中国鄂尔多斯盆地准格尔煤田富铝镓煤中镓的出现模式:从 LA-ICP-MS 数据中获得的启示

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Geology Pub Date : 2023-12-29 DOI:10.1016/j.coal.2023.104436
Bo Jiu , Zhijun Jin , Zhaoguo Wang , Runchao Liu , Qitu Hu
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引用次数: 0

摘要

由于镓的供应问题,富含铝镓的煤层中镓的出现模式一直备受关注。然而,煤中镓的出现模式主要采用间接方法进行研究,这可能会造成不确定性。本研究采用激光烧蚀电感耦合等离子体质谱(LA-ICP-MS)定点和绘图分析方法,直接表征了高岭石和沸石等寄主矿物中镓的浓度,并研究了华北鄂尔多斯盆地准格尔煤田海尔乌素煤矿石炭纪富铝镓煤中有机质中镓的分布。除了岩相学和矿物学研究之外,还进行了显微镜观察和扫描电子显微镜-能量色散光谱分析。结果表明,所选矿物中 Ga 的浓度各不相同,从高到低依次为:胶体沸石(90.38 ppm)、低铝(Al2O3/SiO2)碎屑高岭石(84.67 ppm)、高铝碎屑高岭石(55.49 ppm)、含钠高岭石(49.94 ppm)、细粒玻镁石(47.13 ppm)、高铝隐晶高岭石(40.25 ppm)、低铝隐晶高岭石(38.78 ppm)、低铝蛭石高岭石(29.67 ppm)、高铝蛭石高岭石(28.37 ppm)、含 K 高岭石(19.44 ppm)以及碎屑玻镁石和细胞填充高岭石(低于检测限)。LA-ICP-MS 图谱显示,一定比例的镓可能与有机物质有关,主要集中在玻璃石中。值得注意的是,与全岩煤和侵蚀源泥岩样本相比,碎屑高岭石和胶体玻镁石中的镓浓度要高得多,这表明它们是镓的主要寄主矿物。相反,由原生高岭石转化而来的含 K 或 Na 高岭石中的镓浓度远低于碎屑高岭石中的镓浓度,而由高岭石转化而来的细粒玻镁石中的镓浓度则超过了相应高岭石层的镓浓度。这些发现表明,镓可能在粘土矿物的演化或蚀变过程中发生了迁移。
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Modes of occurrence of gallium in Al-Ga-rich coals in the Jungar Coalfield, Ordos Basin, China: Insights from LA-ICP-MS data

Owing to the concern about supply of Ga, it has been attracted much attention for the modes of occurrence of Ga in Al-Ga-rich coal-hosted deposits. However, the modes of occurrence of Ga in coal were mainly investigated using indirect methods, which may cause uncertainties. In this study, laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) spot and mapping analysis were used to directly characterize the concentration of Ga within the host minerals including kaolinite and boehmite, and to investigate the distribution of Ga in organic matter in the Carboniferous Al-Ga-rich coal from the Haerwusu Mine in the Jungar Coalfield of the Ordos Basin, North China. Microscope observation and scanning electron microscope - energy dispersive spectrometry (SEM-EDS) analysis were performed, along with petrographical and mineralogical investigations. Eight types of kaolinite and three types of boehmite particles from coal, erosional-sourced mudstone, and tonstein were identified, classified, and selected for the determination of in-situ elemental compositions.

The results showed that the concentration of Ga in the selected minerals varies, with the following order from highest to lowest: colloidal boehmite (90.38 ppm), low-Al (Al2O3/SiO2) clastic kaolinite (84.67 ppm), high-Al clastic kaolinite (55.49 ppm), Na-bearing kaolinite (49.94 ppm), fine-grained boehmite (47.13 ppm), high-Al cryptocrystalline kaolinite (40.25 ppm), low-Al cryptocrystalline kaolinite (38.78 ppm), and low-Al vermicular kaolinite (29.67 ppm), high-Al vermicular kaolinite (28.37 ppm), K-bearing kaolinite (19.44 ppm), and clastic boehmite and cell-filling kaolinite (below detection limit). LA-ICP-MS mapping demonstrated that a certain proportion of Ga could be associated with organic matter, concentrating on vitrinite. Notably, the concentration of Ga in clastic kaolinite and colloidal boehmite was found to be substantially higher compared to the whole-rock coal and erosional-sourced mudstone samples, indicative of their dominant host minerals for Ga. Conversely, the concentration of Ga in K-bearing or Na-bearing kaolinite which had experienced transformation from primary kaolinite is much lower than that in clastic kaolinite, while the concentration of Ga in fine-grained boehmite, which had altered from kaolinite, surpassed that of its corresponding kaolinite layer. These findings suggest that gallium could have undergone migration during the evolution or alteration of clay minerals.

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来源期刊
International Journal of Coal Geology
International Journal of Coal Geology 工程技术-地球科学综合
CiteScore
11.00
自引率
14.30%
发文量
145
审稿时长
38 days
期刊介绍: The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.
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