Significant enrichment of Rb and Cs in the Late Triassic coals from the Coc Sau surface mine, Cam Pha Coalfield, Quang Ninh Province, Vietnam
The current study investigates the mineralogical and geochemical characteristics of the Late Triassic coals from the Coc Sau open-pit mine, Cam Pha Coalfield (Quang Ninh Province, Northeastern Vietnam) using Powder X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), inductively coupled plasma atomic-emission spectrometry (ICP-AES) and inductively coupled plasma mass spectrometry (ICP-MS). Coals from Coc Sau open-pit mine are characterized by medium ash yield (avg. 29.7%), low sulfur content (avg. 0.17%), and low moisture content (avg. 1.8%). The volatile matter content (avg. 8.4%) indicates a semianthracite rank. The crystalline phases identified in Coc Sau coals and host rocks (roof, floor, parting) are primarily quartz, kaolinite and muscovite, with small proportions of ankerite, clinochlore, anatase, calcite, and tobelite. Illite, pyrite, and siderite were occasionally detected in individual samples. In addition, several minerals below the XRD detection limit, such as barite, apatite, zircon, xenotime, and florencite were observed by SEM. The low sulfur concentrations, low Sr/Ba ratio and relatively high ash yield of these coals indicate a continental lake basin sedimentary environment with a relatively strong supply of terrigenous detritus. Quartz, kaolinite, and muscovite were most likely derived from the terrigenous source region surrounding the basin, and the other minerals are mainly of authigenic origin. Relative to worldwide coals, the Coc Sau coals and host rocks are highly enriched in Rb and Cs, which can be a potential source for Rb and Cs recovery during coal utilization and combustion. Rubidium and Cs enriched in the coals are positively correlated with Al and K, indicating that they most likely occur in potassium-rich clay minerals (e.g., muscovite), and originate from weathered felsic terrigenous detritus.
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Elsevier
2022-03-01
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Subjects: | Cam Pha Coalfield, Coal geochemistry, Late Triassic coals, Minerals in coal, Rb and Cs enrichment in coal, |
Online Access: | http://hdl.handle.net/10261/259527 https://api.elsevier.com/content/abstract/scopus_id/85122838612 |
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dig-idaea-es-10261-2595272024-05-15T20:52:44Z Significant enrichment of Rb and Cs in the Late Triassic coals from the Coc Sau surface mine, Cam Pha Coalfield, Quang Ninh Province, Vietnam Nguyen, Xuanphu Li, Jing Zhuang, Xinguo Li, Baoqing Querol, Xavier Moreno, Natalia Córdoba, Patricia Cam Pha Coalfield Coal geochemistry Late Triassic coals Minerals in coal Rb and Cs enrichment in coal The current study investigates the mineralogical and geochemical characteristics of the Late Triassic coals from the Coc Sau open-pit mine, Cam Pha Coalfield (Quang Ninh Province, Northeastern Vietnam) using Powder X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), inductively coupled plasma atomic-emission spectrometry (ICP-AES) and inductively coupled plasma mass spectrometry (ICP-MS). Coals from Coc Sau open-pit mine are characterized by medium ash yield (avg. 29.7%), low sulfur content (avg. 0.17%), and low moisture content (avg. 1.8%). The volatile matter content (avg. 8.4%) indicates a semianthracite rank. The crystalline phases identified in Coc Sau coals and host rocks (roof, floor, parting) are primarily quartz, kaolinite and muscovite, with small proportions of ankerite, clinochlore, anatase, calcite, and tobelite. Illite, pyrite, and siderite were occasionally detected in individual samples. In addition, several minerals below the XRD detection limit, such as barite, apatite, zircon, xenotime, and florencite were observed by SEM. The low sulfur concentrations, low Sr/Ba ratio and relatively high ash yield of these coals indicate a continental lake basin sedimentary environment with a relatively strong supply of terrigenous detritus. Quartz, kaolinite, and muscovite were most likely derived from the terrigenous source region surrounding the basin, and the other minerals are mainly of authigenic origin. Relative to worldwide coals, the Coc Sau coals and host rocks are highly enriched in Rb and Cs, which can be a potential source for Rb and Cs recovery during coal utilization and combustion. Rubidium and Cs enriched in the coals are positively correlated with Al and K, indicating that they most likely occur in potassium-rich clay minerals (e.g., muscovite), and originate from weathered felsic terrigenous detritus. The authors appreciate the reviewers for their useful comments and suggestions to improve the quality of the manuscript. Peer reviewed 2022-02-02T09:46:37Z 2022-02-02T09:46:37Z 2022-03-01 artículo http://purl.org/coar/resource_type/c_6501 Ore Geology Reviews 142: 104700 (2022) 01691368 http://hdl.handle.net/10261/259527 10.1016/j.oregeorev.2022.104700 2-s2.0-85122838612 https://api.elsevier.com/content/abstract/scopus_id/85122838612 en Ore Geology Reviews Publisher's version https://doi.org/10.1016/j.oregeorev.2022.104700 Sí open Elsevier |
