ayobami T. Jauro, Aliyu OlaOlorun, Olusola A. Aturamu, Adeyinka O. Madukwe, Henry Y. Adegoke, Adebanji K. Tuan Abdullah, Tuan Amran Gitari, Wilson M. Mudzielwana, Rabelani Rabha, Shahadev Saikia, Binoy K. Hower, James C. |
author_sort |
Akinyemi, Segun A. |
title |
Geochemistry, mineralogy and thermal analyses of Cretaceous coals from the Benue Trough basin Nigeria: Reconnaissance assessments |
title_short |
Geochemistry, mineralogy and thermal analyses of Cretaceous coals from the Benue Trough basin Nigeria: Reconnaissance assessments |
title_full |
Geochemistry, mineralogy and thermal analyses of Cretaceous coals from the Benue Trough basin Nigeria: Reconnaissance assessments |
title_fullStr |
Geochemistry, mineralogy and thermal analyses of Cretaceous coals from the Benue Trough basin Nigeria: Reconnaissance assessments |
title_full_unstemmed |
Geochemistry, mineralogy and thermal analyses of Cretaceous coals from the Benue Trough basin Nigeria: Reconnaissance assessments |
title_sort |
geochemistry, mineralogy and thermal analyses of cretaceous coals from the benue trough basin nigeria: reconnaissance assessments |
publisher |
Elsevier Ltd |
publishDate |
2021 |
url |
http://eprints.utm.my/id/eprint/97853/ http://dx.doi.org/10.1016/j.jafrearsci.2021.104167 |
_version_ |
1751536112724082688 |