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Cam Pha Coalfield Coal geochemistry Late Triassic coals Minerals in coal Rb and Cs enrichment in coal Cam Pha Coalfield Coal geochemistry Late Triassic coals Minerals in coal Rb and Cs enrichment in coal |
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Cam Pha Coalfield Coal geochemistry Late Triassic coals Minerals in coal Rb and Cs enrichment in coal Cam Pha Coalfield Coal geochemistry Late Triassic coals Minerals in coal Rb and Cs enrichment in coal Nguyen, Xuanphu Li, Jing Zhuang, Xinguo Li, Baoqing Querol, Xavier Moreno, Natalia Córdoba, Patricia Significant enrichment of Rb and Cs in the Late Triassic coals from the Coc Sau surface mine, Cam Pha Coalfield, Quang Ninh Province, Vietnam |
description |
The current study investigates the mineralogical and geochemical characteristics of the Late Triassic coals from the Coc Sau open-pit mine, Cam Pha Coalfield (Quang Ninh Province, Northeastern Vietnam) using Powder X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), inductively coupled plasma atomic-emission spectrometry (ICP-AES) and inductively coupled plasma mass spectrometry (ICP-MS). Coals from Coc Sau open-pit mine are characterized by medium ash yield (avg. 29.7%), low sulfur content (avg. 0.17%), and low moisture content (avg. 1.8%). The volatile matter content (avg. 8.4%) indicates a semianthracite rank. The crystalline phases identified in Coc Sau coals and host rocks (roof, floor, parting) are primarily quartz, kaolinite and muscovite, with small proportions of ankerite, clinochlore, anatase, calcite, and tobelite. Illite, pyrite, and siderite were occasionally detected in individual samples. In addition, several minerals below the XRD detection limit, such as barite, apatite, zircon, xenotime, and florencite were observed by SEM. The low sulfur concentrations, low Sr/Ba ratio and relatively high ash yield of these coals indicate a continental lake basin sedimentary environment with a relatively strong supply of terrigenous detritus. Quartz, kaolinite, and muscovite were most likely derived from the terrigenous source region surrounding the basin, and the other minerals are mainly of authigenic origin. Relative to worldwide coals, the Coc Sau coals and host rocks are highly enriched in Rb and Cs, which can be a potential source for Rb and Cs recovery during coal utilization and combustion. Rubidium and Cs enriched in the coals are positively correlated with Al and K, indicating that they most likely occur in potassium-rich clay minerals (e.g., muscovite), and originate from weathered felsic terrigenous detritus. |
format |
artículo |
topic_facet |
Cam Pha Coalfield Coal geochemistry Late Triassic coals Minerals in coal Rb and Cs enrichment in coal |
author |
Nguyen, Xuanphu Li, Jing Zhuang, Xinguo Li, Baoqing Querol, Xavier Moreno, Natalia Córdoba, Patricia |
author_facet |
Nguyen, Xuanphu Li, Jing Zhuang, Xinguo Li, Baoqing Querol, Xavier Moreno, Natalia Córdoba, Patricia |
author_sort |
Nguyen, Xuanphu |
title |
Significant enrichment of Rb and Cs in the Late Triassic coals from the Coc Sau surface mine, Cam Pha Coalfield, Quang Ninh Province, Vietnam |
title_short |
Significant enrichment of Rb and Cs in the Late Triassic coals from the Coc Sau surface mine, Cam Pha Coalfield, Quang Ninh Province, Vietnam |
title_full |
Significant enrichment of Rb and Cs in the Late Triassic coals from the Coc Sau surface mine, Cam Pha Coalfield, Quang Ninh Province, Vietnam |
title_fullStr |
Significant enrichment of Rb and Cs in the Late Triassic coals from the Coc Sau surface mine, Cam Pha Coalfield, Quang Ninh Province, Vietnam |
title_full_unstemmed |
Significant enrichment of Rb and Cs in the Late Triassic coals from the Coc Sau surface mine, Cam Pha Coalfield, Quang Ninh Province, Vietnam |
title_sort |
significant enrichment of rb and cs in the late triassic coals from the coc sau surface mine, cam pha coalfield, quang ninh province, vietnam |
publisher |
Elsevier |
publishDate |
2022-03-01 |
url |
http://hdl.handle.net/10261/259527 https://api.elsevier.com/content/abstract/scopus_id/85122838612 |
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